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SubjectRe: 2.6.1 IO lockup on SMP systems
Sergey S. Kostyliov wrote:
> Hello Andrew,
>
> Now this happens for the third time.
>
>
>>>>I've just reproduced this lockup with 2.6.3.
>>>>
>>>>
>>>>>You may need a serial console to be able to capture all the output.
>>>>>
>>>>>Also, it would be useful to know what sort of load the machines are
>>>>>under, and what filesystems are in use.
>>>>
>>>>The machine is a http server. The main applications are:
>>>>1) apache 1.3 which serves php pages (mod_php):
>>>> 15.3 requests/sec - 111.9 kB/second - 7.3 kB/request
>>>> 54 requests currently being processed, 19 idle servers
>>>>2) mysql:
>>>> Threads: 19 Questions: 26922012 Slow queries: 9799 Opens: 64980
>>>> Flush tables: 1 Open tables: 630 Queries per second avg: 143.547
>>>>
>>>>This is an IO bound machine in general. All filesystems are reiserfs.
>>>>
>>>>Here is a sysrq-T output obtained from a locked box via serail console:
>>>
>>>OK, so everything is stuck trying to allocate memory. Perhaps you ran out
>>>of swapspace, or some process has gone berzerk allocating memory.
>
>
> The memory exhaustion is indeed possible for this box. I'll double check
> ulimit and /etc/security/limits.conf stuff. The only thing which worries
> me that this box had been running for months without any problems with
> 2.4.23aa1.
>
> I have added another 2Gb to swap space (hope this give enough time
> to find the memory hungry process(es)).

Also check how much memory is being used for slab in /proc/meminfo
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