Re: 2.6.23.1: mdadm/raid5 hung/d-state

[Justin Piszcz <jpiszcz@lucidpixels.com>]

On Sun, 4 Nov 2007, Michael Tokarev wrote:

> Justin Piszcz wrote:
> > On Sun, 4 Nov 2007, Michael Tokarev wrote:
> []
> > > The next time you come across something like that, do a SysRq-T dump and
> > > post that.  It shows a stack trace of all processes - and in particular,
> > > where exactly each task is stuck.
>
> > Yes I got it before I rebooted, ran that and then dmesg > file.
> >
> > Here it is:
> >
> > [1172609.665902]  ffffffff80747dc0 ffffffff80747dc0 ffffffff80747dc0 ffffffff80744d80
> > [1172609.668768]  ffffffff80747dc0 ffff81015c3aa918 ffff810091c899b4 ffff810091c899a8
>
> That's only partial list.  All the kernel threads - which are most important
> in this context - aren't shown.  You ran out of dmesg buffer, and the most
> interesting entries was at the beginning.  If your /var/log partition is
> working, the stuff should be in /var/log/kern.log or equivalent.  If it's
> not working, there is a way to capture the info still, by stopping syslogd,
> cat'ing /proc/kmsg to some tmpfs file and scp'ing it elsewhere.
>
> /mjt

Will do that the next time it happens, thanks.
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