i386/123013: panic "Bad tailq NEXT(%p->tqh_last) != NULL"

[Martin Sugioarto]

>Number:         123013
>Category:       i386
>Synopsis:       panic "Bad tailq NEXT(%p->tqh_last) != NULL"
>Confidential:   no
>Severity:       serious
>Priority:       low
>Responsible:    freebsd-i386
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Wed Apr 23 13:10:01 UTC 2008
>Closed-Date:
>Last-Modified:
>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 at 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:
>Unformatted: