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Date: Sat, 15 Jun 2002 11:53:45 -0700 (PDT)
From: blaze <blaze@rootshell.be>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: misc/39341: ppp + USB modem problem
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>Number:         39341
>Category:       misc
>Synopsis:       ppp + USB modem problem
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Jun 15 12:00:07 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     blaze
>Release:        4.6-RC
>Organization:
...
>Environment:
FreeBSD kalieye 4.6-RC FreeBSD 4.6-RC #6: Thu Jun 13 14:26:15 CEST 2002     root@kalieye:/usr/src/sys/compile/KALIEYE  i386

>Description:
when i run ppp using my USB modem, (umodem as a module)
on great payload the modem shuts down and i receive the message:

usb0 host controller process error
usb0 host controller halted

and next the page fault:

Fatal trap 12: page fault while in kernel mode
fault virtual adress  = 0x14
fault code            = supervisor read, page not present
instruction pointer   = 0x8:0xc01fb1b3
stack pointer         = 0x10:0xcde12d3c
frame pointer         = 0x10:0xcde12d54
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       = 128(ppp)
interrupt mask        = none
kernel: type 12 trap, code = 0
Stopped at spec_poll+0x

the nm command says:

root@kalieye:~# nm -n /kernel | grep c01fb1b3
root@kalieye:~# nm -n /kernel | grep c01fb1b
root@kalieye:~# nm -n /kernel | grep c01fb1
c01fb168 t spec_ioctl
c01fb198 t spec_poll
c01fb1c0 t spec_kqfilter
c01fb1fc t spec_fsync



>How-To-Repeat:
use a usb modem with ppp and give a lot of payload
(for example i do it using cvsup)

>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted:

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