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

BERTRAND Joël
2007-11-04T13:40:55Z

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.

Same observation here (kernel 2.6.23). I can see this bug when I try to
synchronize a raid1 volume over iSCSI (each element is a raid5 volume),
or sometimes only with a 1,5 TB raid5 volume. When this bug occurs, md
subsystem eats 100% of one CPU and pdflush remains in D state too. What
is your architecture ? I use two 32-threads T1000 (sparc64), and I'm
trying to determine if this bug is arch specific.

Regards,

JKB