Kernel panic and general question on stability for FreeBSD 8 xen domU

[Gót András]

Hi,

Did you give more than one vcpus to the guest?

Regards,

Andras

Fred Crandall wrote:
> Hi there all,
> 
> I have a paravirtualized  FreeBSD 8 xen domU going that I have
> intermittent and repeatable kernel panic issues with. This is using a
> i386 xen paravirtualized kernel from up to date (as of this morning at
> the latest try) RELENG_8 sources. Ive tried this on a linux 64bit dom0
> and 32bit dom0 both running xen 3.4.2.  The kernel will panic at
> random from anywhere form a few hours to a few days with:
> 
> panic: mutex vm page queue mutex not owned at
> /usr/src/sys/i386/xen/xen_machdep.c:431
> KDB: enter: panic
> 
> Fairly low load when this happens, currently the domU machine only
> runs some minor sendmail load. I can also get the domU virtual to
> kernel panic in the same way on demand by having the configure script
> run on the libgcrypt port or by running and exiting memtest. The
> libgcrypt issue being the same as described in PR 140313.
> 
> Also tried running the domU kernel without SMP support, I see the same results.
> 
> So curious if anyone has any ideas on something Im missing or if
> others see similar issues on a RELENG_8 i386 xen kernel.
> 
> Below, is also my current kernel configuration.
> 
> cpu		I686_CPU
> ident		XEN
> 
> makeoptions	DEBUG=-g		# Build kernel with gdb(1) debug symbols
> makeoptions	MODULES_OVERRIDE=""
> 
> options 	SCHED_ULE		# ULE scheduler
> options 	PREEMPTION		# Enable kernel thread preemption
> #options 	SCHED_4BSD		
> 
> options 	INET			# InterNETworking
> options 	INET6			# IPv6 communications protocols
> options 	SCTP			# Stream Control Transmission Protocol
> 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 	UFS_GJOURNAL		# Enable gjournal-based UFS journaling
> options 	NFSCLIENT		# Network Filesystem Client
> options 	NFSSERVER		# Network Filesystem Server
> options 	NFSLOCKD		# Network Lock Manager
> options 	NFS_ROOT		# NFS usable as /, requires NFSCLIENT
> options 	MSDOSFS			# MSDOS Filesystem
> options 	CD9660			# ISO 9660 Filesystem
> options 	PROCFS			# Process filesystem (requires PSEUDOFS)
> options 	PSEUDOFS		# Pseudo-filesystem framework
> options 	GEOM_PART_GPT		# GUID Partition Tables.
> options 	GEOM_LABEL		# Provides labelization
> options 	COMPAT_43TTY		# BSD 4.3 TTY compat (sgtty)
> options 	COMPAT_FREEBSD4		# Compatible with FreeBSD4
> options 	COMPAT_FREEBSD5		# Compatible with FreeBSD5
> options 	COMPAT_FREEBSD6		# Compatible with FreeBSD6
> options 	COMPAT_FREEBSD7		# Compatible with FreeBSD7
> options 	KTRACE			# ktrace(1) support
> options 	STACK			# stack(9) support
> options 	SYSVSHM			# SYSV-style shared memory
> options 	SYSVMSG			# SYSV-style message queues
> options 	SYSVSEM			# SYSV-style semaphores
> options 	_KPOSIX_PRIORITY_SCHEDULING # POSIX P1003_1B real-time extensions
> options 	KBD_INSTALL_CDEV	# install a CDEV entry in /dev
> options 	AUDIT			# Security event auditing
> 
> # Debugging for use in -current
> options 	KDB			# Enable kernel debugger support.
> options 	DDB			# Support DDB.
> options 	GDB			# Support remote GDB.
> options 	INVARIANTS		# Enable calls of extra sanity checking
> options 	INVARIANT_SUPPORT	# Extra sanity checks of internal
> structures, required by INVARIANTS
> options 	WITNESS			# Enable checks to detect deadlocks and cycles
> options 	WITNESS_SKIPSPIN	# Don't run witness on spinlocks for speed
> 
> options 	PAE
> nooption	NATIVE
> option		XEN
> nodevice	atpic
> nodevice	isa
> options 	MCLSHIFT=12
> 
> options         IPFIREWALL
> # To make an SMP kernel, the next two lines are needed
> #options 	SMP			# Symmetric MultiProcessor Kernel
> #device		apic			# I/O APIC
> 
> 
> device		atkbdc		# AT keyboard controller
> device		atkbd		# AT keyboard
> device		psm		# PS/2 mouse
> device		pci
> 
> device		kbdmux		# keyboard multiplexer
> 
> # Pseudo devices.
> device		loop		# Network loopback
> device		random		# Entropy device
> device		ether		# Ethernet support
> device		tun		# Packet tunnel.
> device		pty		# Pseudo-ttys (telnet etc)
> device		md		# Memory "disks"
> device		gif		# IPv6 and IPv4 tunneling
> device		faith		# IPv6-to-IPv4 relaying (translation)
> 
> # 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
> 
> 
> The domU kernel is booted via pvgrub, ther kernel called via:
> 
> kernel /boot/kernel/kernel
> vfs.root.mountfrom=ufs:xbd0s1a,kern.hz=100,xencons=tty
> 
> 
> Thanks all,
> 
> Fred
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