Re: [C/POSIX] pthread_exit()

From	Melzzzzz <mel@zzzzz.com>
Newsgroups	comp.lang.c
Subject	Re: [C/POSIX] pthread_exit()
Date	2016-07-25 14:00 +0200
Organization	albasani.net
Message-ID	<20160725140043.0ea6bdef@maxa-pc> (permalink)
References	<slrnnovao6.boo.jkb@rayleigh.systella.fr> <20160723005217.73ba92bf@maxa-pc> <slrnnpburt.kce.jkb@rayleigh.systella.fr> <20160725134725.765c4080@maxa-pc> <slrnnpbvne.kce.jkb@rayleigh.systella.fr>

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On Mon, 25 Jul 2016 11:58:38 +0000 (UTC)
JKB <jkb@koenigsberg.invalid> wrote:

> Le Mon, 25 Jul 2016 13:47:25 +0200,
> Melzzzzz <mel@zzzzz.com> écrivait :
> > On Mon, 25 Jul 2016 11:43:57 +0000 (UTC)
> > JKB <jkb@koenigsberg.invalid> wrote:
> >  
> >> Le Sat, 23 Jul 2016 00:52:17 +0200,
> >> Melzzzzz <mel@zzzzz.com> écrivait :  
> >> > On Wed, 20 Jul 2016 16:47:01 +0000 (UTC)
> >> > JKB <jkb@koenigsberg.invalid> wrote:
> >> >    
> >> >> 	Hello,
> >> >> 
> >> >> 	I'm debugging a huge program that can enter in deadlock
> >> >> on a pthread_exit() syscall. I use gcc compiler on Linux or
> >> >> NetBSD.    
> >> >
> >> > Do you observe same behavior on both systems?    
> >> 
> >> 	Not exactly. On Linux side, pthread_exit() enters in a
> >> deadlock. On NetBSD side, I don't know. Execution stops, but when I
> >> try to attach gdb on faulty process, it abots with sigtrap if I
> >> remember.
> >> 
> >> 	I'm sure there is an issue in my code, and I'm not sure
> >> that it is pthread related. pthread_exit() only triggers the bug.
> >> It's not a memory corruption, maybe a race condition, but I have
> >> looked for this condition with a piece of paper without any result.
> >> 
> >> 	Best regards,
> >> 
> >> 	JKB
> >>   
> >
> > If pthread_exit enters deadlock that means either something holds
> > lock or mutex memory is corrupted. NetBSD case shows that probably
> > memory is corrupted rather deadlock...  
> 
> 	Maybe. pthread_exit() (on glibc side) enters in deadlock in
> 	libunwind. I don't see how could lock this mutex. It could be
> a memory corruption also, but I'm trying to track a memory corruption
> for a long time without any success.
> 
> 	Regards,
> 
> 	JKB
> 

Do you unmap a lot? Perhaps you just unmap some region of process
memory leading to this problem?

Thread

[C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-20 16:47 +0000
  Re: [C/POSIX] pthread_exit() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-20 13:42 -0400
    Re: [C/POSIX] pthread_exit() Keith Thompson <kst-u@mib.org> - 2016-07-20 11:33 -0700
    Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-21 10:10 +0000
    Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-22 08:10 -0500
      Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-22 13:42 +0000
        Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-22 09:44 -0500
          Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-22 14:48 +0000
      Re: [C/POSIX] pthread_exit() Richard Heathfield <rjh@cpax.org.uk> - 2016-07-22 14:52 +0100
      Re: [C/POSIX] pthread_exit() supercat@casperkitty.com - 2016-07-22 08:51 -0700
      Re: [C/POSIX] pthread_exit() James Kuyper <jameskuyper@verizon.net> - 2016-07-22 13:26 -0400
      Re: [C/POSIX] pthread_exit() Keith Thompson <kst-u@mib.org> - 2016-07-22 10:28 -0700
        Re: [C/POSIX] pthread_exit() Ian Collins <ian-news@hotmail.com> - 2016-07-23 16:12 +1200
        Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-23 16:43 -0500
          Re: [C/POSIX] pthread_exit() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-23 18:17 -0400
            Re: [C/POSIX] pthread_exit() Keith Thompson <kst-u@mib.org> - 2016-07-23 20:45 -0700
            Re: [C/POSIX] pthread_exit() James Kuyper <jameskuyper@verizon.net> - 2016-07-24 07:27 -0400
              Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-25 15:22 -0500
                Re: [C/POSIX] pthread_exit() Ian Collins <ian-news@hotmail.com> - 2016-07-26 08:26 +1200
                Re: [C/POSIX] pthread_exit() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-25 16:32 -0400
                Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-25 15:52 -0500
                Re: [C/POSIX] pthread_exit() "James R. Kuyper" <jameskuyper@verizon.net> - 2016-07-25 16:59 -0400
                Re: [C/POSIX] pthread_exit() Randy Howard <rhoward.mx@EverybodyUsesIt.com> - 2016-07-25 16:36 -0500
  Re: [C/POSIX] pthread_exit() Johann Klammer <klammerj@NOSPAM.a1.net> - 2016-07-21 11:54 +0200
    Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-22 08:17 +0000
      Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-22 08:47 +0000
  Re: [C/POSIX] pthread_exit() Melzzzzz <mel@zzzzz.com> - 2016-07-23 00:52 +0200
    Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 11:43 +0000
      Re: [C/POSIX] pthread_exit() Melzzzzz <mel@zzzzz.com> - 2016-07-25 13:47 +0200
        Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 11:58 +0000
          Re: [C/POSIX] pthread_exit() Melzzzzz <mel@zzzzz.com> - 2016-07-25 14:00 +0200
            Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 12:18 +0000
              Re: [C/POSIX] pthread_exit() Melzzzzz <mel@zzzzz.com> - 2016-07-25 14:20 +0200
                Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 12:26 +0000
                Re: [C/POSIX] pthread_exit() Melzzzzz <mel@zzzzz.com> - 2016-07-25 14:28 +0200
                Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 12:35 +0000
                Re: [C/POSIX] pthread_exit() JKB <jkb@koenigsberg.invalid> - 2016-07-25 13:44 +0000

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