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port-shark/49381: Shark 6.1 kernel hangs occasionally in vm_map

>Number:         49381
>Category:       port-shark
>Synopsis:       Shark 6.1 kernel hangs occasionally in vm_map
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-shark-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Nov 11 11:45:00 +0000 2014
>Originator:     Ignatios Souvatzis
>Release:        NetBSD 6.1.4_PATCH
System: NetBSD marie 6.1.4_PATCH NetBSD 6.1.4_PATCH (MARIE) #4: Sat Aug 23 20:25:06 CEST 2014 is@henrietta:/var/itch/sources/6.1/obj.shark/sys/arch/shark/compile/MARIE shark
(Userland still 5.1.3ish)
Architecture: arm
Machine: shark

	Every about one to three weeks since I booted a 6.1 series
	kernel for evaluating upgrade to -6, my Shark's  hangs in
	vm_map. By which I mean: fork doesn't work anymore, exec*()
	doesn't work anymore.  This can not be worked around by
	killing processes using screen's kill window, so it doesn't
	look like a simple resource starvation of some sort.

	The machine can only be recovered from this state by rebooting
	it through ddb from the console or hardware reset.

	Boot and wait, no specific trigger known.
	Downgrade to a 5.1.3 kernel.; the machine was rock stable 
	with the -5 kernel for several months at a time. 


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