Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.lang.c > #90980

Re: [C/POSIX] pthread_exit()

From Melzzzzz <mel@zzzzz.com>
Newsgroups comp.lang.c
Subject Re: [C/POSIX] pthread_exit()
Date 2016-07-25 14:20 +0200
Organization albasani.net
Message-ID <20160725142001.7e3f629e@maxa-pc> (permalink)
References (2 earlier) <slrnnpburt.kce.jkb@rayleigh.systella.fr> <20160725134725.765c4080@maxa-pc> <slrnnpbvne.kce.jkb@rayleigh.systella.fr> <20160725140043.0ea6bdef@maxa-pc> <slrnnpc0ss.kce.jkb@rayleigh.systella.fr>

Show all headers | View raw

On Mon, 25 Jul 2016 12:18:35 +0000 (UTC)
JKB <jkb@koenigsberg.invalid> wrote:

> Le Mon, 25 Jul 2016 14:00:43 +0200,
> Melzzzzz <mel@zzzzz.com> écrivait :
> > 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?  
> 
> 	I only use one mmap(). And I unmap this memory _after_
> 	pthread_join().
> 
> 	When pthread_exit() enters in deadlock, I have checked that
> mmaped object is available.
> 
> 	Regards,
> 
> 	JKB
> 

It is not problem *when* you munmap, rather *what* you munmap....

Back to comp.lang.c | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

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

csiph-web