[fprint] Strange Crash in __pthread_mutex_unlock_usercnt

[Keaton Mowery]

Hi all,

I'm seeing a very odd crash while using libfprint's async API. Here's
a backtrace:

---------
Program received signal SIGSEGV, Segmentation fault.
0xb4e14211 in __pthread_mutex_unlock_usercnt () from
/lib/i686/cmov/libpthread.so.0
(gdb) bt
#0  0xb4e14211 in __pthread_mutex_unlock_usercnt () from
/lib/i686/cmov/libpthread.so.0
#1  0xb4efd016 in pthread_mutex_unlock () from /lib/i686/cmov/libc.so.6
#2  0xb4e04f0e in ?? () from /lib/libusb-1.0.so.0
#3  0xb4e02e65 in ?? () from /lib/libusb-1.0.so.0
#4  0xb4e03641 in libusb_handle_events_timeout () from /lib/libusb-1.0.so.0
#5  0xb5137a7f in fp_handle_events_timeout (timeout=0xbffff5e4) at poll.c:231
#6  0x08052800 in main (argc=1, argv=0xbffff6d4) at fpserv.cpp:27
---------

Something also sometimes dumps to dmesg:
[   54.740378] fpserv[1714]: segfault at 9f2ac60 ip b453d211 sp
bfee078c error 4 in libpthread-2.11.2.so[b4534000+15000]

We have a microsoft fingerprint reader, and have 156 enrolled fingerprints.

Any thoughts?

Thanks.

Keaton