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Subject: bug#72340: guix should not ask me to report a bug if it fails due to running out of memory
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If a guix operation fails due to running out of memory, it's reported
to the user as an internal error, instructing them to report a bug to
bug-guix.  For example:

# guix pull
Updating channel 'guix' from Git repository at 'https://git.savannah.gnu=
.org/git/guix.git'...
Building from this channel:
  guix      https://git.savannah.gnu.org/git/guix.git	46a64c7
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...=
 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...=
 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
substitute: updating substitutes from 'https://bordeaux.guix.gnu.org'...=
 100.0%
substitute: updating substitutes from 'https://ci.guix.gnu.org'... 100.0%
 module-import  2KiB                  56KiB/s 00:00 =E2=96=95=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=8F 100.0%
 module-import-compiled  1.3MiB      2.4MiB/s 00:01 =E2=96=95=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=8F 100.0%
 compute-guix-derivation  1KiB       877KiB/s 00:00 =E2=96=95=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=96=88=E2=
=96=88=E2=96=8F 100.0%
Computing Guix derivation for 'x86_64-linux'... \
GC Warning: Failed to expand heap by 8388608 bytes
[previous line repeats 79 more times]
GC Warning: Failed to expand heap by 69632 bytes
GC Warning: Out of Memory! Heap size: 402 MiB. Returning NULL!
Warning: Unwind-only out of memory exception; skipping pre-unwind handle=
r.
guix pull: error: You found a bug: the program
'/gnu/store/6pckga173mjbpfz7a2bl93h4gimd8fp5-compute-guix-derivation'
failed to compute the derivation for Guix (version:
"46a64c7fdd057283063aae6df058579bb07c4b6a"; system: "x86_64-linux";
host version: "e4aabf42b33346849cb565199cfafc49d4f0aeff";
pull-version: 1).  Please report the COMPLETE output above by email to
<bug-guix@HIDDEN>.

The fact that it ran the computer out of RAM is *not* a bug per se --
perhaps we could talk about reducing "guix pull"'s memory
requirements, but that's a big hairy design challenge probably.

But that means there *is* a bug: the fatal exception handler should
have a dedicated message for out-of-memory conditions, directing the
user to add more swap or something, instead of reporting a bug.

For reference, this is a server with this much RAM as of when I ran
the above command:

# free -h
               total        used        free      shared  buff/cache   a=
vailable
Mem:           969Mi       229Mi       557Mi          0B       319Mi    =
   739Mi
Swap:          613Mi        39Mi       574Mi

Enabling zswap did not permit a successful "guix pull" but increasing
the amount of available swap space to 2Gi did.  (Memory overcommit is
disabled.  Peak memory usage, with the increased swap, was roughly
1.5Gi.)

zw

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From: help-debbugs@HIDDEN (GNU bug Tracking System)
To: "Zack Weinberg" <zack@HIDDEN>
Subject: bug#72340: Acknowledgement (guix should not ask me to report a
 bug if it fails due to running out of memory)
Message-ID: <handler.72340.B.172218259718700.ack <at> debbugs.gnu.org>
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Message sent to bug-guix@HIDDEN:

Subject: bug#72340: guix should not ask me to report a bug if it fails due to running out of memory
Resent-From: Simon Tournier <zimon.toutoune@HIDDEN>
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Date: Tue, 03 Sep 2024 16:39:27 +0200
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Hi,

On Sun, 28 Jul 2024 at 16:02, "Zack Weinberg" via Bug reports for GNU Guix <bug-guix@HIDDEN> wrote:

> Computing Guix derivation for 'x86_64-linux'... \
> GC Warning: Failed to expand heap by 8388608 bytes
> [previous line repeats 79 more times]
> GC Warning: Failed to expand heap by 69632 bytes
> GC Warning: Out of Memory! Heap size: 402 MiB. Returning NULL!
> Warning: Unwind-only out of memory exception; skipping pre-unwind handler.
> guix pull: error: You found a bug: the program
> '/gnu/store/6pckga173mjbpfz7a2bl93h4gimd8fp5-compute-guix-derivation'
> failed to compute the derivation for Guix (version:
> "46a64c7fdd057283063aae6df058579bb07c4b6a"; system: "x86_64-linux";
> host version: "e4aabf42b33346849cb565199cfafc49d4f0aeff";

I guess this bug had been fixed since then.  Do you still have it?

Aside, I am not able to reproduce it:

    guix time-machine -q --commit=e4aabf42b33346849cb565199cfafc49d4f0aeff \
      -- time-machine -q --commit=46a64c7fdd057283063aae6df058579bb07c4b6a \
      -- describe

This passes for me.

Cheers,
simon

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Subject: bug#72340: guix should not ask me to report a bug if it fails due to running out of memory
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Date: Tue, 03 Sep 2024 11:30:41 -0400
From: "Zack Weinberg" <zack@HIDDEN>
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On Tue, Sep 3, 2024, at 10:39 AM, Simon Tournier wrote:
> On Sun, 28 Jul 2024 at 16:02, "Zack Weinberg" via Bug reports for GNU 
> Guix <bug-guix@HIDDEN> wrote:
>
>> Computing Guix derivation for 'x86_64-linux'... \
>> GC Warning: Failed to expand heap by 8388608 bytes
>> [previous line repeats 79 more times]
>> GC Warning: Failed to expand heap by 69632 bytes
>> GC Warning: Out of Memory! Heap size: 402 MiB. Returning NULL!
>> Warning: Unwind-only out of memory exception; skipping pre-unwind handler.
>> guix pull: error: You found a bug: the program
>> '/gnu/store/6pckga173mjbpfz7a2bl93h4gimd8fp5-compute-guix-derivation'
>> failed to compute the derivation for Guix (version:
>> "46a64c7fdd057283063aae6df058579bb07c4b6a"; system: "x86_64-linux";
>> host version: "e4aabf42b33346849cb565199cfafc49d4f0aeff";
>
> I guess this bug had been fixed since then.  Do you still have it?

I reconfigured my Guix system to avoid the bug, so I cannot easily
trigger it anymore.  However, this is not a bug that would go away by
accident.  Until someone writes code specifically intended to produce
a better error message when Guile runs out of memory, the bug will be
live.

> Aside, I am not able to reproduce it:
>
>     guix time-machine -q --commit=e4aabf42b33346849cb565199cfafc49d4f0aeff \
>       -- time-machine -q --commit=46a64c7fdd057283063aae6df058579bb07c4b6a \
>       -- describe

In order to reproduce the bug you need to be working in an environment
(probably a virtual machine is easiest) with a limited amount of
system memory (512MB of RAM and no swap should do it) and memory
overcommit disabled (sysctl -w vm.overcommit_memory=2).

Also, I don't know what "guix time-machine" does but I would not
expect "guix describe" to use substantial amounts of memory.  You need
to run a command that computes a large derivation, such as "guix pull"
or "guix system reconfigure".

zw

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From: Simon Tournier <zimon.toutoune@HIDDEN>
In-Reply-To: <1cf310cf-8d7f-4f6d-9b07-397ebdaa1ffc@HIDDEN> (Zack
 Weinberg's message of "Tue, 03 Sep 2024 11:30:41 -0400")
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Hi,

On Tue, 03 Sep 2024 at 11:30, "Zack Weinberg" <zack@HIDDEN> wrote:

> I reconfigured my Guix system to avoid the bug, so I cannot easily
> trigger it anymore.  However, this is not a bug that would go away by
> accident.

Yes for sure, that=E2=80=99s not what I meant. :-)

This can happen if a cycle is introduced, i.e., package foo depending on
package foo.  Or it can happen for other reasons, as it seems the case here.

Well, this bug seems an instance of bug#47543 [1].

1: bug#47543: =E2=80=9CRepeated allocation of very large block=E2=80=9D dur=
ing =E2=80=98guix pull=E2=80=99
Ludovic Court=C3=A8s <ludovic.courtes@HIDDEN>
Thu, 01 Apr 2021 16:00:06 +0200
id:87v9966r6h.fsf@HIDDEN
https://issues.guix.gnu.org/47543
https://issues.guix.gnu.org/msgid/87v9966r6h.fsf@HIDDEN
https://yhetil.org/guix/87v9966r6h.fsf@HIDDEN


> Also, I don't know what "guix time-machine" does but I would not
> expect "guix describe" to use substantial amounts of memory.  You need
> to run a command that computes a large derivation, such as "guix pull"
> or "guix system reconfigure".

=E2=80=9Cguix time-machine=E2=80=9D runs =E2=80=9Cguix pull=E2=80=9D, other=
 said:

     guix time-machine -q --commit=3De4aabf42b33346849cb565199cfafc49d4f0ae=
ff \
       -- time-machine -q --commit=3D46a64c7fdd057283063aae6df058579bb07c4b=
6a \
       -- describe

is more or less equivalent to:

    guix pull --commit=3De4aabf42b33346849cb565199cfafc49d4f0aeff -p /tmp/h=
ost
    /tmp/host/bin/guix pull --commit=3D46a64c7fdd057283063aae6df058579bb07c=
4b6a

which minimicks what you ran.  Indeed, I=E2=80=99ve run it on my machine an=
d not
inside some VM with constrained memory.  However, considering bug#47543
[1], I am not convinced the crash comes from this constrained memory.

Hum, maybe it=E2=80=99s worth merging with bug#47543 [1].  WDYT?

Cheers,
simon

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Subject: bug#72340: guix should not ask me to report a bug if it fails due to running out of memory
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From: "Zack Weinberg" <zack@HIDDEN>
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On Tue, Sep 3, 2024, at 12:09 PM, Simon Tournier wrote:
>
> Well, this bug seems an instance of bug#47543 [1].

It is not.  This bug is "When guix runs out of memory, it prints an error
message that gives the user unhelpful advice."  That is not the same as
any particular reason why guix might run out of memory.

> =E2=80=9Cguix time-machine=E2=80=9D runs =E2=80=9Cguix pull=E2=80=9D, =
other said:
>
>      guix time-machine -q --commit=3De4aabf42b33346849cb565199cfafc49d=
4f0aeff \
>        -- time-machine -q --commit=3D46a64c7fdd057283063aae6df058579bb=
07c4b6a \
>        -- describe
>
> is more or less equivalent to:
>
>     guix pull --commit=3De4aabf42b33346849cb565199cfafc49d4f0aeff -p /=
tmp/host
>     /tmp/host/bin/guix pull --commit=3D46a64c7fdd057283063aae6df058579=
bb07c4b6a
>
> which minimicks what you ran.

Thanks for the explanation.

zw

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