GNU bug report logs - #40525
inferior process on core-updates crashes: mmap(PROT_NONE) failed

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Christopher Baines <mail <at> cbaines.net>
Cc: tracker <at> debbugs.gnu.org, bug-strong-list <at> debbugs.gnu.org
Subject: bug#40525: closed (inferior process on core-updates crashes:
 mmap(PROT_NONE) failed)
Date: Sat, 18 Apr 2020 16:54:02 +0000

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Your message dated Sat, 18 Apr 2020 17:53:17 +0100
with message-id <877dyc68hu.fsf <at> cbaines.net>
and subject line Re: bug#40525: inferior process on core-updates crashes: mmap(PROT_NONE) failed
has caused the debbugs.gnu.org bug report #40525,
regarding inferior process on core-updates crashes: mmap(PROT_NONE) failed
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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40525: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=40525
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From: Christopher Baines <mail <at> cbaines.net>
To: bug-guix <at> gnu.org
Subject: inferior process on core-updates crashes: mmap(PROT_NONE) failed
Date: Thu, 09 Apr 2020 20:45:15 +0100

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Hey,

The Guix Data Service seems to be having trouble processing the
core-updates branch [1]

1: https://guix-patches-data.cbaines.net/repository/2/branch/core-updates

At some point, usually when extracting the information about lint
warnings, package derivations or system tests, the inferior guix repl
crashes.

Looking at some strace output (attached), a mmap system call fails with
ENOMEM, however I don't think my system was out of memory or that the
process was even using that much memory at the time.

I'm not trying to use the Guix Data Service much with the core-updates
branch, but I wouldn't want this issue to break the data at
data.guix.gnu.org once the core-updates changes are merged.

Any ideas?

Thanks,

Chris

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From: Christopher Baines <mail <at> cbaines.net>
To: Ludovic Courtès <ludo <at> gnu.org>, Marius Bakke
 <mbakke <at> fastmail.com>
Cc: 40525-done <at> debbugs.gnu.org
Subject: Re: bug#40525: inferior process on core-updates crashes:
 mmap(PROT_NONE) failed
Date: Sat, 18 Apr 2020 17:53:17 +0100

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Christopher Baines <mail <at> cbaines.net> writes:

> Ludovic Courtès <ludo <at> gnu.org> writes:
>
>> Glad you manage to get more info.
>>
>> Christopher Baines <mail <at> cbaines.net> skribis:
>>
>>> Following up on this, I've built Guile on core-updates with libgc <at> 7
>>> rather than libgc <at> 8 (which is what's used above), and I can't reproduce
>>> the issue. So, I'm getting more certain that this is a regression which
>>> the libgc upgrade has led to.
>>
>> Bah.  :-/
>>
>> We noticed similar issues with libgc <at> 8 earlier but it seemed to be
>> fixed:
>>
>>   https://debbugs.gnu.org/cgi/bugreport.cgi?bug=36812
>>
>>> Would it be feasible to keep guile, or at least the guile Guix uses with
>>> libgc <at> 7 for now?
>>
>> Yes, we can define a Guile variant in (gnu packages guile) and have
>> (guix self) refer to it.
>
> I've sent a patch which I think does this now [1]. Assuming I've done
> the right thing, is this something that can be merged in to core-updates
> Marius?
>
> 1: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=40684
>
> I've tested the patch by running:
>
>   ./pre-inst-env guile build-aux/compile-as-derivation.scm "$PWD"
>
> Then taking the Guix I get, and trying the script to reproduce the issue
> through the guix repl, and it seems to work.

I've merged the fix [1] in now, and it looks to have worked [2].

1: https://debbugs.gnu.org/cgi/bugreport.cgi?bug=40684
2: https://guix-patches-data.cbaines.net/revision/cef392f3936922b7b0b74bd59be67e660c10db67

Thanks for your help in resolving this Ludo!

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