Subject: Re: 3.2-rc6+: Reported regressions from 3.0 and 3.1

From: Markus Trippelsdorf <[email-masked]>
Date: Wed, 21 Dec 2011 07:45:37 +0100

On 2011.12.21 at 00:54 +0100, Rafael J. Wysocki wrote:
> Subject    : WARNING: at fs/sysfs/sysfs.h:195 (during boot)
> Submitter  : Markus Trippelsdorf <[email-masked]>
> Date       : 2011-11-13 19:24
> Message-ID : 201[email-masked]
> References : http://marc.info/?l=linux-kernel&m=132121231921932&w=2
> 
> Subject    : WARNING: at mm/slub.c:3357, kernel BUG at mm/slub.c:3413
> Submitter  : Markus Trippelsdorf <[email-masked]>
> Date       : 2011-11-18 7:25
> Message-ID : 201[email-masked]
> References : http://marc.info/?l=linux-kernel&m=132160119031794&w=2

Both entries were caused by the same Radeon kexec writeback bug. This issue
will hopefully be fixed in the next release.

> Subject    : Impossible high cpu-time values for migration threads
> Submitter  : Markus Trippelsdorf <[email-masked]>
> Date       : 2011-11-17 22:17
> Message-ID : 201[email-masked]
> References : http://marc.info/?l=linux-kernel&m=132156832124314&w=2

This is a cosmetic issue, but I'm still seeing this after bursts of high
CPU usage:

 % ps afx -F
UID        PID  PPID  C    SZ   RSS PSR STIME TTY      STAT   TIME CMD
root         2     0  0     0     0   1 Dec20 ?        S      0:00 [kthreadd]
root         3     2  0     0     0   0 Dec20 ?        S      0:01  \_ [ksoftirqd/0]
root         6     2  0     0     0   0 Dec20 ?        S      0:00  \_ [migration/0]
root         7     2  0     0     0   1 Dec20 ?        S      0:00  \_ [migration/1]
root         8     2  0     0     0   1 Dec20 ?        S      0:05  \_ [kworker/1:0]
root         9     2  0     0     0   1 Dec20 ?        S      0:01  \_ [ksoftirqd/1]
root        11     2  0     0     0   2 Dec20 ?        S      0:00  \_ [migration/2]
root        13     2  0     0     0   2 Dec20 ?        S      0:01  \_ [ksoftirqd/2]
root        14     2 22     0     0   3 Dec20 ?        S    192:21  \_ [migration/3]
root        16     2  0     0     0   3 Dec20 ?        S      0:01  \_ [ksoftirqd/3]
root        17     2  0     0     0   2 Dec20 ?        S<     0:00  \_ [khelper]
...

-- 
Markus