Certain kernel parameters like min_free_kbytes can be configured at runtime using sysctl. While this is useful in first kernel, it can lead to unnecessary failures like OOM in kdump kernel. This patch enforces default vaules for all sysctl parameters, in kdump kernel, by removing sysctl.conf & sysctl.d/* files.

Signed-off-by: Hari Bathini <hbathini(a)linux.vnet.ibm.com&gt; --- dracut-module-setup.sh | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index dcebc47..e648f91 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -378,6 +378,18 @@ kdump_install_conf() { rm -f /tmp/$$-kdump.conf } +# Default sysctl parameters should suffice for kdump kernel. +# Remove custom configurations sysctl.conf & sysctl.d/* +remove_sysctl_conf() { + + # As custom configurations like vm.min_free_kbytes can lead + # to OOM issues in kdump kernel, avoid them + rm -f "${initdir}/etc/sysctl.conf" + rm -rf "${initdir}/etc/sysctl.d" + rm -rf "${initdir}/run/sysctl.d" + rm -rf "${initdir}/usr/lib/sysctl.d" +} + kdump_iscsi_get_rec_val() { local result @@ -586,6 +598,7 @@ kdump_install_random_seed() { install() { kdump_install_conf + remove_sysctl_conf if is_ssh_dump_target; then kdump_install_random_seed

Certain kernel parameters like min_free_kbytes can be configured at runtime using sysctl. While this is useful in first kernel, it can lead to unnecessary failures like OOM in kdump kernel. This patch enforces default vaules for all sysctl parameters, in kdump kernel, by removing sysctl.conf & sysctl.d/* files. Signed-off-by: Hari Bathini <hbathini(a)linux.vnet.ibm.com&gt; --- dracut-module-setup.sh | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/dracut-module-setup.sh b/dracut-module-setup.sh index dcebc47..e648f91 100755 --- a/dracut-module-setup.sh +++ b/dracut-module-setup.sh @@ -378,6 +378,18 @@ kdump_install_conf() { rm -f /tmp/$$-kdump.conf } +# Default sysctl parameters should suffice for kdump kernel. +# Remove custom configurations sysctl.conf & sysctl.d/* +remove_sysctl_conf() { + + # As custom configurations like vm.min_free_kbytes can lead + # to OOM issues in kdump kernel, avoid them + rm -f "${initdir}/etc/sysctl.conf" + rm -rf "${initdir}/etc/sysctl.d" + rm -rf "${initdir}/run/sysctl.d" + rm -rf "${initdir}/usr/lib/sysctl.d" +} + kdump_iscsi_get_rec_val() { local result @@ -586,6 +598,7 @@ kdump_install_random_seed() { install() { kdump_install_conf + remove_sysctl_conf if is_ssh_dump_target; then kdump_install_random_seed