bash.exe.stackdump generated using cygwin 1.7.15

Corinna Vinschen corinna-cygwin@cygwin.com
Tue May 22 07:34:00 GMT 2012


On May 21 14:50, Eric Blake wrote:
> On 05/21/2012 10:42 AM, Corinna Vinschen wrote:
> 
> >> The crash occurs after echo exited, so bash wakes up from the wait4
> >> call.  However, the problem is that the crash does not occur in Cygwin,
> >> but in bash itself.
> >>
> >>   147  350775 [main] bash 3548 wait4: 2320 = wait4(-1, 0x0, 0, 0x0)
> >>   --- Process 3548, exception C0000005 at 00422B0A
> >>
> >> Eric, can you reproduce this and see where it happens?  I'm pretty sure
> >> it's a bug in Cygwin, not in bash, but it would be interesting to learn
> >> what bash did at the time the crash happened.
> > 
> > Incidentally I built bash without -O2 option for better debugging and
> > the problem vanished.  Then I built bash again with default optimization
> > and the crash still didn't occur.  I built from the latest bash src
> > package.4.1.10-4 using cygport.
> 
> Uggh.  This sounds familiar to another bash bug that I investigated some
> time ago, where bash was abusing longjmp() and miscompiled under -O2 but
> compiled correctly at -O0 due to the undefined behavior from that abuse,
> but I just verified that my patch from back then is still present in my
> latest build of bash for cygwin.  I'll have to find more time to look
> into this.
> https://lists.gnu.org/archive/html/bug-bash/2011-02/msg00060.html

In my testing it doesn't matter if I build execute_cmd.c or, FWIW,
any of bash's source files with -O0, -O1, or -O2.  My self-built
bash never crashes in this scenario.


Corinna

-- 
Corinna Vinschen                  Please, send mails regarding Cygwin to
Cygwin Project Co-Leader          cygwin AT cygwin DOT com
Red Hat

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