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SubjectRe: 2.4.25 SMP - BUG at page_alloc.c:105
Marcelo Tosatti <marcelo.tosatti@cyclades.com> wrote:
>
>
> The backtrace is odd to me.
>
> set_page_dirty() does not call __free_pages_ok() directly or indirectly.
>

I'd suspect that's just gunk on the stack and that zap_pte_range() freed an
anonymous page which had a non-null ->mapping. It could be a hardware bug.
Without seeing the actual value of page->mapping it's hard to know.

It would be good to backport the bad_page() debug code so we get a bit more
info when this sort of thing happens.



> ---
>
> Hi,
>
> I found this in the logs of a Dual Athlon MP machine (Tyan board)
> running 2.4.25-SMP:
>
> kernel BUG at page_alloc.c:105!
> invalid operand: 0000
> CPU: 0
> EIP: 0010:[__free_pages_ok+80/704] Not tainted
> EFLAGS: 00010286
> eax: c0333674 ebx: c1b2d720 ecx: 00000000 edx: f22f7a84
> esi: 00000001 edi: 00000000 ebp: 00000001 esp: f6901e3c
> ds: 0018 es: 0018 ss: 0018
> Process svscan (pid: 1348, stackpage=f6901000)
> Stack: c033364c f741cbc0 f22f7a84 00000001 0804c000 c0133ea6 f22f79c0 00000004
> 00000001 00000001 0804c000 00000001 c01308fa c1b2d720 f68e3080 0804b000
> 00001000 0844b000 c03ac4e0 00000001 0804c000 f68e3084 f42baa40 f7212440
> Call Trace: [set_page_dirty+166/176] [zap_page_range+330/400] [exit_mmap+221/352] \
> [mmput+88/176] [do_exit+259/800] [sig_exit+195/208] [dequeue_signal+95/192] \
> [do_signal+448/694] [schedule_timeout+94/176] [process_timeout+0/96] \
> [sys_nanosleep+232/448] [do_page_fault+0/1347] [signal_return+20/24]
>
> Other than this BUG (that took down the machine hard, I was lucky to log
> across the network), there appear to be no relevant logs shortly before
> this crash.
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