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Date:      Sun, 22 Apr 2007 13:26:45 +0100 (BST)
From:      Robert Watson <rwatson@FreeBSD.org>
To:        Scott Long <scottl@samsco.org>
Cc:        freebsd-fs@freebsd.org, Ollivier Robert <roberto@keltia.freenix.fr>, FreeBSD Current Users' list <freebsd-current@freebsd.org>, pjd@freebsd.org
Subject:   Re: ZFS/UMA panic under Parallels
Message-ID:  <20070422132607.T9911@fledge.watson.org>
In-Reply-To: <462B3E00.1070001@samsco.org>
References:  <20070422102834.GA39121@keltia.freenix.fr> <462B3E00.1070001@samsco.org>

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On Sun, 22 Apr 2007, Scott Long wrote:

> This is actually a problem with the ATA driver, not ZFS.  I think people are 
> also seeing it under VMWare.  The ATA driver is misusing semaphores in a way 
> that isn't reliable in the emulated environment.

I saw what sounds like an identical panic in Parallels last week, and sent a 
screenshot off to Soren.  He asked me to follow up with more specific version 
information but I've not yet been able to do that.

Robert N M Watson
Computer Laboratory
University of Cambridge

>
> Scott
>
>
> Ollivier Robert wrote:
>> Hello,
>> 
>> I'm running CURRENT inside a Parallels VM and I am getting regular panic
>> when writing to a ZFS raidz pool.  UMA is complaining and panic().
>> 
>> It is rather easy to reproduce (cvs update, rsync all generates such
>> panics).  Another interesing point is that it always occurs after
>> FLUSHCACHE TIMEOUT messages.
>> 
>> The pool is made of 3 slices ad0s2 ad0s3 from the first virtual disk and
>> ad2s1 from a second virtual disk (to get 3 "disks" for raidz).
>> 
>> Filesystem               1024-blocks    Used    Avail Capacity  Mounted on
>> /dev/ad0s1a                  9647558 2708134  6167620    31%    /
>> devfs                              1       1        0   100%    /dev
>> tank/home                   19787392     128 19787264     0%    /home
>> tank                        19787264       0 19787264     0%    /tank
>> tank/usr                    19902336  115072 19787264     1%    /tank/usr
>> tank/usr/obj                19787264       0 19787264     0% 
>> /tank/usr/obj
>> tank/usr/ports              19796224    8960 19787264     0% 
>> /tank/usr/ports
>> tank/usr/ports/distfiles    19787264       0 19787264     0% 
>> /tank/usr/ports/distfiles
>> tank/usr/src                19983360  196096 19787264     1% 
>> /tank/usr/src
>> 
>> -----
>> GNU gdb 6.1.1 [FreeBSD]
>> Copyright 2004 Free Software Foundation, Inc.
>> GDB is free software, covered by the GNU General Public License, and you 
>> are
>> welcome to change it and/or distribute copies of it under certain 
>> conditions.
>> Type "show copying" to see the conditions.
>> There is absolutely no warranty for GDB.  Type "show warranty" for details.
>> This GDB was configured as "i386-marcel-freebsd".
>> 
>> Unread portion of the kernel message buffer:
>> ad0: FAILURE - FLUSHCACHE timed out
>> ad2: FAILURE - FLUSHCACHE timed out
>> Slab at 0xc2b90f70, freei 18 = 0.
>> panic: Duplicate free of item 0xc2b90948 from zone 0xc1061780(g_bio)
>> 
>> cpuid = 0
>> KDB: enter: panic
>> panic: from debugger
>> cpuid = 0
>> Uptime: 7m28s
>> Physical memory: 503 MB
>> Dumping 172 MB: 157 141 125 109 93 77 61 45 29 13
>> 
>> #0  doadump () at pcpu.h:172
>> 172		__asm __volatile("movl %%fs:0,%0" : "=r" (td));
>> (kgdb) where
>> #0  doadump () at pcpu.h:172
>> #1  0xc0525a40 in boot (howto=260) at ../../../kern/kern_shutdown.c:409
>> #2  0xc0525d4a in panic (fmt=0xc0680204 "from debugger")
>>     at ../../../kern/kern_shutdown.c:563
>> #3  0xc044a13e in db_panic (addr=-1068219313, have_addr=0, count=-1, 
>> modif=0xdceb09e0 "") at ../../../ddb/db_command.c:433
>> #4  0xc044a0d7 in db_command (last_cmdp=0xc0705f64, cmd_table=0x0)
>>     at ../../../ddb/db_command.c:401
>> #5  0xc044a192 in db_command_loop () at ../../../ddb/db_command.c:453
>> #6  0xc044bddd in db_trap (type=3, code=0) at ../../../ddb/db_main.c:222
>> #7  0xc0544728 in kdb_trap (type=3, code=0, tf=0xdceb0b78)
>>     at ../../../kern/subr_kdb.c:502
>> #8  0xc0658871 in trap (frame=0xdceb0b78) at ../../../i386/i386/trap.c:621
>> #9  0xc064319b in calltrap () at ../../../i386/i386/exception.s:139
>> #10 0xc054444f in kdb_enter (msg=0x12 <Address 0x12 out of bounds>)
>>     at cpufunc.h:60
>> #11 0xc0525cfc in panic (
>>     fmt=0xc06ac621 "Duplicate free of item %p from zone %p(%s)\n")
>>     at ../../../kern/kern_shutdown.c:547
>> #12 0xc06118f4 in uma_dbg_free (zone=0xc1061780, slab=0xc2b90f70, 
>> item=0xc2b90948) at ../../../vm/uma_dbg.c:302
>> #13 0xc06100f3 in uma_zfree_arg (zone=0xc1061780, item=0xc2b90948, 
>> udata=0x0)
>>     at ../../../vm/uma_core.c:2261
>> #14 0xc04f207b in g_destroy_bio (bp=0xc2b90948) at uma.h:305
>> #15 0xc04f090a in g_disk_done (bp=0xc2b90948) at 
>> ../../../geom/geom_disk.c:209
>> #16 0xc05736e0 in biodone (bp=0xc2b90948) at ../../../kern/vfs_bio.c:3006
>> #17 0xc045f8c2 in ad_done (request=0xc2b7b480)
>>     at ../../../dev/ata/ata-disk.c:304
>> #18 0xc0464f50 in ata_completed (context=0xc2b7b480, dummy=0)
>>     at ../../../dev/ata/ata-queue.c:479
>> #19 0xc054bd0c in taskqueue_run (queue=0xc2a0a080)
>>     at ../../../kern/subr_taskqueue.c:255
>> #20 0xc054bea2 in taskqueue_swi_run (dummy=0x0)
>>     at ../../../kern/subr_taskqueue.c:297
>> #21 0xc0510f19 in ithread_execute_handlers (p=0xc299e240, ie=0xc2a0a000)
>>     at ../../../kern/kern_intr.c:682
>> #22 0xc0511047 in ithread_loop (arg=0xc2a12010)
>>     at ../../../kern/kern_intr.c:766
>> #23 0xc0510018 in fork_exit (callout=0xc0510fe0 <ithread_loop>, 
>> arg=0xc2a12010, frame=0xdceb0d38) at ../../../kern/kern_fork.c:814
>> #24 0xc0643210 in fork_trampoline () at ../../../i386/i386/exception.s:205
>> -----
>> 
>> dmesg
>> -----
>> Copyright (c) 1992-2007 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 is a registered trademark of The FreeBSD Foundation.
>> FreeBSD 7.0-CURRENT #0: Sun Apr 22 11:05:32 CEST 2007
>>     roberto@vm1.keltia.net:/usr/osrc/sys/i386/compile/VM7
>> Timecounter "i8254" frequency 1193182 Hz quality 0
>> CPU: Intel(R) Core(TM)2 CPU         T7600  @ 2.33GHz (1524.50-MHz 686-class 
>> CPU)
>>   Origin = "GenuineIntel"  Id = 0x6f6  Stepping = 6
>>   Features=0xf80b9b9<FPU,PSE,TSC,MSR,MCE,CX8,SEP,MTRR,PGE,CMOV,MMX,FXSR,SSE,SSE2,SS>
>>   Features2=0x1<SSE3>
>> real memory  = 536870912 (512 MB)
>> avail memory = 515600384 (491 MB)
>> kbd1 at kbdmux0
>> cpu0 on motherboard
>> pcib0: <Intel 82815 (i815 GMCH) Host To Hub bridge> pcibus 0 on motherboard
>> pir0: <PCI Interrupt Routing Table: 9 Entries> on motherboard
>> pci0: <PCI bus> on pcib0
>> vgapci0: <VGA-compatible display> port 0x4000-0x40ff,0x4400-0x441f mem 
>> 0xc0000000-0xc0ffffff at device 2.0 on pci0
>> pci0: <bridge> at device 3.0 (no driver attached)
>> ed0: <RealTek 8029> port 0x4c00-0x4c1f irq 10 at device 5.0 on pci0
>> ed0: [ITHREAD]
>> ed0: using obsoleted if_watchdog interface
>> ed0: Ethernet address: 00:ee:42:8a:ed:eb
>> uhci0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> port 
>> 0x5000-0x501f irq 11 at device 29.0 on pci0
>> uhci0: [GIANT-LOCKED]
>> uhci0: [ITHREAD]
>> usb0: <Intel 82801FB/FR/FW/FRW (ICH6) USB controller USB-A> on uhci0
>> usb0: USB revision 1.0
>> uhub0: <Intel UHCI root hub, class 9/0, rev 1.00/1.00, addr 1> on usb0
>> uhub0: 2 ports with 2 removable, self powered
>> ehci0: <Intel 82801FB (ICH6) USB 2.0 controller> mem 0xc1000000-0xc10003ff 
>> irq 9 at device 29.7 on pci0
>> ehci0: [GIANT-LOCKED]
>> ehci0: [ITHREAD]
>> usb1: EHCI version 1.0
>> usb1: wrong number of companions (0 != 1)
>> usb1: <Intel 82801FB (ICH6) USB 2.0 controller> on ehci0
>> usb1: USB revision 2.0
>> uhub1: <Intel EHCI root hub, class 9/0, rev 2.00/1.00, addr 1> on usb1
>> uhub1: 8 ports with 8 removable, self powered
>> agp0: <Intel 82815 (i815 GMCH) host to PCI bridge> on hostb0
>> isab0: <PCI-ISA bridge> at device 31.0 on pci0
>> isa0: <ISA bus> on isab0
>> atapci0: <Intel ICH2 UDMA100 controller> port 
>> 0x1f0-0x1f7,0x3f6,0x170-0x177,0x376,0x6c00-0x6c0f at device 31.1 on pci0
>> ata0: <ATA channel 0> on atapci0
>> ata0: [ITHREAD]
>> ata1: <ATA channel 1> on atapci0
>> ata1: [ITHREAD]
>> pci0: <multimedia, audio> at device 31.5 (no driver attached)
>> pmtimer0 on isa0
>> orm0: <ISA Option ROM> at iomem 0xc0000-0xc9fff pnpid ORM0000 on isa0
>> sc0: <System console> at flags 0x100 on isa0
>> sc0: VGA <16 virtual consoles, flags=0x300>
>> vga0: <Generic ISA VGA> at port 0x3c0-0x3df iomem 0xa0000-0xbffff on isa0
>> atkbdc0: <Keyboard controller (i8042)> at port 0x60,0x64 on isa0
>> atkbd0: <AT Keyboard> irq 1 on atkbdc0
>> kbd0 at atkbd0
>> atkbd0: [GIANT-LOCKED]
>> atkbd0: [ITHREAD]
>> psm0: <PS/2 Mouse> irq 12 on atkbdc0
>> psm0: [GIANT-LOCKED]
>> psm0: [ITHREAD]
>> psm0: model IntelliMouse Explorer, device ID 4
>> sio0: configured irq 4 not in bitmap of probed irqs 0
>> sio0: port may not be enabled
>> sio0: configured irq 4 not in bitmap of probed irqs 0
>> sio0: port may not be enabled
>> sio0 at port 0x3f8-0x3ff irq 4 flags 0x10 on isa0
>> sio0: type 8250 or not responding
>> sio0: [FILTER]
>> sio1: configured irq 3 not in bitmap of probed irqs 0
>> sio1: port may not be enabled
>> Timecounter "TSC" frequency 1524502532 Hz quality 800
>> Timecounters tick every 1.000 msec
>> ad0: 32000MB <Virtual HDD [0] FWR10003> at ata0-master UDMA100
>> acd0: CDROM <PRL CD-ROM [1]/FWR10003> at ata0-slave PIO4
>> ad2: 10000MB <Virtual HDD [2] FWR10003> at ata1-master UDMA100
>> WARNING: ZFS is considered to be an experimental feature in FreeBSD.
>> Trying to mount root from ufs:/dev/ad0s1a
>> ZFS filesystem version 6
>> ZFS storage pool version 6
>> -----
>> 
>> VM7
>> -----
>> #
>> # VM7 -- Generic kernel configuration file for FreeBSD/i386
>> #
>> # $FreeBSD: src/sys/i386/conf/GENERIC,v 1.460 2006/12/13 03:41:47 yongari 
>> Exp $
>> 
>> cpu		I686_CPU
>> ident		VM7
>> 
>> 
>> makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug 
>> symbols
>> 
>> options 	SCHED_4BSD		# 4BSD scheduler
>> options 	PREEMPTION		# Enable kernel thread preemption
>> options 	INET			# InterNETworking
>> options 	INET6			# IPv6 communications protocols
>> options 	FFS			# Berkeley Fast Filesystem
>> options 	SOFTUPDATES		# Enable FFS soft updates support
>> options 	UFS_ACL			# Support for access control lists
>> options 	UFS_DIRHASH		# Improve performance on big 
>> directories
>> options 	COMPAT_43TTY		# BSD 4.3 TTY compat [KEEP THIS!]
>> options 	COMPAT_FREEBSD4		# Compatible with FreeBSD4
>> options 	COMPAT_FREEBSD5		# Compatible with FreeBSD5
>> options 	COMPAT_FREEBSD6		# Compatible with FreeBSD6
>> options 	KTRACE			# ktrace(1) support
>> options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time 
>> extensions
>> options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
>> options 	ADAPTIVE_GIANT		# Giant mutex is adaptive.
>> options 	STOP_NMI		# Stop CPUS using NMI instead of IPI
>> 
>> # Debugging for use in -current
>> options 	KDB			# Enable kernel debugger support.
>> options 	DDB			# Support DDB.
>> options 	INVARIANTS		# Enable calls of extra sanity 
>> checking
>> options 	INVARIANT_SUPPORT	# Extra sanity checks of internal 
>> structures, required by INVARIANTS
>> 
>> # To make an SMP kernel, the next two lines are needed
>> options 	SMP			# Symmetric MultiProcessor Kernel
>> device		apic			# I/O APIC
>> 
>> # Bus support.
>> device		pci
>> 
>> # Floppy drives
>> device		fdc
>> 
>> # ATA and ATAPI devices
>> device		ata
>> device		atadisk		# ATA disk drives
>> device		ataraid		# ATA RAID drives
>> device		atapicd		# ATAPI CDROM drives
>> options 	ATA_STATIC_ID	# Static device numbering
>> 
>> # SCSI peripherals
>> device		scbus		# SCSI bus (required for SCSI)
>> device		da		# Direct Access (disks)
>> device		cd		# CD
>> device		pass		# Passthrough device (direct SCSI 
>> access)
>> 
>> # atkbdc0 controls both the keyboard and the PS/2 mouse
>> device		atkbdc		# AT keyboard controller
>> device		atkbd		# AT keyboard
>> device		psm		# PS/2 mouse
>> 
>> device		kbdmux		# keyboard multiplexer
>> 
>> device		vga		# VGA video card driver
>> 
>> device		splash		# Splash screen and screen saver 
>> support
>> 
>> # syscons is the default console driver, resembling an SCO console
>> device		sc
>> 
>> device		agp		# support several AGP chipsets
>> 
>> # Power management support (see NOTES for more options)
>> #device		apm
>> # Add suspend/resume support for the i8254.
>> device		pmtimer
>> 
>> # Serial (COM) ports
>> device		sio		# 8250, 16[45]50 based serial ports
>> device		uart		# Generic UART driver
>> 
>> # PCI Ethernet NICs.
>> device		de		# DEC/Intel DC21x4x (``Tulip'')
>> device		em		# Intel PRO/1000 adapter Gigabit 
>> Ethernet Card
>> device		ixgb		# Intel PRO/10GbE Ethernet Card
>> device		le		# AMD Am7900 LANCE and Am79C9xx PCnet
>> device		txp		# 3Com 3cR990 (``Typhoon'')
>> device		vx		# 3Com 3c590, 3c595 (``Vortex'')
>> 
>> # PCI Ethernet NICs that use the common MII bus controller code.
>> # NOTE: Be sure to keep the 'device miibus' line in order to use these 
>> NICs!
>> device		miibus		# MII bus support
>> device		ed		# NE[12]000, SMC Ultra, 3c503, DS8390 
>> cards
>> 
>> device		loop		# Network loopback
>> device		random		# Entropy device
>> device		ether		# Ethernet support
>> device		tun		# Packet tunnel.
>> device		pty		# Pseudo-ttys (telnet etc)
>> 
>> # The `bpf' device enables the Berkeley Packet Filter.
>> # Be aware of the administrative consequences of enabling this!
>> # Note that 'bpf' is required for DHCP.
>> device		bpf		# Berkeley packet filter
>> 
>> # USB support
>> device		uhci		# UHCI PCI->USB interface
>> device		ohci		# OHCI PCI->USB interface
>> device		ehci		# EHCI PCI->USB interface (USB 2.0)
>> device		usb		# USB Bus (required)
>> device		ugen		# Generic
>> device		ukbd		# Keyboard
>> device		umass		# Disks/Mass storage - Requires scbus 
>> and da
>> device		ums		# Mouse
>> 
>> # FireWire support
>> device		firewire	# FireWire bus code
>> device		sbp		# SCSI over FireWire (Requires scbus 
>> and da)
>> device		fwe		# Ethernet over FireWire 
>> (non-standard!)
>> -----
>
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