Date: Sat, 4 Dec 1999 21:14:50 -0500 (EST) From: "Mark W. Krentel" <krentel@dreamscape.com> To: freebsd-emulation@FreeBSD.ORG Subject: Re: running linux binaries from ext2fs partition Message-ID: <199912050214.VAA04654@dreamscape.com>
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A couple days ago, I reported getting panics when I tried running
linux programs from their ext2fs partition.
> My machine dual boots between Freebsd 3.3-stable (as of Nov 7) and Red
> Hat 6.0. I have the linux_base-6.0 port installed and the linux.ko
> module installed. I can run linux's ls by copying it onto a freebsd
> partition, but it panicked on ext2fs.
I've been trying to investigate this further, but unfortunately, I've
been unable to get a kernel dump (see below). I've produced several
panics, but when it crashes, I don't get the usual "Auto reboot in 15
seconds" message. Instead, I get several panic messages which fly off
the console. Then it freezes and I can only read the last message.
The instruction pointers are mostly very low, 0x8:350, or very high,
0x8:c45b1153 (with a stack pointer 0x10:0xc45b1234). I'm guessing
that it panics, tries to dump core and panics again with a less useful
message.
One time it panicked just once, printed just one message and gave the
the "Auto reboot in 15 seconds" message. This was my first test,
before I had dumpon turned on. It had a more useful instruction
pointer: 0x8:0xc01f1916. Looking through the kernel name list:
% nm kernel | sort
c0116c40 T btext
c0116c96 t begin
...
c01f1850 T generic_bzero
c01f186c T i686_pagezero
c01f18ac T fillw
c01f18c0 T bcopyb
c01f18ec T bcopy
c01f18f4 T ovbcopy
c01f18fc T generic_bcopy
c01f1944 T memcpy
c01f1968 T copyout
c01f1970 T generic_copyout
c01f19ae t done_copyout
c01f19c0 t copyout_fault
c01f19dc T copyin
c01f19e4 T generic_copyin
c01f1a30 t copyin_fault
...
c02527ec B vga_sub_configure
c02527f0 B swbuf
c02527f4 A _end
c02527f4 A end
So, maybe generic_bcopy? I'm sorry I don't have more to report.
Anything else I should try?
Now, on to why I can't get a kernel dump. I have dumpon turned on
in /etc/rc.conf.local:
dumpdev="/dev/da0b"
And sysctl reports that it is turned on:
% sysctl -a | grep -i dump
kern.dumpdev: { major = 4, minor = 1 }
kern.sugid_coredump: 0
machdep.do_dump: 1
Memory is 64 Meg, swap is 160 Meg, minfree is 2048. /var has 75 Meg
free, so that should be enough. The swap partition, /dev/da0s2b, is
also used as MFS for /tmp.
But I'm not getting a kernel dump. On reboot, savecore just reports
"no crash dump." When it panics, the disk and scsi controller are
quiet, so it must not be writing out the dump.
Am I missing a step? Or is the panic so bad that it can't dump core?
Any suggestions on how to get a dump, or what to try without one?
P.S. I didn't understand this comment in the man page for dumpon under
BUGS: "Dumpon currently allows only devices with minor number 1 to be
used as dump devices." In /dev:
brw-r----- 1 root operator 4, 1 Nov 7 19:14 /dev/da0b
brw-r----- 1 root operator 4, 0x00030001 Jul 1 18:51 /dev/da0s2b
Does it matter if I set dumpdev to /dev/da0b or /dev/da0s2b? Is minor
number 0x00030001 close enough to 1 for dumps? I tried both and
neither worked.
--Mark Krentel
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