Re: PROBLEM: kernel BUG at mm/slab.c:3002!

[Matt Mackall <mpm@selenic.com>]

On Tue, 2009-03-10 at 13:29 -0400, Alan D. Brunelle wrote:
> Matt Mackall wrote:
> > On Tue, 2009-03-10 at 11:16 -0400, Alan D. Brunelle wrote:
> >> Running blktrace & I/O loads cause a kernel BUG at mm/slab.c:3002!.
> > 
> > Pid: 11346, comm: blktrace Tainted: G    B      2.6.29-rc7 #3 ProLiant
> > DL585 G5   
> > 
> > That 'B' there indicates you've hit 'bad page' before this. That bug
> > seems to be strongly correlated with some form of hardware trouble.
> > Unfortunately, that makes everything after that point a little suspect.
> 
> 
> /If/ it were a hardware issue, that might explain the subsequent issue
> when I switched to SLUB instead...

Well it was almost certainly not a bug in SLAB itself (and your SLUB
test is obviously quite conclusive there). We'd have lots of reports.
It's probably too early to conclude it's hardware though.

> How does one look for "bad page reports"?

It'll look something like this (pasted from Google):

>>     kernel: Bad page state at free_hot_cold_page (in process 'beam',
>> page c1a95320)
>>     kernel: flags:0x40020118 mapping:f401adc0 mapped:0 count:0
>> private:0x00000000

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