https://bugs.freedesktop.org/show_bug.cgi?id=108249
--- Comment #1 from Olivier Fourdan <[email protected]> ---
So, looking further into the backtrace, we see that:
(gdb) f 10
#10 present_wnmd_flip (damage=0xf4eee0, sync_flip=0, pixmap=0xf507a0,
target_msc=268904, event_id=1985548, crtc=0xaa85b0,
window=0xf4ee90) at present_wnmd.c:358
358 present_screen_priv_ptr screen_priv =
present_screen_priv(screen);
(gdb) p screen
$2 = (ScreenPtr) 0xf000000000034
(that's a bogus value ^^^)
That's coming from:
353 PixmapPtr pixmap,
354 Bool sync_flip,
355 RegionPtr damage)
356 {
357 ScreenPtr screen = crtc->pScreen;
358 present_screen_priv_ptr screen_priv =
present_screen_priv(screen);
359
And so is the RRCrtcPtr:
(gdb) p *crtc
$5 = {id = 0, pScreen = 0xf000000000034, mode = 0x63736e552f6b6447, x =
1684368481, y = 4804676, ...
So my guess is that the undock removes outputs, on resume Xwayland gets all the
events at once, the xwl_present_sync_callback() occurs after the
xwl_output_remove() has destroyed the xwl_output->randr_crtc so we're pointeing
at freed memory here.
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