vinvalbuf panic while shutting down

Jonathan j.e.drews at
Sun May 9 00:42:50 PDT 2004

FreeBSD 5.2-CURRENT #0: Sat May 8 17:45:59 CDT 2004


 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.

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