On Thu, Dec 27, 2012 at 11:27:37PM -0500, Joshua Kinard wrote:
> Has anyone run into an unhandled kernel unaligned access under 3.7.1? I've
> triggered it twice w/ network I/O on an SGI IP32 machine, however, the stack
> trace does not appear to be specific to any of IP32's own drivers. 3.6.7
> was very stable, and the two oopses I've triggered so far both happened
> under 3.7.1.
>
> It looks like the culprit is in sk_stream_alloc_skb or tcp_sendmsg, however,
> I have little experience in the higher-level networking stack within Linux
> and wanted to see if anyone else has triggered this on other MIPS systems.
>
> Seems to happen when I am logged in via SSH (on IPv6) and generating a burst
> of console output.
>
> Unhandled kernel unaligned access[#3]:
> Cpu 0
> $ 0 : 0000000000000000 0000000000000010 0000000000000000 bfffff005671271c
> $ 4 : 0000000000000000 0000000000000000 0000000000000000 0000000000000000
> $ 8 : 980000005c24e000 0000000000000000 980000005c24e000 00000000000000cc
> $12 : ffffffff9001fce1 000000001000001e fffffffffffff000 000000000000001f
> $16 : 980000005c00fa40 ffffffffde0300b8 ffffff0000000000 0000000000000005
> $20 : 000000007f875700 00000000000005a8 0000000000000008 0000000000000005
> $24 : 0000000000000001 00000000000003f0
> $28 : 980000005c00c000 980000005c00fa10 0000000000000000 ffffffff800059a0
> Hi : 0000000007a11c93
> Lo : b645a1cac992645e
> epc : ffffffff8000b700 do_ade+0x1b0/0x480
> Tainted: G D
^^^
This kernel has already oopsed before. Which means this oops message is
pretty much worthless.
Ralf
