Re: [PATCH] drm/i915: Fix syncmap memory leak

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On 7/30/2021 12:53, Matthew Brost wrote:
A small race exists between intel_gt_retire_requests_timeout and
intel_timeline_exit which could result in the syncmap not getting
free'd. Rather than work to hard to seal this race, simply cleanup the
free'd -> freed

syncmap on fini.

unreferenced object 0xffff88813bc53b18 (size 96):
   comm "gem_close_race", pid 5410, jiffies 4294917818 (age 1105.600s)
   hex dump (first 32 bytes):
     01 00 00 00 00 00 00 00 00 00 00 00 0a 00 00 00  ................
     00 00 00 00 00 00 00 00 6b 6b 6b 6b 06 00 00 00  ........kkkk....
   backtrace:
     [<00000000120b863a>] __sync_alloc_leaf+0x1e/0x40 [i915]
     [<00000000042f6959>] __sync_set+0x1bb/0x240 [i915]
     [<0000000090f0e90f>] i915_request_await_dma_fence+0x1c7/0x400 [i915]
     [<0000000056a48219>] i915_request_await_object+0x222/0x360 [i915]
     [<00000000aaac4ee3>] i915_gem_do_execbuffer+0x1bd0/0x2250 [i915]
     [<000000003c9d830f>] i915_gem_execbuffer2_ioctl+0x405/0xce0 [i915]
     [<00000000fd7a8e68>] drm_ioctl_kernel+0xb0/0xf0 [drm]
     [<00000000e721ee87>] drm_ioctl+0x305/0x3c0 [drm]
     [<000000008b0d8986>] __x64_sys_ioctl+0x71/0xb0
     [<0000000076c362a4>] do_syscall_64+0x33/0x80
     [<00000000eb7a4831>] entry_SYSCALL_64_after_hwframe+0x44/0xa9

Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
Fixes: 531958f6f357 ("drm/i915/gt: Track timeline activeness in enter/exit")
Cc: <stable@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/gt/intel_timeline.c | 9 +++++++++
  1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_timeline.c b/drivers/gpu/drm/i915/gt/intel_timeline.c
index c4a126c8caef..1257f4f11e66 100644
--- a/drivers/gpu/drm/i915/gt/intel_timeline.c
+++ b/drivers/gpu/drm/i915/gt/intel_timeline.c
@@ -127,6 +127,15 @@ static void intel_timeline_fini(struct rcu_head *rcu)
i915_vma_put(timeline->hwsp_ggtt);
  	i915_active_fini(&timeline->active);
+
+	/*
+	 * A small race exists between intel_gt_retire_requests_timeout and
+	 * intel_timeline_exit which could result in the syncmap not getting
+	 * free'd. Rather than work to hard to seal this race, simply cleanup
+	 * the syncmap on fini.
What is the race? I'm going round in circles just trying to work out how intel_gt_retire_requests_timeout is supposed to get to intel_timeline_exit in the first place.

Also, free'd -> freed.

John.


+	 */
+	i915_syncmap_free(&timeline->sync);
+
  	kfree(timeline);
  }




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