misc/74171: Fatal trap 12: page fault while in kernel mode

Normal User freebsd at falx.port5.com
Sat Nov 20 09:30:26 PST 2004

>Number:         74171
>Category:       misc
>Synopsis:       Fatal trap 12: page fault while in kernel mode
>Confidential:   no
>Severity:       critical
>Priority:       low
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Nov 20 17:30:25 GMT 2004
>Originator:     Normal User
>Release:        5.3-RELEASE
FreeBSD  5.3-RELEASE FreeBSD 5.3-RELEASE #0: Fri Nov  5 04:19:18 UTC 2004     root at harlow.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  i386

      My test machine has an internal modem which uses the comms/ltmdm driver (Lucent WinModem), whenever someone calls me the system inmediately crashes badly. I've been tracking 4-STABLE in this machine for years without any problem. I did a fresh install of 5.3-RELEASE last week.

The error I receive is:

Fatal trap 12: page fault while in kernel mode
fault virtual address  = 0x138
fault code             = supervisor read, page not present
instruction pointer    = 0x8:0xc183300d
stack pointer          = 0x10:0xcc721c80
frame pointer          = 0x10:0xcc721c90
code segment           = base 0x0, limit 0xfffff, type 0x1b
                       = DPL0, pres1, def32 1, gran 1
procesor eflags        = resume, IOPL = 0
current process        = 35 (swi5: tty:ltmdm++)
trap number            = 12
panic: page fault
Uptime: 3h9m23s

dmesg reports

ltmdm0: <Lucent Winmodem> port 0xe800-0xe8ff,0xec00-0xec07 mem 0xdfffff00-0xdfffffff irq 19 at device 8.0 on pci0
ltmdm0: [GIANT-LOCKED]
ltmdm0: type Virtual 16550A

      just dial my phone number...


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