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SubjectRe: 2.4.19 BUG in page_alloc.c:91
I can´t find a final conclusion about this topic.
What I found is that it happends some hours after the kernel killed a
process that was eating the memory.
Example:

Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 18432
(mozilla-bin).
Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 18443
(mozilla-bin).
Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 18444
(mozilla-bin).
Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 18445
(mozilla-bin).
Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 18447
(mozilla-bin).
Aug 26 13:07:22 ice kernel: Out of Memory: Killed process 30410
(mozilla-bin).
....
Aug 27 06:26:00 ice kernel: kernel BUG at page_alloc.c:91!
Aug 27 06:26:00 ice kernel: invalid operand: 0000
Aug 27 06:26:00 ice kernel: CPU: 0
Aug 27 06:26:00 ice kernel: EIP: 0010:[__free_pages_ok+45/624]
Tainted: P
Aug 27 06:26:00 ice kernel: EFLAGS: 00010286
Aug 27 06:26:00 ice kernel: eax: c103a528 ebx: c1105760 ecx:
c1105760 edx: c0228e9c
Aug 27 06:26:00 ice kernel: esi: 00000000 edi: 00000016 ebp:
0000005e esp: c7f93f18
Aug 27 06:26:00 ice kernel: ds: 0018 es: 0018 ss: 0018
Aug 27 06:26:00 ice kernel: Process kswapd (pid: 4, stackpage=c7f93000)
Aug 27 06:26:00 ice kernel: Stack: c22d28c0 c1105760 00000016 0000005e
c013755c c1105760 00000
1d0 00000016
Aug 27 06:26:00 ice kernel: 0000005e c0135a09 c22d28c0 c1105760
c012d482 c012e3fb c012d
4bb 00000020
Aug 27 06:26:00 ice kernel: 000001d0 00000020 00000006 00000006
c7f92000 000003a4 00000
1d0 c0229034
Aug 27 06:26:00 ice kernel: Call Trace: [try_to_free_buffers+140/224]
[try_to_release_page+
73/80] [shrink_cache+482/768] [__free_pages+27/32] [shrink_cache+539/768]
Aug 27 06:26:00 ice kernel: [shrink_caches+86/128]
[try_to_free_pages+60/96] [kswapd_balance
_pgdat+67/144] [kswapd_balance+22/48] [kswapd+157/192] [kernel_thread+40/64]

At 6:25 the cron started the regular locate data base update and other
tasks I guess it made the kernel reduce the size of the cache and fail.
I saw reports it happends with "non-tainted" kernels and with or without
nVidia driver, so perhaps that´s a real bug in the mechanism used by the
kernel to kill a process that is eating all the memory introduced in 2.4.19.
I can fill a full bug report but perhaps any of you know about the
conclusion of this thread and I´m just too stupid to find it.
Note that it doesn´t happend if the kernel doesn´t kill mozilla-bin for
days, when kernel kills this process is just a matter of hours before it
and from this point the cache size won´t be reduced.

SET

--
Salvador Eduardo Tropea (SET). (Electronics Engineer)
Visit my home page: http://welcome.to/SetSoft or
http://www.geocities.com/SiliconValley/Vista/6552/
Alternative e-mail: set@computer.org set@ieee.org
Address: Curapaligue 2124, Caseros, 3 de Febrero
Buenos Aires, (1678), ARGENTINA Phone: +(5411) 4759 0013



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