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SubjectRe: 2.4.21-pre3-ac4 oops in free_pages_ok
There are multiple other threads about this problem recently. One 
started by me, as well as a few others.
The consensus is that it's a problem in the ac tree, and is not present
in 2.4.21-pre3.
Some people seem to avoid the problem by disabling highmem, but this
doesn't work for me. Quota has been mentioned as a possible culprit, but
disabling that also doesn't help me. The ac changes to mm/shmem.c are
still a possibility, though one reporter seems to have tried that
without any success. The remaining candidate that has been mentioned to
me is the buffer cache changes in the ac tree, this seems moderately
likely. I don't see any obvious way to break out those changes from
Alan's large ac4 patch, so I emailed him hoping to get a patch free of
those changes, but I haven't heard back yet(it's been 9 hours dare he ignore me ;-).


Phil Oester wrote:

>Had a qmail server crash this morning with the below oops. Also had 2 other squid servers running same kernel die with no indication of why in syslog (couldn't see console). Think I'll stick with 2.4.20 for now...
>Phil Oester
>Jan 16 08:34:34 mail34 kernel: Unable to handle kernel NULL pointer dereference at virtual address 00000004
>Jan 16 08:34:34 mail34 kernel: c0131566
>Jan 16 08:34:34 mail34 kernel: *pde = 00000000
>Jan 16 08:34:34 mail34 kernel: Oops: 0002
>Jan 16 08:34:34 mail34 kernel: CPU: 0
>Jan 16 08:34:34 mail34 kernel: EIP: 0010:[<c0131566>] Not tainted
>Using defaults from ksymoops -t elf32-i386 -a i386
>Jan 16 08:34:34 mail34 kernel: EFLAGS: 00010246
>Jan 16 08:34:34 mail34 kernel: eax: 00000000 ebx: c16eaf50 ecx: c9a00000 edx: c9a0005c
>Jan 16 08:34:34 mail34 kernel: esi: 00000000 edi: 00000000 ebp: 00000000 esp: c9a01d84
>Jan 16 08:34:34 mail34 kernel: ds: 0018 es: 0018 ss: 0018
>Jan 16 08:34:34 mail34 kernel: Process smtp_message (pid: 12110, stackpage=c9a01000)
>Jan 16 08:34:34 mail34 kernel: Stack: d63b3840 40014000 00000001 d56f2b00 c0126a82 d63b3840 d56f2b00 c1c0fdb8
>Jan 16 08:34:34 mail34 kernel: e4e51000 c1000020 cd552cc0 c012e78a c1c0fdb8 00000025 00000000 c1c22660
>Jan 16 08:34:34 mail34 kernel: c012fb39 c1c0fdb8 cd552cc0 00000000 c1c0fdc0 c1c0fdc8 c5523b50 c9a00000
>Jan 16 08:34:34 mail34 kernel: Call Trace: [<c0126a82>] [<c012e78a>] [<c012fb39>] [<c0130cc9>] [<c0130d6c>]
>Warning (Oops_read): Code line not seen, dumping what data is available
>>>EIP; c0131566 <__free_pages_ok+286/2a0> <=====
>Trace; c0126a82 <handle_mm_fault+62/d0>
>Trace; c012e78a <kmem_slab_destroy+aa/d0>
>Trace; c012fb39 <kmem_cache_reap+2b9/330>
>Trace; c0130cc9 <shrink_caches+19/80>
>Trace; c0130d6c <try_to_free_pages_zone+3c/60>
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