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Message #43959
[Bug 785394] Re: Hard-coded crashkernel=... memory reservation in /etc/grub.d/10_linux is insufficient
128MB didn't work
256MB did
Nothing else was tested on this machine.
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https://bugs.launchpad.net/bugs/785394
Title:
Hard-coded crashkernel=... memory reservation in /etc/grub.d/10_linux
is insufficient
Status in “grub” package in Ubuntu:
Fix Released
Status in “kexec-tools” package in Ubuntu:
Fix Released
Status in “grub” source package in Precise:
In Progress
Status in “grub” source package in Quantal:
In Progress
Status in “grub” source package in Raring:
In Progress
Status in “grub” source package in Saucy:
In Progress
Bug description:
Binary package hint: grub-pc
This concerns grub-pc 1.99~rc1-13ubuntu3 in Ubuntu Natty.
The /etc/grub.d/10_linux file contains this snippet:
# add crashkernel option if we have the required tools
if [ -x "/usr/bin/makedumpfile" ] && [ -x "/sbin/kexec" ]; then
GRUB_CMDLINE_EXTRA="$GRUB_CMDLINE_EXTRA crashkernel=384M-2G:64M,2G-:128M"
fi
I am on a system with 2GB of RAM (reported as 2038MB), and according
to the kernel startup messages, 64MB is reserved for the crash kernel.
Unfortunately, this does not appear to be enough memory for the
regular Ubuntu kernel to boot. I am attaching a kernel log obtained
via serial cable; it shows the initial boot, a crash in the kernel's
video-driver-related code, the subsequent crashkernel boot, and then
an apparent "out of memory" kernel panic. (A side effect of the
"double crash" is that the system is left unresponsive, requiring a
manual reset instead of rebooting itself automatically.)
If I double the memory numbers in the crashkernel=... argument, so
that the reservation is 128MB, the system correctly goes on to attempt
a vmcore dump and reboot.
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