Debbuging a hung filesystem

Hi misc@,

Fully patched 7.8 on amd64.

I'm having some troubles with a filesystem that I have mounted. It's on
the same disk as everything else. The disk just passed a SMART test.
There's no dmesg errors. Other partitions seem to be fine.

I just remounted the partition with userquota -- maybe that's related?

Anything like ls /files/more/ will sit and hang in D state.

For example:

root 61851 0.0 0.0 884 424 p3 D+p 2:40AM 0:00.00 ls /files/more/
root 70837 0.0 0.0 884 428 p4 D+p 2:42AM 0:00.00 ls /files/more/parsnip

# fstat | grep /files/more
root ksh 25124 3 /files/more 2 drwxr-xr-x rep 512

fstat /files/more hangs as well.

I can't kill or even kill -9 anything in D state, it seems.

This is the partition mount information:

/dev/sd0o on /files/more type ffs (local, noatime, nodev, noexec, nosuid, with quotas, synchronous)

# ps aux | grep D+
root 25124 0.0 0.0 1688 1088 p0 D+p 2:16AM 0:00.30 -ksh (ksh)
root 55327 0.0 0.0 1432 1064 p2 D+p 2:40AM 0:00.04 -ksh (ksh)
root 61851 0.0 0.0 884 424 p3 D+p 2:40AM 0:00.00 ls /files/more/
root 70837 0.0 0.0 884 428 p4 D+p 2:42AM 0:00.00 ls /files/more/parsnip
root 2293 0.0 0.0 516 1108 p7 D+ 2:47AM 0:00.01 fstat /files/more
root 56370 0.0 0.0 120 320 p8 R+/0 2:50AM 0:00.00 grep D+

Not sure where to go from here.

Thanks!

-Henrich