GNU logs - #58205, boring messages

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Subject: bug#58205: reconfiguration stuck unless using '--no-grafts'
Resent-From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
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From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Date: Fri, 30 Sep 2022 17:18:18 -0400
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Hi,

While working on Berlin today from a chroot, and with --no-substitutes
used for guix-daemon, I wasn't able to complete the 'guix system
reconfigure' step; it'd hand on a read call (seen using strace):

--8<---------------cut here---------------start------------->8---
statfs("/gnu/store", {f_type=BTRFS_SUPER_MAGIC, f_bsize=4096, f_blocks=26843282944, f_bfree=14069128626, f_bavail=14067391234, f_files=0, f_ffree=0, f_fsid={val=[0x4f5822b0, 0xf74cbbd4]}, f_namelen=255, f_frsize=4096, f_flags=ST_VALID|ST_RELATIME}) = 0
write(14, "\t\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0006\0\0\0\0\0\0\0/gnu/sto"..., 152) = 152
read(14, "gmlo\0\0\0\0", 8)             = 8
read(14, "\276\0\0\0\0\0\0\0", 8)       = 8
read(14, "@ build-started /gnu/store/kv1gh"..., 192) = 192
)     = 12
write(2, "applying 3 grafts for guix-1.3.0"..., 48applying 3 grafts for guix-1.3.0-29.9e46320 ...
) = 48
read(14, "gmlo\0\0\0\0", 8)             = 8
read(14, "\255\0\0\0\0\0\0\0", 8)       = 8
read(14, "@ build-log 17291 151\ngrafting '"..., 176) = 176
\)                = 5
read(14,
--8<---------------cut here---------------end--------------->8---

After passing --no-grafts to 'guix system reconfigure', it could
complete without any error.

-- 
Thanks,
Maxim

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Subject: bug#58205: Acknowledgement (reconfiguration stuck unless using
 '--no-grafts')
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Date: Fri, 30 Sep 2022 21:19:02 +0000

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58205: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=3D58205
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Subject: bug#58205: reconfiguration stuck unless using '--no-grafts'
Resent-From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
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To: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Cc: 58205 <at> debbugs.gnu.org
From: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
References: <87fsg8lfxh.fsf@HIDDEN>
Date: Sun, 02 Oct 2022 22:19:23 +0200
In-Reply-To: <87fsg8lfxh.fsf@HIDDEN> (Maxim Cournoyer's message of "Fri, 30
 Sep 2022 17:18:18 -0400")
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Hi,

Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:

> While working on Berlin today from a chroot, and with --no-substitutes
> used for guix-daemon, I wasn't able to complete the 'guix system
> reconfigure' step; it'd hand on a read call (seen using strace):
>
> statfs("/gnu/store", {f_type=3DBTRFS_SUPER_MAGIC, f_bsize=3D4096, f_block=
s=3D26843282944, f_bfree=3D14069128626, f_bavail=3D14067391234, f_files=3D0=
, f_ffree=3D0, f_fsid=3D{val=3D[0x4f5822b0, 0xf74cbbd4]}, f_namelen=3D255, =
f_frsize=3D4096, f_flags=3DST_VALID|ST_RELATIME}) =3D 0
> write(14, "\t\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0006\0\0\0\0\0\0\0/gnu/sto"...,=
 152) =3D 152
> read(14, "gmlo\0\0\0\0", 8)             =3D 8
> read(14, "\276\0\0\0\0\0\0\0", 8)       =3D 8
> read(14, "@ build-started /gnu/store/kv1gh"..., 192) =3D 192
> )     =3D 12
> write(2, "applying 3 grafts for guix-1.3.0"..., 48applying 3 grafts for g=
uix-1.3.0-29.9e46320 ...
> ) =3D 48
> read(14, "gmlo\0\0\0\0", 8)             =3D 8
> read(14, "\255\0\0\0\0\0\0\0", 8)       =3D 8
> read(14, "@ build-log 17291 151\ngrafting '"..., 176) =3D 176
> \)                =3D 5
> read(14,

The build process is probably actually grafting things, and while doing
that it doesn=E2=80=99t output anything.  Thus it=E2=80=99s not surprising =
that the
client is stuck on read(2) waiting for data on the daemon socket.  It
might be that the grafting process is just taking a long time?

The way to debug that would be to run =E2=80=98sudo guix processes=E2=80=99=
, to identify
the build process and hand (the one that builds /gnu/store/kv1hg=E2=80=A6.d=
rv in
the example above), and to strace that process.

HTH!

Ludo=E2=80=99.

Message sent to bug-guix@HIDDEN:

Subject: bug#58205: reconfiguration stuck unless using '--no-grafts'
Resent-From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
Original-Sender: "Debbugs-submit" <debbugs-submit-bounces <at> debbugs.gnu.org>
Resent-CC: bug-guix@HIDDEN
Resent-Date: Tue, 04 Oct 2022 12:43:02 +0000
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Resent-Sender: help-debbugs@HIDDEN
To: Ludovic =?UTF-8?Q?Court=C3=A8s?= <ludo@HIDDEN>
Cc: 58205 <at> debbugs.gnu.org
From: Maxim Cournoyer <maxim.cournoyer@HIDDEN>
References: <87fsg8lfxh.fsf@HIDDEN> <87r0zq9dx0.fsf@HIDDEN>
Date: Tue, 04 Oct 2022 08:42:31 -0400
In-Reply-To: <87r0zq9dx0.fsf@HIDDEN> ("Ludovic =?UTF-8?Q?Court=C3=A8s?="'s message of "Sun, 02 Oct 2022 22:19:23 +0200")
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Hi,

Ludovic Court=C3=A8s <ludo@HIDDEN> writes:

> Hi,
>
> Maxim Cournoyer <maxim.cournoyer@HIDDEN> skribis:
>
>> While working on Berlin today from a chroot, and with --no-substitutes
>> used for guix-daemon, I wasn't able to complete the 'guix system
>> reconfigure' step; it'd hand on a read call (seen using strace):
>>
>> statfs("/gnu/store", {f_type=3DBTRFS_SUPER_MAGIC, f_bsize=3D4096,
>> f_blocks=3D26843282944, f_bfree=3D14069128626, f_bavail=3D14067391234,
>> f_files=3D0, f_ffree=3D0, f_fsid=3D{val=3D[0x4f5822b0, 0xf74cbbd4]},
>> f_namelen=3D255, f_frsize=3D4096, f_flags=3DST_VALID|ST_RELATIME}) =3D 0
>> write(14, "\t\0\0\0\0\0\0\0\2\0\0\0\0\0\0\0006\0\0\0\0\0\0\0/gnu/sto"...=
, 152) =3D 152
>> read(14, "gmlo\0\0\0\0", 8)             =3D 8
>> read(14, "\276\0\0\0\0\0\0\0", 8)       =3D 8
>> read(14, "@ build-started /gnu/store/kv1gh"..., 192) =3D 192
>> )     =3D 12
>> write(2, "applying 3 grafts for guix-1.3.0"..., 48applying 3 grafts for =
guix-1.3.0-29.9e46320 ...
>> ) =3D 48
>> read(14, "gmlo\0\0\0\0", 8)             =3D 8
>> read(14, "\255\0\0\0\0\0\0\0", 8)       =3D 8
>> read(14, "@ build-log 17291 151\ngrafting '"..., 176) =3D 176
>> \)                =3D 5
>> read(14,
>
> The build process is probably actually grafting things, and while doing
> that it doesn=E2=80=99t output anything.  Thus it=E2=80=99s not surprisin=
g that the
> client is stuck on read(2) waiting for data on the daemon socket.  It
> might be that the grafting process is just taking a long time?

I think the CPU was idling at the time, per top.  Note that I was in a
chroot setup per info '(guix) Chrooting', with a pretty basic
'guix-daemon' invocation (non-chroot version), in case it could have
anything to do with it.

> The way to debug that would be to run =E2=80=98sudo guix processes=E2=80=
=99, to identify
> the build process and hand (the one that builds /gnu/store/kv1hg=E2=80=A6=
.drv in
> the example above), and to strace that process.

I'll do this next time I encounter this problem, thanks!

--=20
Maxim

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