Re: a possible bug in netfilter

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On Friday 2012-04-06 06:12, Serge Leschinsky wrote:
>
> Hello,
>
> Sometimes my system panics and below you can find the information I was able to
> catch via netconsole.
>
> LFS-based system, kernel 3.3.1, xtables-addons 1.41
>
> If I can do something to help you with debug/troubleshooting please let me
> know.

Adding Florian to Cc who, I think, is with Astaro which created this
monstrous main function.

> BUG: unable to handle kernel paging request at 00003800 00000000
> IP: [<ffffffffa02001bd>] xt_psd_match+0x1bd/0x5f4 [xt_psd]
> 80 00 00 00 00 48 39 f8 0f 84 57 03 00 00 48 89 45 c8
><48>8b 00 48 85 c0 75 eb 48 8d 04 92 83 c1 01 89 0d 56 b7 00 00

Two asm candidates pop up here:

 168:   48 8b 3f                mov    rdi,QWORD PTR [rdi]

 372:   48 8b 00                mov    rax,QWORD PTR [rax]
 375:   48 85 c0                test   rax,rax

This maps to lines lines similar to  (curr = curr->next) != NULL.
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