ubuntu-x-swat team mailing list archive

[David Eisner <deisner@xxxxxxxxx>]

I'm running into a similar problem with Karmic and the 855GM chipset.
I'll try some of the suggested fixes and report more detailed debugging
output later. I started having the problem upon upgrading to Karmic.
When the freeze occurs, it's when an OpenGL application, like a
screensaver, starts up, though only sometimes.  One way to reproduce the
problem is by running this from the shell:

  while [ 1 ]; do date; /usr/lib/xscreensaver/biof & sleep 5; pkill
biof; sleep 1;  done

Usually this will cause a freeze in ten or twenty iterations.  At this
point I ssh into my laptop and reboot.  When I check kern.log, I see
something like this shortly after the time of the freeze:

Jan  9 23:31:02 OUTOPIA kernel: [  720.432931] INFO: task biof:2570 blocked for more than 120 seconds.
Jan  9 23:31:02 OUTOPIA kernel: [  720.432938] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
Jan  9 23:31:02 OUTOPIA kernel: [  720.432946] biof          D c08145c0     0  2570   2482 0x00000004
Jan  9 23:31:02 OUTOPIA kernel: [  720.432958]  ebb61db4 00000086 eb9ce000 c08145c0 eb9f9bb8 c08145c0 1fad12dc 0000007f
Jan  9 23:31:02 OUTOPIA kernel: [  720.432979]  c08145c0 c08145c0 eb9f9bb8 c08145c0 00000000 0000007f c08145c0 db08f000
Jan  9 23:31:02 OUTOPIA kernel: [  720.432998]  eb9f9920 f68ebc14 f68ebc18 ffffffff ebb61de0 c056fc86 c031120e f68ebc1c
Jan  9 23:31:02 OUTOPIA kernel: [  720.433018] Call Trace:
Jan  9 23:31:02 OUTOPIA kernel: [  720.433030]  [<c056fc86>] __mutex_lock_slowpath+0xc6/0x130
Jan  9 23:31:02 OUTOPIA kernel: [  720.433043]  [<c031120e>] ? get_from_free_list+0x3e/0x50
Jan  9 23:31:02 OUTOPIA kernel: [  720.433054]  [<c056fba0>] mutex_lock+0x20/0x40
Jan  9 23:31:02 OUTOPIA kernel: [  720.433097]  [<f8224b77>] i915_gem_gtt_pwrite_fast+0x47/0x150 [i915]
Jan  9 23:31:02 OUTOPIA kernel: [  720.433150]  [<f81ad68b>] ? drm_gem_object_lookup+0x3b/0x50 [drm]
Jan  9 23:31:02 OUTOPIA kernel: [  720.433195]  [<f822672a>] i915_gem_pwrite_ioctl+0x1aa/0x1d0 [i915]
Jan  9 23:31:02 OUTOPIA kernel: [  720.433208]  [<c015f193>] ? hrtimer_forward+0x163/0x1b0
Jan  9 23:31:02 OUTOPIA kernel: [  720.433262]  [<f81ac6c0>] drm_ioctl+0x180/0x360 [drm]
Jan  9 23:31:02 OUTOPIA kernel: [  720.433308]  [<f8226580>] ? i915_gem_pwrite_ioctl+0x0/0x1d0 [i915]
Jan  9 23:31:02 OUTOPIA kernel: [  720.433321]  [<c0150146>] ? run_timer_softirq+0x156/0x200
Jan  9 23:31:02 OUTOPIA kernel: [  720.433337]  [<c013387d>] ? __enqueue_entity+0x9d/0xc0
Jan  9 23:31:02 OUTOPIA kernel: [  720.433349]  [<c0133231>] ? __dequeue_entity+0x21/0x40
Jan  9 23:31:02 OUTOPIA kernel: [  720.433367]  [<c01f51f3>] vfs_ioctl+0x73/0x90
Jan  9 23:31:02 OUTOPIA kernel: [  720.433379]  [<c01f54c1>] do_vfs_ioctl+0x71/0x310
Jan  9 23:31:02 OUTOPIA kernel: [  720.433390]  [<c01f57bf>] sys_ioctl+0x5f/0x80
Jan  9 23:31:02 OUTOPIA kernel: [  720.433401]  [<c010336c>] syscall_call+0x7/0xb

More to follow.

-- 
[i855] [karmic] X freezes with intel 855GM/82945G videocard
https://bugs.launchpad.net/bugs/476817
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