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SubjectRe: Oops on 2.5.40, flush_tlb_mm
Zwane Mwaikambo wrote:
>
> Hi,
> Please keep my CC on any replies (i'm currently experiencing
> DNS problems and hence do not get lkml)
>
> Dorking around in mozilla did this, the machine had completely locked up
> so this was from the serial;
>
> Unable to handle kernel paging request at virtual address 5a5a5ad6
> printing eip:
> c0115f2f
> *pde = 00000000
> Oops: 0000
>
> CPU: 0
> EIP: 0060:[<c0115f2f>] Not tainted
> EFLAGS: 00010202
> EIP is at flush_tlb_mm+0x1f/0x90
> eax: c1ce01a0 ebx: 5a5a5a5a ecx: 00000000 edx: fffffffe
> esi: 00400000 edi: c759d418 ebp: 00100000 esp: c2749f04
> ds: 0068 es: 0068 ss: 0068
> Process mozilla-bin (pid: 1396, threadinfo=c2748000 task=c1ce01a0)
> Stack: c759d418 c01418ab 5a5a5a5a c759d418 c142d810 c0141a1a c142d810 c195263c
> c012c577 00000001 00000000 c1ce01a0 41500000 00100073 00000002 c195263c
> c0141c62 c195263c 41800000 41500000 00000025 00000025 c2fda834 00000073
> Call Trace:
> [<c01418ab>]change_protection+0x1bb/0x210
> [<c0141a1a>]mprotect_attempt_merge+0x11a/0x1d0
> [<c012c577>]update_process_times+0x27/0x30
> [<c0141c62>]mprotect_fixup+0x192/0x1b0
> [<c0141de7>]sys_mprotect+0x167/0x2f0
> [<c010bd67>]do_IRQ+0x1e7/0x200
> [<c0109477>]syscall_call+0x7/0xb

You need Hugh's patch. Was sent to Linus yesterday...



Patch from Hugh Dickins

Our earlier fix for mprotect_fixup was broken - passing an
already-freed VMA to change_protection().



mm/mprotect.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletion(-)
--- 2.5.40/mm/mprotect.c~hugh-mprotect-fix Tue Oct 1 23:43:14 2002
+++ 2.5.40-akpm/mm/mprotect.c Tue Oct 1 23:43:14 2002
@@ -186,8 +186,10 @@ mprotect_fixup(struct vm_area_struct *vm
/*
* Try to merge with the previous vma.
*/
- if (mprotect_attempt_merge(vma, *pprev, end, newflags))
+ if (mprotect_attempt_merge(vma, *pprev, end, newflags)) {
+ vma = *pprev;
goto success;
+ }
} else {
error = split_vma(mm, vma, start, 1);
if (error)
.
-
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