[Bug 96445] [amdgpu][tonga] display freezes soon after X start

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96445

            Bug ID: 96445
           Summary: [amdgpu][tonga] display freezes soon after X start
           Product: DRI
           Version: DRI git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/AMDgpu
          Assignee: dri-devel at lists.freedesktop.org
          Reporter: csaba.halasz at gmail.com

Starting X and just trying to do general stuff leads to display freeze within
minutes. Most of the time nothing in syslog but during bisecting I have at
least once seen this message which might be unrelated:

[drm:process_one_work] *ERROR* ring sdma1 timeout, last signaled seq=144370,
last emitted seq=144370

Initially I got an RCU stall message:

 INFO: rcu_sched detected stalls on CPUs/tasks:
        3-...: (13593 GPs behind) idle=561/140000000000000/0 softirq=0/0
fqs=14996 
        5-...: (13593 GPs behind) idle=2e7/140000000000000/0 softirq=0/0
fqs=14996 
        (detected by 0, t=15002 jiffies, g=13293, c=13292, q=0)
 Task dump for CPU 3:
 sdma1           R  running task        0   499      2 0x00080008
  ffffffff810f83fb ffff8803e02de580 ffffffffa0333d01 ffff8800b9d1c110
  ffff8800b89a3c00 ffff8800b89a3cd8 0000000000000000 ffff8800b9d1c110
  ffffffffa036812b ffff8800b9fd58b8 ffffffff813c66bf ffff8800b9fd58b8
 Call Trace:
  [<ffffffff810f83fb>] ? kmem_cache_free+0xab/0xc0
  [<ffffffffa0333d01>] ? amdgpu_sync_get_fence+0x51/0xc0 [amdgpu]
  [<ffffffffa036812b>] ? amdgpu_job_dependency+0x2b/0xb0 [amdgpu]
  [<ffffffff813c66bf>] ? _raw_spin_lock_irqsave+0x1f/0x30
  [<ffffffffa0367643>] ? amd_sched_main+0x1a3/0x3f0 [amdgpu]
  [<ffffffff81077310>] ? add_wait_queue+0x60/0x60
  [<ffffffffa03674a0>] ? amd_sched_process_job+0x70/0x70 [amdgpu]
  [<ffffffff8105fbbc>] ? kthread+0xbc/0xe0
  [<ffffffff813c6b02>] ? ret_from_fork+0x22/0x40
  [<ffffffff8105fb00>] ? kthread_stop+0x70/0x70
 Task dump for CPU 5:
 kworker/5:1     R  running task        0   143      2 0x00080008
 Workqueue: events amd_sched_job_finish [amdgpu]
  ffff88043ed57900 0000000000000000 ffffffff81059ae2 0000000000000018
  ffff88042b4e0000 ffff88042b982d00 ffff88043ed53420 ffff88042b982d00
  ffff88042b982d00 ffff88043ed53400 ffff8800ba673d80 ffff8800ba673db0
 Call Trace:
  [<ffffffff81059ae2>] ? process_one_work+0x132/0x350
  [<ffffffff8105b3fe>] ? worker_thread+0x11e/0x430
  [<ffffffff8105b2e0>] ? create_worker+0x180/0x180
  [<ffffffff8105fbbc>] ? kthread+0xbc/0xe0
  [<ffffffff813c6b02>] ? ret_from_fork+0x22/0x40
  [<ffffffff8105fb00>] ? kthread_stop+0x70/0x70

During bisecting I probably did not wait long enough for this to show up
(apparently it's configured for 1 minute).
According to git bisect:

8df07daf3952b7606e2d17076198ec3fb38ab1f1 is the first bad commit
commit 8df07daf3952b7606e2d17076198ec3fb38ab1f1
Date:   Thu May 19 09:54:15 2016 +0200

    drm/amdgpu: fix and cleanup job destruction


kernel agd5f/drm-next-4.8-wip
mesa git 65c2abf6fdd51b0a80a72caa0c52cf3f4578e743
llvm git ef1f2996c17c9b1480201239002b58851810e8fc
xf86-video-amdgpu git 60ced5026ebc34d9f32c7618430b6a7ef7c8eb4b
Xorg 1.18.0
mplayer svn r37870
gigabyte 380 (tonga)

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