In Linux, there are two kinds of crashes - kernel panic/oom and user space core dump. For kernel panic, the standard config is rebooting the system. Unfortunately, the panic log can only be printed to console and will disappear after reboot if there is no additional device to record the console log - most kernel panic/oom logs won’t be written to system log, and even they do, there is no way to sync them to disk storage during panic.
As for user-sapce core dump, core files will be generated to /tmp/pid.core(core pattern can be changed in /proc/sys/kernel/core_pattern) by default. It is up to the admin to decide if the system or process needs reboot after core dump. Although a script can be used to record more logs for the coredump, sometimes it’s still useful to retain some info in the persistent memory, like the backtrace of the coredumped process.
- See more at: http://www.bo-yang.net/2015/05/27/retrieve-last-log/#sthash.jiD8jrf5.dpuf
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