kern/71791: Fatal trap 12: page fault while in kernel mode

Claudio Destro o1b6 at
Thu Sep 16 04:40:26 PDT 2004

>Number:         71791
>Category:       kern
>Synopsis:       Fatal trap 12: page fault while in kernel mode
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Sep 16 11:40:25 GMT 2004
>Originator:     Claudio Destro
>Release:        FreeBSD 5.3-BETA4 i386
I receive a fatal trap 12 *every* time I disconnect my usb mass storage.

Inserting is ok:
uhub1: Sony USB Embedded Hub, class 9/0, rev. 2.00/0.01, addr3
uhub1: 1 port with 0 removable, self powered
umass0: Sony USB Mass Storage Denic, rev 2.00/0.01, addr 4
da1: at umass-sim0 bus 0 target 0 lun 0
da1: <Sony Storage Media 1.00> Removable Direct Access SCSI-0 device
da1: 1.000MB/s transfers
da1: 125MB (256000 512 bytes sectors; 64H 32/T 125LI)

Removing results in a kernel panic:

uhub1: at ubhub0 port 1 (addr 3) disconnected
(da:umass-sim0:0:0:0): lost device
(da:umass-sim0:0:0:0): removing device entry
umass0: detached
(null): at uhub1 port 1 (addr 4) disconnected

Fatal trap 12: page fault while in kernel mode
fault virtual address   = 0x400
fault code              = supervisor read, page not present
instruction pointer     = 0x84 0xc0690904
stack pointer           = 0x10 0xcc746bd4
frame pointer           = 0x10 0xcc746bf4
code segment            = base 0x0, limit 0xfffff, type 0x1b
                        = DPL 0, pres 1, def32 1, gran 1
processor eflags        = interrupt enabled, resume, IOPL = 0
current process         = 37 (usb0)
trap number             = 12

I dumped these info by hand this morning, but I think there are no errors...

hope this helps.


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