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Date: Sun, 7 Apr 2002 09:00:39 -0700 (PDT)
From: Joe Ondrechen <ondrechenj@whiteice.com>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: i386/36850: Page Fault using ppp with USB Modem
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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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