kern/49410: -current: panic: "KERNEL_LOCKED_P()" failed: file ".../if_loop.c", line 221

[kardel%netbsd.org@localhost]

>Number:         49410
>Category:       kern
>Synopsis:       -current MROUTING enabled kernel panics in if_loop.c:221 with KERNEL_LOCKED_P assertion
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Nov 22 15:35:00 +0000 2014
>Originator:     Charlie Root
>Release:        NetBSD 7.99.1
>Organization:
>Environment:
System: NetBSD gateway.kardel.name 7.99.1 NetBSD 7.99.1 (GATEWAY) #21: Sat Nov 22 13:49:32 CET 2014 kardel%pip.kardel.name@localhost:/fs/raid1a/src/NetBSD/cur/src/obj.amd64/sys/arch/amd64/compile/GATEWAY amd64
Architecture: x86_64
Machine: amd64
>Description:
	A -current kernel with multicast support panics due to locking error.

panic: kernel diagnostic assertion "KERNEL_LOCKED_P()" failed: file "/fs/raid1a/src/NetBSD/cur/src/sys/net/if_loop.c", line 221
cpu1: Begin traceback...
vpanic() at netbsd:vpanic+0x13c
kern_assert() at netbsd:kern_assert+0x4f
looutput() at netbsd:looutput+0x39e
ip_output() at netbsd:ip_output+0x8b0
igmp_sendpkt.isra.1() at netbsd:igmp_sendpkt.isra.1+0x117
igmp_fasttimo() at netbsd:igmp_fasttimo+0xb3
pffasttimo() at netbsd:pffasttimo+0x31
callout_softclock() at netbsd:callout_softclock+0x1d0
softint_dispatch() at netbsd:softint_dispatch+0xd3
>How-To-Repeat:
	pick -current kernel with MROUTING enabled and run with
	multicast services like mrouted and multiple interfaces
	and watch it panic while trying to reach multi user.
>Fix:
	With MROUTING disabled the kernel will survive the startup
	but that is not the solution.

>Unformatted:
 	-current of 20141122