I did another sysrq dump and have attached the output. Again, 'iostat -dx 1' showed 100% utilization on the LVM which uses /dev/md0 as a pv and /sys/block/md0/md/stripe_cache_active was 29 and that value did not change. There were no error messages in /var/log/messages or 'dmesg'. My suspicions lie with md0 since the stripe_cache_active value remains at a fixed non-zero value even though all disks are (or appear to be) idle. Should I be looking elsewhere? This hardware did not exhibit this problem before "upgrading" from Fedora 15 to Fedora 16. Thank you, --Larkin On 1/8/2012 6:26 PM, NeilBrown wrote: > On Sun, 08 Jan 2012 16:03:10 -0600 Larkin Lowrey <llowrey@xxxxxxxxxxxxxxxxx> > wrote: > >> Suggestions? > > # echo t > /proc/sysrq-trigger > > and capture that messages that go to 'dmesg'. Post them. > > Hopefully your message ring buffer is big enough to collect the entire > output. If it isn't you might need to boot with > log_buf_len=1M > or similar. > > That should show what process is blocking on what. > > NeilBrown
<<attachment: deadlock.zip>>
