I wanted to know what is the best way to generate the kernel crash dump on kernel panic,
after doing some searching, i came to know we can use kexec to load a new kernel on the kernel,
i followed the instruction from the following links
I do found that the kernel load properly with the, kexec -l option followed by kexec -e option,
but when i set the kernel to be loaded on kernel panic using the option kexec -p, i see that after
kernel crash, the system just hangs, it wont even try to load the new kernel. following are the
commands am using. Can some one point, if there is any thing wrong with this.
chkconfig kdump on
/etc/init.d/kdump start
kexec -l --append="`cat /proc/cmdline`" --initrd=/boot/initrd.img-2.6.35.10-kdump /boot/vmlinuz-2.6.35.10-kdump
kexec -e
works fine and loads the kernel successfully, i will be able to see starting new kernel in the shell
chkconfig kdump on
/etc/init.d/kdump start
kexec -p --append="`cat /proc/cmdline`" --initrd=/boot/initrd.img-2.6.35.10
-kdump
/boot/vmlinuz-2.6.35.10
-kdump
i simulate the panic by using
echo 1 > /proc/sys/kernel/sysrq
echo c > /proc/sysrq-trigger
which just crash the kernel and system hangs, and it does not show any message starting new kernel.
Thanks,
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