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Date: Wed, 23 Apr 2008 13:06:32 GMT
From: Martin Sugioarto <nakal@web.de>
To: freebsd-gnats-submit@FreeBSD.org
Subject: panic "Bad tailq NEXT(%p->tqh_last) != NULL"
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>Number:         123013
>Category:       kern
>Synopsis:       [vm] panic "Bad tailq NEXT(%p->tqh_last) != NULL"
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-bugs
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Apr 23 13:10:01 UTC 2008
>Closed-Date:    Sun Jun 12 06:02:56 UTC 2011
>Last-Modified:  Sun Jun 12 06:02:56 UTC 2011
>Originator:     Martin Sugioarto
>Release:        FreeBSD 7.0-STABLE
>Organization:
>Environment:
FreeBSD link.local 7.0-STABLE FreeBSD 7.0-STABLE #0: Thu Apr 17 11:26:28 CEST 2008 
root@link.local:/usr/obj/usr/src/sys/LINK  i386
>Description:

A spontaneous panic occured on my laptop. I have no further information, because there was nothing special going on.

Here the trace output:
#0  doadump () at pcpu.h:195
#1  0xc04ae5fb in db_fncall (dummy1=-1068406707, dummy2=0,
    dummy3=-1061752640, dummy4=0xe6880950 "")
    at /usr/src/sys/ddb/db_command.c:514
#2  0xc04aeb5c in db_command (last_cmdp=0xc0ada694, cmd_table=0x0, dopager=1)
        at /usr/src/sys/ddb/db_command.c:411
#3  0xc04aec5d in db_command_loop () at /usr/src/sys/ddb/db_command.c:464
#4  0xc04b031f in db_trap (type=3, code=0) at /usr/src/sys/ddb/db_main.c:228
#5  0xc06f3c5e in kdb_trap (type=3, code=0, tf=0xe6880af4)
	    at /usr/src/sys/kern/subr_kdb.c:524
#6  0xc097822b in trap (frame=0xe6880af4) at /usr/src/sys/i386/i386/trap.c:648
#7  0xc095f51b in calltrap () at /usr/src/sys/i386/i386/exception.s:139
#8  0xc06f3dbf in kdb_enter_why (why=0xc09f89f6 "panic",
	        msg=0xc09f89f6 "panic") at cpufunc.h:60
#9  0xc06ca1fb in panic (
		    fmt=0xc09c4571 "Bad tailq NEXT(%p->tqh_last) != NULL")
    at /usr/src/sys/kern/kern_shutdown.c:556
#10 0xc0974237 in pmap_try_insert_pv_entry (pmap=0xc4ff0f0c, va=134512640,
        m=0xc15fedf8) at /usr/src/sys/i386/i386/pmap.c:1969
#11 0xc0974abc in pmap_copy (dst_pmap=0xc4ff0f0c, src_pmap=0xc3f418b4,
	    dst_addr=134512640, len=32768, src_addr=134512640)
    at /usr/src/sys/i386/i386/pmap.c:2873
#12 0xc0905a22 in vmspace_fork (vm1=0xc3f41828)
        at /usr/src/sys/vm/vm_map.c:2530
#13 0xc06aa033 in fork1 (td=0xc40e4cc0, flags=Variable "flags" is not available.

	)
    at /usr/src/sys/kern/kern_fork.c:275
#14 0xc06ab4a0 in fork (td=0xc40e4cc0, uap=0xe6880cfc)
        at /usr/src/sys/kern/kern_fork.c:94
#15 0xc09779f0 in syscall (frame=0xe6880d38)
	    at /usr/src/sys/i386/i386/trap.c:1035
#16 0xc095f580 in Xint0x80_syscall ()
	        at /usr/src/sys/i386/i386/exception.s:196
#17 0x00000033 in ?? ()
		Previous frame inner to this frame (corrupt stack?)


I hope it helps.
>How-To-Repeat:
Probably impossible, because spontaneous. 
>Fix:


>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: freebsd-i386->freebsd-bugs 
Responsible-Changed-By: linimon 
Responsible-Changed-When: Mon Apr 28 08:10:21 UTC 2008 
Responsible-Changed-Why:  
reclassify. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=123013 
State-Changed-From-To: open->feedback 
State-Changed-By: jh 
State-Changed-When: Sat Jun 11 16:07:03 UTC 2011 
State-Changed-Why:  
Can you still reproduce this on a supported release? 

http://www.freebsd.org/cgi/query-pr.cgi?pr=123013 
State-Changed-From-To: feedback->closed 
State-Changed-By: jh 
State-Changed-When: Sun Jun 12 06:02:55 UTC 2011 
State-Changed-Why:  
Submitter can't reproduce anymore. 

http://www.freebsd.org/cgi/query-pr.cgi?pr=123013 
>Unformatted:
