On Thu, 15 Nov 2012, James Cloos wrote:

The kernel does not log anything relevant to this.

Can you do the following as root:

	dmesg -c > /dev/null
	echo m > /proc/sysrq-trigger
	dmesg > foo

and send foo inline in your reply?

Slabinfo gives some odd output.  It seems to think there are negative
quantities of some slabs:

Name                   Objects Objsize    Space Slabs/Part/Cpu  O/S O %Fr %Ef Flg
:at-0000016               5632      16    90.1K 18446744073709551363/0/275  256 0   0 100 *a
:t-0000048                3386      48   249.8K 18446744073709551558/22/119   85 0  36  65 *
:t-0000120                1022     120   167.9K 18446744073709551604/14/53   34 0  34  73 *
blkdev_requests            182     376   122.8K 18446744073709551604/7/27   21 1  46  55 
ext4_io_end                348    1128   393.2K 18446744073709551588/0/40   29 3   0  99 a

Can you send the output of

	zgrep CONFIG_SL[AU]B /proc/config.gz
	cat /proc/slabinfo