Is it really the case that the bug only turns up when you run tests like

	while echo; do cat /sys/kernel/kexec_crash_loaded; done
and
	while echo; do cat /sys/kernel/uevent_seqnum ; done;

or will any fork-intensive workload also do it?  Say,

	while echo ; do true ; done

This does not leak, but having a simple text file and reading it in a
loop causes it.

?

Another interesting factoid here is that after the oomkilling you slabinfo has

mm_struct             38     98    584    7    1 : tunables   32   16    8 : slabdata     14     14      0 : globalstat    2781    196    49   31 				   0    1    0    0    0 : cpustat 368800  11864 368920  11721

so we aren't leaking mm_structs.  In fact we aren't leaking anything from
slab.   But we are leaking pgds.

iirc the most recent change we've made in the pgd_t area is the quicklist
management which went into 2.6.22-rc1.  You say the bug was present in
2.6.22.  Can you test 2.6.21?  

Nope, leak is not present in 2.6.21.7

-- 
regards,
Dhaval

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