>Number:         10228
>Category:       kern
>Synopsis:       trying to clear a ktrace on a running process panics and freezes the system
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Mon May 29 13:21:00 PDT 2000
>Closed-Date:
>Last-Modified:
>Originator:     Andreas Wrede
>Release:        <NetBSD-current source date> May 27, 00
>Organization:
Planix, Inc
>Environment:
	
System: NetBSD woffi.planix.com 1.4Z NetBSD 1.4Z (WOFFI-IPv6) #1: Mon May 29 13:56:28 EDT 2000 root@woffi.planix.com:/usr/src/sys/arch/i386/compile/WOFFI i386


>Description:
	
Trying to clear a ktrace on a running process will create a number of 
panic: traps and then lock up the system.

>How-To-Repeat:
	
# ps -axc|grep lpd
  271 ??  Is     0:00.01 lpd
# ktrace -p 271
# ktrace -c -p 271
[....]
uvm_fault(....) -> 1
fatal page fault in supervisor mode
trape 6 code 2 eip .....
oanix: trap
Begin traceback...
trap() at tarp+0x22d
--- trap (number 0) ---
uvm_fault(....) -> 1
fatal page fault in supervisor mode
trape 6 code 2 eip .....
oanix: trap
Begin traceback...
trap() at tarp+0x22d
--- trap (number 0) ---
uvm_fault(....) -> 1
fatal page fault in supervisor mode
trape 6 code 2 eip .....
oanix: trap
Begin traceback...
trap() at tarp+0x22d
--- trap (number 0) ---
uvm_fault(....) -> 1
fatal page fault in supervisor mode
trape 6 code 2 eip .....
oanix: trap
Begin traceback...
trap() at tarp+0x22d
--- trap (number 0) ---
[System frozen]

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