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From: Jonathan <j.e.drews@worldnet.att.net>
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Date: Sun, 09 May 2004 02:44:28 -0500
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Subject: Re: vinvalbuf panic while shutting down
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FreeBSD 5.2-CURRENT #0: Sat May 8 17:45:59 CDT 2004

Hi:

 I gte a kernel panic when I deliberately remove a umass storage device
that is still mounted. The machine panics after the halt command. I
recopied these messages.


umass0: at uhb1 port 2 (addr 2) disconnected
(pass0:umass-sim0:0:0:0): lost device
(pass0:umass-sim0:0:0:0): removing device entry
(pass0:umass-sim0:0:0:0): lost device
umass0: detached

Fatal trap 12: page fault while in kernel mode
fault virtual address   =0xb9a558c0
fault code     = supervisor write, page not present
instruction pointer   = 0x8:0xc04437cb
stack pointer  =  0x10:0xd6bebaa8
frame pointer  =  0x10:0xd6bebaac
code segement = base 0x0, limit 0xfffff, type 0x1b
              = DPL 0, pres 1, def32 1, gran 1
processor eflags = interrupt enabled, resume, IOPL = 0
current process = 1 (init)
trap number = 12
panic: page fault 
at line 815 in file /usr/src/sys/i386/i386/trap.c



On Wed, 2004-04-28 at 00:14, Jonathan wrote:
> uname: 5.2-CURRENT #0: Sun Apr 25 22:37 CDT
> i386
> compiled using std make.conf ( only -O for optimization)
> 
> 
> While shutting down my FreeBSD laptop, I got this panic:
> 
> panic: vinvalbuf: dirty bufs  
> at line 921 in file /usr/src/sys/kern/vfs_subr.c
> 
> I had just detached a USB mass storage device (umass) and then given the
> command "halt", when the panic happened. I may have forgotten to do
> umount /mnt, which may have caused the panic ? FreeBSD CURRENT has
> worked fine beside this first panic.