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

[Michael Tokarev]

Justin Piszcz wrote:
> # ps auxww | grep D
> USER       PID %CPU %MEM    VSZ   RSS TTY      STAT START   TIME COMMAND
> root       273  0.0  0.0      0     0 ?        D    Oct21  14:40 [pdflush]
> root       274  0.0  0.0      0     0 ?        D    Oct21  13:00 [pdflush]
> 
> After several days/weeks, this is the second time this has happened,
> while doing regular file I/O (decompressing a file), everything on the
> device went into D-state.

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.

/mjt
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