Date: Sun, 7 Apr 2002 09:00:39 -0700 (PDT) From: Joe Ondrechen <ondrechenj@whiteice.com> To: freebsd-gnats-submit@FreeBSD.org Subject: i386/36850: Page Fault using ppp with USB Modem Message-ID: <200204071600.g37G0d819894@freefall.freebsd.org>
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>Number: 36850
>Category: i386
>Synopsis: Page Fault using ppp with USB Modem
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-bugs
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Sun Apr 07 09:10:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator: Joe Ondrechen
>Release: 4.5R
>Organization:
N/A
>Environment:
FreeBSD 4.5-RELEASE #22: /usr/src/sys/compile/KAYAKXW i386
>Description:
Kernel panic page fault occurs when using ppp with USB modem:
Fatal trap 12: page fault while in kernel mode
fault virtual address = 0x0
fault code = supervisor read, page not present
instruction pointer = 0x8:0xc030de4f
stack pointer = 0x10:0xcde34bd4
frame pointer = 0x10:0xcde34c04
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 = 131 (ppp)
interrupt mask = tty
trap number = 12
panic: page fault
---
(kgdb) backtrace
#0 0xc01bc4f2 in dumpsys ()
#1 0xc01bc307 in boot ()
#2 0xc01bc6e8 in poweroff_wait ()
#3 0xc030f1fa in trap_fatal ()
#4 0xc030eecd in trap_pfault ()
#5 0xc030eab7 in trap ()
#6 0xc030de4f in generic_bcopy ()
#7 0xc01d2f03 in ttread ()
#8 0xc047deb6 in ?? ()
#9 0xc01f4743 in spec_read ()
#10 0xc028dfec in ufsspec_read ()
#11 0xc028e651 in ufs_vnoperatespec ()
#12 0xc01f0898 in vn_read ()
#13 0xc01cab6c in dofileread ()
#14 0xc01caa32 in read ()
#15 0xc030f4a9 in syscall2 ()
#16 0xc0303b15 in Xint0x80_syscall ()
>How-To-Repeat:
Surf web using USB modem, ppp user mode.
>Fix:
>Release-Note:
>Audit-Trail:
>Unformatted:
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