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kern/40055: efs does not handle specfs properly

>Number:         40055
>Category:       kern
>Synopsis:       efs does not handle specfs properly
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Nov 28 14:45:00 +0000 2008
>Originator:     Antti Kantee
Or maybe the kernel can't handle efs?  Anyway...

wapbl code assumes that for all vnodes of type VBLK v_specmountpoint is valid.  
efs does not do spec_node_init() or set the specops vector for VBLK vnodes.  As 
a result, you get a kernel panic in vn_lock() -> wapbl_vphaswapbl() -> 

Might not happen on a kernel without DIAGNOSTIC (didn't check).
Use efs with block device nodes on it.

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