linux-ext4 - [Bug 13909] md5sum on 3GB file is constantly hanging

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Date:	Mon, 10 Aug 2009 18:21:24 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 13909] md5sum on 3GB file is constantly hanging

http://bugzilla.kernel.org/show_bug.cgi?id=13909

--- Comment #19 from Roland Kletzing <devzero@....de>  2009-08-10 18:21:23 ---
maybe running 

"strace md5sum bigfile 2>&1 | tail -n 25"
"strace dd if=bigfile of=/dev/null 2>&1 |tail -n 25"

gives some additional information where it gets stuck.
sorry if this information already hides in the stacktrace - i`m not familar
with reading those. 

also contents from 
/proc/sched_debug

and checking 
/proc/$PID_OF_STUCK_TASK/stat for increasing values (utime/stime/eip)

would perhaps give additional information.

to see if this is scheduling/smp issue, you could either boot with 'maxcpus=1'
into single cpu mode or start your tasks with cpu affinity "taskset -c 0
cmdname" or "taskset -c 1 cmdname". does that make any difference ?

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