[Bug 47162] New: Screen went black for seconds, 100% cpu usage on dri2Throttle/sched_yield

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=47162

             Bug #: 47162
           Summary: Screen went black for seconds, 100% cpu usage on
                    dri2Throttle/sched_yield
    Classification: Unclassified
           Product: xorg
           Version: 7.4 (2008.09)
          Platform: x86-64 (AMD64)
        OS/Version: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/Radeon
        AssignedTo: xorg-driver-ati at lists.x.org
        ReportedBy: cyp561 at gmail.com
         QAContact: xorg-team at lists.x.org


Created attachment 58245
  --> https://bugs.freedesktop.org/attachment.cgi?id=58245
Backtrace from program that froze (used 100% of a cpu) after screen went black.

Only happened once, using a program that I often use, so probably not very
reproducible.

Screen went completely black for a few (2?) seconds.
When the screen went back to normal, the OpenGL program I was using was frozen
(not refreshing), and using 100% cpu.
I attached a debugger, and got a backtrace.
No debug info for /usr/lib64/dri/r600_dri.so, don't know why.

Not using compositing.

Linux version 2.6.39-gentoo (gcc version 4.4.6 (Gentoo 4.4.6-r1 p1.0,
pie-0.4.5) ) #3 SMP Fri Aug 26 20:15:20 CEST 2011

Using gentoo:
x11-base/xorg-drivers 1.11
x11-base/xorg-server 1.11.4
x11-drivers/radeon-ucode 20110531
x11-libs/libdrm 2.4.31

Part of glxinfo:
direct rendering: Yes
server glx vendor string: SGI
server glx version string: 1.4
client glx vendor string: Mesa Project and SGI
client glx version string: 1.4
OpenGL vendor string: X.Org
OpenGL renderer string: Gallium 0.4 on AMD RV710
OpenGL version string: 2.1 Mesa 8.0
OpenGL shading language version string: 1.20

Nothing in /var/log/Xorg.0.log.

dmesg:
radeon 0000:01:00.0: GPU lockup CP stall for more than 200213msec
------------[ cut here ]------------
WARNING: at drivers/gpu/drm/radeon/radeon_fence.c:246
radeon_fence_wait+0x247/0x2e5()
Hardware name: G31MX-S2
GPU lockup (waiting for 0x05A4BE07 last fence id 0x05A4BDFC)
Modules linked in:
Pid: 3297, comm: X Not tainted 2.6.39-gentoo #3
Call Trace:
 [<ffffffff810319c4>] warn_slowpath_common+0x80/0x98
 [<ffffffff81031a70>] warn_slowpath_fmt+0x41/0x43
 [<ffffffff812ef5be>] radeon_fence_wait+0x247/0x2e5
 [<ffffffff8104831d>] ? wake_up_bit+0x25/0x25
 [<ffffffff812efdde>] radeon_sync_obj_wait+0xc/0xe
 [<ffffffff812c13f6>] ttm_bo_wait+0xbc/0x151
 [<ffffffff812c205d>] ? ttm_bo_list_ref_sub+0x23/0x25
 [<ffffffff8130314c>] radeon_gem_wait_idle_ioctl+0x81/0xe8
 [<ffffffff812adf2c>] drm_ioctl+0x271/0x338
 [<ffffffff813030cb>] ? radeon_gem_set_tiling_ioctl+0x9d/0x9d
 [<ffffffff810b6925>] do_vfs_ioctl+0x42e/0x47d
 [<ffffffff810b69b6>] sys_ioctl+0x42/0x65
 [<ffffffff816b3c3b>] system_call_fastpath+0x16/0x1b
---[ end trace 8eb2c2cc05afbcd4 ]---
[drm] Disabling audio support
HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
radeon 0000:01:00.0: GPU softreset 
radeon 0000:01:00.0:   R_008010_GRBM_STATUS=0xA0021028
radeon 0000:01:00.0:   R_008014_GRBM_STATUS2=0x00000002
radeon 0000:01:00.0:   R_000E50_SRBM_STATUS=0x200000C0
radeon 0000:01:00.0:   R_008020_GRBM_SOFT_RESET=0x00007FEE
radeon 0000:01:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
radeon 0000:01:00.0:   R_008010_GRBM_STATUS=0x00003028
radeon 0000:01:00.0:   R_008014_GRBM_STATUS2=0x00000002
radeon 0000:01:00.0:   R_000E50_SRBM_STATUS=0x200000C0
radeon 0000:01:00.0: GPU reset succeed
radeon 0000:01:00.0: WB enabled
[drm] ring test succeeded in 1 usecs
[drm] ib test succeeded in 1 usecs
[drm] Enabling audio support
HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0

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