GNU bug report logs - #31925
'guix substitutes' sometimes hangs on glibc 2.27

Previous Next

Full log

Message #37 received at 31925 <at> debbugs.gnu.org (full text, mbox):

From: Andy Wingo <wingo <at> igalia.com>
To: ludo <at> gnu.org (Ludovic Courtès)
Cc: Mark H Weaver <mhw <at> netris.org>, 31925 <at> debbugs.gnu.org
Subject: Re: bug#31925: 'guix substitutes' sometimes hangs on glibc 2.27
Date: Thu, 05 Jul 2018 16:08:45 +0200

On Thu 05 Jul 2018 14:27, ludo <at> gnu.org (Ludovic Courtès) writes:

> Hello,
>
> Andy Wingo <wingo <at> igalia.com> skribis:
>
>> The signal thread is a possibility though in that case you'd get a
>> warning; the signal-handling thread appears in scm_all_threads.  Do you
>> see a warning?  If you do, that is a problem :)
>
> I don’t see a warning.
>
> But as a Guile user, I shouldn’t see a warning just because there’s a
> signal thread anyway; it’s not a thread I spawned myself.

I understand but it's how it works.  If we want to change this, probably
we need a similar interface as we have with finalization.

> The weird thing is that the signal thread always exists, and it’s
> surprising IMO that it shows up in ‘scm_all_threads’ because it’s not a
> “user thread”.  The other surprise is that the warning isn’t triggered:
>
> $ guile
> GNU Guile 2.2.4
> Copyright (C) 1995-2017 Free Software Foundation, Inc.
>
> Guile comes with ABSOLUTELY NO WARRANTY; for details type `,show w'.
> This program is free software, and you are welcome to redistribute it
> under certain conditions; type `,show c' for details.
>
> Enter `,help' for help.
> scheme@(guile-user)> (all-threads)
> $1 = (#<thread 140488743438080 (1b06c40)> #<thread 140488815434624 (1b06e00)>)
> scheme@(guile-user)> (when (zero? (primitive-fork)) (primitive-_exit 0))
> ;; no warning

Are you certain that this is the signal-handling thread and not the
finalizer thread?  I suspect it is the finalizer thread, and that it
gets properly shut down before the fork.

Regarding seeing the warning: do you do make some other binding for the
default warning port in Guix?

Andy

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.