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tests/gem_userptr_blits: Race between object creation and multi-threaded mm ops

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Userptr v23 was not thread safe against memory map operations and object
creation from separate threads. MMU notifier callback would get triggered
on a partially constructed object causing a NULL pointer dereference.

This test excercises that path a bit. In my testing it would trigger it
every time and easily, but unfortunately a test pass here does not guarantee
the absence of the race.

v2: Added explicit cancellation point and removed the stop flag.
    Use only igt_assert().

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Tvrtko Ursulin
2014-07-14 14:19:17 +01:00
committed by Daniel Vetter
parent 3f50598fb7
commit abbfecb015
2 changed files with 53 additions and 0 deletions
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tests/Makefile.am
+2
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@@ -65,6 +65,8 @@ prime_self_import_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
prime_self_import_LDADD = $(LDADD) -lpthread
gen7_forcewake_mt_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
gen7_forcewake_mt_LDADD = $(LDADD) -lpthread
gem_userptr_blits_CFLAGS = $(AM_CFLAGS) $(THREAD_CFLAGS)
gem_userptr_blits_LDADD = $(LDADD) -lpthread
gem_wait_render_timeout_LDADD = $(LDADD) -lrt
kms_flip_LDADD = $(LDADD) -lrt -lpthread