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SubjectRe: 2.6.1 IO lockup on SMP systems
"Sergey S. Kostyliov" <rathamahata@php4.ru> wrote:
>
> Yet another lockup has just occurred. I could be wrong but from the
> /proc/meminfo content it doesn't looks like memory leak (neither kernel
> nor userspace), doesn't it?

I think it's a kernel leak.

> Thu Feb 26 05:00:15 MSK 2004
> MemTotal: 2073868 kB
> MemFree: 2528 kB
> Buffers: 2180 kB
> Cached: 34216 kB
> SwapCached: 643808 kB
> Active: 999316 kB
> Inactive: 12088 kB
> HighTotal: 1179648 kB
> HighFree: 576 kB
> LowTotal: 894220 kB
> LowFree: 1952 kB
> SwapTotal: 3583968 kB
> SwapFree: 2559796 kB
> Dirty: 0 kB
> Writeback: 3052 kB
> Mapped: 1001208 kB
> Slab: 23932 kB
> Committed_AS: 1979784 kB
> PageTables: 4840 kB
> VmallocTotal: 114680 kB
> VmallocUsed: 7448 kB
> VmallocChunk: 107232 kB

A gig of mapped memory, most of it in swapcache. That's probably all
highmem. Only a gig of memory on the page LRU. Where is the rest? Lost.

Almost no pagecache at all, slab is small.

> 3) sysrq-T:
> ===========
> http://sysadminday.org.ru/2.6.3-lockup/20040226/sysrq-T

hm, you have 34 instances of crond running. How odd.

> 3) `vmstat 30':
> ===============
> procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu----
> r b swpd free buff cache si so bi bo in cs us sy id wa
> 0 19 1255096 1952 1996 19920 426 1763 505 1778 1068 172 0 1 0 99
> 0 24 1260156 1944 2028 19816 374 1650 463 1670 1067 165 0 1 0 99

Again, all your memory has vanished.

I'd say that we've leaked everything in lowmem and everyone is stuck trying
to reclaim some lowmem memory. Not sure why the oom-killer didn't do
anything. I haven't tested it in a year - maybe it broke.

So. What are you using which is different from everyone else? DAC960 I
see. What about firewall setups, NIC drivers, RAID/MD/etc? Anything in
there which isn't a mainstream thing?

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