dri-devel.lists.freedesktop.org archive mirror
 help / color / mirror / Atom feed
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, 26 Jul 2020 18:40:55 +0000	[thread overview]
Message-ID: <bug-207383-2300-zSXBhK7kGU@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 #95 from Nicholas Kazlauskas (nicholas.kazlauskas@amd.com) ---
Created attachment 290583
  --> https://bugzilla.kernel.org/attachment.cgi?id=290583&action=edit
0001-drm-amd-display-Force-add-all-CRTCs-to-state-when-us.patch

So the sequence looks like the following:

1. Non-blocking commit #1 requested, checked, swaps state and deferred to work
queue.

2. Non-blocking commit #2 requested, checked, swaps state and deferred to work
queue.

Commits #1 and #2 don't touch any of the same core DRM objects (CRTCs, Planes,
Connectors) so Commit #2 does not stall for Commit #1. DRM Private Objects have
always been avoided in stall checks, so we have no safety from DRM core in this
regard.

3. Due to system load commit #2 executes first and finishes its commit tail
work. At the end of commit tail, as part of DRM core, it calls
drm_atomic_state_put().

Since this was the pageflip IOCTL we likely already dropped the reference on
the state held by the IOCTL itself. So it's going to actually free at this
point.

This eventually calls drm_atomic_state_clear() which does the following:

obj->funcs->atomic_destroy_state(obj, state->private_objs[i].state);

Note that it clears "state" here. Commit sets "state" to the following:

state->private_objs[i].state = old_obj_state;
obj->state = new_obj_state;

Since Commit #1 swapped first this means Commit #2 actually does free Commit
#1's private object.

4. Commit #1 then executes and we get a use after free.

Same bug, it's just this was never corrupted before by the slab changes. It's
been sitting dormant for 5.0~5.8.

Attached is a patch that might help resolve this.

-- 
You are receiving this mail because:
You are watching the assignee of the bug.
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel

  parent reply	other threads:[~2020-07-26 18:41 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
2020-06-23 15:36 ` bugzilla-daemon
2020-06-23 23:41 ` bugzilla-daemon
2020-06-24  8:55 ` bugzilla-daemon
2020-06-27  4:37 ` bugzilla-daemon
2020-06-27  4:38 ` bugzilla-daemon
2020-06-27  5:16 ` bugzilla-daemon
2020-06-27  6:08 ` bugzilla-daemon
2020-06-27  7:07 ` bugzilla-daemon
2020-06-27 22:26 ` bugzilla-daemon
2020-06-28  1:12 ` bugzilla-daemon
2020-06-28 10:48 ` bugzilla-daemon
2020-06-28 15:30 ` bugzilla-daemon
2020-06-29  7:39 ` bugzilla-daemon
2020-06-29 22:09 ` bugzilla-daemon
2020-07-01 19:08 ` bugzilla-daemon
2020-07-04 19:57 ` bugzilla-daemon
2020-07-04 20:13 ` bugzilla-daemon
2020-07-05 16:58 ` bugzilla-daemon
2020-07-05 22:08 ` bugzilla-daemon
2020-07-06 16:24 ` bugzilla-daemon
2020-07-06 23:57 ` bugzilla-daemon
2020-07-07  0:37 ` bugzilla-daemon
2020-07-07  3:01 ` bugzilla-daemon
2020-07-07 11:01 ` bugzilla-daemon
2020-07-07 12:43 ` bugzilla-daemon
2020-07-07 15:27 ` bugzilla-daemon
2020-07-07 19:05 ` bugzilla-daemon
2020-07-08  0:25 ` bugzilla-daemon
2020-07-08  1:25 ` bugzilla-daemon
2020-07-08 20:16 ` bugzilla-daemon
2020-07-08 20:17 ` bugzilla-daemon
2020-07-09  7:45 ` bugzilla-daemon
2020-07-10  7:23 ` bugzilla-daemon
2020-07-10  7:36 ` bugzilla-daemon
2020-07-10  8:10 ` bugzilla-daemon
2020-07-10 10:55 ` bugzilla-daemon
2020-07-10 11:25 ` bugzilla-daemon
2020-07-10 14:31 ` bugzilla-daemon
2020-07-12  5:20 ` bugzilla-daemon
2020-07-12  5:47 ` bugzilla-daemon
2020-07-12  7:47 ` bugzilla-daemon
2020-07-14 23:36 ` bugzilla-daemon
2020-07-15 16:49 ` bugzilla-daemon
2020-07-15 17:12 ` bugzilla-daemon
2020-07-16  2:12 ` bugzilla-daemon
2020-07-16  6:37 ` bugzilla-daemon
2020-07-16  9:35 ` bugzilla-daemon
2020-07-16 10:24 ` bugzilla-daemon
2020-07-16 10:30 ` bugzilla-daemon
2020-07-16 10:32 ` bugzilla-daemon
2020-07-17 12:39 ` bugzilla-daemon
2020-07-20  2:20 ` bugzilla-daemon
2020-07-21 16:40 ` bugzilla-daemon
2020-07-21 16:57 ` bugzilla-daemon
2020-07-21 19:32 ` bugzilla-daemon
2020-07-21 20:33 ` bugzilla-daemon
2020-07-21 20:49 ` bugzilla-daemon
2020-07-21 20:56 ` bugzilla-daemon
2020-07-21 21:16 ` bugzilla-daemon
2020-07-22  2:03 ` bugzilla-daemon
2020-07-22  2:05 ` bugzilla-daemon
2020-07-22  3:37 ` bugzilla-daemon
2020-07-22  7:27 ` bugzilla-daemon
2020-07-22 13:04 ` bugzilla-daemon
2020-07-23  0:48 ` bugzilla-daemon
2020-07-23  5:46 ` bugzilla-daemon
2020-07-23 21:30 ` bugzilla-daemon
2020-07-23 21:34 ` bugzilla-daemon
2020-07-24  7:18 ` bugzilla-daemon
2020-07-24  7:24 ` bugzilla-daemon
2020-07-24 19:08 ` bugzilla-daemon
2020-07-24 21:00 ` bugzilla-daemon
2020-07-25  2:38 ` bugzilla-daemon
2020-07-26  6:47 ` bugzilla-daemon
2020-07-26 18:40 ` bugzilla-daemon [this message]
2020-07-26 19:55 ` bugzilla-daemon
2020-07-26 22:52 ` bugzilla-daemon
2020-07-26 23:30 ` bugzilla-daemon
2020-07-26 23:52 ` bugzilla-daemon
2020-07-27  6:11 ` bugzilla-daemon
2020-07-27 16:55 ` bugzilla-daemon
2020-07-28  2:29 ` bugzilla-daemon
2020-07-28  3:21 ` bugzilla-daemon
2020-07-28  3:39 ` bugzilla-daemon
2020-07-28  7:14 ` bugzilla-daemon
2020-07-29  2:33 ` bugzilla-daemon
2020-07-29  6:41 ` bugzilla-daemon
2020-07-29 16:02 ` bugzilla-daemon
2020-07-29 16:37 ` bugzilla-daemon
2020-07-29 16:45 ` bugzilla-daemon
2020-07-29 20:32 ` bugzilla-daemon
2020-07-31 16:38 ` bugzilla-daemon
2020-08-02  1:40 ` bugzilla-daemon
2020-08-02 13:06 ` bugzilla-daemon
2020-08-03 13:51 ` bugzilla-daemon
2020-08-05 16:10 ` bugzilla-daemon
2020-08-17  5:45 ` bugzilla-daemon
2021-01-06  6:36 ` bugzilla-daemon
2021-01-06 12:05 ` bugzilla-daemon
2021-01-06 18:59 ` bugzilla-daemon
2021-07-06  8:47 ` bugzilla-daemon

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=bug-207383-2300-zSXBhK7kGU@https.bugzilla.kernel.org/ \
    --to=bugzilla-daemon@bugzilla.kernel.org \
    --cc=dri-devel@lists.freedesktop.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).