Arch Linux

Sanjeev K Sharma

Member

Registered: 2013-08-14

Posts: 72

kdump is starting up but no vmcore

I finally got the kernel exec-ing after a panic

(the 192 was from a fedora page that said 192 should be enough for systems with 1Terabyte of physical RAM)

I have now tried these combinations
crashkernel (M)     cpu parameter
192                      nr_cpus
256                      nr_cpus
256                      maxcpus
512                      maxcpus(cat /sys/devices/system/cpu/online = 0-7)
512                       nr_cpus(cat /sys/devices/system/cpu/online = 0-7)

BUT I just realized: it looks like the parameters to kexec are not making it through - for the dump capture kernel

I have used the double quote syntax after the append= and without the double quotes

cat /proc/cmdline
root=/dev/sda3 elfcorehdr=900468k

adding the double quotes back in, with nr_cpus=1, the new kernel will not boot
adding the double quotes back in, with maxcpus=1, the new kernel will not boot

basically, with the quotes the kernel doesn't boot, after removing the quotes like here:

https://bbs.archlinux.org/viewtopic.php … 9#p1424049

the new kernel boots but I get no vmcore

what else can I try?

This is on a core i7, no virtualization, booting off a usb at the moment

Last edited by Sanjeev K Sharma (2015-04-07 06:51:36)