[Bug 107300] [REGRESSION] NULL pointer dereference when waking up monitor - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 107300] [REGRESSION] NULL pointer dereference when waking up monitor
Date: Thu, 19 Jul 2018 21:41:19 +0000	[thread overview]
Message-ID: <bug-107300-502@http.bugs.freedesktop.org/> (raw)

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https://bugs.freedesktop.org/show_bug.cgi?id=107300

            Bug ID: 107300
           Summary: [REGRESSION] NULL pointer dereference when waking up
                    monitor
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel@lists.freedesktop.org
          Reporter: mr.nuke.me@gmail.com

Created attachment 140719
  --> https://bugs.freedesktop.org/attachment.cgi?id=140719&action=edit
dmesg

I'm noticing this with linux-17.6 on an RX 480, but did not experience this
problem with linux-4.16 and earlier.

I let the machine  without any input for a while, and it automatically puts the
monitor to sleep. To wake up the screen, I move the mouse or hit the keyboard.

About a third of the time, the login screen comes up, and there's no response.
SSH then dmesg points to an amazingly well crafted NULL pointer dereference in
[amdgpu].

Surprisingly, this isn't some 4billionk triple-gazillion monitor setup, which
I've always had driver issues with. This issue happens with a single display.

For fast access, this is the backtrace: 
[59233.951991] Call Trace:
[59233.952068]  dm_update_crtcs_state+0x26c/0x4d0 [amdgpu]
[59233.952140]  amdgpu_dm_atomic_check+0x1b1/0x3b0 [amdgpu]
[59233.952172]  drm_atomic_check_only+0x360/0x4f0 [drm]
[59233.952192]  drm_atomic_commit+0x13/0x50 [drm]
[59233.952211]  drm_atomic_connector_commit_dpms+0xdb/0x100 [drm]
[59233.952230]  drm_mode_obj_set_property_ioctl+0x178/0x280 [drm]
[59233.952249]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
[59233.952266]  drm_mode_connector_property_set_ioctl+0x39/0x60 [drm]
[59233.952283]  drm_ioctl_kernel+0x5b/0xb0 [drm]
[59233.952300]  drm_ioctl+0x1b3/0x370 [drm]
[59233.952318]  ? drm_mode_connector_set_obj_prop+0x80/0x80 [drm]
[59233.952375]  amdgpu_drm_ioctl+0x49/0x80 [amdgpu]
[59233.952382]  do_vfs_ioctl+0xa4/0x610
[59233.952386]  ksys_ioctl+0x60/0x90
[59233.952389]  __x64_sys_ioctl+0x16/0x20
[59233.952394]  do_syscall_64+0x5b/0x160
[59233.952399]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

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