ifconfig carp1 destroy = kernel panic

Stefan Lambrev stefan.lambrev at sun-fish.com
Mon Feb 5 16:06:18 UTC 2007

Hi all,

This combination of commands lead my freebsd servers to kernel panic.

ifconfig bge0 netmask
ifconfig bge0 alias netmask
ifconfig carp create
ifconfig carp create
ifconfig carp0 vhid 1 advskew 0 pass somekey
ifconfig carp1 vhid 2 advskew 0 pass somekey
- to this point everything is ok -
ifconfig carp1 destroy - at this point this will cause kernel panic.
I tested with ifconfig carp1 delete before destroy but the result is the 

tested on freebsd 6.2 pre-release i386 SMP and freebsd 6.2 release amd64 
SMP - in both cases kernel panic.

This seems very similar to this PR - 

I'm going to test on 6.2 stable from today, but I'm not very optimistic.

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address   = 0x24
fault code              = supervisor read, page not present
instruction pointer     = 0x20:0xc0555bcd
stack pointer           = 0x28:0xe4b77bd4
frame pointer           = 0x28:0xe4b77be8
code segment            = base 0x0, limit 0xfffff, type 0x1b
                                 = DPL 0, pres 1, def32 1, gran 1
processor eflags        = resume, IOPL = 0
current process         = 14 (swi1: net)
trap number             = 12
panic: page fault
cpuid = 0
Uptime: 7m2s
Cannot dump. No dump device defined.
aac0: shutting down controller...done

P.S. should I open new PR or just follow up to pr #92776 ?

Best Wishes,
Stefan Lambrev
ICQ# 24134177

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