kern/40757: Kernel spinning in tmpfs

[joerg%NetBSD.org@localhost]

>Number:         40757
>Category:       kern
>Synopsis:       Kernel spinning in tmpfs
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Wed Feb 25 19:10:00 +0000 2009
>Originator:     Joerg Sonnenberger
>Release:        NetBSD 5.0rc2
>Organization:
TNF
>Environment:
>Description:
A processing is consuming 100% time on the affected CPU. The accounting on that 
CPU is broken as well, e.g. top shows 0% for all stats.

Backtrace on the cpu:
mutex_vector_enter() at netbsd:mutex_vector_enter+0x104
tmpfs_alloc_vp() at netbsd:tmpfs_alloc_vp+0x29
tmpfs_lookup() at netbsd:tmpfs_lookup+0x325
VOP_LOOKUP() at netbsd:VOP_LOOKUP+0x80
getcwd_common() at netbsd:getcwd_common+0x304
vn_isunder() at netbsd:vn_isunder+0x1e
lookup() at netbsd:lookup+0x249
namei() at netbsd:namei+0x1a4
vn_open() at netbsd:vn_open+0x95
sys_open() at netbsd:sys_open+0xeb
syscall() at netbsd:syscall+0xb6

>How-To-Repeat:

>Fix: