Date: Wed, 18 Nov 1998 11:38:05 +0100 From: Harold Gutch <logix@foobar.franken.de> To: freebsd-current@FreeBSD.ORG Subject: page fault when rm'ing on ccd-partition Message-ID: <19981118113805.A5521@foobar.franken.de>
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Hi,
I'm experiencing problems on a (non-local) 3.0-19980916-SNAP
non-SMP System. When rm'ing certain files from a ccd'd disk the
machine panics. I can't really localize the problem any further
as:
- I don't know which files exactly cause the problem, or what
they have in common,
find -mtime 7 | xargs rm
over one of the ccd-partitions reproducebly panics the machine
though.
- A person local to the machine wrote down the following
panic-output:
Fatal Trap 12: page fault while in kernel mode
fault virtual address = 0x0
fault code = supervisor read, page not present
instruction pointer = 0x8:0xf01152c7
stack pointer = 0x10:0xf0211f7c
frame pointer = 0x10:0xf0211f94
code segment = base 0x0, limit 0xfffff, type 0x1b
= DPL0, pres 1, def32 1, gran 1
processor flags = interrupt enabled, resume, IOPL=0
current process = Idle
interrupt mask = cam
trap number = 12
panic: page fault
$ nm -aout /kernel | grep f01152
f0115288 t _ahc_handle_target_cmd
from /etc/ccd.conf:
ccd1 65536 0 /dev/sd4g /dev/sd5g /dev/sd6g /dev/sd7g
So if it's the SCSI-driver which causes the panics, trying to
dump to a SCSI-disk isn't very likely to succeed :).
- The kernel even refuses to dump to a newly plugged in IDE-disk,
a partition of which is configured as swap- and dumpdevice, but
after booting the output "savecore: no core dump" can be seen.
As the machine is about an hour's ride away from me, I'd rather
be able to debug the problem remotely.
I asked for a serial cable to a linux-box standing next to the
FreeBSD-machine, I guess I then could use it as console, get it to
fall to ddb when panicing and then get a stacktrace - or am I
missing something that wouldn't work ?
If i got the kernel do dump to the IDE-disk, that too would of
course help... any ideas why this is failing ?
--
bye, logix
<Shabby> Sleep is an abstinence syndrome wich occurs due to lack of caffein.
ed Mar 4 04:53:33 CET 1998 #unix, ircnet
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