"pelzflorian (Florian Pelz)" <pelzflorian@HIDDEN>
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Full text available.Received: (at 48907) by debbugs.gnu.org; 30 May 2024 02:39:03 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Wed May 29 22:39:03 2024 Received: from localhost ([127.0.0.1]:40403 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1sCVh1-0002RE-1E for submit <at> debbugs.gnu.org; Wed, 29 May 2024 22:39:03 -0400 Received: from mail-108-mta198.mxroute.com ([136.175.108.198]:46725) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <richard@HIDDEN>) id 1sCVgy-0002Qn-Ur for 48907 <at> debbugs.gnu.org; Wed, 29 May 2024 22:39:02 -0400 Received: from filter006.mxroute.com ([136.175.111.3] filter006.mxroute.com) (Authenticated sender: mN4UYu2MZsgR) by mail-108-mta198.mxroute.com (ZoneMTA) with ESMTPSA id 18fc75d433b000efce.001 for <48907 <at> debbugs.gnu.org> (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384); Thu, 30 May 2024 02:38:49 +0000 X-Zone-Loop: 816f07e5cebe6bf08ed5d36219fd9ee8e45bdb427e5c X-Originating-IP: [136.175.111.3] DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=freakingpenguin.com; s=x; h=Content-Type:MIME-Version:Message-ID:Date:CC: Subject:To:From:Sender:Reply-To:Content-Transfer-Encoding:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe: List-Subscribe:List-Post:List-Owner:List-Archive; bh=2KeHevkksxaZXZaOsd2bSQi8DqU4riXNNqR1IK7fTPA=; b=TmWTgvm3xa14FTCDbc7ICW5pxJ TM8YHfGzOMyyaXsq+hmzhUPDXX7AG8Me9x4AuzgqHZx2oBD+OrihQ2oe3GPaP2vfhJWSLZH0X1X7I ts7/Bgd7tHRikBPpF1/RmT9MHc5PoxifBKrexRwbEPa3EDSDm5c2XVIdmgtpXDKDL0rc/nQL5Dte0 HGPWeVKXNrMLTF9TK29t/h2S/6fJPicZdwdrWP8Aqyv/Wa3ds+SUUF7Ge4aDChzzdGa+Vul9aKscw 7R5nqHe0SsQj31ug+sYbZ3RNge7A2xaPvBeD55znWO7kt6zfCRIytu0nlf7IVfon84MRBc4r8Tpk8 eWdnMnJA==; From: Richard Sent <richard@HIDDEN> To: 48907 <at> debbugs.gnu.org Subject: Other possibly related issues Date: Wed, 29 May 2024 22:38:40 -0400 Message-ID: <87sey081n3.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain X-Authenticated-Id: richard@HIDDEN X-Spam-Score: 0.0 (/) X-Debbugs-Envelope-To: 48907 Cc: ludo@HIDDEN, pelzflorian@HIDDEN, maxim.cournoyer@HIDDEN X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -1.0 (-) Hi all, I believe https://issues.guix.gnu.org/62890 is another example of this problem. Possibly https://issues.guix.gnu.org/47115#23 as well. One idea I had was to somehow graft each output as a unique derivation via repeated calls to graft-derivation. From what I've seen so far though that looks much easier said than done. It hasn't progressed beyond the "huh, I wonder" phase. Funny, I just started investigating the grafting code myself to see if I could understand what's going on and I stumble upon this 3 year old issue just an hour after Maxim comments. -- Take it easy, Richard Sent Making my computer weirder one commit at a time.
bug-guix@HIDDEN:bug#48907; Package guix.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: "pelzflorian (Florian Pelz)" <pelzflorian@HIDDEN>
Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file
names (debug symbols missing in GDB).
In-Reply-To: <871q6r9qsg.fsf@HIDDEN>
(pelzflorian@HIDDEN's message of "Sat, 27 Apr 2024 10:02:39
+0200")
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Hi Florian,
"pelzflorian (Florian Pelz)" <pelzflorian@HIDDEN> writes:
> Hello all.
>
> Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>>>> I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119.
>>>> It=E2=80=99s often not very helpful anyway (we often find ourselves do=
wnloading
>>>> unnecessary package outputs because of grafting).
>>>
>>> Hmm. Perhaps. But it'd also suck to have to download 1 GiB of unneeded
>>> debugging symbols to just apply a graft to Qt, for example.
>>
>> Yeah. That=E2=80=99s already the case in some cases though, that=E2=80=
=99s what I
>> meant.
>
> I believe I got bitten by this 482fda2729c3e76999892cb8f9a0391a7bd37119
> too, not only for debug symbols, which annoys me, and not like the Go
> users, but for me the issue surfaced when trying to use guile-g-golf,
> whose hello-world.scm errors out with =E2=80=9Ccannot register existing t=
ype
> 'GdkPixbuf'=E2=80=9D and GDB debugging shows (I think) it is because a va=
riant
> of gdk-pixbuf without a debug output is used by Gtk while guile-g-golf
> loads gdk-pixbuf with debug output before. `guix shell --no-grafts` is
> a workaround.
I'm guessing bug #64836 ("pygobject GTK modules lookup fails following
CUPS graft") may be another manifestation of this problem.
--=20
Thanks,
Maxim
bug-guix@HIDDEN:bug#48907; Package guix.
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From: "pelzflorian (Florian Pelz)" <pelzflorian@HIDDEN>
To: 48907 <at> debbugs.gnu.org
Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file
names (debug symbols missing in GDB).
In-Reply-To: <8735phq6dy.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Mon, 04 Oct 2021 15:14:17 +0200")
Date: Sat, 27 Apr 2024 10:02:39 +0200
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Hello all.
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
>>> I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119.
>>> It=E2=80=99s often not very helpful anyway (we often find ourselves dow=
nloading
>>> unnecessary package outputs because of grafting).
>>
>> Hmm. Perhaps. But it'd also suck to have to download 1 GiB of unneeded
>> debugging symbols to just apply a graft to Qt, for example.
>
> Yeah. That=E2=80=99s already the case in some cases though, that=E2=80=
=99s what I
> meant.
I believe I got bitten by this 482fda2729c3e76999892cb8f9a0391a7bd37119
too, not only for debug symbols, which annoys me, and not like the Go
users, but for me the issue surfaced when trying to use guile-g-golf,
whose hello-world.scm errors out with =E2=80=9Ccannot register existing type
'GdkPixbuf'=E2=80=9D and GDB debugging shows (I think) it is because a vari=
ant
of gdk-pixbuf without a debug output is used by Gtk while guile-g-golf
loads gdk-pixbuf with debug output before. `guix shell --no-grafts` is
a workaround.
Perhaps guile-gi have the same issue. Quoting
<https://github.com/spk121/guile-gi/issues/96>:
> It is pretty clear to me, that the main culprit here is a different
> version of GLib being linked to Guile-GI than the one that should be
> loaded through Guile-GI.
In essence it seems to me 482fda2729c3e76999892cb8f9a0391a7bd37119 is
implemented at the wrong level. It changed the grafting derivation and
thus the hash, when it could probably be done in guix-daemon directly.
Is it better to wait with fixing this until the guix-daemon is rewritten
in Guile? And use `--no-grafts' in the meantime?
Regards,
Florian
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.Received: (at 48907) by debbugs.gnu.org; 4 Oct 2021 13:14:27 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Mon Oct 04 09:14:27 2021 Received: from localhost ([127.0.0.1]:35924 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1mXNnX-0002vy-HO for submit <at> debbugs.gnu.org; Mon, 04 Oct 2021 09:14:27 -0400 Received: from eggs.gnu.org ([209.51.188.92]:53382) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1mXNnU-0002vj-Vn for 48907 <at> debbugs.gnu.org; Mon, 04 Oct 2021 09:14:26 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:52912) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mXNnP-0007LC-NV; Mon, 04 Oct 2021 09:14:19 -0400 Received: from [2001:660:6102:320:e120:2c8f:8909:cdfe] (port=60542 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mXNnP-0002oM-9j; Mon, 04 Oct 2021 09:14:19 -0400 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Maxim Cournoyer <maxim.cournoyer@HIDDEN> Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file names (debug symbols missing in GDB). In-Reply-To: <87v92lh1wc.fsf@HIDDEN> (Maxim Cournoyer's message of "Mon, 27 Sep 2021 22:25:39 -0400") References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN> <87ilyqk8jg.fsf_-_@HIDDEN> <87lf3mm560.fsf@HIDDEN> <87v92lh1wc.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 7 =?utf-8?Q?Vend=C3=A9miaire?= an 230 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Mon, 04 Oct 2021 15:14:17 +0200 Message-ID: <8735phq6dy.fsf@HIDDEN> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 48907 Cc: 48907 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi, Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis: > Ludovic Court=C3=A8s <ludo@HIDDEN> writes: > > [...] > >>> Yikes! This means that debugging with grafts (with the aid of debugging >>> symbols) is no longer possible, right? >> >> It depends on whether the separate =E2=80=9Cdebug=E2=80=9D output gets g= rafted or not, >> but yeah, if a dependency tree has this shape (app -> lib + lib:debug), >> running =E2=80=98guix install app=E2=80=99 alone will prevent you from g= etting debugging >> symbols from =E2=80=98lib:debug=E2=80=99 I believe. That sucks. >> >> I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119. >> It=E2=80=99s often not very helpful anyway (we often find ourselves down= loading >> unnecessary package outputs because of grafting). > > Hmm. Perhaps. But it'd also suck to have to download 1 GiB of unneeded > debugging symbols to just apply a graft to Qt, for example. Yeah. That=E2=80=99s already the case in some cases though, that=E2=80=99s= what I meant. >>> I remember reading about a 2nd option to locate the separate debug >>> symbol files with GDB in info '(gdb) Separate Debug Files': >>> >>> >>> * The executable contains a "build ID", a unique bit string that is >> >> We=E2=80=99d have to check if this is applicable. Looking at the ld man= ual >> (info "(ld) Options"), it seems that the UUID =E2=80=9Cstyle=E2=80=9D is= ruled out >> because it=E2=80=99s non-deterministic, and the md5 and sha1 styles would >> require us to rewrite build IDs IIUC, similar to how we rewrite CRCs. > > Seems like it could work? simark from #gdb says it should be > deterministic for reproducible builds. We'd need to fixup the grafted > debug output, but they could being done in a separate derivation would > no longer matter (as the debug symbols would be matched on a unique ID > that is not linked to that derivation, not on their file name, which > is). > > Did I get the above right? To summarize, =E2=80=98.gnu_debuglink=E2=80=99 in executables/libraries con= tains the CRC of the debug file. Conversely, IIUC what the =E2=80=9Cnormative parts of the output contents= =E2=80=9D (info "(ld) Options") really are, build IDs are computed on the code, not on debug info. But the problems remains the same I think: if you have /gnu/store/abc=E2=80=A6/libfoo.so and /gnu/store/xyz=E2=80=A6/libfoo.so, ch= ances are that they are different due to embedded store file names, and thus get a different build ID. Am I right? (BTW, I just noticed build IDs were also discussed at <https://issues.guix.gnu.org/25752>.) Ludo=E2=80=99.
bug-guix@HIDDEN:bug#48907; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file
names (debug symbols missing in GDB).
References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN>
<87ilyqk8jg.fsf_-_@HIDDEN> <87lf3mm560.fsf@HIDDEN>
<87v92lh1wc.fsf@HIDDEN> <877df1f2zk.fsf@HIDDEN>
Date: Tue, 28 Sep 2021 12:28:39 +0200
In-Reply-To: <877df1f2zk.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Tue, 28 Sep 2021 11:45:03 +0200")
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Ludovic Court=C3=A8s <ludo@HIDDEN> skribis:
> Conversely, IIUC what the =E2=80=9Cnormative parts of the output contents=
=E2=80=9D (info
> "(ld) Options") really are, build IDs are computed on the code, not on
> debug info.
>
> But the problems remains the same I think: if you have
> /gnu/store/abc=E2=80=A6/libfoo.so and /gnu/store/xyz=E2=80=A6/libfoo.so, =
chances are
> that they are different due to embedded store file names, and thus get a
> different build ID.
We discussed this with Mark Wielaard on #guix=C2=B9, and one important
takeaway is:
--8<---------------cut here---------------start------------->8---
<civodul> so gdb just checks that the separate debug file has the same
build-id as the code, right? [12:16]
<civodul> it doesn't matter whether it really is the sha1 of all those
sections, does it?
<mjw> that is kind of the whole point of the build-id, that it captures the
whole build environment, not just the generated code, but also how it
was generated (which is what the .debug sections kind of represent)
<civodul> ok [12:17]
<mjw> civodul, no, it doesn't need to be a hash over the actual bits
produced. It can be a completely different hash, it can be a different
number of bits (but not too short, they need to be globally unique).
<civodul> ok, so we could have our own way of caculating build IDs [12:18]
<mjw> civodul, all that really matters is that it uniquely identifies this
binary blob. If any input, source, compiler, flags, etc. changes, it
should be unique.
--8<---------------cut here---------------end--------------->8---
So I suspect that we would not need to rewrite build IDs upon grafting,
and we could use the ungrafted debug info with grafted code and vice
versa.
We should try it out to test the hypothesis, but if that works, that=E2=80=
=99d
be great.
Ludo=E2=80=99.
=C2=B9 https://logs.guix.gnu.org/guix/2021-09-28.log#114610
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.Received: (at 48907) by debbugs.gnu.org; 28 Sep 2021 09:45:42 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Tue Sep 28 05:45:42 2021 Received: from localhost ([127.0.0.1]:43889 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1mV9gE-0007MX-E6 for submit <at> debbugs.gnu.org; Tue, 28 Sep 2021 05:45:42 -0400 Received: from eggs.gnu.org ([209.51.188.92]:44812) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1mV9gD-0007ML-3M for 48907 <at> debbugs.gnu.org; Tue, 28 Sep 2021 05:45:41 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:35974) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mV9g5-0006gh-GM; Tue, 28 Sep 2021 05:45:34 -0400 Received: from [2001:660:6102:320:e120:2c8f:8909:cdfe] (port=60470 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mV9fe-00051v-BD; Tue, 28 Sep 2021 05:45:24 -0400 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Maxim Cournoyer <maxim.cournoyer@HIDDEN> Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file names (debug symbols missing in GDB). References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN> <87ilyqk8jg.fsf_-_@HIDDEN> <87lf3mm560.fsf@HIDDEN> <87v92lh1wc.fsf@HIDDEN> X-URL: http://www.fdn.fr/~lcourtes/ X-Revolutionary-Date: 7 =?utf-8?Q?Vend=C3=A9miaire?= an 230 de la =?utf-8?Q?R=C3=A9volution?= X-PGP-Key-ID: 0x090B11993D9AEBB5 X-PGP-Key: http://www.fdn.fr/~lcourtes/ludovic.asc X-PGP-Fingerprint: 3CE4 6455 8A84 FDC6 9DB4 0CFB 090B 1199 3D9A EBB5 X-OS: x86_64-pc-linux-gnu Date: Tue, 28 Sep 2021 11:45:03 +0200 In-Reply-To: <87v92lh1wc.fsf@HIDDEN> (Maxim Cournoyer's message of "Mon, 27 Sep 2021 22:25:39 -0400") Message-ID: <877df1f2zk.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 48907 Cc: 48907 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi, Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis: > Ludovic Court=C3=A8s <ludo@HIDDEN> writes: > > [...] > >>> Yikes! This means that debugging with grafts (with the aid of debugging >>> symbols) is no longer possible, right? >> >> It depends on whether the separate =E2=80=9Cdebug=E2=80=9D output gets g= rafted or not, >> but yeah, if a dependency tree has this shape (app -> lib + lib:debug), >> running =E2=80=98guix install app=E2=80=99 alone will prevent you from g= etting debugging >> symbols from =E2=80=98lib:debug=E2=80=99 I believe. That sucks. >> >> I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119. >> It=E2=80=99s often not very helpful anyway (we often find ourselves down= loading >> unnecessary package outputs because of grafting). > > Hmm. Perhaps. But it'd also suck to have to download 1 GiB of unneeded > debugging symbols to just apply a graft to Qt, for example. Yeah. That=E2=80=99s already the case in some cases though, that=E2=80=99s= what I meant. >>> I remember reading about a 2nd option to locate the separate debug >>> symbol files with GDB in info '(gdb) Separate Debug Files': >>> >>> >>> * The executable contains a "build ID", a unique bit string that is >> >> We=E2=80=99d have to check if this is applicable. Looking at the ld man= ual >> (info "(ld) Options"), it seems that the UUID =E2=80=9Cstyle=E2=80=9D is= ruled out >> because it=E2=80=99s non-deterministic, and the md5 and sha1 styles would >> require us to rewrite build IDs IIUC, similar to how we rewrite CRCs. > > Seems like it could work? simark from #gdb says it should be > deterministic for reproducible builds. We'd need to fixup the grafted > debug output, but they could being done in a separate derivation would > no longer matter (as the debug symbols would be matched on a unique ID > that is not linked to that derivation, not on their file name, which > is). > > Did I get the above right? To summarize, =E2=80=98.gnu_debuglink=E2=80=99 in executables/libraries con= tains the CRC of the debug file. Conversely, IIUC what the =E2=80=9Cnormative parts of the output contents= =E2=80=9D (info "(ld) Options") really are, build IDs are computed on the code, not on debug info. But the problems remains the same I think: if you have /gnu/store/abc=E2=80=A6/libfoo.so and /gnu/store/xyz=E2=80=A6/libfoo.so, ch= ances are that they are different due to embedded store file names, and thus get a different build ID. Am I right? (BTW, I just noticed build IDs were also discussed at <https://issues.guix.gnu.org/25752>.) Ludo=E2=80=99.
bug-guix@HIDDEN:bug#48907; Package guix.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file
names (debug symbols missing in GDB).
References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN>
<87ilyqk8jg.fsf_-_@HIDDEN> <87lf3mm560.fsf@HIDDEN>
Date: Mon, 27 Sep 2021 22:25:39 -0400
In-Reply-To: <87lf3mm560.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Fri, 24 Sep 2021 16:14:47 +0200")
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Heya,
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
[...]
>> Yikes! This means that debugging with grafts (with the aid of debugging
>> symbols) is no longer possible, right?
>
> It depends on whether the separate =E2=80=9Cdebug=E2=80=9D output gets gr=
afted or not,
> but yeah, if a dependency tree has this shape (app -> lib + lib:debug),
> running =E2=80=98guix install app=E2=80=99 alone will prevent you from ge=
tting debugging
> symbols from =E2=80=98lib:debug=E2=80=99 I believe. That sucks.
>
> I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119.
> It=E2=80=99s often not very helpful anyway (we often find ourselves downl=
oading
> unnecessary package outputs because of grafting).
Hmm. Perhaps. But it'd also suck to have to download 1 GiB of unneeded
debugging symbols to just apply a graft to Qt, for example.
>> I remember reading about a 2nd option to locate the separate debug
>> symbol files with GDB in info '(gdb) Separate Debug Files':
>>
>>
>> * The executable contains a "build ID", a unique bit string that is
>
> We=E2=80=99d have to check if this is applicable. Looking at the ld manu=
al
> (info "(ld) Options"), it seems that the UUID =E2=80=9Cstyle=E2=80=9D is =
ruled out
> because it=E2=80=99s non-deterministic, and the md5 and sha1 styles would
> require us to rewrite build IDs IIUC, similar to how we rewrite CRCs.
Seems like it could work? simark from #gdb says it should be
deterministic for reproducible builds. We'd need to fixup the grafted
debug output, but they could being done in a separate derivation would
no longer matter (as the debug symbols would be matched on a unique ID
that is not linked to that derivation, not on their file name, which
is).
Did I get the above right?
Thanks,
Maxim
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.Received: (at 48907) by debbugs.gnu.org; 24 Sep 2021 14:14:57 +0000 From debbugs-submit-bounces <at> debbugs.gnu.org Fri Sep 24 10:14:57 2021 Received: from localhost ([127.0.0.1]:58975 helo=debbugs.gnu.org) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <debbugs-submit-bounces <at> debbugs.gnu.org>) id 1mTlyb-0006yS-52 for submit <at> debbugs.gnu.org; Fri, 24 Sep 2021 10:14:57 -0400 Received: from eggs.gnu.org ([209.51.188.92]:50096) by debbugs.gnu.org with esmtp (Exim 4.84_2) (envelope-from <ludo@HIDDEN>) id 1mTlyZ-0006yD-9q for 48907 <at> debbugs.gnu.org; Fri, 24 Sep 2021 10:14:55 -0400 Received: from fencepost.gnu.org ([2001:470:142:3::e]:54734) by eggs.gnu.org with esmtp (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mTlyU-0000Yl-5D; Fri, 24 Sep 2021 10:14:50 -0400 Received: from [2001:660:6102:320:e120:2c8f:8909:cdfe] (port=60464 helo=ribbon) by fencepost.gnu.org with esmtpsa (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <ludo@HIDDEN>) id 1mTlyT-0004i7-Sv; Fri, 24 Sep 2021 10:14:50 -0400 From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN> To: Maxim Cournoyer <maxim.cournoyer@HIDDEN> Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file names (debug symbols missing in GDB). References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN> <87ilyqk8jg.fsf_-_@HIDDEN> Date: Fri, 24 Sep 2021 16:14:47 +0200 In-Reply-To: <87ilyqk8jg.fsf_-_@HIDDEN> (Maxim Cournoyer's message of "Thu, 23 Sep 2021 22:32:35 -0400") Message-ID: <87lf3mm560.fsf@HIDDEN> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.2 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Spam-Score: -2.3 (--) X-Debbugs-Envelope-To: 48907 Cc: 48907 <at> debbugs.gnu.org X-BeenThere: debbugs-submit <at> debbugs.gnu.org X-Mailman-Version: 2.1.18 Precedence: list List-Id: <debbugs-submit.debbugs.gnu.org> List-Unsubscribe: <https://debbugs.gnu.org/cgi-bin/mailman/options/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=unsubscribe> List-Archive: <https://debbugs.gnu.org/cgi-bin/mailman/private/debbugs-submit/> List-Post: <mailto:debbugs-submit <at> debbugs.gnu.org> List-Help: <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=help> List-Subscribe: <https://debbugs.gnu.org/cgi-bin/mailman/listinfo/debbugs-submit>, <mailto:debbugs-submit-request <at> debbugs.gnu.org?subject=subscribe> Errors-To: debbugs-submit-bounces <at> debbugs.gnu.org Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org> X-Spam-Score: -3.3 (---) Hi, Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis: > Ludovic Court=C3=A8s <ludo@HIDDEN> writes: [...] >> This is due to the fact that, when you run =E2=80=98guix build jami-qt= =E2=80=99, the >> grafting derivation dismisses the =E2=80=9Cdebug=E2=80=9D output of qtde= clarative, since >> jami-qt does not depend on it. That way it doesn=E2=80=99t have to >> build/download and graft qtdeclarative:debug. [...] > Yikes! This means that debugging with grafts (with the aid of debugging > symbols) is no longer possible, right? It depends on whether the separate =E2=80=9Cdebug=E2=80=9D output gets graf= ted or not, but yeah, if a dependency tree has this shape (app -> lib + lib:debug), running =E2=80=98guix install app=E2=80=99 alone will prevent you from gett= ing debugging symbols from =E2=80=98lib:debug=E2=80=99 I believe. That sucks. I wonder if we should revert 482fda2729c3e76999892cb8f9a0391a7bd37119. It=E2=80=99s often not very helpful anyway (we often find ourselves downloa= ding unnecessary package outputs because of grafting). > I remember reading about a 2nd option to locate the separate debug > symbol files with GDB in info '(gdb) Separate Debug Files': > > > * The executable contains a "build ID", a unique bit string that is We=E2=80=99d have to check if this is applicable. Looking at the ld manual (info "(ld) Options"), it seems that the UUID =E2=80=9Cstyle=E2=80=9D is ru= led out because it=E2=80=99s non-deterministic, and the md5 and sha1 styles would require us to rewrite build IDs IIUC, similar to how we rewrite CRCs. Thanks, Ludo=E2=80=99.
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.Ludovic Courtès <ludo@HIDDEN>
to control <at> debbugs.gnu.org.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: Ludovic =?utf-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Subject: Re: bug#48907: Grafts cause discrepancies in debug symbols file
names (debug symbols missing in GDB).
References: <87r1hdtu4t.fsf@HIDDEN> <87eeczikq5.fsf@HIDDEN>
Date: Thu, 23 Sep 2021 22:32:35 -0400
In-Reply-To: <87eeczikq5.fsf@HIDDEN> ("Ludovic =?utf-8?Q?Court=C3=A8s=22'?=
=?utf-8?Q?s?= message of "Fri, 18 Jun 2021 11:29:54 +0200")
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Hi!
Ludovic Court=C3=A8s <ludo@HIDDEN> writes:
> Hi,
>
> Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:
>
>> $ guix build qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
>> substitute: updating substitutes from 'http://127.0.0.1:8080'... 100.0%
>> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
>> The following files will be downloaded:
>> /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug
>> /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2
>> substituting /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5=
.15.2-debug...
>> downloading from https://ci.guix.gnu.org/nar/lzip/g1gxfbkyxilnx7s6mjdlj6=
97y5n5wazn-qtdeclarative-5.15.2-debug ...
>> qtdeclarative-5.15.2-debug 94.9MiB 1.2MiB/s=
01:21 [##################] 100.0%
>>
>> The following graft will be made:
>> /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
>> applying 2 grafts for /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdecl=
arative-5.15.2.drv ...
>> grafting '/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15=
.2-debug' -> '/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.1=
5.2-debug'...
>> grafting '/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15=
.2' -> '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2'...
>> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6n=
wnywf-qtdeclarative-5.15.2/bin/qml'
>> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6n=
wnywf-qtdeclarative-5.15.2/bin/q
>> [...]
>> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6n=
wnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtQuick/Window.2/libwindowplugin.so'
>> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6n=
wnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtTest/libqmltestplugin.so'
>> successfully built /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclara=
tive-5.15.2.drv
>> /gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug/l=
ib/debug/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/li=
b/libQt5Qml.so.5.15.2.debug
>> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/lib=
Qt5Qml.so.5.15.2
>> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/lib=
Qt5Qml.so.5
>> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/lib=
Qt5Qml.so.5.15
>>
>>
>> So far so good. The file hierarchy under the debug output matches the
>> actual shared library file name. Next, let's verify which qtdeclarative
>> shared libraries jami-qt is dynamically linked against:
>>
>> $ guix build jami-qt | tail -1 | xargs -I{} ldd {}/bin/.jami-qt-real | g=
rep qtdeclarative
>> libQt5QuickWidgets.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2=
j0a2vccs-qtdeclarative-5.15.2/lib/libQt5QuickWidgets.so.5 (0x00007fb9e38a80=
00)
>> libQt5Quick.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vcc=
s-qtdeclarative-5.15.2/lib/libQt5Quick.so.5 (0x00007fb9dba47000)
>> libQt5QmlModels.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a=
2vccs-qtdeclarative-5.15.2/lib/libQt5QmlModels.so.5 (0x00007fb9db9c3000)
>> libQt5Qml.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-=
qtdeclarative-5.15.2/lib/libQt5Qml.so.5 (0x00007fb9dae4e000)
>
> This is due to the fact that, when you run =E2=80=98guix build jami-qt=E2=
=80=99, the
> grafting derivation dismisses the =E2=80=9Cdebug=E2=80=9D output of qtdec=
larative, since
> jami-qt does not depend on it. That way it doesn=E2=80=99t have to
> build/download and graft qtdeclarative:debug.
>
> Conversely, when you run =E2=80=98guix build qtdeclarative=E2=80=99, it g=
rafts both
> outputs of qtdeclarative. Thus, this grafting derivation is different
> from the one jami-qt.drv depends on.
>
> This behavior was implemented in commit
> 482fda2729c3e76999892cb8f9a0391a7bd37119. Not sure what a good solution
> would be.
>
> Thoughts?
Yikes! This means that debugging with grafts (with the aid of debugging
symbols) is no longer possible, right?
I remember reading about a 2nd option to locate the separate debug
symbol files with GDB in info '(gdb) Separate Debug Files':
* The executable contains a "build ID", a unique bit string that is
also present in the corresponding debug info file. (This is
supported only on some operating systems, when using the ELF or PE
file formats for binary files and the GNU Binutils.) For more
details about this feature, see the description of the '--build-id'
command-line option in *note Command Line Options: (ld)Options.
The debug info file's name is not specified explicitly by the build
ID, but can be computed from the build ID, see below.
[...]
=20=20=20
* For the "build ID" method, GDB looks in the '.build-id'
subdirectory of each one of the global debug directories for a file
named 'NN/NNNNNNNN.debug', where NN are the first 2 hex characters
of the build ID bit string, and NNNNNNNN are the rest of the bit
string. (Real build ID strings are 32 or more hex characters, not
10.)
What may help us here, compared to debug links, is that it seems to be
file name agnostic; the debug files would be matched by an internal ID
that they got at build time rather than from their file names (which
doesn't work with the current different derivations in the presence of
grafts).
Perhaps it'd also lift the need to recompute the CRC checksum of the
debug links produced when grafting!
HTH!
Maxim
bug-guix@HIDDEN:bug#48907; Package guix.
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From: =?utf-8?Q?Ludovic_Court=C3=A8s?= <ludo@HIDDEN>
To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Subject: Re: bug#48907: Debug symbols file name discrepancies
References: <87r1hdtu4t.fsf@HIDDEN>
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Hi,
Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:
> $ guix build qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
> substitute: updating substitutes from 'http://127.0.0.1:8080'... 100.0%
> substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
> The following files will be downloaded:
> /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug
> /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2
> substituting /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.=
15.2-debug...
> downloading from https://ci.guix.gnu.org/nar/lzip/g1gxfbkyxilnx7s6mjdlj69=
7y5n5wazn-qtdeclarative-5.15.2-debug ...
> qtdeclarative-5.15.2-debug 94.9MiB 1.2MiB/s =
01:21 [##################] 100.0%
>
> The following graft will be made:
> /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
> applying 2 grafts for /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdecla=
rative-5.15.2.drv ...
> grafting '/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.=
2-debug' -> '/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15=
.2-debug'...
> grafting '/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.=
2' -> '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2'...
> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nw=
nywf-qtdeclarative-5.15.2/bin/qml'
> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nw=
nywf-qtdeclarative-5.15.2/bin/q
> [...]
> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nw=
nywf-qtdeclarative-5.15.2/lib/qt5/qml/QtQuick/Window.2/libwindowplugin.so'
> updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nw=
nywf-qtdeclarative-5.15.2/lib/qt5/qml/QtTest/libqmltestplugin.so'
> successfully built /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarat=
ive-5.15.2.drv
> /gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug/li=
b/debug/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib=
/libQt5Qml.so.5.15.2.debug
> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQ=
t5Qml.so.5.15.2
> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQ=
t5Qml.so.5
> /gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQ=
t5Qml.so.5.15
>
>
> So far so good. The file hierarchy under the debug output matches the
> actual shared library file name. Next, let's verify which qtdeclarative
> shared libraries jami-qt is dynamically linked against:
>
> $ guix build jami-qt | tail -1 | xargs -I{} ldd {}/bin/.jami-qt-real | gr=
ep qtdeclarative
> libQt5QuickWidgets.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j=
0a2vccs-qtdeclarative-5.15.2/lib/libQt5QuickWidgets.so.5 (0x00007fb9e38a800=
0)
> libQt5Quick.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs=
-qtdeclarative-5.15.2/lib/libQt5Quick.so.5 (0x00007fb9dba47000)
> libQt5QmlModels.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2=
vccs-qtdeclarative-5.15.2/lib/libQt5QmlModels.so.5 (0x00007fb9db9c3000)
> libQt5Qml.so.5 =3D> /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-q=
tdeclarative-5.15.2/lib/libQt5Qml.so.5 (0x00007fb9dae4e000)
This is due to the fact that, when you run =E2=80=98guix build jami-qt=E2=
=80=99, the
grafting derivation dismisses the =E2=80=9Cdebug=E2=80=9D output of qtdecla=
rative, since
jami-qt does not depend on it. That way it doesn=E2=80=99t have to
build/download and graft qtdeclarative:debug.
Conversely, when you run =E2=80=98guix build qtdeclarative=E2=80=99, it gra=
fts both
outputs of qtdeclarative. Thus, this grafting derivation is different
from the one jami-qt.drv depends on.
This behavior was implemented in commit
482fda2729c3e76999892cb8f9a0391a7bd37119. Not sure what a good solution
would be.
Thoughts?
Ludo=E2=80=99.
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.Maxim Cournoyer <maxim.cournoyer@HIDDEN>
to control <at> debbugs.gnu.org.
Full text available.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: 48907 <at> debbugs.gnu.org
Subject: Re: bug#48907: Debug symbols file name discrepancies
References: <87r1hdtu4t.fsf@HIDDEN>
Date: Mon, 07 Jun 2021 15:26:05 -0400
In-Reply-To: <87r1hdtu4t.fsf@HIDDEN> (Maxim Cournoyer's message of "Mon, 07
Jun 2021 14:19:30 -0400")
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Hello again,
Building everything without grafts does resolve the file name
discrepancy issue, e.g.:
guix build --no-grafts qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug/lib/debug/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2.debug
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2
guix build --no-grafts jami-qt | tail -1 | xargs -I{} ldd {}/bin/.jami-qt-real | grep qtdeclarative
libQt5QuickWidgets.so.5 => /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5QuickWidgets.so.5 (0x00007f42c79b2000)
libQt5Quick.so.5 => /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Quick.so.5 (0x00007f42bfb52000)
libQt5QmlModels.so.5 => /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5QmlModels.so.5 (0x00007f42bface000)
libQt5Qml.so.5 => /gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5 (0x00007f42bef59000)
And the debug symbols are now discovered and usable by GDB. So this
issue is indeed caused by grafts.
Maxim
bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
To: bug-guix <bug-guix@HIDDEN>
Subject: Debug symbols file name discrepancies
Date: Mon, 07 Jun 2021 14:19:30 -0400
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Hello,
While attempting to debug a crash in jami-qt, I've noticed that GDB
would fail to load the symbol tables of the shared libraries it uses,
for example qtdeclarative.
It seems that grafts are to blame. Let's start by looking at the debug
files found for the qtdeclarative libQt5Qml.so.5 shared library:
--8<---------------cut here---------------start------------->8---
$ guix build qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
substitute: updating substitutes from 'http://127.0.0.1:8080'... 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
The following files will be downloaded:
/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2
substituting /gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug...
downloading from https://ci.guix.gnu.org/nar/lzip/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug ...
qtdeclarative-5.15.2-debug 94.9MiB 1.2MiB/s 01:21 [##################] 100.0%
The following graft will be made:
/gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
applying 2 grafts for /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv ...
grafting '/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug' -> '/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug'...
grafting '/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2' -> '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2'...
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/bin/qml'
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/bin/q
[...]
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtQuick/Window.2/libwindowplugin.so'
updating '.gnu_debuglink' CRC in '/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/qt5/qml/QtTest/libqmltestplugin.so'
successfully built /gnu/store/djhcai9rixm2j3jlamwdhsgwgidg7w74-qtdeclarative-5.15.2.drv
/gnu/store/l3h4ka7v3j1yhik0f1phwch08a09p0bx-qtdeclarative-5.15.2-debug/lib/debug/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2.debug
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5
/gnu/store/pryhgzb6cwnzsskqwldwc6dxr6nwnywf-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15
--8<---------------cut here---------------end--------------->8---
So far so good. The file hierarchy under the debug output matches the
actual shared library file name. Next, let's verify which qtdeclarative
shared libraries jami-qt is dynamically linked against:
--8<---------------cut here---------------start------------->8---
$ guix build jami-qt | tail -1 | xargs -I{} ldd {}/bin/.jami-qt-real | grep qtdeclarative
libQt5QuickWidgets.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5QuickWidgets.so.5 (0x00007fb9e38a8000)
libQt5Quick.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5Quick.so.5 (0x00007fb9dba47000)
libQt5QmlModels.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5QmlModels.so.5 (0x00007fb9db9c3000)
libQt5Qml.so.5 => /gnu/store/mjl02yma4r5xjark6d8pp5h2j0a2vccs-qtdeclarative-5.15.2/lib/libQt5Qml.so.5 (0x00007fb9dae4e000)
--8<---------------cut here---------------end--------------->8---
Oops! The actual store file name of the libQt5Qml.so.5 known to jami-qt
is *not* the same as the one obtained earlier, which explains why GDB
doesn't find its symbols. Without grafts, the first command gives:
--8<---------------cut here---------------start------------->8---
$ guix build --no-grafts qtdeclarative | xargs -I{} find -L {} -name *libQt5Qml.so.5*
/gnu/store/g1gxfbkyxilnx7s6mjdlj697y5n5wazn-qtdeclarative-5.15.2-debug/lib/debug/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2.debug
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15
/gnu/store/nvzvrr137qfqsn2875yrs9ilfd12wi96-qtdeclarative-5.15.2/lib/libQt5Qml.so.5.15.2
--8<---------------cut here---------------end--------------->8---
Which still doesn't match the libraries jami-qt is linked with.
I'm out of ideas for now. Would someone have a clue?
Thank you!
Maxim
Maxim Cournoyer <maxim.cournoyer@HIDDEN>:bug-guix@HIDDEN.
Full text available.bug-guix@HIDDEN:bug#48907; Package guix.
Full text available.
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