Comment 6 for bug 357556

Seems to be generally unstable; here's another backtrace:

Program received signal SIGSTOP, Stopped (signal).
0xb7ff8430 in __kernel_vsyscall ()
(gdb) backtrace
#0 0xb7ff8430 in __kernel_vsyscall ()
#1 0xb7d9d1fc in __libc_writev (fd=3, vector=0xbfb138e0, count=3) at ../sysdeps/unix/sysv/linux/writev.c:46
#2 0xb7ca9dbc in ?? () from /usr/lib/libxcb.so.1
#3 0xb7caa30e in ?? () from /usr/lib/libxcb.so.1
#4 0xb7caa6b7 in xcb_writev () from /usr/lib/libxcb.so.1
#5 0xb7eb6afa in _XSend (dpy=0x9f3f128, data=0x0, size=0) at ../../src/xcb_io.c:332
#6 0xb7eb6c23 in _XReply (dpy=0x9f3f128, rep=0xbfb13970, extra=0, discard=1) at ../../src/xcb_io.c:450
#7 0xb7eaa507 in XSync (dpy=0x9f3f128, discard=0) at ../../src/Sync.c:48
#8 0x0804d87b in ?? ()
#9 0xb7cd7775 in __libc_start_main (main=0x804d180 <XPending@plt+12852>, argc=8, ubp_av=0xbfb13d04, init=0x8051fe0 <XPending@plt+32916>,
    fini=0x8051fd0 <XPending@plt+32900>, rtld_fini=0xb8007870 <_dl_fini>, stack_end=0xbfb13cfc) at libc-start.c:220
#10 0x08049f81 in ?? ()