Comment 27 for bug 1127497

That was quick. I didn't have to exit steam though, just launch it:

Program received signal SIGABRT, Aborted.
0x00007ff335664037 in raise () from /lib/x86_64-linux-gnu/libc.so.6
(gdb) bt
#0 0x00007ff335664037 in raise () from /lib/x86_64-linux-gnu/libc.so.6
#1 0x00007ff335667698 in abort () from /lib/x86_64-linux-gnu/libc.so.6
#2 0x00007ff33565ce03 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
#3 0x00007ff33565ceb2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
#4 0x00007ff33426d164 in sna_dri_schedule_swap (client=0x7ff339c4bab0, draw=0x7ff33a09b140,
    front=0x7ff339cb1100, back=0x7ff339b97700, target_msc=0x7fffa3cb6a28, divisor=0, remainder=0,
    func=0x7ff337a7cef0, data=0x7ff33a09b140) at sna_dri.c:2140
#5 0x00007ff337a7c224 in DRI2SwapBuffers ()
#6 0x00007ff337a7d3b4 in ?? ()
#7 0x00007ff337952a41 in ?? ()
#8 0x00007ff33794154a in ?? ()
#9 0x00007ff33564eea5 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
#10 0x00007ff337941891 in _start ()
(gdb) git backtrace
Undefined command: "git". Try "help".
(gdb) backtrace full
#0 0x00007ff335664037 in raise () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#1 0x00007ff335667698 in abort () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#2 0x00007ff33565ce03 in ?? () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#3 0x00007ff33565ceb2 in __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#4 0x00007ff33426d164 in sna_dri_schedule_swap (client=0x7ff339c4bab0, draw=0x7ff33a09b140,
    front=0x7ff339cb1100, back=0x7ff339b97700, target_msc=0x7fffa3cb6a28, divisor=0, remainder=0,
    func=0x7ff337a7cef0, data=0x7ff33a09b140) at sna_dri.c:2140
        screen = <optimized out>
        scrn = <optimized out>
        sna = 0x7ff337828010
        vbl = {request = {
            type = (DRM_VBLANK_HIGH_CRTC_MASK | DRM_VBLANK_EVENT | DRM_VBLANK_NEXTONMISS | DRM_VBLANK_SECONDARY | unknown: 58884096), sequence = 32755, signal = 140682528728598}, reply = {
            type = (DRM_VBLANK_HIGH_CRTC_MASK | DRM_VBLANK_EVENT | DRM_VBLANK_NEXTONMISS | DRM_VBLANK_SECONDARY | unknown: 58884096), sequence = 32755, tval_sec = 140682528728598,
            tval_usec = 4230521311723520}}
        pipe = <optimized out>
        info = 0x0
        current_msc = 8
        __PRETTY_FUNCTION__ = "sna_dri_schedule_swap"
#5 0x00007ff337a7c224 in DRI2SwapBuffers ()
No symbol table info available.
#6 0x00007ff337a7d3b4 in ?? ()
No symbol table info available.
#7 0x00007ff337952a41 in ?? ()
No symbol table info available.
#8 0x00007ff33794154a in ?? ()
No symbol table info available.
#9 0x00007ff33564eea5 in __libc_start_main () from /lib/x86_64-linux-gnu/libc.so.6
No symbol table info available.
#10 0x00007ff337941891 in _start ()
No symbol table info available.