Bug 50443

The bug occurs with all the paginated surfaces. It looks like a snapshot bug.

(gdb) bt
#0  __lll_lock_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:132
#1  0x00007ffff787f065 in _L_lock_858 () from /lib/x86_64-linux-gnu/libpthread.so.0
#2  0x00007ffff787eeba in __pthread_mutex_lock (mutex=0x77a980) at pthread_mutex_lock.c:61
#3  0x00007ffff7b1d27c in _cairo_surface_snapshot_get_target (surface=0x77a840) at cairo-surface-snapshot-inline.h:54
#4  0x00007ffff7b1d4de in _cairo_surface_snapshot_get_extents (abstract_surface=0x77a840, extents=0x7fffffffc480) at cairo-surface-snapshot.c:138
#5  0x00007ffff7b16780 in _cairo_surface_get_extents (surface=0x77a840, extents=0x7fffffffc480) at cairo-surface.c:2296
#6  0x00007ffff7af4f3c in _surface_is_clear (pattern=0x77a718) at cairo-pattern.c:3207
#7  0x00007ffff7af52df in _cairo_pattern_is_clear (abstract_pattern=0x77a718) at cairo-pattern.c:3317
#8  0x00007ffff7b15e76 in nothing_to_do (surface=0x77a9f0, op=CAIRO_OPERATOR_OVER, source=0x77a718) at cairo-surface.c:1935
#9  0x00007ffff7b15f54 in _cairo_surface_paint (surface=0x77a9f0, op=CAIRO_OPERATOR_OVER, source=0x77a718, clip=0x77a050) at cairo-surface.c:1971
#10 0x00007ffff7b1f021 in _cairo_surface_wrapper_paint (wrapper=0x7fffffffc740, op=CAIRO_OPERATOR_OVER, source=0x77a718, clip=0x77a660)
    at cairo-surface-wrapper.c:165
#11 0x00007ffff7b02f41 in _cairo_recording_surface_replay_internal (surface=0x7797b0, surface_extents=0x0, surface_transform=0x0, target=0x77a9f0, 
    target_clip=0x0, type=CAIRO_RECORDING_REPLAY, region=CAIRO_RECORDING_REGION_ALL) at cairo-recording-surface.c:1358
#12 0x00007ffff7b03790 in _cairo_recording_surface_replay (surface=0x7797b0, target=0x77a9f0) at cairo-recording-surface.c:1581
#13 0x00007ffff7b028f1 in _cairo_recording_surface_snapshot (abstract_other=0x7797b0) at cairo-recording-surface.c:1134
#14 0x00007ffff7adf95f in _cairo_paginated_surface_snapshot (abstract_other=0x779640) at cairo-paginated-surface.c:667
#15 0x00007ffff7b1d568 in _cairo_surface_snapshot_copy_on_write (surface=0x77a840) at cairo-surface-snapshot.c:190
#16 0x00007ffff7b13df3 in _cairo_surface_detach_snapshot (snapshot=0x77a840) at cairo-surface.c:347
#17 0x00007ffff7b13d61 in _cairo_surface_detach_snapshots (surface=0x779640) at cairo-surface.c:332
#18 0x00007ffff7b13ffd in _cairo_surface_begin_modification (surface=0x779640) at cairo-surface.c:395
#19 0x00007ffff7b1591b in INT_cairo_surface_set_device_offset (surface=0x779640, x_offset=0, y_offset=0) at cairo-surface.c:1675
#20 0x0000000000471d90 in _cairo_boilerplate_pdf_finish_surface (surface=0x779640) at cairo-boilerplate-pdf.c:131
#21 0x000000000040bd02 in cairo_test_for_target (ctx=0x7fffffffcde0, target=0x7649e0, dev_offset=0, similar=0) at cairo-test.c:988
#22 0x000000000040d00a in _cairo_test_context_run_for_target (ctx=0x7fffffffcde0, target=0x7649e0, similar=0, dev_offset=0) at cairo-test.c:1526
#23 0x000000000040ddf0 in _cairo_test_runner_draw (runner=0x7fffffffcce0, ctx=0x7fffffffcde0, target=0x7649e0, similar=0, device_offset=0)
    at cairo-test-runner.c:254
#24 0x000000000040f59e in main (argc=1, argv=0x7fffffffe028) at cairo-test-runner.c:918
(gdb)

commit 8020e0bc8cbd3e5ac188eb305b74ae1c1f362a31
Author: Chris Wilson <chris@chris-wilson.co.uk>
Date:   Wed Oct 3 17:01:41 2012 +0100

    recording: Perform an explicit during snapshot
    
    In order to avoid recursing upon our source mutex when doing a snapshot,
    we can perform an explicit copy of the command array. This should also
    be faster than performing a replay as well.
    
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=50443
    Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>