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From: bugzilla-daemon@bugzilla.kernel.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 207383] [Regression] 5.7 amdgpu/polaris11 gpf: amdgpu_atomic_commit_tail
Date: Fri, 24 Jul 2020 21:00:07 +0000	[thread overview]
Message-ID: <bug-207383-2300-y1YFgtjUYS@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-207383-2300@https.bugzilla.kernel.org/>

https://bugzilla.kernel.org/show_bug.cgi?id=207383

--- Comment #92 from Nicholas Kazlauskas (nicholas.kazlauskas@amd.com) ---
This sounds very similar to a bug I fixed a year ago but that issue was with
freeing the dc_state.

https://bugzilla.kernel.org/show_bug.cgi?id=204181

1. Client requests non-blocking Commit #1, has a new dc_state #1,
state is swapped, commit tail is deferred to work queue

2. Client requests non-blocking Commit #2, has a new dc_state #2,
state is swapped, commit tail is deferred to work queue

3. Commit #2 work starts before Commit #1, commit tail finishes,
atomic state is cleared, dc_state #1 is freed

4. Commit #1 work starts after Commit #2, uses dc_state #1, NULL pointer deref.

This issue was fixed, but it occurred under similar conditions - heavy system
load and frequent pageflipping.

However, in the case of dm_state things can't be solved in the same manner.
Commit #2 can't free Commit #1's commit - only the commit tail for Commit #1
can free it along with the IOCTL caller.

I don't know if this is going down any of the deadlock paths in DRM core
because that might trigger strange behavior as well with clearing/putting the
dm_state.

If someone who can reproduce this issue can produce a dmesg log with the DRM
IOCTLs logged (I think drm.debug=0x54 should work) then I should be able to
examine the IOCTL sequence in more detail.

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  parent reply	other threads:[~2020-07-24 21:00 UTC|newest]

Thread overview: 122+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21  9:51 [Bug 207383] New: [Regression] 5.7-rc: amdgpu/polaris11 gpf: amdgpu_atomic_commit_tail bugzilla-daemon
2020-04-21  9:57 ` [Bug 207383] " bugzilla-daemon
2020-04-21 10:04 ` bugzilla-daemon
2020-04-23  4:59 ` bugzilla-daemon
2020-04-27 19:24 ` bugzilla-daemon
2020-04-27 19:42 ` bugzilla-daemon
2020-04-27 19:43 ` bugzilla-daemon
2020-05-01  8:20 ` bugzilla-daemon
2020-05-01  8:28 ` bugzilla-daemon
2020-05-02 16:03 ` bugzilla-daemon
2020-05-03 15:10 ` bugzilla-daemon
2020-05-05  4:23 ` bugzilla-daemon
2020-05-06 17:46 ` bugzilla-daemon
2020-05-06 22:06 ` bugzilla-daemon
2020-06-03  0:04 ` [Bug 207383] [Regression] 5.7 " bugzilla-daemon
2020-06-21  7:01 ` bugzilla-daemon
2020-06-22 15:20 ` bugzilla-daemon
2020-06-22 17:44 ` bugzilla-daemon
2020-06-22 17:57 ` bugzilla-daemon
2020-06-22 19:36 ` bugzilla-daemon
2020-06-22 20:00 ` bugzilla-daemon
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2020-06-23 23:41 ` bugzilla-daemon
2020-06-24  8:55 ` bugzilla-daemon
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