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Date: Fri, 12 Apr 2002 00:13:57 -0700 (PDT)
From: Joe Ondrechen <ondrechenj@whiteice.com>
To: freebsd-gnats-submit@FreeBSD.org
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Subject: kern/37015: Kernel panic in tty_subr.c while using ppp with USB modem
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>Number:         37015
>Category:       kern
>Synopsis:       Kernel panic in tty_subr.c while 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:   Fri Apr 12 00:20:01 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     Joe Ondrechen
>Release:        4.5R
>Organization:
N/A
>Environment:
FreeBSD kayakxw.sd.lan 4.5-RELEASE FreeBSD 4.5-RELEASE #22: Sat Apr  6 18:47:32
PST 2002     joekjr@kayakxw.sd.lan:/usr/src/sys/compile/KAYAKXW  i386  
>Description:
Frequent clist reservation botch panics occur using ppp with a USB modem.

A typical backtrace looks like:
panic: clist reservation botch
---
#0  0xc01bc4f2 in dumpsys ()
(kgdb) backtrace
#0  0xc01bc4f2 in dumpsys ()
#1  0xc01bc307 in boot ()
#2  0xc01bc6e8 in poweroff_wait ()
#3  0xc01d6438 in b_to_q (
    src=0xcde2ad84 ".com\r\nAccept: image/gif, image/x-xbitmap, image/jpeg, image/pjpeg, image/png, */*\r\nAì­âÍþÞGÀ", amount=84, clistp=0xc15b4f38)
    at ../../kern/tty_subr.c:103
#4  0xc01d33d4 in ttwrite ()
#5  0xc047defe in ?? ()
#6  0xc01f47c1 in spec_write ()
#7  0xc028e034 in ufsspec_write ()
#8  0xc028e651 in ufs_vnoperatespec ()
#9  0xc01f0a4a in vn_write ()
#10 0xc01caf95 in dofilewrite ()
#11 0xc01cae4e in write ()
#12 0xc030f4a9 in syscall2 ()
#13 0xc0303b15 in Xint0x80_syscall ()
#14 0x806fadd in ?? ()
#15 0x805ab59 in ?? ()
#16 0x804d21c in ?? ()
#17 0x806c41a in ?? ()
#18 0x806bfd3 in ?? ()
#19 0x804b305 in ?? ()
      
>How-To-Repeat:
Browse web using a USB modem, ppp user mode. Other processes seem to increase the probability of this panic, such as running KDE Patience or a shell terminal within KDE. I have never had this occur while using ftp or lynx from the console.
>Fix:
      
>Release-Note:
>Audit-Trail:
>Unformatted:

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