kernel crash dump could not be obtained

From: kamal kc (kamal_ckk_at_yahoo.com)
Date: 10/31/05

  • Next message: Rob: "Re: libXcursor.so.1.0.2 reference in libX11.so.6 ??" 
    Date: Mon, 31 Oct 2005 02:58:50 -0800 (PST)
To: freebsd-questions@freebsd.org

    dear all,

    i have to make modifictions to the kernel and
    i have been encountering kernel crashes all the
    time.

    the kernel panics with messages starting with
    vm_fault: and then crashes and reboots.

    i guess i have done incorrect memory operations and
    i want to know where i went wrong.

    so i thought of obtaining the crash dump. i went
    through the developers guide.
    and i added the following lines on the /etc/rc.conf 

    ---
dumpdev="/dev/ad0s1b"
dumpdir="/var/crash"
savecore_flags=""
--
the /etc/fstab file is
Device		Mountpoint	FStype	Options		Dump	Pass#
/dev/ad0s1b		none		swap	sw		0	0
/dev/ad0s1a		/		ufs	rw		1	1
/dev/ad0s1e		/tmp		ufs	rw		2	2
/dev/ad0s1f		/usr		ufs	rw		2	2
/dev/ad0s1d		/var		ufs	rw		2	2
/dev/acd0		/cdrom		cd9660	ro,noauto	0	0
swap partition is /dev/ad0s1b
swapinfo gives the output:--
Device          1K-blocks     Used    Avail Capacity
/dev/ad0s1b        495048        0   495048     0%
My memory size according to dmesg is --
real memory  = 266600448 (254 MB)
avail memory = 251232256 (239 MB)
--
Now when the kernel crashes it prints the message 
writing dump 240MB
but rebooting does not show any crash dump file 
on /var/crash.
please help
kamal
		
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  • Next message: Rob: "Re: libXcursor.so.1.0.2 reference in libX11.so.6 ??"