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Date: Tue, 29 Jul 1997 06:57:53 +0300 (EEST)
From: Heikki Suonsivu <hsu@mail.clinet.fi>
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Subject: kern/4186: nfsiod, panic, page fault in kernel mode (frequent)
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>Number:         4186
>Category:       kern
>Synopsis:       nfsiod, panic, page fault in kernel mode (frequent)
>Confidential:   no
>Severity:       serious
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jul 28 21:00:01 PDT 1997
>Last-Modified:
>Originator:     Heikki Suonsivu
>Organization:
Clinet, Espoo, Finland
>Release:        FreeBSD 2.2-STABLE i386
>Environment:

2.2-STABLE, upgraded to 20 th sup about a week ago.

>Description:

nfs clients seem to have become very unstable and keep locking up, usually
with a panic message on the console and sitting at "syncing disks".  This
did not happen with sup from about a month ago.

Fatal trap 12: page fault while in kernel mode
fault virtual address: 0x87654371
fault code: supervisor read, page not present
instruction pointer: 0x8:0xf0131acf
stack pointer: 0x10:0xefbffd7c
frame pointer: 0x10:0xefbffd8c
code segment: base 0x0, limit 0xfffff, type 0x1b
		DPL 0, pres 1, def 32 1, gran 1
processor eflags: interrupt enabled, resume, IOPL = 0
current process: 93 (nfsiod)
interupt mask: bio
panic: page fault

f013156c T _insmntque
f01315d8 T _vwakeup
f0131658 T _vinvalbuf
f0131890 T _bgetvp
f013192c T _brelvp
f01319bc T _pbgetvp
f0131a00 T _pbrelvp
f0131a3c T _reassignbuf
f0131b40 T _bdevvp
f0131bac T _checkalias
f0131cd8 T _vget
f0131dbc T _vref
f0131e04 T _vput
f0131e58 T _vrele
f0131f58 T _vflush
f013207c T _vclean

>How-To-Repeat:

Seems to happen often with heavy nfs use.

>Fix:
	

>Audit-Trail:
>Unformatted: