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Re: bash.exe.stackdump generated using cygwin 1.7.15
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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