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zdev/dracut: fix kdump by only activating required devices

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This prevents out-of-memory (OOM) situations in the kdump crashkernel
environment.

Please note that the new dracut module 95zdev-kdump and the new library
zdev-lib.sh need to be packaged into the same (core) (sub)package as
95zdev.

This patch introduces a new dracut module "zdev-kdump", which is used
instead of module "zdev" when building a kdump initrd:

1. Ignore all persistently configured block devices and disable zfcp auto
LUN scanning => minimize the number of SCSI devices enabled during kdump.

2. Do not rely on chzdev's persistent configuration => work with systems
that do not use chzdev for persistent device configuration.

The detection of kdump is based on strict hostonly mode and on $IN_KDUMP.
See also
https://src.fedoraproject.org/rpms/kexec-tools commit
4eedcae5e154 ("dracut-module-setup.sh: don't include multipath-hostonly")
and https://github.com/dracutdevs/dracut commits
35e86ac117ac ("Merge 90-multipath-hostonly and 90-multipath")
a695250ec7db ("Introduce tri-state hostonly mode")
and
https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/mkdumprd#_17
https://src.fedoraproject.org/rpms/kexec-tools/blob/rawhide/f/dracut-module-setup.sh#_23.
The detection of kdump is also based on kdump_needed() in
https://github.com/openSUSE/kdump/blob/master/dracut/module-setup.sh.

Reviewed-by: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Steffen Maier
2023-01-19 19:09:04 +01:00
committed by Jan Höppner
parent f2c82bf2b5
commit 73c46a3056
4 changed files with 134 additions and 0 deletions
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zdev/dracut/Makefile
+5
View File
@@ -2,6 +2,7 @@
include ../../common.mak
ZDEVDIR := 95zdev
ZDEVKDUMPDIR := 95zdev-kdump
# HAVE_DRACUT
#
@@ -19,5 +20,9 @@ install:
$(INSTALL) -m 755 -d $(DESTDIR)$(DRACUTMODDIR)/$(ZDEVDIR)
$(INSTALL) -m 755 $(ZDEVDIR)/module-setup.sh \
$(ZDEVDIR)/parse-zdev.sh \
$(ZDEVDIR)/zdev-lib.sh \
$(DESTDIR)$(DRACUTMODDIR)/$(ZDEVDIR)/
$(INSTALL) -m 755 -d $(DESTDIR)$(DRACUTMODDIR)/$(ZDEVKDUMPDIR)
$(INSTALL) -m 755 $(ZDEVKDUMPDIR)/module-setup.sh \
$(DESTDIR)$(DRACUTMODDIR)/$(ZDEVKDUMPDIR)/
endif