smbfs panic when lost connection or unmount --force

[Robert Watson]

On Fri, 10 Jul 2009, Oliver Pinter wrote:

> It is a kernel panic, when force unmount the smbfs volume or lost the 
> connection with the samba server.

This is a NULL pointer dereference in the kernel.  Per Attilio's e-mail, a 
stack trace should help us track it down.  Thanks!

Robert N M Watson
Computer Laboratory
University of Cambridge

>
> --
> Thes OS is:
>
>
> kern.ostype: FreeBSD
> kern.osrelease: 7.2-STABLE
> kern.osrevision: 199506
> kern.version: FreeBSD 7.2-STABLE #4: Sat Jun 27 21:44:32 CEST 2009
>    root at oliverp:/usr/obj/usr/src/sys/stable
> kern.osreldate: 702103
>
> --
> make.conf:
>
>
> CPUTYPE?=core2
> CFLAGS= -O2 -fno-strict-aliasing -pipe
> MODULES_OVERRIDE=smbfs libiconv libmchain zfs opensolaris drm cd9660
> cd9660_iconv
>
> --
> panic message:
>
> Jul 10 01:58:39 oliverp syslogd: kernel boot file is /boot/kernel/kernel
> Jul 10 01:58:39 oliverp kernel: kernel trap 12 with interrupts disabled
> Jul 10 01:58:39 oliverp kernel:
> Jul 10 01:58:39 oliverp kernel:
> Jul 10 01:58:39 oliverp kernel: Fatal trap 12: page fault while in kernel mode
> Jul 10 01:58:39 oliverp kernel: cpuid = 2; apic id = 02
> Jul 10 01:58:39 oliverp kernel: fault virtual address	= 0x30
> Jul 10 01:58:39 oliverp kernel: fault code		= supervisor read data,
> page not present
> Jul 10 01:58:39 oliverp kernel: instruction pointer	= 0x8:0xffffffff80327fd0
> Jul 10 01:58:39 oliverp kernel: stack pointer	        = 0x10:0xffffff8078360940
> Jul 10 01:58:39 oliverp kernel: frame pointer	        = 0x10:0xffffff0004c31390
> Jul 10 01:58:39 oliverp kernel: code segment		= base 0x0, limit
> 0xfffff, type 0x1b
> Jul 10 01:58:39 oliverp kernel: = DPL 0, pres 1, long 1, def32 0, gran 1
> Jul 10 01:58:39 oliverp kernel: processor eflags	= resume, IOPL = 0
> Jul 10 01:58:39 oliverp kernel: current process		= 60406 (smbiod0)
> Jul 10 01:58:39 oliverp kernel: trap number		= 12
> Jul 10 01:58:39 oliverp kernel: panic: page fault
> Jul 10 01:58:39 oliverp kernel: cpuid = 2
> Jul 10 01:58:39 oliverp kernel: Uptime: 6h51m16s
> Jul 10 01:58:39 oliverp kernel: Physical memory: 4087 MB
> Jul 10 01:58:39 oliverp kernel: Dumping 2448 MB:Copyright (c)
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