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Date:      Sun, 18 Jan 2004 22:20:02 -0700
From:      Scott Long <scottl@freebsd.org>
To:        "Robin P. Blanchard" <robin.blanchard@gactr.uga.edu>
Cc:        current@freebsd.org
Subject:   Re: Panic with this morning's (~9am EDT, 15 jan 2004) sources.
Message-ID:  <400B6902.7040203@freebsd.org>
In-Reply-To: <EE3D3FBAFFCAED448C21C398FDAD91AC0108DB@EBE1.gc.nat>
References:  <EE3D3FBAFFCAED448C21C398FDAD91AC0108DB@EBE1.gc.nat>

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Do you have DIAGNOSTIC enabled?  It's generally safe to run without it;
this particular bug is well known and will hopefully be fixed.

Scott

Robin P. Blanchard wrote:
> still panicing at boot with this morning's (~10am EDT, 18 jan 04) sources;
> but have found that a "cont" within db allows the machine to succesfully
> recover and come up 'normally'.
>  
> Mounting root from ufs:/dev/twed0s1a
> start_init: trying /sbin/init
> lock order reversal
>  1st 0xc06c20a0 dont_sleep_in_callout (dont_sleep_in_callout) @
> /usr/src/sys/ker
> n/kern_timeout.c:224
>  2nd 0xc06c1480 allproc (allproc) @ /usr/src/sys/kern/kern_synch.c:588
> Stack backtrace:
> backtrace(c0673b76,c06c1480,c066fc3d,c066fc3d,c0670c87) at backtrace+0x17
> witness_lock(c06c1480,0,c0670c87,24c,c1560070) at witness_lock+0x672
> _sx_slock(c06c1480,c0670c87,24c,e0,0) at _sx_slock+0xae
> loadav(0,0,c06715a8,e0,c06737ca) at loadav+0x25
> softclock(0,0,c066e0c1,23e,c1568528) at softclock+0x1fb
> ithread_loop(c3fb6300,d7254d48,c066df27,315,0) at ithread_loop+0x192
> fork_exit(c04f9950,c3fb6300,d7254d48) at fork_exit+0xb5
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xd7254d7c, ebp = 0 ---
> Debugger("witness_lock")
> Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0
> db> show locks
> exclusive sleep mutex dont_sleep_in_callout r = 0 (0xc06c20a0) locked @
> /usr/src
> /sys/kern/kern_timeout.c:224
> exclusive sleep mutex Giant r = 0 (0xc06c01a0) locked @
> /usr/src/sys/kern/kern_t
> imeout.c:217
> db> tr
> Debugger(c064a64d,c06c1480,c066fc3d,c066fc3d,c0670c87) at Debugger+0x55
> witness_lock(c06c1480,0,c0670c87,24c,c1560070) at witness_lock+0x687
> _sx_slock(c06c1480,c0670c87,24c,e0,0) at _sx_slock+0xae
> loadav(0,0,c06715a8,e0,c06737ca) at loadav+0x25
> softclock(0,0,c066e0c1,23e,c1568528) at softclock+0x1fb
> ithread_loop(c3fb6300,d7254d48,c066df27,315,0) at ithread_loop+0x192
> fork_exit(c04f9950,c3fb6300,d7254d48) at fork_exit+0xb5
> fork_trampoline() at fork_trampoline+0x8
> --- trap 0x1, eip = 0, esp = 0xd7254d7c, ebp = 0 ---
> db>
> 
> 	-----Original Message----- 
> 	From: Robin P. Blanchard 
> 	Sent: Sat 1/17/2004 5:19 PM 
> 	To: Robin P. Blanchard; Dag-Erling Smørgrav; Scott Long 
> 	Cc: current@freebsd.org 
> 	Subject: RE: Panic with this morning's (~9am EDT, 15 jan 2004)
> sources.
> 	
> 	
> 	Still no luck....cvsup'ed earlier this morning...still fails to boot
> (box in question is dell poweredge 350 with add-on twe raid controller).
> 	 
> 	# ident /boot/kernel/kernel |fgrep des
> 	     $FreeBSD: src/sys/kern/kern_descrip.c,v 1.223 2004/01/17
> 00:58:36 des Exp $
> 	     $FreeBSD: src/sys/kern/sys_pipe.c,v 1.163 2004/01/15 10:15:03
> des Exp $
> 	     $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.169 2004/01/15
> 10:15:03 des Exp $
> 	     $FreeBSD: src/sys/kern/uipc_usrreq.c,v 1.115 2004/01/17 00:59:04
> des Exp $
> 	     $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.336 2004/01/15
> 10:15:04 des Exp $
> 	     $FreeBSD: src/sys/libkern/ffsl.c,v 1.3 2004/01/14 07:47:10 des
> Exp $
> 	     $FreeBSD: src/sys/libkern/flsl.c,v 1.3 2004/01/14 07:47:10 des
> Exp $
> 	
> 	...
> 	Mounting root from ufs:/dev/twed0s1a
> 	start_init: trying /sbin/init
> 	lock order reversal
> 	 1st 0xc06c22e0 dont_sleep_in_callout (dont_sleep_in_callout) @
> /usr/src/sys/ker
> 	n/kern_timeout.c:224
> 	 2nd 0xc06c16c0 allproc (allproc) @
> /usr/src/sys/kern/kern_synch.c:588
> 	Stack backtrace:
> 	backtrace(c0673ded,c06c16c0,c066feb4,c066feb4,c0670efe) at
> backtrace+0x17
> 	witness_lock(c06c16c0,0,c0670efe,24c,c155e070) at witness_lock+0x672
> 	_sx_slock(c06c16c0,c0670efe,24c,e0,0) at _sx_slock+0xae
> 	loadav(0,0,c067181f,e0,c0673a41) at loadav+0x25
> 	softclock(0,0,c066e338,23e,c1566528) at softclock+0x1fb
> 	ithread_loop(c3fb5300,d7250d48,c066e19e,315,0) at ithread_loop+0x192
> 	fork_exit(c04f9c90,c3fb5300,d7250d48) at fork_exit+0xb5
> 	fork_trampoline() at fork_trampoline+0x8
> 	--- trap 0x1, eip = 0, esp = 0xd7250d7c, ebp = 0 ---
> 	Debugger("witness_lock")
> 	Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0
> 	db> show locks
> 	exclusive sleep mutex dont_sleep_in_callout r = 0 (0xc06c22e0) locked
> @ /usr/src
> 	/sys/kern/kern_timeout.c:224
> 	exclusive sleep mutex Giant r = 0 (0xc06c03e0) locked @
> /usr/src/sys/kern/kern_t
> 	imeout.c:217
> 	db> tr
> 	Debugger(c064a8cd,c06c16c0,c066feb4,c066feb4,c0670efe) at
> Debugger+0x55
> 	witness_lock(c06c16c0,0,c0670efe,24c,c155e070) at witness_lock+0x687
> 	_sx_slock(c06c16c0,c0670efe,24c,e0,0) at _sx_slock+0xae
> 	loadav(0,0,c067181f,e0,c0673a41) at loadav+0x25
> 	softclock(0,0,c066e338,23e,c1566528) at softclock+0x1fb
> 	ithread_loop(c3fb5300,d7250d48,c066e19e,315,0) at ithread_loop+0x192
> 	fork_exit(c04f9c90,c3fb5300,d7250d48) at fork_exit+0xb5
> 	fork_trampoline() at fork_trampoline+0x8
> 	--- trap 0x1, eip = 0, esp = 0xd7250d7c, ebp = 0 ---
> 	db> panic
> 	panic: from debugger
> 	cpuid = 0;
> 	Stack backtrace:
> 	backtrace(c065164d,0,c0664256,d7250a14,100) at backtrace+0x17
> 	panic(c0664256,d7250acc,c048ab32,c0614be5,0) at panic+0x141
> 	db_panic(c0614be5,0,ffffffff,d7250a40,d7250a3c) at db_panic+0x12
> 	db_command(c06b8220,c0691a00,c068b59c,c068b5a0,3) at db_command+0x272
> 	db_command_loop(c0614be5,d7250d7c,c078798e,8,0) at
> db_command_loop+0x95
> 	db_trap(3,0,0,46,0) at db_trap+0xc5
> 	kdb_trap(3,0,d7250b98,4,0) at kdb_trap+0x14c
> 	trap(d7250018,c0610010,10,c06efe58,c06c16c0) at trap+0x4ca
> 	calltrap() at calltrap+0x5
> 	--- trap 0x3, eip = 0xc0614be5, esp = 0xd7250bd8, ebp = 0xd7250be4
> ---
> 	Debugger(c064a8cd,c06c16c0,c066feb4,c066feb4,c0670efe) at
> Debugger+0x55
> 	witness_lock(c06c16c0,0,c0670efe,24c,c155e070) at witness_lock+0x687
> 	_sx_slock(c06c16c0,c0670efe,24c,e0,0) at _sx_slock+0xae
> 	loadav(0,0,c067181f,e0,c0673a41) at loadav+0x25
> 	softclock(0,0,c066e338,23e,c1566528) at softclock+0x1fb
> 	ithread_loop(c3fb5300,d7250d48,c066e19e,315,0) at ithread_loop+0x192
> 	fork_exit(c04f9c90,c3fb5300,d7250d48) at fork_exit+0xb5
> 	fork_trampoline() at fork_trampoline+0x8
> 	--- trap 0x1, eip = 0, esp = 0xd7250d7c, ebp = 0 ---
> 	evxfevnt-0222 [09] AcpiDisable           : ACPI mode disabled
> 	syncing disks, buffers remaining... 44 44 44 44 44 44 44 44 44 44 44
> 44 44 44 44
> 	 44 44 44 44 44
> 	 
> 	 
> 	 
> 
> 		-----Original Message----- 
> 		From: owner-freebsd-current@freebsd.org on behalf of Robin P.
> Blanchard 
> 		Sent: Fri 1/16/2004 4:03 PM 
> 		To: Dag-Erling Smørgrav; Scott Long 
> 		Cc: current@freebsd.org 
> 		Subject: RE: Panic with this morning's (~9am EDT, 15 jan
> 2004) sources.
> 		
> 		
> 
> 		Ok... 
> 
> 		I got the machine back up and running (kernel and kernel.old
> were both 
> 		botched): grabbed the kernel from 
> 	
> ftp://snapshots.jp.freebsd.org/pub/FreeBSD/snapshots/i386/ISO-IMAGES/live-5.2
> -CURRENT-20040115-JPSNAP.iso. 
> 
> 		Below is a comparison between the two. Please let me know
> what else I can do 
> 		to help figure this one out. 
> 
> 		# ident /boot/rescue/kernel > ident.rescue 
> 		# ident /boot/kernel/kernel > ident.panic 
> 		# diff -u ident.rescue ident.panic  |fgrep "+" |fgrep
> "FreeBSD" 
> 
> 		+     $FreeBSD: src/sys/cam/scsi/scsi_pt.c,v 1.39 2003/06/10
> 18:14:05 obrien 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/cam/scsi/scsi_targ_bh.c,v 1.20
> 2003/09/30 08:03:52 
> 		simokawa Exp $ 
> 		+     $FreeBSD: src/sys/cam/scsi/scsi_target.c,v 1.58
> 2003/11/09 09:17:20 
> 		tanimura Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_cpu.c,v 1.29
> 2003/12/28 22:15:24 njl 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_ec.c,v 1.42
> 2004/01/03 02:01:39 njl 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_isab.c,v 1.4
> 2003/08/24 17:48:01 
> 		obrien Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_lid.c,v 1.15
> 2003/10/25 05:03:24 njl 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_pci.c,v 1.6
> 2003/09/17 08:32:44 
> 		iwasaki Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_pci_link.c,v 1.12
> 2003/12/23 02:29:46 
> 		peter Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_pcib.c,v 1.36
> 2003/12/18 17:04:11 kan 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_pcib_pci.c,v 1.5
> 2003/08/24 17:48:01 
> 		obrien Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_powerres.c,v 1.16
> 2003/08/28 16:06:30 
> 		njl Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_resource.c,v 1.20
> 2003/09/26 05:24:55 
> 		njl Exp $ 
> 		+     $FreeBSD: src/sys/dev/acpica/acpi_thermal.c,v 1.35
> 2004/01/12 17:59:10 
> 		njl Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-all.c,v 1.201 2004/01/14
> 21:26:34 sos Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-queue.c,v 1.16 2004/01/14
> 21:26:35 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-lowlevel.c,v 1.27
> 2004/01/14 21:26:35 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-isa.c,v 1.20 2004/01/14
> 21:26:35 sos Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-pci.c,v 1.74 2004/01/14
> 21:26:35 sos Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-chipset.c,v 1.56
> 2004/01/14 21:26:34 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-dma.c,v 1.125 2004/01/14
> 21:26:35 sos Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ata/ata-disk.c,v 1.167 2004/01/14
> 21:26:34 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/atapi-cd.c,v 1.160 2004/01/14
> 21:26:35 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/atapi-fd.c,v 1.92 2004/01/14
> 21:26:35 sos Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ata/atapi-tape.c,v 1.87
> 2004/01/14 21:26:35 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ata/atapi-cam.c,v 1.31 2004/01/14
> 21:26:35 sos 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ppbus/immio.c,v 1.17 2003/08/24
> 17:54:16 obrien 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/dev/ppbus/vpo.c,v 1.29 2003/08/24
> 17:54:16 obrien Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/dev/ppbus/vpoio.c,v 1.18 2003/08/24
> 17:54:16 obrien 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/kern/init_main.c,v 1.239 2004/01/15
> 10:15:03 des Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/kern/kern_descrip.c,v 1.221
> 2004/01/16 08:45:56 des 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/kern/sched_ule.c,v 1.94 2003/12/20
> 22:35:20 jeff Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/kern/sys_pipe.c,v 1.163 2004/01/15
> 10:15:03 des Exp $ 
> 		+     $FreeBSD: src/sys/kern/uipc_cow.c,v 1.16 2003/11/16
> 06:11:25 alc Exp $ 
> 		+     $FreeBSD: src/sys/kern/uipc_syscalls.c,v 1.169
> 2004/01/15 10:15:03 des 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/kern/uipc_usrreq.c,v 1.114 2004/01/15
> 10:15:03 des 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/kern/vfs_syscalls.c,v 1.336
> 2004/01/15 10:15:04 des 
> 		Exp $ 
> 		+     $FreeBSD: src/sys/kern/uipc_sem.c,v 1.9 2003/06/11
> 00:56:58 obrien Exp 
> 		$ 
> 		+     $FreeBSD: src/sys/i386/acpica/OsdEnvironment.c,v 1.9
> 2003/08/28 
> 		16:26:24 njl Exp $ 
> 		+     $FreeBSD: src/sys/i386/acpica/acpi_machdep.c,v 1.15
> 2003/11/01 00:18:29 
> 		njl Exp $ 
> 		+     $FreeBSD: src/sys/i386/acpica/acpi_wakeup.c,v 1.30
> 2003/11/03 22:18:57 
> 		jhb Exp $ 
> 		+     $FreeBSD: src/sys/i386/acpica/madt.c,v 1.9 2003/12/09
> 03:04:19 njl Exp 
> 		$ 
> 
> 		> 
> 		> Grabbed new code from cvsup1 this morning (~9am EDT, 16 jan
> 
>>04) and am now panicing in a different location: 
> 
> 		> 
> 		> FreeBSD/i386 bootstrap loader, Revision 1.1 
> 		> (root@bsdfs5.gactr.uga.edu, Fri Jan 16 11:10:18 EST 2004) 
> 		> Loading /boot/defaults/loader.conf /boot/kernel/kernel 
> 		> text=0x277880 data=0x2a264+0x56838
> syms=[0x4+0x36e70+0x4+0x4 
> 		> 3c03] /boot/modules/if_fxp.ko text=0x77b4 data=0x1014+0xc 
> 		> syms=[0x4+0xcf0+0x4+0xdbb] loading required module 'miibus'
> 
>>/boot/modules/miibus.ko text=0x15820 data=0xc84+0x68 
> 
> 		> syms=[0x4+0x1c60+0x4+0x2328 ] /boot/modules/twe.ko 
> 		> text=0x7398 data=0x5ac+0x8c syms=[0x4+0xdb0+0x4+0xd1d] 
> 		> Loading /boot/defaults/loader.conf 
> 		> - 
> 		> Hit [Enter] to boot immediately, or any other key for
> command 
> 		> prompt. Booting [/boot/kernel/kernel]... 
> 		> ACPI_DEBUG: set 'ACPI_EVENTS' 
> 		> ACPI_DEBUG: set 'ACPI_LV_ALL_EXCEPTIONS' 
> 		> ACPI debug layer 0x4 debug level 0x1f 
> 		> Copyright (c) 1992-2004 The FreeBSD Project. 
> 		> Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991,
> 1992, 
> 		> 1993, 1994 
> 		>         The Regents of the University of California. All 
> 		> rights reserved. FreeBSD 5.2-CURRENT #0: Fri Jan 16
> 11:58:59 EST 2004 
> 		>
> root@bsdfs5.gactr.uga.edu:/usr/obj/usr/src/sys/ule.debug 
> 		> Preloaded elf kernel "/boot/kernel/kernel" at 0xc07a7000. 
> 		> Preloaded elf module "/boot/modules/if_fxp.ko" at
> 0xc07a726c. 
> 		> Preloaded elf module "/boot/modules/miibus.ko" at
> 0xc07a7318. 
> 		> Preloaded elf module "/boot/modules/twe.ko" at 0xc07a73c4. 
> 		> Timecounter "i8254" frequency 1193182 Hz quality 0 
> 		> CPU: Intel Pentium III (851.94-MHz 686-class CPU) 
> 		>   Origin = "GenuineIntel"  Id = 0x68a  Stepping = 10 
> 		>  
> 		>
> Features=0x383f9ff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,SEP,MTRR 
> 		> ,PGE,MCA,CMOV,P 
> 		> A 
> 		> T,PSE36,MMX,FXSR,SSE> 
> 		> real memory  = 536608768 (511 MB) 
> 		> avail memory = 519680000 (495 MB) 
> 		> acquiring duplicate lock of same type: "filedesc structure"
> 
>> 1st filedesc structure @ /usr/src/sys/kern/kern_descrip.c:1377 
> 
> 		>  2nd filedesc structure @
> /usr/src/sys/kern/kern_descrip.c:1431 
> 		> Stack backtrace: 
> 		> backtrace(c0662f9a,c065e006,c065e5b2,597,1d8) at
> backtrace+0x17 
> 		> witness_lock(c1568838,8,c065e5b2,597,c1568800) at
> witness_lock+0x5aa 
> 		> _mtx_lock_flags(c1568838,0,c065e5b2,597,a) at
> _mtx_lock_flags+0x6a 
> 		> fdcopy(c06a9120,0,c065e9a0,1a5,c0685924) at fdcopy+0x46 
> 		> fork1(c06a8d60,60034,0,c0821d50,64) at fork1+0x61f 
> 		> kthread_create(c04f9930,0,0,40000,0,c065edc1) at
> kthread_create+0x48 
> 		> ktrace_init(0,81e000,81ec00,81e000,0) at ktrace_init+0xf5 
> 		> mi_startup() at mi_startup+0xb5 
> 		> begin() at begin+0x2c 
> 		> Debugger("witness_lock") 
> 		> Stopped at      Debugger+0x55:  xchgl   %ebx,in_Debugger.0 
> 		> db> show locks 
> 		> exclusive sleep mutex filedesc structure r = 0 (0xc06a9158)
> 
>>locked @ /usr/src/sy s/kern/kern_descrip.c:1377 exclusive 
> 
> 		> sleep mutex Giant r = 1 (0xc06ac580) locked @ 
> 		> /usr/src/sys/kern/kern_f ork.c:218 
> 		> db> tr 
> 		> Debugger(c063c331,c065e006,c065e5b2,597,1d8) at
> Debugger+0x55 
> 		> witness_lock(c1568838,8,c065e5b2,597,c1568800) at
> witness_lock+0x5bf 
> 		> _mtx_lock_flags(c1568838,0,c065e5b2,597,a) at
> _mtx_lock_flags+0x6a 
> 		> fdcopy(c06a9120,0,c065e9a0,1a5,c0685924) at fdcopy+0x46 
> 		> fork1(c06a8d60,60034,0,c0821d50,64) at fork1+0x61f 
> 		> kthread_create(c04f9930,0,0,40000,0,c065edc1) at
> kthread_create+0x48 
> 		> ktrace_init(0,81e000,81ec00,81e000,0) at ktrace_init+0xf5 
> 		> mi_startup() at mi_startup+0xb5 
> 		> begin() at begin+0x2c 
> 		> db> panic 
> 		> panic: from debugger 
> 		> cpuid = 0; 
> 		> Stack backtrace: 
> 		> backtrace(c0642d67,0,c0655970,c0821a94,100) at
> backtrace+0x17 
> 		> panic(c0655970,c0821b4c,c048a582,c0607825,0) at panic+0x141
> 
>>db_panic(c0607825,0,ffffffff,c0821ac0,c0821abc) at db_panic+0x12 
> 
> 		> db_command(c06a43e0,c067dc20,c06777c4,c06777c8,3) at
> db_command+0x272 
> 		> db_command_loop(c0607825,c0642d67,2,c0430859,0) at 
> 		> db_command_loop+0x95 
> 		> db_trap(3,0,0,80046,0) at db_trap+0xc5 
> 		> kdb_trap(3,0,c0821c18,31,0) at kdb_trap+0x14c 
> 		> trap(c0820018,c0600010,10,c068797c,c1568838) at trap+0x47a 
> 		> calltrap() at calltrap+0x5 
> 		> --- trap 0x3, eip = 0xc0607825, esp = 0xc0821c58, ebp =
> 0xc0821c64 --- 
> 		> Debugger(c063c331,c065e006,c065e5b2,597,1d8) at
> Debugger+0x55 
> 		> witness_lock(c1568838,8,c065e5b2,597,c1568800) at
> witness_lock+0x5bf 
> 		> _mtx_lock_flags(c1568838,0,c065e5b2,597,a) at
> _mtx_lock_flags+0x6a 
> 		> _mtx_lock_flags(c1568838,0,c065e5b2,597,a) at
> _mtx_lock_flags+0x6a 
> 		> fork1(c06a8d60,60034,0,c0821d50,64) at fork1+0x61f 
> 		> kthread_create(c04f9930,0,0,40000,0,c065edc1) at
> kthread_create+0x48 
> 		> ktrace_init(0,81e000,81ec00,81e000,0) at ktrace_init+0xf5 
> 		> mi_startup() at mi_startup+0xb5 
> 		> begin() at begin+0x2c 
> 		> Uptime: 1s 
> 		> WARNING: Driver mistake: make_dev(geom.ctl) called before 
> 		> SI_SUB_DRIVERS kernel trap 12 with interrupts disabled 
> 		> 
> 		> 
> 		> Fatal trap 12: page fault while in kernel mode 
> 		> cpuid = 0; apic id = 00 
> 		> fault virtual address   = 0x14 
> 		> fault code              = supervisor read, page not present
> 
>>instruction pointer     = 0x8:0xc04f53e4 
> 
> 		> stack pointer           = 0x10:0xc0821928 
> 		> frame pointer           = 0x10:0xc082196c 
> 		> code segment            = base 0x0, limit 0xfffff, type
> 0x1b 
> 		>                         = DPL 0, pres 1, def32 1, gran 1 
> 		> processor eflags        = resume, IOPL = 0 
> 		> current process         = 0 (swapper) 
> 		> kernel: type 12 trap, code=0 
> 		> Stopped at      fork1+0x414:    cmpl    %ebx,0x14(%eax) 
> 		> db> 
> 
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