Date: Tue, 18 Apr 2000 12:42:46 -0400 From: "Matthew Zahorik" <matt@thebiz.net> To: <alpha@freebsd.org> Subject: HELP! Message-ID: <00c501bfa955$203546e0$1401eed8@mahatma>
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I have a reliable kernel panic when copying a file.
These are diskless servers. /etc is a MFS filesystem. /sandbox/etc is NFS
mounted.
[shell1]:DING~:~# cd /sandbox/etc
[shell1]:12:00pm:/sandobx/etc# cp /etc/sshd_config .
fatal kernel trap:
trap entry = 0x2 (memory management fault)
a0 = 0x0
a1 = 0x1
a2 = 0xffffffffffffffff
pc = 0x0
ra = 0x1
curproc = 0xfffffe0011456e00
pid = 338, comm = cp
ddbprinttrap from 0x0
ddbprinttrap(0x0, 0x1, 0xffffffffffffffff, 0x2)
panic: trap
panic
Stopped at Debugger+0x2c: ldq ra,0(sp) <0xfffffe0012afd3f0>\
<ra=0xfffffc00004abcc0,sp=0xfffffe0012afd3f0>
db> trace
Debugger() at Debugger+0x2c
panic() at panic+0x100
trap() at trap+0x610
XentMM() at XentMM+0x20
(null) at 0x1
db>
You can cat/more, ls -l, and otherwise manipulate the file. You can't copy
it for the life of me. (I haven't tried mv'ing it)
I tried different destinations, like cp /etc/sshd_config /tmp and that
still crashes.
This was a 4.0-RELEASE kernel. I CVS'd out the current kernel (cd /usr/src,
cvs co sys) just a couple of moments ago and tried that - no change, so it's
not a bug that has a fix recently committed.
These machines were really close to hitting production with FreeBSD instead
of Linux on them, but I can't have people rebooting the machines at will (:
Any pointers would be appreciated so I can fix this quickly.
There's no PC, or any other address that points to the bad code, so I really
can't track it down. Something is getting a null pointer, and crashing.
Since it's bringing down the machine, I assume it is in the kernel space. (I
assume a null pointer access in user space can't bring the machine down) My
gut tells me it's MFS related.
I can't reproduce this on my Intel boxes - either the bug doesn't exist or
the setup isn't identical.
- Matt
--
Matthew Zahorik Director of Systems and Networking - BiznessOnline.com
matt@thebiz.net President of AlbanyNet Inc. - a BiznessOnline subsidiary
maz@albany.net Voice: (518) 292-1001 Fax: (518) 626-0793
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