Comment 288 for bug 620074
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7020100
(Get the code!)
Created attachment 20656
vmstat with high # of uninterruptible processes
I just had a hang for about 10-15 minutes. My system started to freeze, so I immediately switched to a console, and ran "vmstat 1" (see attachment).
I sat there and watched it, as I wanted to catch it immediately after it became usable again, so that I could check the load average.
uptime
23:38:18 up 6 days, 4:49, 8 users, load average: 23.30, 26.12, 16.21
23, with a 5 minute load average of 26 OUCH.
I have no swap, and I think the problem happened when one of my processes did something to lock up the machine. But, take note how many processes are blocked in UNINTERRUPTIBLE sleep at various times...
I think I also realized something very interesting about this bug. It does not occur as readily when you have a fast disk. As I had mentioned in previous comments, my macbook and my D820 have the same hardware. Well I'm rarely experiencing this on my D820 now. The only difference I can see, related to IO, is that the D820 just had a 320G 80M/s drive put into it. My Macbook runs at approximately 20-25M/s.
Also, given that I am pretty sure that one of my processes hanged the machine, it seems (though I am not a kernel hacker) like this bug may be related to a wait on a mutex or semaphore in a location that it should not be, hence the high number of uninterruptible processes? Could that be?