Re: High FS Activity Crash

From: Joshua Kwan (joshk@mspencer.net)
Date: Mon Jan 06 2003 - 23:02:30 EST

If the disk is churning and churning, that could be why. Upgrade to a
kernel that has a low latency elevator that makes sure disk thrashing
doesn't kill system performance.

I use 2.4.20-ck2 on my server :)

Regards
Josh

Rabid cheeseburgers forced Adam Voigt<adam@cryptocomm.com> to write this
on 06 Jan 2003 09:05:40-0500:

> Ok, on my fileserver I'm running Redhat 7.2 with Redhat kernel
> 2.4.7-10 and when I have a large number of people downloading from me
> at one time, Samba, ProFTPD, Apache, and SSH all stop responding, and
> I get the following in my log, the only thing special I could think
> about my setup is I have 3 NIC's bonded together to be load balanced
> on the same IP, any ideas?
>
> Jan 6 00:42:39 anubis kernel: Unable to handle kernel NULL pointer
> dereference at virtual address 00000024
> Jan 6 00:42:39 anubis kernel: printing eip:
> Jan 6 00:42:39 anubis kernel: c0135cb0
> Jan 6 00:42:39 anubis kernel: *pde = 00000000
> Jan 6 00:42:39 anubis kernel: Oops: 0002
> Jan 6 00:42:39 anubis kernel: CPU: 0
> Jan 6 00:42:39 anubis kernel: EIP:
> 0010:[__remove_from_lru_list+32/112]
> Jan 6 00:42:39 anubis kernel: EIP: 0010:[<c0135cb0>]
> Jan 6 00:42:39 anubis kernel: EFLAGS: 00010286
> Jan 6 00:42:39 anubis kernel: eax: 00000000 ebx: ce310cc0 ecx:
> ce310cc0 edx: c9b708c0
> Jan 6 00:42:39 anubis kernel: esi: ce310cc0 edi: ce310cc0 ebp:
> 00000000 esp: c1427f28
> Jan 6 00:42:39 anubis kernel: ds: 0018 es: 0018 ss: 0018
> Jan 6 00:42:39 anubis kernel: Process kswapd (pid: 5,
> stackpage=c1427000)
> Jan 6 00:42:39 anubis kernel: Stack: c0135d8d ce310cc0 00000000
> c0138890 ce310cc0 00000003 c1690800 c13f4a64
> Jan 6 00:42:39 anubis kernel: 00000080 c012cc6a 00000000
> c13f4a64 00000000 00000007 c012cfe3 c13f4a64
> Jan 6 00:42:39 anubis kernel: 00000080 00000000 00000000
> 0000000d 000093b6 00000000 c0243600 00000000
> Jan 6 00:42:39 anubis kernel: Call Trace:
> [__remove_from_queues+45/48][try_to_free_buffers+112/272]
> [try_to_release_page+58/96][do_page_launder+851/2112]
> [page_launder+40/96] Jan 6 00:42:39 anubis kernel: Call Trace:
> [<c0135d8d>] [<c0138890>][<c012cc6a>] [<c012cfe3>] [<c012d4f8>]
> Jan 6 00:42:39 anubis kernel: [do_try_to_free_pages+18/96]
> [kswapd+94/272] [_stext+0/48] [_stext+0/48] [kernel_thread+38/48]
> [kswapd+0/272]
> Jan 6 00:42:39 anubis kernel: [<c012d922>] [<c012d9ce>]
> [<c0105000>][<c0105000>] [<c0105716>] [<c012d970>]
> Jan 6 00:42:39 anubis kernel:
> Jan 6 00:42:39 anubis kernel: Code: 89 50 24 8b 44 24 08 8d 14 85 00
> 00 00 00 39 8a 6c 21 2b c0
>
> --
> Adam Voigt (adam@cryptocomm.com)
> The Cryptocomm Group
> My GPG Key: http://64.238.252.49:8080/adam_at_cryptocomm.asc
> 

-- 
Joshua Kwan
joshk@mspencer.net
pgp public key at http://joshk.mspencer.net/pubkey_gpg.asc
 
It's hard to keep your shirt on when you're getting something off your
chest.
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