kern/124464: Panic after showing login

[Martin]

>Number:         124464
>Category:       kern
>Synopsis:       Panic after showing login
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Jun 10 22:00:08 UTC 2008
>Closed-Date:
>Last-Modified:
>Originator:     Martin
>Release:        7.0-STABLE
>Organization:
>Environment:
FreeBSD zelda.local 7.0-STABLE FreeBSD 7.0-STABLE #0: Fri Jun  6 20:32:30 CEST 2008     root at zelda.local:/usr/obj/usr/src/sys/ZELDA  amd64
>Description:
I got this panic right after boot finished and login showed up:

(I had to write this on a piece of paper, because doadump failed, so the formatting is broken)

Fatal trap 12: page fault while in kernel mode
cpuid = 0; apic id = 00
fault virtual address = 0x0
fault code = supervisor read instruction, page not present
instruction pointer = 0x8:0x0
stack pointer = 0x10:0xffffffffaf424780
frame pointer = 0x10:0xffffffffaf4247c0
code segment = base 0x0, limit 0xfffff, type 0x1b
             = DPL 0, pres 1, long 1, def32 0, gran 1
current process = 1058 (hald)
[thread pid 1058 tid 100094]
Stopped at 0: *** error readin from address 0 ***
db> bt
Tracing pid 1058 tid 100094 td 0xffffff00080eb350
uart_z8530_class() at 0
vfs_kqfilter() at vfs_kqfilter+0x6d
vn_kqfilter() at vn_kqfilter+0x50
kqueue_register() at kqueue_register+0x812
kern_kevent() at kern_kevent+0xfc
kevent() at kevent+0x85
syscall() at syscall+0x254
Xfast_syscall() at Xfast_syscall+0xab
--- syscall(363,FreeBSD ELF64,kevent), rip=0x8010da2f2c, rsp=7fffffffea78, rbp=0x5

>How-To-Repeat:
Spontaneous. Probably you cannot.
>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted: