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Subject: bug#47064: DrRacket internal error uncompressing
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Hi Guix,
Using guix 80739ea480a7db667b83b45e3a08be740449f689 on x86_64, running:
`guix environment --ad-hoc racket -- drracket` produces:
```
$bytevector-uncompress: internal error uncompressing #"\0\0\0\0chez\310\224\206:\r()#\201\256R-d\205\233\24\363\5\20\201P\6A\v\300\0\16\f\6\31\2\f\6\f&H\275\0\1\0\362\bA\377e\0\1\0C\6A\21\3\v\300\0\201\265!\f\6\n\0\a\1\35\0\1+\0\360\27\201\375\300\0\0\0\17\205\210Z\0\0M\215\245\b\4\0\0M9fH\17\206fZ\0\0I\2...
context...:
body of "/gnu/store/mmrax3f1vx3c8ih9hhgffpvka6chk96w-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/gtk/utils.rkt"
body of "/gnu/store/mmrax3f1vx3c8ih9hhgffpvka6chk96w-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/platform.rkt"
```
However, `guix time-machine --commit=b1248016e0492e1897f4d1127ccb07736c9bb6a5 -- environment --ad-hoc racket -- drracket`
successfully opens drracket. b1248016e0492e1897f4d1127ccb07736c9bb6a5 is
the commit before the Racket 8.0 update, so I think the update introduced
the problem. Other Racket GUI programs like slideshow and gracket also
also exhibit the problem. The command line REPL works however.
I have not investigated to determine if the problem is specific to the GUI
packages or if loading other extra Racket packages would also exhibit the
problem.
Best,
Jack
Content-Disposition: inline Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-Mailer: MIME-tools 5.505 (Entity 5.505) Content-Type: text/plain; charset=utf-8 X-Loop: help-debbugs@HIDDEN From: help-debbugs@HIDDEN (GNU bug Tracking System) To: Jack Hill <jackhill@HIDDEN> Subject: bug#47064: Acknowledgement (DrRacket internal error uncompressing) Message-ID: <handler.47064.B.16154436852510.ack <at> debbugs.gnu.org> References: <alpine.DEB.2.21.2103110058320.8138@HIDDEN> X-Gnu-PR-Message: ack 47064 X-Gnu-PR-Package: guix Reply-To: 47064 <at> debbugs.gnu.org Date: Thu, 11 Mar 2021 06:22:02 +0000 Thank you for filing a new bug report with debbugs.gnu.org. This is an automatically generated reply to let you know your message has been received. Your message is being forwarded to the package maintainers and other interested parties for their attention; they will reply in due course. Your message has been sent to the package maintainer(s): bug-guix@HIDDEN If you wish to submit further information on this problem, please send it to 47064 <at> debbugs.gnu.org. Please do not send mail to help-debbugs@HIDDEN unless you wish to report a problem with the Bug-tracking system. --=20 47064: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D47064 GNU Bug Tracking System Contact help-debbugs@HIDDEN with problems
X-Loop: help-debbugs@HIDDEN
Subject: bug#47064: DrRacket internal error uncompressing
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I wrote to the racket-users [0] list to see if they have advice on what
could be causing this problem.
[0] https://www.mail-archive.com/racket-users@HIDDEN/msg46066.html
Best,
Jack
X-Loop: help-debbugs@HIDDEN
Subject: bug#47064: FYI: DrRacket problem
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Philip,
Thanks for the work you've been doing on improving our Racket package. I
wanted to make sure you were aware of the failure of DrRacket and other
graphical Racket components to load in the latest Racket package.
https://issues.guix.gnu.org/47064
Best,
Jack
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References: <alpine.DEB.2.21.2103150040230.8138@HIDDEN>
From: Philip McGrath <philip@HIDDEN>
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Jack, thanks for the pointer: I hadn't noticed this earlier.
On 3/15/21 12:49 AM, Jack Hill wrote:
> ```
> $bytevector-uncompress: internal error uncompressing
> #"\0\0\0\0chez\310\224\206:\r()#\201\256R-d\205\233\24\363\5\20\201P\6A\v\300\0\16\f\6\31\2\f\6\f&H\275\0\1\0\362\bA\377e\0\1\0C\6A\21\3\v\300\0\201\265!\f\6\n\0\a\1\35\0\1+\0\360\27\201\375\300\0\0\0\17\205\210Z\0\0M\215\245\b\4\0\0M9fH\17\206fZ\0\0I\2...
> context...:
> body of
> "/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/gtk/utils.rkt"
> body of
> "/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/platform.rkt"
> ```
This appears to be an error uncompressing Racket's compiled code—whether
generated by the Racket layer or the Chez Scheme layer, I'm not sure.
The stack trace is pointing to the module `mred/private/wx/gtk/utils`,
which is here:
https://github.com/racket/gui/blob/master/gui-lib/mred/private/wx/gtk/utils.rkt
At first glance, the most unusual-looking thing about that module is the
use of `(only-in '#%foreign ctype-c->scheme)` … but it could also be
something else altogether. I'll try to investigate further, but thoughts
from others would be very welcome!
-Philip
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<p>Jack, thanks for the pointer: I hadn't noticed this earlier.<br>
</p>
<div class="moz-cite-prefix">On 3/15/21 12:49 AM, Jack Hill wrote:<br>
</div>
<blockquote type="cite"
cite="mid:alpine.DEB.2.21.2103150040230.8138@HIDDEN">```
<br>
$bytevector-uncompress: internal error uncompressing
#"\0\0\0\0chez\310\224\206:\r()#\201\256R-d\205\233\24\363\5\20\201P\6A\v\300\0\16\f\6\31\2\f\6\f&H\275\0\1\0\362\bA\377e\0\1\0C\6A\21\3\v\300\0\201\265!\f\6\n\0\a\1\35\0\1+\0\360\27\201\375\300\0\0\0\17\205\210Z\0\0M\215\245\b\4\0\0M9fH\17\206fZ\0\0I\2...<br>
context...:
<br>
body of
"/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/gtk/utils.rkt"<br>
body of
"/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/platform.rkt"<br>
```
<br>
</blockquote>
<p>This appears to be an error uncompressing Racket's compiled
code—whether generated by the Racket layer or the Chez Scheme
layer, I'm not sure. The stack trace is pointing to the module
`mred/private/wx/gtk/utils`, which is here:
<a class="moz-txt-link-freetext" href="https://github.com/racket/gui/blob/master/gui-lib/mred/private/wx/gtk/utils.rkt">https://github.com/racket/gui/blob/master/gui-lib/mred/private/wx/gtk/utils.rkt</a></p>
<p>At first glance, the most unusual-looking thing about that module
is the use of `(<span class="pl-en">only-in</span> '#%foreign
ctype-c->scheme)` … but it could also be something else
altogether. I'll try to investigate further, but thoughts from
others would be very welcome!</p>
<p>-Philip<br>
</p>
</body>
</html>
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I can reproduce the error with just:
```
$ racket -l mred/private/wx/gtk/utils
$bytevector-uncompress: internal error uncompressing
#"\0\0\0\0chez\310\224\206:\r()#\201\256R-d\205\233\24\363\5\20\201P\6A\v\300\0\16\f\6\31\2\f\6\f&H\275\0\1\0\362\bA\377e\0\1\0C\6A\21\3\v\300\0\201\265!\f\6\n\0\a\1\35\0\1+\0\360\27\201\375\300\0\0\0\17\205\210Z\0\0M\215\245\b\4\0\0M9fH\17\206fZ\0\0I\2...
context...:
body of
"/gnu/store/bbnhjamch9125c412bl7ybf28a0jxrkd-racket-8.0/share/racket/pkgs/gui-lib/mred/private/wx/gtk/utils.rkt"
```
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Aha! Running:
guix environment --ad-hoc --no-grafts racket -- drracket
launches DrRacket just fine.
My guess is that Racket CS is compressing string literals in compiled
code. Currently, Guix patches Racket source files to include the
absolute paths to foreign libraries in the store as string literals.
There are a bunch of grafts for GTK and such: if I'm right, Guix somehow
mangles the compiled code while attempting to apply the grafts.
I already thought this strategy was a bad idea. If it is really the
problem, I should be able to patch it fairly quickly: I've already been
experimenting along these lines.
-Philip
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Hi,
I do not have problems with racket on a foreign distro. On guix system I
experience the same error.
Malte
On Mon, 15 Mar 2021, 22:06 Jack Hill, <jackhill@HIDDEN> wrote:
> Philip,
>
> Thanks for the work you've been doing on improving our Racket package. I
> wanted to make sure you were aware of the failure of DrRacket and other
> graphical Racket components to load in the latest Racket package.
>
> https://issues.guix.gnu.org/47064
>
> Best,
> Jack
>
>
>
>
--00000000000036af4405bd9b3b90
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<div dir=3D"auto">Hi,<div dir=3D"auto"><br></div><div dir=3D"auto">I do not=
have problems with racket on a foreign distro. On guix system I experience=
the same error.=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">M=
alte</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Mon, 15 Mar 2021, 22:06 Jack Hill, <<a href=3D"mailto:jackh=
ill@HIDDEN">jackhill@HIDDEN</a>> wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex">Philip,<br>
<br>
Thanks for the work you've been doing on improving our Racket package. =
I <br>
wanted to make sure you were aware of the failure of DrRacket and other <br=
>
graphical Racket components to load in the latest Racket package.<br>
<br>
<a href=3D"https://issues.guix.gnu.org/47064" rel=3D"noreferrer noreferrer"=
target=3D"_blank">https://issues.guix.gnu.org/47064</a><br>
<br>
Best,<br>
Jack<br>
<br>
<br>
<br>
</blockquote></div>
--00000000000036af4405bd9b3b90--
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On Mon, 15 Mar 2021, Philip McGrath wrote:
> Aha! Running:
>
> guix environment --ad-hoc --no-grafts racket -- drracket
>
> launches DrRacket just fine.
>
> My guess is that Racket CS is compressing string literals in compiled code.
> Currently, Guix patches Racket source files to include the absolute paths to
> foreign libraries in the store as string literals. There are a bunch of
> grafts for GTK and such: if I'm right, Guix somehow mangles the compiled code
> while attempting to apply the grafts.
>
> I already thought this strategy was a bad idea. If it is really the problem,
> I should be able to patch it fairly quickly: I've already been experimenting
> along these lines.
Aha, that does sound promising. This certinially wouldn't be the only
grafts corner case:
https://issues.guix.gnu.org/33848
https://issues.guix.gnu.org/30265
Thanks for taking a look,
Jack
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X-Loop: help-debbugs@HIDDEN
Subject: bug#47064: [racket-users] bytevector-uncompress: internal error uncompressing
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Hi Philip, [removed 'racket-users' from the recipient list]
Philip McGrath <philip@HIDDEN> writes:
> My guess is that Racket CS is compressing string literals in compiled
> code. Currently, Guix patches Racket source files to include the
> absolute paths to foreign libraries in the store as string literals.
> There are a bunch of grafts for GTK and such: if I'm right, Guix somehow
> mangles the compiled code while attempting to apply the grafts.
I think I know what happened here.
Recall that the grafting code performs a set of substitutions, replacing
store item names (i.e. file names in /gnu/store) with replacement store
items of the same length, with rules like:
"fx3979c88s9yxdbchyf36qryawgzpwb5-libx11-1.6.10" =>
"rwkqxykm91a75w9afhb41saj0dmf30hw-libx11-1.6.12".
The grafting code currently only checks the first 33 bytes, consisting
of the nix-base32 hash and the "-". It *assumes* that the remainder of
the associated store item name immediately follows, and blindly writes
the replacement string over whatever is there.
In this case, I suspect that within a *.zo file, a Guix store item name
was split into pieces, with the hash and "-" together in one piece but
split somewhere between the "-" and the last byte of the store item.
This results in corruption of the bytes following that piece.
I've recently observed the splitting of store item names in *.zo files
(see <https://bugs.gnu.org/47614>), but in that case the "-" was
separated from the hash, and as a result the reference was _invisible_
to the grafter.
For the record, when I originally wrote this fast(er) grafting code
(commit 5a1add373ab427a3b336981d857252e703a9f8d1), by design it only
rewrote the hashes, and so naturally it had the following desirable
property: it never overwrote any byte without first checking it against
an expected value. Later, starting in commit
57bdd79e485801ccf405ca7389bd099809fe5d67, the grafting code was modified
to allow rewriting the entire store item name (notably including the
version number). Unfortunately, although the set of overwritten bytes
was extended past the "-", the set of bytes *checked* was left
unchanged, and thus the aforementioned desirable property was lost.
I think we ought to restore that property. I'm already working on some
other changed to the grafting code (supporting UTF-16 and UTF-32 encoded
references), so I'll try to find the time to fix this problem as well.
Regards,
Mark
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From: Philip McGrath <philip@HIDDEN>
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Hi Mark and everyone,
On 4/14/21 1:54 AM, Mark H Weaver wrote:
> Recall that the grafting code performs a set of substitutions, replacing
> store item names (i.e. file names in /gnu/store) with replacement store
> items of the same length, with rules like:
> "fx3979c88s9yxdbchyf36qryawgzpwb5-libx11-1.6.10" =>
> "rwkqxykm91a75w9afhb41saj0dmf30hw-libx11-1.6.12".
>
> The grafting code currently only checks the first 33 bytes, consisting
> of the nix-base32 hash and the "-". It *assumes* that the remainder of
> the associated store item name immediately follows, and blindly writes
> the replacement string over whatever is there.
>
> In this case, I suspect that within a *.zo file, a Guix store item name
> was split into pieces, with the hash and "-" together in one piece but
> split somewhere between the "-" and the last byte of the store item.
> This results in corruption of the bytes following that piece.
>
> I've recently observed the splitting of store item names in *.zo files
> (see <https://bugs.gnu.org/47614>), but in that case the "-" was
> separated from the hash, and as a result the reference was _invisible_
> to the grafter.
Yes, I agree with this diagnosis.
It seems the discussion has become a bit fragmented, since Jack first
reported one set of symptoms in <https://issues.guix.gnu.org/47064> and
you then reported another in <https://issues.guix.gnu.org/47614> (with
much better forensics than I'd found on my own—thanks!).
Both issues should have been fixed (at least with respect to Racket) by
my patch in <https://issues.guix.gnu.org/47180>, which was applied on
Monday.
-Philip
GNU bug tracking system
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