[Bug 111415] BUG: kernel NULL pointer dereference - supervisor read access in kernel mode

[Bug 111415] BUG: kernel NULL pointer dereference - supervisor read access in kernel mode

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=111415

            Bug ID: 111415
           Summary: BUG: kernel NULL pointer dereference - supervisor read
                    access in kernel mode
           Product: DRI
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: tseewald@gmail.com

Created attachment 145088
  --> https://bugs.freedesktop.org/attachment.cgi?id=145088&action=edit
dmesg of freeze

Distribution: Fedora 30
Kernel: 5.2.8
Mesa: 19.1.4
GPU: RX 560

Problem:
While browsing the internet using Chromium my entire machine froze, it was
completely unresponsive to input but audio continued to play.


Snippet of BUG:

[173497.820810] BUG: kernel NULL pointer dereference, address: 00000000000002b4
[173497.820815] #PF: supervisor read access in kernel mode
[173497.820817] #PF: error_code(0x0000) - not-present page
[173497.820818] PGD 0 P4D 0 
[173497.820822] Oops: 0000 [#1] SMP PTI
[173497.820825] CPU: 2 PID: 21197 Comm: kworker/u8:2 Not tainted
5.2.8-200.fc30.x86_64 #1
[173497.820826] Hardware name: To Be Filled By O.E.M. To Be Filled By
O.E.M./Z77 Extreme4, BIOS P2.90 07/11/2013
[173497.820839] Workqueue: events_unbound commit_work [drm_kms_helper]
[173497.820953] RIP: 0010:dc_stream_log+0x6/0xb0 [amdgpu]

See attached dmesg for full message.

Let me know if you need any additional information.

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[Bug 111415] BUG: kernel NULL pointer dereference - supervisor read access in kernel mode

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https://bugs.freedesktop.org/show_bug.cgi?id=111415

--- Comment #1 from Tom Seewald <tseewald@gmail.com> ---
This bug report on the kernel bugtracker appears to be the same or at least a
very similar problem:
https://bugzilla.kernel.org/show_bug.cgi?id=204181

In that report, Nicholas Kazlauskas posted a possible fix:
https://patchwork.freedesktop.org/series/64505/

I have yet to test to see if this patch resolves the crashes I am experiencing,
but I don't see this as being in the 5.3-rc series, and certainly not in the
5.2 stable releases. Was this fix perhaps overlooked/missed?

So far I just see that it is in amd-staging-drm-next as of August 1st:
https://cgit.freedesktop.org/~agd5f/linux/commit/?h=amd-staging-drm-next&id=a4f6a4c7de97335f3452229e67521eae338af10e

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[Bug 111415] BUG: kernel NULL pointer dereference - supervisor read access in kernel mode

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=111415

Tom Seewald <tseewald@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #2 from Tom Seewald <tseewald@gmail.com> ---
The patches mentioned earlier have landed in 5.4 and 5.3.2, and after running
5.4-rc1 for several days now I have been unable to reproduce the crash.

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