[?1034hGNU gdb Red Hat Linux (6.6-45.fc8rh)
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This GDB was configured as "i386-redhat-linux-gnu"...
Using host libthread_db library "/lib/libthread_db.so.1".
Core was generated by `/usr/sbin/asterisk -cvvvvvv'.
Program terminated with signal 11, Segmentation fault.
#0  0x005af360 in pthread_mutex_lock () from /lib/libpthread.so.0
(gdb) where
#0  0x005af360 in pthread_mutex_lock () from /lib/libpthread.so.0
#1  0x08082e38 in ast_do_masquerade (original=0xb7802fe8)
    at /usr/src/asterisk-1.4.18.1/include/asterisk/lock.h:701
#2  0x00c605e9 in local_attended_transfer (transferer=0x963d6a0, 
    current=0xb79c81e4, req=<value optimized out>, seqno=2) at chan_sip.c:14320
#3  0x00c617ae in handle_request_refer (p=0x963d6a0, req=0xb79caf1c, 
    debug=<value optimized out>, ignore=0, seqno=2, nounlock=0xb79cc254)
    at chan_sip.c:14547
#4  0x00c6c9f9 in handle_request (p=0x963d6a0, req=0xb79caf1c, sin=0xb79cc240, 
    recount=0xb79cc250, nounlock=0xb79cc254) at chan_sip.c:15351
#5  0x00c6e5de in sipsock_read (id=0x9631558, fd=17, events=1, ignore=0x0)
    at chan_sip.c:15495
#6  0x080a9da0 in ast_io_wait (ioc=0x962cf28, howlong=1000) at io.c:279
#7  0x00c46dd9 in do_monitor (data=0x0) at chan_sip.c:15708
#8  0x080f960b in dummy_start (data=0x9631448) at utils.c:852
#9  0x005ad50b in start_thread () from /lib/libpthread.so.0
#10 0x004eeb2e in clone () from /lib/libc.so.6
Missing separate debuginfos, use: debuginfo-install curl.i386 e2fsprogs.i386 glibc.i686 keyutils.i386 krb5.i386 libcap.i386 libidn.i386 libogg.i386 libselinux.i386 libvorbis.i386 mysql.i386 ncurses.i386 nspr.i386 nss.i386 openssl.i686 zlib.i386
(gdb) quit