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Subject: RE: Quick testfeedback...
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Date: Wed, 12 Sep 2001 11:36:24 +1000
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Thread-Topic: Quick testfeedback...
Thread-Index: AcE7JoUaA+X09+6xS6iUlVnyieILpwABL+hg
From: "Robert Collins" <robert DOT collins AT itdomain DOT com DOT au>
To: "Jason Tishler" <jason AT tishler DOT net>, <cygwin-developers AT cygwin DOT com>
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Jason, 
This looks like you are getting the crash with the critical section
based patch applied? Is that correct?

Rob

> -----Original Message-----
> From: Jason Tishler [mailto:jason AT tishler DOT net]
> Sent: Wednesday, September 12, 2001 11:15 AM
> To: Robert Collins; cygwin-developers AT cygwin DOT com
> Subject: Re: Quick testfeedback...
> 
> 
> On Tue, Sep 11, 2001 at 08:40:19PM -0400, Jason Tishler wrote:
> > On Wed, Sep 12, 2001 at 09:19:19AM +1000, Robert Collins wrote:
> > > If it was after the bugfix commit, I'd like to see if we 
> can track this
> > > asap...
> > 
> > I can reproduce it frequently but not every time.  I will 
> debug it first
> > thing tomorrow morning.  FYI, it seems to occur right near 
> the end of
> > the test and the test still passes.
> 
> Doh!  My first shot running broadcast from gdb caused the SIGSEGV:
> 
> (gdb) run
> Starting program: /home/jt/src/PthreadTest-0.1/broadcast.exe 
> before cond wait
> ..
> before cond broadcast
> after  cond broadcast
> after  cond wait
> 
> Program received signal SIGSEGV, Segmentation fault.
> [Switching to thread 1804.0x2dc]
> 0x6100f0cb in call_signal_handler_now ()
>     at ../../../../src/winsup/cygwin/exceptions.cc:1132
> 1132      *sigsave.retaddr_on_stack = sigsave.retaddr;
> Current language:  auto; currently c++
> (gdb) bt
> #0  0x6100f0cb in call_signal_handler_now ()
>     at ../../../../src/winsup/cygwin/exceptions.cc:1132
> #1  0x6100f12e in sigframe::call_signal_handler (this=0x1e06f360)
>     at ../../../../src/winsup/cygwin/exceptions.cc:1146
> #2  0x6104ff64 in sleep (seconds=2)
>     at ../../../../src/winsup/cygwin/signal.cc:84
> #3  0x004011fe in baby () at broadcast.c:56
> #4  0x61063b6c in thread_init_wrapper (_arg=0xa011588)
>     at ../../../../src/winsup/cygwin/thread.cc:865
> #5  0x77e837cd in _cygheap_start ()
> (gdb) list
> 1127    static int __stdcall
> 1128    call_signal_handler_now ()
> 1129    {
> 1130      int sa_flags = sigsave.sa_flags;
> 1131      sigproc_printf ("sa_flags %p", sa_flags);
> 1132      *sigsave.retaddr_on_stack = sigsave.retaddr;
> 1133      sigdelayed0 ();
> 1134      return sa_flags & SA_RESTART;
> 1135    }
> 1136    /* This kludge seems to keep a copy of 
> call_signal_handler_now around
> (gdb) p sigsave.retaddr_on_stack
> $1 = (DWORD *) 0x0
> 
> I really have to go now.  I will pick this up first thing in 
> the morning
> assuming that I'm not still in the dog house...  No cable 
> modem there... :,)
> 
> Jason
>