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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: Sun, 28 Jun 2020 10:48:15 +0000	[thread overview]
Message-ID: <bug-207383-2300-cKeiG0LUSd@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-207383-2300@https.bugzilla.kernel.org/>

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

Duncan (1i5t5.duncan@cox.net) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
     Kernel Version|5.7-rc1, 5.7-rc2, 5.7-rc3   |5.7-rc1 - 5.7 - 5.8-rc1+

--- Comment #31 from Duncan (1i5t5.duncan@cox.net) ---
(In reply to mnrzk from comment #30)
> In some conditions, when amdgpu_dm_atomic_commit_tail calls
> dm_atomic_get_new_state, dm_atomic_get_new_state returns a struct
> dm_atomic_state* with an garbage context pointer.

Good! Someone with the bug who can actually read and work the code, now.
Portends well for a fix.  =:^)

> I've also found that this bug exclusively occurs when commit_work is on the
> workqueue. After forcing drm_atomic_helper_commit to run all of the commits
> without adding to the workqueue and running the OS, the issue seems to have
> disappeared.

I see it always with the workqueue too, but not being a dev I simply assumed
that was how it was; I had no idea it could be taken off the workqueue.

> The system was stable for at least 1.5 hours before I manually
> shut it down (meanwhile it has usually crashed within 30-45 minutes).

You're seeing a crash much faster than I am.  I believe my longest uptime
before a crash with the telltale trace was something like two and a half days,
with the obvious implications for bisect good since it's always a gamble that
I've simply not tested long enough.

> Perhaps there's some sort of race condition occurring after commit_work is
> queued?

Agreed, FWIW, tho you've taken it farther than I could, not being able to work
with code much beyond bisect or modifying an existing patch here or there.

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  parent reply	other threads:[~2020-06-28 10:48 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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2021-01-06  6:36 ` bugzilla-daemon
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2021-07-06  8:47 ` bugzilla-daemon

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