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Subject: kern/24018: 4.2-STABLE, 4.0-RELEASE fatal trap 12: page fault while in kernel mode when cp reads some RH 5.2 nfs files
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>Number:         24018
>Category:       kern
>Synopsis:       4.2-STABLE, 4.0-RELEASE fatal trap 12: page fault while in kernel mode when cp reads some RH 5.2 nfs files
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Mon Jan 01 23:10:01 PST 2001
>Closed-Date:
>Last-Modified:
>Originator:     G. Paul Ziemba
>Release:        4.2-STABLE
>Organization:
>Environment:
FreeBSD hairball.treehouse.napa.ca.us 4.2-STABLE FreeBSD 4.2-STABLE #0: Sat Dec 30 12:51:25 PST 2000     paul@hairball.treehouse.napa.ca.us:/usr/obj/usr/src/sys/GPZDEBUG  i386
>Description:
I have a Redhat 5.2 NFS server, which the FreeBSD 4.2-STABLE system
mounts. When I run cp on the FreeBSD system to copy files from the RH5.2
system to the FreeBSD system, on some files FreeBSD crashes. I started
with 4.0-RELEASE; upgraded to 4.2-STABLE but no improvement. I got the
latest 4.2-STABLE as of Dec 28, 2000.

The files being copied are not of unusual size (less than 100KB).

I tried objdump --disassemble --source on kernel.debug but I couldn't
get the nfs_readrpc code to show up intermixed with the assembler,
so couldn't go any further. I'd be happy to dig further if someone
could explain what I should do.

DDB output (hand-entered):

_end(c651d380,c0a06f00,6,c65045e0,c0de1d80) at 0xc4d18140
nfs_readrpc(c651d380,c651bb14,c0de1d80,c4d18000,c651bbe0) at nfs_readrpc+0x556
nfs_getpages(c651bb4c) at nfs_getpages+0x131
vnode_pager_getpages(c652c240,c651bbe0,1,0,c65045e0) at vnode_pager_getpages+0x4e
vm_fault(c5fbe080,28064000,1,0,c6504500) at vm_fault+0x4ea
etc...
>How-To-Repeat:

>Fix:


>Release-Note:
>Audit-Trail:
>Unformatted:


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