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