Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> writes: > [11057.642683] BUG: KCSAN: data-race in i915_gem_mmap [i915] / singleton_release [i915] > [11057.642717] > [11057.642740] write (marked) to 0xffff8881f24471a0 of 8 bytes by task 44668 on cpu 2: > [11057.643162] singleton_release+0x38/0x60 [i915] > [11057.643192] __fput+0x160/0x3c0 > [11057.643217] ____fput+0x16/0x20 > [11057.643241] task_work_run+0xba/0x100 > [11057.643263] exit_to_usermode_loop+0xe4/0xf0 > [11057.643286] do_syscall_64+0x27e/0x2c0 > [11057.643314] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > [11057.643339] > [11057.643359] read to 0xffff8881f24471a0 of 8 bytes by task 44667 on cpu 3: > [11057.643774] i915_gem_mmap+0x295/0x670 [i915] > [11057.643802] mmap_region+0x62b/0xac0 > [11057.643825] do_mmap+0x414/0x6b0 > [11057.643848] vm_mmap_pgoff+0xa9/0xf0 > [11057.643875] ksys_mmap_pgoff+0x1ac/0x2f0 > [11057.643900] do_syscall_64+0x6e/0x2c0 > [11057.643924] entry_SYSCALL_64_after_hwframe+0x44/0xa9 > > Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx> Reviewed-by: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx> > --- > drivers/gpu/drm/i915/gem/i915_gem_mman.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c > index e8cccc131c40..b39c24dae64e 100644 > --- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c > +++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c > @@ -775,7 +775,7 @@ static struct file *mmap_singleton(struct drm_i915_private *i915) > struct file *file; > > rcu_read_lock(); > - file = i915->gem.mmap_singleton; > + file = READ_ONCE(i915->gem.mmap_singleton); > if (file && !get_file_rcu(file)) > file = NULL; > rcu_read_unlock(); > -- > 2.20.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
