Jens Axboe wrote:
Ok, can you try and reproduce with this one applied? It'll keep the
system running (unless there are other corruptions going on), so it
should help you a bit as well. It will dump some cfq state info when the
condition triggers that can perhaps help diagnose this. So if you can
apply this patch and reproduce + send the output, I'd much appreciate
it!
I think I'm wearing holes in my platters. This is being a swine to hit, but I finally got some..
It seems to respond to a combination of high cpu usage and relatively high disk utilisation.
I tried all sorts of acrobatics with multiple readers and hammering the array while reading from
individual drives..
The only reliable way I can reproduce this seems to be on a degraded array running a "while true ;
do md5sum -c md5 ; done" on about a 180GB directory of files. It is taking anywhere from 4 to 96
hours to hit it though.. but at least it's reproducible.
[105449.653682] cfq: rbroot not empty, but ->next_rq == NULL! Fixing up, report the issue to
[email protected]
[105449.683646] cfq: busy=1,drv=0,timer=0
[105449.694871] cfq rr_list:
[105449.702715] 3108: sort=0,next=00000000,q=0/1,a=1/0,d=0/0,f=69
[105449.720693] cfq busy_list:
[105449.729054] cfq idle_list:
[105449.737418] cfq cur_rr:
[115435.022192] cfq: rbroot not empty, but ->next_rq == NULL! Fixing up, report the issue to
[email protected]
[115435.052160] cfq: busy=1,drv=0,timer=0
[115435.063383] cfq rr_list:
[115435.071227] 3196: sort=0,next=00000000,q=0/1,a=1/0,d=0/0,f=69
[115435.089205] cfq busy_list:
[115435.097566] cfq idle_list:
[115435.105930] cfq cur_rr:
[115616.651883] cfq: rbroot not empty, but ->next_rq == NULL! Fixing up, report the issue to
[email protected]
[115616.681848] cfq: busy=1,drv=0,timer=0
[115616.693071] cfq rr_list:
[115616.700916] 3196: sort=0,next=00000000,q=0/1,a=1/0,d=0/0,f=61
[115616.718893] cfq busy_list:
[115616.727253] cfq idle_list:
[115616.735617] cfq cur_rr:
[119679.564753] cfq: rbroot not empty, but ->next_rq == NULL! Fixing up, report the issue to
[email protected]
[119679.594732] cfq: busy=1,drv=0,timer=0
[119679.605955] cfq rr_list:
[119679.613799] 3241: sort=0,next=00000000,q=0/1,a=1/0,d=0/0,f=69
[119679.631778] cfq busy_list:
[119679.640136] cfq idle_list:
[119679.648502] cfq cur_rr:
Brad
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