[lkml]   [2008]   [Sep]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: mount process looping on ext3 rw remount
On Fri, 5 Sep 2008 13:39:02 +0200 Marc Haber <> wrote:

> On Mon, Aug 25, 2008 at 06:35:28PM -0700, Andrew Morton wrote:
> > Please try to get a kernel profile while it's happening. oprofile
> > maybe, or just the plain old timer-based profiler. There's some info
> > in Documentation/basic_profiling.txt.
> I'll boot my next kernel with profile=2.
> > Actually, a simple alternative is to hit sysrq-P five or ten times.
> > Most of the resulting stack traces will point back at where the CPU is
> > stuck.
> Where are they written to? "P" in a sysrqd telnet session does not
> result in anything being written to the kernel log or to dmesg.

alt-sysrq-p from the attached keyboard.

When operating remotely, use `echo p > /proc/sysrq-trigger'.

The output will be in /var/log/messages and is accessible via
`dmesg -s 1000000'.

Please avoid email client wordwrapping when sending these logs. 99% of
people do this and it makes the text very hard to read.

> > This gets a bit hit-or-miss if you have multiple CPUs, because the
> > sysrq-p trace can land on the wrong CPU. We recently added a sysrq-l
> > which will generate a trace on all CPUS.
> "l" results in the SysRq HELP being written to the kernel log, so I
> guess that "recently" means "not yet in".


 \ /
  Last update: 2008-09-05 20:25    [W:0.042 / U:11.196 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site