SIGSEGV in '_Unwind_Backtrace'

Soumya Koduri skoduri@redhat.com
Mon Dec 21 12:39:00 GMT 2015


Hi,

We are running into "Segmentation fault" in libgcc with below back trace 
(not often though) at times. Appreciate any help in debugging and 
resolving it.

Program terminated with signal 11, Segmentation fault.
#0  0x00007f800426f867 in ?? () from ./lib64/libgcc_s.so.1
Missing separate debuginfos, use: debuginfo-install 
glibc-2.12-1.132.el6_5.1.x86_64 keyutils-libs-1.4-4.el6.x86_64 
krb5-libs-1.10.3-10.el6_4.6.x86_64 libcom_err-1.41.12-18.el6.x86_64 
libgcc-4.4.7-4.el6.x86_64 libselinux-2.0.94-5.3.el6_4.1.x86_64 
openssl-1.0.1e-15.el6.x86_64 zlib-1.2.3-29.el6.x86_64
(gdb) bt
#0  0x00007f800426f867 in ?? () from ./lib64/libgcc_s.so.1
#1  0x00007f8004270119 in _Unwind_Backtrace () from ./lib64/libgcc_s.so.1
#2  0x00007f800fb46936 in backtrace () from ./lib64/libc.so.6
#3  0x00007f8010ee6f73 in _gf_msg_backtrace_nomem (level=GF_LOG_ALERT, 
stacksize=200)
     at 
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/logging.c:1090
#4  0x00007f8010eecd38 in gf_print_trace (signum=11, ctx=0xda7010)
     at 
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/libglusterfs/src/common-utils.c:740
#5  0x00000000004098d6 in glusterfsd_print_trace (signum=11)
     at 
/home/jenkins/root/workspace/rackspace-regression-2GB-triggered/glusterfsd/src/glusterfsd.c:2033
#6  <signal handler called>
#7  0x00007f7fff1aa561 in ?? ()
#8  0x00007f80101c6a51 in start_thread () from ./lib64/libpthread.so.0
#9  0x00007f800fb3093d in clone () from ./lib64/libc.so.6
(gdb)


#readelf -s lib64/libgcc_s.so.1 | grep Unwind_Backtrace
     43: 00000000000100a0   183 FUNC    GLOBAL DEFAULT   12 
_Unwind_Backtrace@@GCC_3.3


Thanks,
Soumya



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