[dm-devel] [QUESTION] multipathd crash when stopping

[lixiaokeng]

>>
>>    Thanks very much. Your suggestions is very helpful.
>>    The problem reproduced and the bug seems that shown in
>> https://bugzilla.redhat.com/show_bug.cgi?id=1293594.
> 
> Really? I don't see a connection to your case there. It's about
> glusterfs and libgcc...
> 
> Martin
> 
> 
Hi Martin:

    Change code as your suggestion, multipathd crash happens easly.
Stack:
#0  0x0000ffffb6118f4c in aarch64_fallback_frame_state (context=0xffffb523f200, context=0xffffb523f200, fs=0xffffb523e700) at ./md-unwind-support.h:74
#1  uw_frame_state_for (context=context at entry=0xffffb523f200, fs=fs at entry=0xffffb523e700) at ../../../libgcc/unwind-dw2.c:1257
#2  0x0000ffffb6119ef4 in _Unwind_ForcedUnwind_Phase2 (exc=exc at entry=0xffffb52403b0, context=context at entry=0xffffb523f200) at ../../../libgcc/unwind.inc:155
#3  0x0000ffffb611a284 in _Unwind_ForcedUnwind (exc=0xffffb52403b0, stop=stop at entry=0xffffb64846c0 <unwind_stop>, stop_argument=0xffffb523f630) at ../../../libgcc/unwind.inc:207
#4  0x0000ffffb6484860 in __GI___pthread_unwind (buf=<optimized out>) at unwind.c:121
#5  0x0000ffffb6482d08 in __do_cancel () at pthreadP.h:304
#6  __GI___pthread_testcancel () at pthread_testcancel.c:26
#7  0x0000ffffb5c528e8 in ?? ()

This issue seems being different from that I described firstly.
Do you think they are related?
Will udev_device_unref lead to double free about first issue?

Regards,
Lixiaokeng