Re: X server hung, kernel said task blocked for 120 secs (2.6.30)

[Sanjoy Mahajan]

[Have been away for 10 days and just saw the message]

 I assume this is a regression?  Since 2.6.29?

I never saw it before using 2.6.30 and haven't been able to reproduce
it even running 2.6.30.  

So it could be a regression.  Or it could be a recurring problem (I had
a few X lockups with earlier kernels) now exposed by a blocked-task
timer (the INFO: task events/0:9 blocked for more than 120 seconds
message) -- if that notification code is new in 2.6.30?

-Sanjoy

`Until lions have their historians, tales of the hunt shall always
 glorify the hunters.'  --African Proverb

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Re: X server hung, kernel said task blocked for 120 secs (2.6.30)

[Eric Anholt]

On Wed, 2009-07-01 at 12:48 -0400, Sanjoy Mahajan wrote:
 [Have been away for 10 days and just saw the message]
 
  I assume this is a regression?  Since 2.6.29?
 
 I never saw it before using 2.6.30 and haven't been able to reproduce
 it even running 2.6.30.  
 
 So it could be a regression.  Or it could be a recurring problem (I had
 a few X lockups with earlier kernels) now exposed by a blocked-task
 timer (the INFO: task events/0:9 blocked for more than 120 seconds
 message) -- if that notification code is new in 2.6.30?

This message appears when the GPU is hung but somebody is still trying
to use it.  The problem is that the GPU is hung, not the presence of the
message (so you can't use the message to indicate any particular bug,
and the bug is almost always in userland).

-- 
Eric Anholt
e...@anholt.net eric.anh...@intel.com




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Re: X server hung, kernel said task blocked for 120 secs (2.6.30)

[Andrew Morton]

(cc dri-devel)

On Sun, 14 Jun 2009 21:46:05 -0400
Sanjoy Mahajan san...@mit.edu wrote:

 I'm running vanilla 2.6.30 on an otherwise Debian 'unstable' system -- a
 TP T60 with Intel graphics and wireless (no tainting).  The X server
 [xorg 1.6.1.901 (1.6.2 RC 1), intel driver 2.7.1] hung in a way that it
 often has with other versions: The mouse cursor moves around as normal,
 but the keyboard or mouse buttons don't do anything.  I used sysrq half
 competently to send TERM and KILL signals and then reboot.
 
 The log message below was in the /var/log/messages from when the problem
 happened.  Should I report this information to freedesktop.org or is it
 a kernel issue belonging on the bugzilla?
 
 [228600.676053] INFO: task events/0:9 blocked for more than 120 seconds.
 [228600.676058] echo 0  /proc/sys/kernel/hung_task_timeout_secs disables 
 this message.
 [228600.676061] events/0  D 31efa204 0 9  2
 [228600.676066]  c1bfc040 0046 f7121a60 31efa204 c0439040 c0436134 
 c0101f70 f708f0c0
 [228600.676075]  f708f274   f7121a8c c1bfc040  
 c011d842 c1bfc580
 [228600.676083]  f708f0c0 f708f274 0366353a f626cac0  c0439040 
 c02f19c2 c03a8300
 [228600.676090] Call Trace:
 [228600.676099]  [c0101f70] ? __switch_to+0xbf/0x140
 [228600.676105]  [c011d842] ? pick_next_task_fair+0x80/0x87
 [228600.676111]  [c02f19c2] ? __schedule+0x6f2/0x74d
 [228600.676115]  [c02f1fc4] ? __mutex_lock_common+0xe1/0x136
 [228600.676120]  [c02f2028] ? __mutex_lock_slowpath+0xf/0x11
 [228600.676123]  [c02f1e78] ? mutex_lock+0x10/0x1e
 [228600.676127]  [c02f1e78] ? mutex_lock+0x10/0x1e
 [228600.676133]  [c0133e97] ? queue_delayed_work_on+0x9c/0xa8
 [228600.676150]  [f8ff74f3] ? i915_gem_retire_work_handler+0x1c/0x4e [i915]
 [228600.676155]  [c0133701] ? worker_thread+0x13d/0x1bf
 [228600.676168]  [f8ff74d7] ? i915_gem_retire_work_handler+0x0/0x4e [i915]
 [228600.676174]  [c01365a6] ? autoremove_wake_function+0x0/0x2d
 [228600.676178]  [c01335c4] ? worker_thread+0x0/0x1bf
 [228600.676182]  [c01362b6] ? kthread+0x42/0x67
 [228600.676186]  [c0136274] ? kthread+0x0/0x67
 [228600.676190]  [c0103ab7] ? kernel_thread_helper+0x7/0x10
 [228611.402991] SysRq : Keyboard mode set to system default

I assume this is a regression?  Since 2.6.29?

Thanks.

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