bash.exe.stackdump generated using cygwin 1.7.15

Eric Blake
Mon May 21 20:51:00 GMT 2012

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.

Eric Blake    +1-919-301-3266
Libvirt virtualization library

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