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kern/38241: boot -a ... kernel_lock spinout

>Number:         38241
>Category:       kern
>Synopsis:       boot -a ... kernel_lock spinout
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Mar 14 22:55:00 +0000 2008
>Originator:     Andrew Doran
>Release:        4.99.55
The NetBSD Project
I've heard that boot -a can cause a kernel_lock spinout, probably due
to the boot CPU looping in/over cngetc().

Unknown. boot -a? Maybe it only happens with !__HAVE_FAST_SOFTINTS.

Make kernel_lock unnecessary for system bootstrap.

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