RE: intermittent hangs with threads (clone() bug?/linuxthreads bug?)

[Kári Davíðsson]

Hi,

I am having the same problems, except with glibc 2.1.3.
When I linked Electric fence to the program it sefaults in
the __builtin_new from the c++ library.

So it seems that the problem (at least in 2.13) is somehow connected to 
non thread safe allocation routines or somehthing.
I haven't figured it out yet though............

Maybe you are experiencing somehting similar...

K.D.
> -----Original Message-----
> From: Wolfram Gloger [mailto:address@hidden
> Sent: 20. júní 2001 08:46
> To: address@hidden
> Cc: address@hidden; address@hidden
> Subject: Re: intermittent hangs with threads (clone() 
> bug?/linuxthreads
> bug?)
> 
> 
> Hi,
> 
> > I am experiencing intermittent hangs running LinuxThreads 
> programs from a shell script.  This happens with any 
> combination of stock RH 7.1 SMP kernel (2.4.2) or my own 
> 2.4.5 kernel and stock RH 7.1 libc (2.2.2), redhat rawhide 
> libc (2.2.3) and my own 2.2.3 libc.
> > 
> > If I run, for example, linuxthreads/Examples/ex1 (one 
> thread prints 'a', one prints 'b') it will run fine.  If I 
> run it from a shell script (bash or ksh) with 
> >    exec ex1
> > it almost always hangs.
> ...
> > (gdb) where
> > #0  0x40067ff5 in __sigsuspend (set=0xbffff2e8)
> >     at ../sysdeps/unix/sysv/linux/sigsuspend.c:45
> > #1  0x4002d25f in __pthread_wait_for_restart_signal 
> (self=0x40036300)
> >     at pthread.c:958
> > #2  0x4002cbc4 in __pthread_create_2_1 (thread=0xbffff454, 
> attr=0x0, 
> >     start_routine=0x8048580 <process>, arg=0x804871d) at 
> restart.h:34
> > #3  0x080485e7 in main () at ex1.c:29
> > #4  0x400565e7 in __libc_start_main (main=0x80485cc <main>, argc=1, 
> >     ubp_av=0xbffff4c4, init=0x80483d0 <_init>, 
> fini=0x80486e0 <_fini>, 
> >     rtld_fini=0x4000e154 <_dl_fini>, stack_end=0xbffff4bc)
> >     at ../sysdeps/generic/libc-start.c:129
> 
> Your report is very interesting to me, because I'm currently
> investigating a problem with fork() and malloc() where I see exactly
> the same symptoms.  So you say you can reproduce it with just 2 CPUs
> (I only have access to a 2 CPU machine) and the unchanged `ex1' code?
> I will try that tonight.
> 
> Thanks,
> Wolfram.
> 
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