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Subject[BUG] 2.4.17 kills processes in shrink_cache
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Hello kernel maintainers,

1st, please Cc me in reply.

I encounter the following kernel error using stock kernel.org 2.4.17:

kernel BUG at vmscan.c:360!
invalid operand: 0000
CPU: 0
EIP: 0010:[shrink_cache+206/764] Not tainted
EIP: 0010:[<c01293f2>] Not tainted
EFLAGS: 00010282
eax: 0000001c ebx: c106cf9c ecx: 00000001 edx: 000026da
esi: c106cf80 edi: 0000000b ebp: 0000022e esp: c1171f2c
ds: 0018 es: 0018 ss: 0018
Process kswapd (pid: 5, stackpage=c1171000)
Stack: c0216359 00000168 c11030b0 c1170000 0000003a 000001d0 c02548c8 c11030b0
c3603d80 c02546a0 00000000 00000020 000001d0 00000006 00000020 c0129752
00000006 0000002e c02548c8 00000006 000001d0 c02548c8 00000000 c01297b4
Call Trace: [shrink_caches+78/128] [try_to_free_pages+48/76] [kswapd_balance_pgdat+69/144] [kswapd_balance+18/44] [kswapd+149/176]
Call Trace: [<c0129752>] [<c01297b4>] [<c0129845>] [<c01298a2>] [<c01299b9>]
[kswapd+0/176] [_stext+0/40] [kernel_thread+38/48] [kswapd+0/176]
[<c0129924>] [<c0105000>] [<c010567a>] [<c0129924>]

Code: 0f 0b 5a 59 8b 03 8b 53 04 89 50 04 89 02 a1 40 0f 2b c0 89
<7>PPP: VJ decompression error

When this error occur, it happens very quickly on many more processes
(a totoal of 20 process, both kernel & user), killing them all, with
the same "kernel BUG" prefix. Of course, the machine ends-up in a
very bad state & I have to use the magic SysRq to sync it & reboot it.

Looking on various linux-kernel ML archives, I found that the VM is
having some troubles, but no failure with the same backtrace as the
one I have, whereas I always have exactly the same one, at least on
the 2 lowest levels:

[shrink_caches+78/128]
[try_to_free_pages+48/76]
differences from here:
[balance_classzone+102/576]
[__alloc_pages+258/348]
[read_swap_cache_async+92/152]
[swapin_readahead+55/68]
[do_swap_page+43/220]
[handle_mm_fault+107/192]
[set_termios+368/380]
[do_page_fault+363/1140]
[tty_check_change+63/120]

My box is a K6 200 with 64Mb cache, ~800Mb swap. It is my mail,news &
web proxy. It also does IP masquerading.

Anything else I can provide to you?

--
François-Xavier 'FiX' KOWALSKI

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