GNU gdb 6.4.90-debian
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This GDB was configured as "x86_64-linux-gnu"...(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
Attaching to program: /sbin/xfs_repair, process 1948
Reading symbols from /lib/libuuid.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libuuid.so.1
Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
[New Thread 47717600545504 (LWP 1948)]
[New Thread 1115703648 (LWP 1956)]
[New Thread 1107310944 (LWP 1955)]
[New Thread 1098918240 (LWP 1954)]
[New Thread 1090525536 (LWP 1953)]
[New Thread 1082132832 (LWP 1952)]
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux-x86-64.so.2...
(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x00002b661e6cdeeb in __lll_mutex_lock_wait () from /lib/libpthread.so.0
(gdb) bt
#0 0x00002b661e6cdeeb in __lll_mutex_lock_wait () from /lib/libpthread.so.0
#1 0x000000000057e478 in ?? ()
#2 0x0000000000000000 in ?? ()