panic: System call lstat returning with 1 locks held

[Scot Hetzel]

When I boot a Jan 13th or Jan 15th kernel, and then run
/usr/local/etc/cvsup/update.sh to update the local CVS repository, I
get the following panic:

panic: System call lstat returning with 1 locks held
cpuid = 0
KDB: enter: panic
[thread ; pid 1240 tid 10031]
stopped at kdb_enter+0x3d: movq $0,0x41b048(%rip)
db> show alllocks
db> show locks
db> bt
tracing pid 1240 tid 10031 td 0xffffff001c1ad360
kdb_enter() at kdb_enter+0x3d
panic() at panic+0x176
syscalls() at syscalls+0x66d
Xfast_syscalls() at Xfast_syscalls+0xab
--- syscall (0, FreeBSD ELF64, nosys), rip = 0x8009e87ec, rsp=
0x72ec50, rbp = 0x72ed28 ---

----
$ strings /boot/kernel_hp_debug/kernel | grep CURRENT
@(#)FreeBSD 8.0-CURRENT #0: Tue Jan 15 01:30:50 CST 2008
FreeBSD 8.0-CURRENT #0: Tue Jan 15 01:30:50 CST 2008
8.0-CURRENT

$ strings /boot/kernel_hp_debug.old/kernel | grep CURRENT
@(#)FreeBSD 8.0-CURRENT #0: Sun Jan 13 13:12:56 CST 2008
FreeBSD 8.0-CURRENT #0: Sun Jan 13 13:12:56 CST 2008
8.0-CURRENT
---

When I try to look at the core file that gets generated, kgdb is
having problems reading it:

hp010# cd /sys/amd64/compile/DV8135NR
hp010# kgdb -n 14 kernel.debug
kgdb: kvm_read: invalid address (0x1050000)
[GDB will not be able to debug user-mode threads:
/usr/lib/libthread_db.so: Undefined symbol "ps_pglobal_lookup"]
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 "amd64-marcel-freebsd".
Ready to go.  Enter 'tr' to connect to the remote target
with /dev/cuad0, 'tr /dev/cuad1' to connect to a different port
or 'trf portno' to connect to the remote target with the firewire
interface.  portno defaults to 5556.

Type 'getsyms' after connection to load kld symbols.

If you're debugging a local system, you can use 'kldsyms' instead
to load the kld symbols.  That's a less obnoxious interface.
During symbol reading...location expression too complex...
During symbol reading, unsupported tag: 'DW_TAG_const_type'.
Cannot access memory at address 0x0
(kgdb)

---

A Jan 9th kernel doesn't exhibit this problem with lstat when
/usr/local/etc/cvsup/update.sh is run.

Any suggestions to isolate this problem?

Scot
-------------- next part --------------
options	CONFIG_AUTOGENERATED
ident	DV8135NR-debug
machine	amd64
cpu	HAMMER
makeoptions	KODIR=/boot/${KERNEL}_hp_debug
makeoptions	DEBUG=-g
options	INCLUDE_CONFIG_FILE
options	WITNESS_SKIPSPIN
options	WITNESS
options	INVARIANT_SUPPORT
options	INVARIANTS
options	GDB
options	DDB
options	KDB
options	ATA_STATIC_ID
options	SMP
options	AUDIT
options	STOP_NMI
options	KBD_INSTALL_CDEV
options	_KPOSIX_PRIORITY_SCHEDULING
options	SYSVSEM
options	SYSVMSG
options	SYSVSHM
options	STACK
options	KTRACE
options	SCSI_DELAY=5000
options	COMPAT_FREEBSD7
options	COMPAT_FREEBSD6
options	COMPAT_FREEBSD5
options	COMPAT_FREEBSD4
options	COMPAT_IA32
options	COMPAT_43TTY
options	GEOM_LABEL
options	GEOM_PART_GPT
options	PSEUDOFS
options	PROCFS
options	CD9660
options	MSDOSFS
options	NTFS
options	NFS_ROOT
options	NFSSERVER
options	NFSCLIENT
options	MD_ROOT
options	UFS_GJOURNAL
options	UFS_DIRHASH
options	UFS_ACL
options	SOFTUPDATES
options	FFS
options	SCTP
options	INET6
options	INET
options	PREEMPTION
options	SCHED_ULE
options	KSE
options	GEOM_MBR
options	GEOM_BSD
device	isa
device	mem
device	io
device	uart_ns8250
device	cpufreq
device	acpi
device	pci
device	fdc
device	ata
device	atadisk
device	ataraid
device	atapicd
device	atapifd
device	atapist
device	scbus
device	ch
device	da
device	sa
device	cd
device	pass
device	ses
device	atkbdc
device	atkbd
device	psm
device	kbdmux
device	vga
device	splash
device	sc
device	agp
device	cbb
device	pccard
device	cardbus
device	sio
device	uart
device	miibus
device	rl
device	loop
device	random
device	ether
device	sl
device	ppp
device	tun
device	pty
device	md
device	gif
device	faith
device	firmware
device	bpf
device	uhci
device	ohci
device	ehci
device	usb
device	ugen
device	uhid
device	ukbd
device	ulpt
device	umass
device	ums
device	urio
device	uscanner
device	ucom
device	uark
device	ubsa
device	ubser
device	uftdi
device	uipaq
device	uplcom
device	uvisor
device	uvscom
device	firewire
device	sbp
device	fwe
device	fwip
device	dcons
device	dcons_crom