Hi , kdump need 2 kernel primary and secondary. Primary will be panicked, then secondary will do capture coredump.
In boot loader/ kernel command line specify crashkernel=256MB or more, ensure secondary kernel is small in size so that it can be boot within this memory, oom should not happen. Primary config: CONFIG_SYSFS=y CONFIG_KEXEC=y CONFIG_DEBUG_INFO=y Secondary Config: CONFIG_PHYSICAL_START=0x100000 CONFIG_RELOCATABLE=y CONFIG_CRASH_DUMP=y load secondary kernel using kexec -p <> After kernel panic, secondary kernel will be invoked. The secondary kernel should save core from /proc/vmcore and reboot again. Refer kdump kernel docs : https://www.kernel.org/doc/Documentation/kdump/kdump.txt Thanks, Satya On Fri, May 15, 2020 at 11:17 PM 慕冬亮 <[email protected]> wrote: > > > On May 15, 2020, at 12:47 PM, Subhashini Rao Beerisetty < > [email protected]> wrote: > > Hi all, > > In Kernel, what needs to be configured to get the crash dump? > Can someone clarify me with the sequence of steps to get the crash dump.. > > > Some materials for specific Linux distributions(e.g., Redhat, Debian): > > https://mudongliang.github.io/2018/07/02/debian-enable-kernel-dump.html > > > https://www.bentasker.co.uk/documentation/linux/312-installing-and-configuring-kdump-on-debian-jessie > > > https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/kernel_administration_guide/kernel_crash_dump_guide > > https://fedoraproject.org/wiki/How_to_use_kdump_to_debug_kernel_crashes > > > > Thanks, > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > > > _______________________________________________ > Kernelnewbies mailing list > [email protected] > https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies >
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