Bug 24018

Summary:	4.2-STABLE, 4.0-RELEASE fatal trap 12: page fault while in kernel mode when cp reads some RH 5.2 nfs files
Product:	Base System	Reporter:	paul <paul>
Component:	kern	Assignee:	freebsd-bugs (Nobody) <bugs>
Status:	Closed FIXED
Severity:	Affects Only Me
Priority:	Normal
Version:	4.2-STABLE
Hardware:	Any
OS:	Any

Description paul 2001-01-02 07:10:01 UTC

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...

Comment 1 iedowse freebsd_committer

2001-04-10 20:34:59 UTC

State Changed
From-To: open->feedback

Does this problem still exist? If so, please try to get a crashdump 
and a full gdb trace. There are details on how to do this in the 
handbook at 

http://www.freebsd.org/handbook/kerneldebug.html

Comment 2 iedowse freebsd_committer

2001-09-26 20:05:21 UTC

State Changed
From-To: feedback->closed

Feedback timeout.