Comment 4 for bug 425593

I re-run firefox in gdb:
(gdb) r

...

when firefox started up, I close it and got this, I dont know know whether it is relevant or not:

[Thread 0x7fffe6ce4910 (LWP 17828) exited]

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff3038548 in require_socket (dpy=0x7ffff67a0000) at ../../src/xcb_io.c:35
35 ../../src/xcb_io.c: No such file or directory.
        in ../../src/xcb_io.c
(gdb) backtrace
#0 0x00007ffff3038548 in require_socket (dpy=0x7ffff67a0000) at ../../src/xcb_io.c:35
#1 0x00007ffff3039289 in _XFlush (dpy=0x7ffff67a0000) at ../../src/xcb_io.c:348
#2 0x00007ffff30267c0 in XQueryExtension (dpy=0x7ffff67a0000, name=0x7ffff352e120 "RENDER", major_opcode=0x7fffffffe024,
    first_event=0x7fffffffe028, first_error=0x7fffffffe02c) at ../../src/QuExt.c:47
#3 0x00007ffff301ae22 in XInitExtension (dpy=0x7ffff67a0000, name=0x7ffff3039170 "SH\213\207h\t") at ../../src/InitExt.c:49
#4 0x00007ffff332c00f in XRenderFindDisplay () from /usr/lib/libXrender.so.1
#5 0x00007ffff3329bae in XRenderFreePicture () from /usr/lib/libXrender.so.1
#6 0x00007fffe515d0dd in QX11PixmapData::release (this=0x7fffd7b38550) at image/qpixmap_x11.cpp:1206
#7 0x00007fffe515d814 in ~QX11PixmapData (this=0x7ffff67a0000, __in_chrg=<value optimized out>) at image/qpixmap_x11.cpp:1182
#8 0x00007fffe514e6cb in QPixmap::deref (this=0x7fffd7b030d0) at image/qpixmap.cpp:1322
#9 0x00007fffe514e8cb in ~QPixmap (this=0x7ffff67a0000, __in_chrg=<value optimized out>) at image/qpixmap.cpp:332
#10 0x00007fffe4aae08c in ~TileSet (this=0x7fffd7b03000, __in_chrg=<value optimized out>) at ../../../kstyles/oxygen/lib/tileset.h:61
#11 0x00007fffe4abab87 in QCache<unsigned long long, TileSet>::clear (this=0x7fffe85ce210) at /usr/include/qt4/QtCore/qcache.h:138
#12 0x00007fffe4abadb7 in ~QCache (this=0x7fffe85ce000, __in_chrg=<value optimized out>) at /usr/include/qt4/QtCore/qcache.h:102
#13 ~OxygenStyleHelper (this=0x7fffe85ce000, __in_chrg=<value optimized out>) at ../../../kstyles/oxygen/helper.h:40
#14 0x00007ffff6bfdc12 in __run_exit_handlers (status=0) at exit.c:78
#15 *__GI_exit (status=0) at exit.c:100
#16 0x00007ffff6be3ac4 in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>,
    init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fffffffe328) at libc-start.c:252
#17 0x0000000000401f99 in ?? ()
#18 0x00007fffffffe328 in ?? ()
#19 0x000000000000001c in ?? ()
#20 0x0000000000000001 in ?? ()
#21 0x00007fffffffe67a in ?? ()
#22 0x0000000000000000 in ?? ()
(gdb)