Previously journalctl logs are directly dropped to save memory, but this make journalctl unusable in kdump kernel and diffcult to debug. So instead just don't let it read kmsg but keep other logs stored as volatile. Kernel message are already stored in the kernel log ring buffer, no need to let journalctl make a copy, especially when in kdump kernel, ususlly there won't be too much kernel log overlapping the old ring buffer. Signed-off-by: Kairui Song <kasong(a)redhat.com&gt; --- dracut-module-setup.sh | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index b0b30af..42bef7a 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -799,13 +799,14 @@ kdump_install_systemd_conf() { echo "DefaultTimeoutStartSec=300s" >> ${initdir}/etc/systemd/system.conf.d/kdump.conf fi - # Forward logs to console directly, this avoids unneccessary memory - # consumption and make console output more useful. + # Forward logs to console directly, and don't read Kmesg this + # avoids unneccessary memory consumption and make console output more useful. # Only do so for non fadump image. - if ! is_fadump_capable && [ "$failure_action" != "shell" ]; then + if ! is_fadump_capable; then mkdir -p ${initdir}/etc/systemd/journald.conf.d echo "[Journal]" > ${initdir}/etc/systemd/journald.conf.d/kdump.conf - echo "Storage=none" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf + echo "Storage=volatile" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf + echo "ReadKMsg=no" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf echo "ForwardToConsole=yes" >> ${initdir}/etc/systemd/journald.conf.d/kdump.conf fi } -- 2.28.0