[Bug 276476] Re: Idle-priority scheduling bug blocks tasks

[Brian Rogers]

** Description changed:

- The following commits can be cleanly cherry-picked into 2.6.28 to fix this bug:
- cce7ade803699463ecc62a065ca522004f7ccb3d
- 6bc912b71b6f33b041cfde93ca3f019cbaa852bc
+ "INFO: task blocked for more than 120 seconds" is a diagnostic message
+ for when a process that wants to run is blocked from running for a long
+ time.
  
- Original description:
- Npviewer segfaults when visiting a website on Firefox with flash content. After that thunderbird, firefox stop responding and they have to be force quitted. Their processes (thunderbird.bin and firefox) can't be killed with kill -9 or killall. After a while these messages turn up on terminal: 
- 
- (taken from kern.log)
- Sep 30 22:37:19 ubuntu kernel: [19808.392380] INFO: task thunderbird-bin:28288 blocked for more than 120 seconds.
- Sep 30 22:37:19 ubuntu kernel: [19808.392418] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
- 
- I have to reboot using Sysreq + reisub.
- 
- This happens at least once a day on fully updated (as of 30.09.2008)
- Intrebid Ibex  on x86_64.
- 
- uname -a: Linux ubuntu 2.6.27-4-generic #1 SMP Wed Sep 24 01:29:06 UTC
- 2008 x86_64 GNU/Linux
- 
- Attached kern.log with relevant bits of two separate occasions.
+ This bug report refers to a specific problem with idle-priority
+ scheduling that has now been fixed. If you are up to date and are still
+ getting the "task blocked" message, it is a different bug, so please
+ file a new bug report.

-- 
Idle-priority scheduling bug blocks tasks
https://bugs.launchpad.net/bugs/276476
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