Segfault in uid_wrapper ?

[Uri Simchoni]

Hi,

Exec summary - I get a segfault running a samba-tool with uid_wrapper, 
at lib/uid_wrapper/uid_wrapper.c:823, "id" is NULL.

I have so little experience with samba tests and cwrap, that I may be 
barking at the wrong tree here...

I have autobuild failing on a local FC22 machine (pretty much 
up-to-date), samba master. The failure is in one of the very first 
tests, while trying to provision an AD DC. I tried running the command 
that failed and it segfaulted (python did). The core dump points at that 
line in uid_wrapper, and according to the core dump, id==NULL.

The segfault occurred while calling "import uuid" from within one of the 
modules, which in turn called os.popen() and generated a stack that ends 
with the following C code:
#0  0x00007fd419ca6497 in uwrap_thread_prepare () at 
../lib/uid_wrapper/uid_wrapper.c:823
#1  0x00007fd418cb8ae2 in fork () from /lib64/libc.so.6
#2  0x00007fd418c5f794 in _IO_proc_open@@GLIBC_2.2.5 () from 
/lib64/libc.so.6
#3  0x00007fd418c5fa3c in popen@@GLIBC_2.2.5 () from /lib64/libc.so.6
#4  0x00007fd4199f1737 in posix_popen () from /lib64/libpython2.7.so.1.0

Attached you can see the logs from autobuild, as well as the command I 
tried running to reproduce, based on the autobuild logs (I used 
nocleanup so it runs on the cwrap env created by make test).

If the command I ran seems to be compatible with what was failing inside 
autobuild, and the crash reason is not obvious, I can dig deeper or 
provide any requested info. I just want to know there isn't something 
obvious that's causing the core dump that's not related to autobuild 
failure.

Thanks,
Uri.

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