kern/40549: Reader / writer lock error: rw_vector_enter: locking against myself

[raymond.meyer%rambler.ru@localhost]

>Number:         40549
>Category:       kern
>Synopsis:       Reader / writer lock error: rw_vector_enter: locking against 
>myself
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Feb 03 17:00:00 +0000 2009
>Originator:     RM
>Release:        
>Organization:
>Environment:
NetBSD ultra10 5.0_BETA NetBSD 5.0_BETA (GENERIC) #0: Sat Jan 24 11:11:56 PST 
2009  
builds@wb31:/home/builds/ab/netbsd-5/sparc64/200901240002Z-obj/home/builds/ab/netbsd-5/src/sys/arch/sparc64/compile/GENERIC
 sparc64
>Description:
I can reproduce this panic if I:

mount /proc filesystem
try to build sysutils/xfce4-diskperf-plugin package from pkgsrc

With the /proc filesystem unmounted, the panic does not occur.

$ uname -a
NetBSD ultra10 5.0_BETA NetBSD 5.0_BETA (GENERIC) #0: Sat Jan 24 11:11:56 PST 
2009  
builds@wb31:/home/builds/ab/netbsd-5/sparc64/200901240002Z-obj/home/builds/ab/netbsd-5/src/sys/arch/sparc64/compile/GENERIC
 sparc64

Below are the details captured via ssh and serial console:

===> Configuring for xfce4-diskperf-plugin-2.1.0
=> Modifying GNU configure scripts to avoid --recheck
=> Replacing config-guess with pkgsrc versions
=> Replacing config-sub with pkgsrc versions
=> Replacing install-sh with pkgsrc version
=> Fixing locale directory references.
configure: WARNING: If you wanted to set the --build type, don't use --host.
If a cross compiler is detected then cross compile mode will be used.
checking build system type... sparc64-unknown-netbsd5.0.
checking host system type... sparc64--netbsd
checking target system type... sparc64--netbsd
checking for a BSD-compatible install... /usr/bin/install -c -o root -g wheel
checking whether build environment is sane... yes
checking for a thread-safe mkdir -p... ./install-sh -c -d
checking for gawk... /usr/bin/awk
checking whether make sets $(MAKE)... yes
checking for sparc64--netbsd-strip... no
checking for strip... strip
checking how to create a ustar tar archive... 

Reader / writer lock error: rw_vector_enter: locking against myself

lock address : 0x000000000f234878
current cpu  :                  0
current lwp  : 0x000000000d8140c0
owner/count  : 0x000000000d8140c0 flags    : 0x0000000000000004

panic: lock error
Stopped in pid 1660.1 (gtar) at netbsd:cpu_Debugger+0x4:        nop
db> bt

lockdebug_abort(f234878, 181be40, 14f1148, 16506b8, 0, 1) at netbsd:lockdebug_ab
ort+0x24
rw_vector_enter(f234878, 1, 0, 1, 0, e9331b8) at netbsd:rw_vector_enter+0x130
vlockmgr(f234878, 2, 0, a, 0, 0) at netbsd:vlockmgr+0x110
VOP_LOCK(f234640, 2, 0, 1, 0, e930000) at netbsd:VOP_LOCK+0x58
vn_lock(f234640, 20002, 2, 2, 4, d80e8c0) at netbsd:vn_lock+0x84
getcwd_common(f234640, d920140, e933718, 3384000, 200, 0) at netbsd:getcwd_commo
n+0x3c
procfs_readlink(16, 2, 2, 10, 0, 0) at netbsd:procfs_readlink+0x35c
layer_bypass(e933920, e933b50, e933b78, ffffffffffff88f8, 1, 2f) at netbsd:layer
_bypass+0xc8
VOP_READLINK(f2343e0, e933a10, d6b7980, 0, 0, 1) at netbsd:VOP_READLINK+0x5c
namei(0, ffffffffffff9aa5, e933b78, e933b28, 4, ffffffffffff9aa3) at netbsd:name
i+0x1bc
do_sys_stat(ffffffffffff9a93, 54, e933c78, 0, 0, 0) at netbsd:do_sys_stat+0x20
sys___stat30(d8140c0, e933dc0, e933e00, fefefefefefefeff, ffffffffffffffff, 1818
be8) at netbsd:sys___stat30+0x10
syscall_plain(e933ed0, 2, 4073ef34, 4073ef38, 0, e933dc0) at netbsd:syscall_plai
n+0x138
?(ffffffffffff9a93, ffffffffffff9a08, 4, 13ef80, 0, 40a00098) at 0x1008c68
>How-To-Repeat:

>Fix: