kern/46221: Kernel panic in NFS server code

[tron%zhadum.org.uk@localhost]

>Number:         46221
>Category:       kern
>Synopsis:       Kernel panic in NFS server code
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Mar 18 15:55:00 +0000 2012
>Originator:     Matthias Scheler
>Release:        NetBSD 6.0_BETA 2012-03-16 sources with fix for PR kern/45677
>Organization:
Matthias Scheler                                  http://zhadum.org.uk/
>Environment:
System: NetBSD colwyn.zhadum.org.uk 6.0_BETA NetBSD 6.0_BETA (COLWYN.64) #0: 
Fri Mar 16 13:40:20 GMT 2012 
tron%colwyn.zhadum.org.uk@localhost:/src/sys/compile/COLWYN.64 amd64
Architecture: x86_64
Machine: amd64
>Description:
My NetBSD/amd646 6.0_BETA server has crashed three times during access by
a Mac OS X NFS client. It rebooted twice. But in one case it got stuck
and I could copy this traceback from the console:

printf_nolog() at netbsd:printf_nolog
wddump() at netbsd:wddump+0x23d
raiiddump() at netbsd:raiddump+0x227
dumpsys_seg() at netbsd:dumpsys_seg+0xb9
dump_seg_iter() at netbsd:dump_seg_iter+0xfb
dodumpsys() at netbsd:dodumpsys+0x273
dumpsys() at netbsd:dumpsys+0x1d
vpanic() at netbsd:vpanic+0x1dd
printf_nolog() at netbsd:printf_nolog
startlwp() at netbsd:startlwp
alltraps() at netbsd:alltraps+0xa2
ffs_fhtovp() at netbsd:ffs_fhtovp+0x55
VFS_FHTOVP() at netbsd:UFS_FHTOUP+0x1c
nfsrv_fhtovp() at netbsd:nfsrv_fhtovp+0x9a
nfsrv_read() at netbsd:nfsrv_read+0x245
nfssvc_nfsd() at netbsd:nfssvc_nfsd+0x1ce
sys_nfssvc() at netbsd:sys_nfssvc+0x22d 
syscall() at netbsd:syscall+0xc4
cpu1: End traceback...
sd0(umass0:0:0:0): generic HEA error
sd0: cache synchronization failed
fatal page fault in supervisor mode
trap type 6 code 10 rip 0 cs 8 rflags 10286 cr2 0 cpl 4 rsp fffffe810e95dc48

There might be typos in the above. The original is here:

http://zhadum.org.uk/~tron/panic.png

>How-To-Repeat:
1.) Use a NetBSD 6.0_BETA machine as an NFS server for a Mac OS X Snow Leopard
    client.
2.) Login as a user with an NFS mounted home directory.
3.) Start Apple's "Mail" application.

>Fix:
Not known. It didn't happen under NetBSD 5.1_STABLE.