Panic in tcp_input
andre at freebsd.org
Wed Jun 19 12:20:28 UTC 2013
On 19.06.2013 11:34, Ian FREISLICH wrote:
> Andre Oppermann wrote:
>> On 19.06.2013 11:10, Ian FREISLICH wrote:
>>> I'm seeing this panic quite regularly now. Most recent sighting on r251858.
>> This panic message is not very informative and very hard to extract any
>> meaningful hints. Do you have a core dump and matching debug kernel?
> I do. If you can send me your public ssh key in private email, I
> can give you access to the server in question.
It bombs while accessing a per-cpu counter:
(kgdb) frame 11
#11 0xffffffff8054518e in tcp_input (m=<value optimized out>, off0=Cannot access
memory at address 0x14)
45 __asm __volatile("addq\t%1,%%gs:(%0)"
This seems to be a fallout of the recent UMA changes and its interaction
with the per-cpu counter(9) system.
Adding in and handing over to Gleb and Jeff as they touched this area last.
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