dbench has intermittent hang on 2.6.0-test1-ac2
dbench 32 hang on 2.6.0-test2. /proc/PID/wchan shows dbench process in sys_pause, /proc/PPID/wchan shows other dbench in sys_wait4.
kill -CONT on the two dbench PIDs has the child wchan change to __pdflush, but the processes don't appear to continue, nor exit. After waiting a couple minutes, I did kill on both PIDs and dbench exited.
This was ext2 filesystem. Previous was ext3 and reiserfs.
sysrq t after "kill -CONT" is at:
http://home.earthlink.net/~rwhron/kernel/sysrq.txt
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Randy Hron http://home.earthlink.net/~rwhron/kernel/bigbox.html