> further comments #2:
>
> when rebooting, there was some disk corruption in the ext2 filesystem.
>
> It is my guess that this is to the large number of buffers in the vmstat
> output, which I believe are dirty buffers that never got written out
Judging by your log it's not an OOM - page table corruption got caught by
do_wp_page(), which means that handle_mm_fault() fails (surprise, surprise),
which kills the process.
Looks like a massive memory corruption - later it fscked you in pte_alloc()
and then it screwed buffer cache lists.
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