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The systemd pstore service archives the contents of /sys/fs/pstore upon boot so that there is room for a subsequent dump. The issue is that while the service is present, the kernel still needs to be configured to write data into the pstore. The kernel has two parameters, crash_kexec_post_notifiers and printk.always_kmsg_dump, that control writes into pstore. The crash_kexec_post_notifiers parameter enables the kernel to write dmesg (including stack trace) into pstore upon a panic, and printk.always_kmsg_dump parameter enables the kernel to write dmesg upon a shutdown (shutdown, reboot, halt). As it stands today, these parameters are not managed/manipulated by the systemd pstore service, and are solely reliant upon the user [to have the foresight] to set them on the kernel command line at boot, or post boot via sysfs. Furthermore, the user would need to set these parameters in a persistent fashion so that that they are enabled on subsequent reboots. This patch introduces the setting of these two kernel parameters via the systemd tmpfiles technique.
System and Service Manager
Details
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