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Date: Mon, 18 Jun 2012 12:52:19 +0200
From: David ROFFIAEN <dr@roffiaen.com>
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Subject: vlan+iwn panic
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Hi list,

I encoutered a panic with FreeBSD 9 Stable creating vlan with wlan0 
(iwn0) parent. Panic occur when upping the vlan :

Unread portion of the kernel message buffer:


Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x0
fault code              = supervisor read data, page not present
instruction pointer     = 0x20:0x0
stack pointer           = 0x28:0xffffff800024b3f0
frame pointer           = 0x28:0xffffff800024b4b0
code segment            = base 0x0, limit 0xfffff, type 0x1b
                         = DPL 0, pres 1, long 1, def32 0, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 12 (swi4: clock)
trap number             = 12
panic: page fault
cpuid = 0
KDB: stack backtrace:
#0 0xffffffff80625896 at kdb_backtrace+0x66
#1 0xffffffff805ed71e at panic+0x1ce
#2 0xffffffff80887690 at trap_fatal+0x290
#3 0xffffffff808879fc at trap_pfault+0x21c
#4 0xffffffff80887ff5 at trap+0x365
#5 0xffffffff80872713 at calltrap+0x8
#6 0xffffffff807b9968 at nd6_output+0x18
#7 0xffffffff807b41ed at ip6_output+0x11dd
#8 0xffffffff807b4c8c at mld_dispatch_packet+0xdc
#9 0xffffffff807b5121 at mld_dispatch_queue+0x21
#10 0xffffffff807b7ac0 at mld_fasttimo+0x640
#11 0xffffffff8064fdbb at pffasttimo+0x2b
#12 0xffffffff80603540 at softclock+0x3c0
#13 0xffffffff805bf3e4 at intr_event_execute_handlers+0x104
#14 0xffffffff805c0b64 at ithread_loop+0xa4
#15 0xffffffff805bc04f at fork_exit+0x11f
#16 0xffffffff80872c3e at fork_trampoline+0xe

This problem doesn't occur with atheros card on SOEKRIS (i386)

Regards

David