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Date: Fri, 18 Nov 2011 13:10:47 +0200
From: Nikos Vassiliadis <nvass@gmx.com>
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Subject: arprequest triggered panic
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Hello,

I was playing with lagg and found out a kernel panic. Here is
the backtrace:
> #5  0xc0a65613 in kdb_trap (type=12, code=0, tf=0xc3f1bb1c) at /usr/src/sys/kern/subr_kdb.c:625
> #6  0xc0dbbc1f in trap_fatal (frame=0xc3f1bb1c, eva=24) at /usr/src/sys/i386/i386/trap.c:966
> #7  0xc0dbbd1c in trap_pfault (frame=0xc3f1bb1c, usermode=0, eva=24) at /usr/src/sys/i386/i386/trap.c:839
> #8  0xc0dbc9b5 in trap (frame=0xc3f1bb1c) at /usr/src/sys/i386/i386/trap.c:558
> #9  0xc0da54fc in calltrap () at /usr/src/sys/i386/i386/exception.s:168
> #10 0xc0b496eb in arprequest (ifp=0xc42c5400, sip=0xc46625ac, tip=0xc46625ac, enaddr=0xc41d3d9b "\b") at /usr/src/sys/netinet/if_ether.c:264
> #11 0xc0b4acef in arp_ifinit (ifp=0xc42c5400, ifa=0xc4662500) at /usr/src/sys/netinet/if_ether.c:880
> #12 0xc0aea7ae in if_setlladdr (ifp=0xc42c5400, lladdr=0xc49ac204 "\b", len=6) at /usr/src/sys/net/if.c:3317
> #13 0xc4bb7bd3 in lagg_port_setlladdr (arg=0xc4a47b00, pending=1) at /usr/src/sys/modules/if_lagg/../../net/if_lagg.c:476
> #14 0xc0a730fb in taskqueue_run_locked (queue=0xc42f3400) at /usr/src/sys/kern/subr_taskqueue.c:308
> #15 0xc0a7321f in taskqueue_run (queue=0xc42f3400) at /usr/src/sys/kern/subr_taskqueue.c:322
> #16 0xc0a732d3 in taskqueue_swi_run (dummy=0x0) at /usr/src/sys/kern/subr_taskqueue.c:418

It's triggered with these commands:
ifconfig em2 10.0.156.1/24
ifconfig em3 10.0.156.2/24
i=`ifconfig lagg create`
ifconfig $i laggport em2 laggport em3
ifconfig $i 10.0.156.3/24

Just reporting, should I fill a PR?

Nikos