kexec June 2022

kexec@lists.fedoraproject.org

20 participants
23 discussions

[PATCH v3] kdump-lib: use non-debug kernels first
by Lichen Liu 13 Jun '22

13 Jun '22

Kdump uses currently running kernel as default, but when currently running kernel is a debug kernel, it will consume more memory, which may cause out-of-memory and fail to collect vmcore. Now we will try to use non-debug kernels first if possible. Also extract the logic of determine KDUMP_KERNEL from prepare_kdump_bootinfo into a function. This function will return KDUMP_KERNEL given a kernel version. Signed-off-by: Lichen Liu <lichliu(a)redhat.com> --- Update: v1 -> v2: - extract the logic of determine KDUMP_KERNEL from prepare_kdump_bootinfo into a function. v2 -> v3: - remove an extra space. - remove 2 unused variable declarations. - warn when using debug kernel. kdump-lib.sh | 67 ++++++++++++++++++++++++++++++++++++++-------------- 1 file changed, 49 insertions(+), 18 deletions(-) diff --git a/kdump-lib.sh b/kdump-lib.sh index b137c89..07f5012 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -633,46 +633,77 @@ prepare_kexec_args() echo "$kexec_args" } -# -# Detect initrd and kernel location, results are stored in global enviromental variables: -# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD -# -# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already -# and will prefer already set values so user can specify custom kernel/initramfs location -# -prepare_kdump_bootinfo() +# prepare_kdump_kernel <kdump_kernelver> +# This function return kdump_kernel given a kernel version. +prepare_kdump_kernel() { - local boot_img boot_imglist boot_dirlist boot_initrdlist - local machine_id dir img default_initrd_base var_target_initrd_dir - - if [[ -z $KDUMP_KERNELVER ]]; then - KDUMP_KERNELVER="$(uname -r)" - fi - + local kdump_kernelver=$1 + local boot_dirlist boot_imglist kdump_kernel machine_id read -r machine_id < /etc/machine-id + boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"} - boot_imglist="$KDUMP_IMG-$KDUMP_KERNELVER$KDUMP_IMG_EXT $machine_id/$KDUMP_KERNELVER/$KDUMP_IMG" + boot_imglist="$KDUMP_IMG-$kdump_kernelver$KDUMP_IMG_EXT $machine_id/$kdump_kernelver/$KDUMP_IMG" # Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format boot_img="$(sed "s/^BOOT_IMAGE=$(\S*)$\?$\S*$ .*/\2/" /proc/cmdline)" - if [[ -n $boot_img ]]; then + if [[ "$boot_img" == *"$kdump_kernelver" ]]; then boot_imglist="$boot_img $boot_imglist" fi for dir in $boot_dirlist; do for img in $boot_imglist; do if [[ -f "$dir/$img" ]]; then - KDUMP_KERNEL=$(echo "$dir/$img" | tr -s '/') + kdump_kernel=$(echo "$dir/$img" | tr -s '/') break 2 fi done done + echo "$kdump_kernel" +} + +# +# Detect initrd and kernel location, results are stored in global environmental variables: +# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD +# +# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already +# and will prefer already set values so user can specify custom kernel/initramfs location +# +prepare_kdump_bootinfo() +{ + local boot_initrdlist nondebug_kernelver debug_kernelver + local default_initrd_base var_target_initrd_dir + + if [[ -z $KDUMP_KERNELVER ]]; then + KDUMP_KERNELVER="$(uname -r)" + nondebug_kernelver=$(sed -n -e 's/$.*$+debug$/\1/p' <<< "$KDUMP_KERNELVER") + fi + + # Use nondebug kernel if possible, because debug kernel will consume more memory and may oom. + if [[ -n $nondebug_kernelver ]]; then + dinfo "Trying to use $nondebug_kernelver." + debug_kernelver="$KDUMP_KERNELVER" + KDUMP_KERNELVER="$nondebug_kernelver" + fi + + KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER") + + if ! [[ -e $KDUMP_KERNEL ]]; then + if [[ -n $debug_kernelver ]]; then + dinfo "Fallback to using debug kernel" + KDUMP_KERNELVER="$debug_kernelver" + KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER") + fi + fi if ! [[ -e $KDUMP_KERNEL ]]; then derror "Failed to detect kdump kernel location" return 1 fi + if [[ "$KDUMP_KERNEL" == *"+debug" ]]; then + dwarn "Using debug kernel, you may need to set a larger crashkernel than the default value." + fi + # Set KDUMP_BOOTDIR to where kernel image is stored KDUMP_BOOTDIR=$(dirname "$KDUMP_KERNEL") -- 2.31.1

2 2

Solar battery maker
by Tiffany 11 Jun '22

11 Jun '22

1 0

CBD inquiry
by tommy＠tgybio.com 10 Jun '22

10 Jun '22

1 0

[PATCH] crashkernel: optimize arm64 reserved size if PAGE_SIZE=4k
by Pingfan Liu 09 Jun '22

09 Jun '22

The arm64 platform supports either 64KB or 4KB page size. In the case of 4KB page size, the reserved memory size can be aligned to that on x86_64. Introducing a new formula for 4KB on arm64, which bases on x86_64 plus extra 64MB. Signed-off-by: Pingfan Liu <piliu(a)redhat.com> --- gitlab: https://gitlab.com/coxu/fedora-kexec-tools/-/merge_requests/8 kdump-lib.sh | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/kdump-lib.sh b/kdump-lib.sh index b137c89..ef9bd64 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -853,7 +853,13 @@ kdump_get_arch_recommend_crashkernel() if [[ $_arch == "x86_64" ]] || [[ $_arch == "s390x" ]]; then _ck_cmdline="1G-4G:192M,4G-64G:256M,64G-:512M" elif [[ $_arch == "aarch64" ]]; then - _ck_cmdline="2G-:448M" + # 64K page + if [[ $(getconf PAGE_SIZE) -eq 65536 ]]; then + _ck_cmdline="2G-:448M" + else + # based on x86 plus extra = 64M + _ck_cmdline="1G-4G:256M,4G-64G:320M,64G-:576M" + fi elif [[ $_arch == "ppc64le" ]]; then if [[ $_dump_mode == "fadump" ]]; then _ck_cmdline="4G-16G:768M,16G-64G:1G,64G-128G:2G,128G-1T:4G,1T-2T:6G,2T-4T:12G,4T-8T:20G,8T-16T:36G,16T-32T:64G,32T-64T:128G,64T-:180G" -- 2.31.1

5 11

[PATCH v2] sysconfig: use a simple generator script to maintain
by Kairui Song 08 Jun '22

08 Jun '22

From: Kairui Song <kasong(a)tencent.com> These kdump.sysconfig.* files are almost identical with a bit different in several parameters, just use a simple script to generate them upon packaging. This should make it easier to maintain, updating a comment or param for certain arch can be done in one place. There are some minor differences with the generated version due to some arch's sysconfig is not up-to-dated, this actually fixed the issue, to check these differences: # for arch in aarch64 i386 ppc64 ppc64le s390x x86_64; do ./gen-kdump-sysconfig.sh $arch > kdump.sysconfig.$arch.new git checkout HEAD^ kdump.sysconfig.$arch &>/dev/null echo "Diff of arch $arch:" diff kdump.sysconfig.$arch kdump.sysconfig.$arch.new; echo "" done; git reset; Diff of arch aarch64: > #What is the images extension. Relocatable kernels don't have one > KDUMP_IMG_EXT="" Diff of arch i386: Diff of arch ppc64: 42,43d41 < #Specify the action after failure < Diff of arch ppc64le: 42,43d41 < #Specify the action after failure < Diff of arch s390x: 26,28d25 < # Any additional /sbin/mkdumprd arguments required. < MKDUMPRD_ARGS="" < Diff of arch x86_64: Signed-off-by: Kairui Song <kasong(a)tencent.com> --- Update from V1: - Use a here doc to include the template inline the script. - Print a warning for unknown arch. Thanks to Philipp for these suggestion. kdump.sysconfig => gen-kdump-sysconfig.sh | 59 +++++++++++++++++++++++ kdump.sysconfig.aarch64 | 53 -------------------- kdump.sysconfig.i386 | 56 --------------------- kdump.sysconfig.ppc64 | 58 ---------------------- kdump.sysconfig.ppc64le | 58 ---------------------- kdump.sysconfig.s390x | 59 ----------------------- kdump.sysconfig.x86_64 | 56 --------------------- kexec-tools.spec | 17 ++----- 8 files changed, 64 insertions(+), 352 deletions(-) rename kdump.sysconfig => gen-kdump-sysconfig.sh (50%) mode change 100644 => 100755 delete mode 100644 kdump.sysconfig.aarch64 delete mode 100644 kdump.sysconfig.i386 delete mode 100644 kdump.sysconfig.ppc64 delete mode 100644 kdump.sysconfig.ppc64le delete mode 100644 kdump.sysconfig.s390x delete mode 100644 kdump.sysconfig.x86_64 diff --git a/kdump.sysconfig b/gen-kdump-sysconfig.sh old mode 100644 new mode 100755 similarity index 50% rename from kdump.sysconfig rename to gen-kdump-sysconfig.sh index 70ebf04..0fbf0ae --- a/kdump.sysconfig +++ b/gen-kdump-sysconfig.sh @@ -1,3 +1,10 @@ +#!/bin/bash +# $1: target arch + +SED_EXP="" + +generate() { +sed "$SED_EXP" <<EOF # Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump # If no version is specified, then the init script will try to find a # kdump kernel with the same version number as the running kernel. @@ -36,6 +43,9 @@ KEXEC_ARGS="" #What is the image type used for kdump KDUMP_IMG="vmlinuz" +#What is the images extension. Relocatable kernels don't have one +KDUMP_IMG_EXT="" + # Logging is controlled by following variables in the first kernel: # - @var KDUMP_STDLOGLVL - logging level to standard error (console output) # - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) @@ -51,3 +61,52 @@ KDUMP_IMG="vmlinuz" # KDUMP_STDLOGLVL=3 # KDUMP_SYSLOGLVL=0 # KDUMP_KMSGLOGLVL=0 +EOF +} + +update_param() +{ + SED_EXP="${SED_EXP}s/^$1=.*$/$1=\"$2\"/;" +} + +case "$1" in +aarch64) + update_param KEXEC_ARGS "-s" + update_param KDUMP_COMMANDLINE_APPEND \ + "irqpoll nr_cpus=1 reset_devices cgroup_disable=memory udev.children-max=2 panic=10 swiotlb=noforce novmcoredd cma=0 hugetlb_cma=0" + ;; +i386) + update_param KDUMP_COMMANDLINE_APPEND \ + "irqpoll nr_cpus=1 reset_devices numa=off udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd cma=0 hugetlb_cma=0" + ;; +ppc64) + update_param KEXEC_ARGS "--dt-no-old-root" + update_param KDUMP_COMMANDLINE_REMOVE \ + "hugepages hugepagesz slub_debug quiet log_buf_len swiotlb hugetlb_cma" + update_param KDUMP_COMMANDLINE_APPEND \ + "irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd hugetlb_cma=0" + ;; +ppc64le) + update_param KEXEC_ARGS "--dt-no-old-root -s" + update_param KDUMP_COMMANDLINE_REMOVE \ + "hugepages hugepagesz slub_debug quiet log_buf_len swiotlb hugetlb_cma" + update_param KDUMP_COMMANDLINE_APPEND \ + "irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd hugetlb_cma=0" + ;; +s390x) + update_param KEXEC_ARGS "-s" + update_param KDUMP_COMMANDLINE_REMOVE \ + "hugepages hugepagesz slub_debug quiet log_buf_len swiotlb vmcp_cma cma hugetlb_cma prot_virt" + update_param KDUMP_COMMANDLINE_APPEND \ + "nr_cpus=1 cgroup_disable=memory numa=off udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd vmcp_cma=0 cma=0 hugetlb_cma=0" + ;; +x86_64) + update_param KEXEC_ARGS "-s" + update_param KDUMP_COMMANDLINE_APPEND \ + "irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off numa=off udev.children-max=2 panic=10 acpi_no_memhotplug transparent_hugepage=never nokaslr hest_disable novmcoredd cma=0 hugetlb_cma=0" + ;; +*) + echo "Warning: Unknown architecture '$1', using default sysconfig template." +esac + +generate diff --git a/kdump.sysconfig.aarch64 b/kdump.sysconfig.aarch64 deleted file mode 100644 index 67a2af7..0000000 --- a/kdump.sysconfig.aarch64 +++ /dev/null @@ -1,53 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb cma hugetlb_cma" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory udev.children-max=2 panic=10 swiotlb=noforce novmcoredd cma=0 hugetlb_cma=0" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="-s" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kdump.sysconfig.i386 b/kdump.sysconfig.i386 deleted file mode 100644 index 7e18c1c..0000000 --- a/kdump.sysconfig.i386 +++ /dev/null @@ -1,56 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb cma hugetlb_cma" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices numa=off udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd cma=0 hugetlb_cma=0" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -#What is the images extension. Relocatable kernels don't have one -KDUMP_IMG_EXT="" - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kdump.sysconfig.ppc64 b/kdump.sysconfig.ppc64 deleted file mode 100644 index ebb22f6..0000000 --- a/kdump.sysconfig.ppc64 +++ /dev/null @@ -1,58 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb hugetlb_cma" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd hugetlb_cma=0" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="--dt-no-old-root" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -#What is the images extension. Relocatable kernels don't have one -KDUMP_IMG_EXT="" - -#Specify the action after failure - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kdump.sysconfig.ppc64le b/kdump.sysconfig.ppc64le deleted file mode 100644 index 270a2cf..0000000 --- a/kdump.sysconfig.ppc64le +++ /dev/null @@ -1,58 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb hugetlb_cma" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="irqpoll maxcpus=1 noirqdistrib reset_devices cgroup_disable=memory numa=off udev.children-max=2 ehea.use_mcs=0 panic=10 kvm_cma_resv_ratio=0 transparent_hugepage=never novmcoredd hugetlb_cma=0" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="--dt-no-old-root -s" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -#What is the images extension. Relocatable kernels don't have one -KDUMP_IMG_EXT="" - -#Specify the action after failure - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kdump.sysconfig.s390x b/kdump.sysconfig.s390x deleted file mode 100644 index 234cfe9..0000000 --- a/kdump.sysconfig.s390x +++ /dev/null @@ -1,59 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb vmcp_cma cma hugetlb_cma prot_virt" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="nr_cpus=1 cgroup_disable=memory numa=off udev.children-max=2 panic=10 transparent_hugepage=never novmcoredd vmcp_cma=0 cma=0 hugetlb_cma=0" - -# Any additional /sbin/mkdumprd arguments required. -MKDUMPRD_ARGS="" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="-s" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -#What is the images extension. Relocatable kernels don't have one -KDUMP_IMG_EXT="" - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kdump.sysconfig.x86_64 b/kdump.sysconfig.x86_64 deleted file mode 100644 index 188ba3c..0000000 --- a/kdump.sysconfig.x86_64 +++ /dev/null @@ -1,56 +0,0 @@ -# Kernel Version string for the -kdump kernel, such as 2.6.13-1544.FC5kdump -# If no version is specified, then the init script will try to find a -# kdump kernel with the same version number as the running kernel. -KDUMP_KERNELVER="" - -# The kdump commandline is the command line that needs to be passed off to -# the kdump kernel. This will likely match the contents of the grub kernel -# line. For example: -# KDUMP_COMMANDLINE="ro root=LABEL=/" -# Dracut depends on proper root= options, so please make sure that appropriate -# root= options are copied from /proc/cmdline. In general it is best to append -# command line options using "KDUMP_COMMANDLINE_APPEND=". -# If a command line is not specified, the default will be taken from -# /proc/cmdline -KDUMP_COMMANDLINE="" - -# This variable lets us remove arguments from the current kdump commandline -# as taken from either KDUMP_COMMANDLINE above, or from /proc/cmdline -# NOTE: some arguments such as crashkernel will always be removed -KDUMP_COMMANDLINE_REMOVE="hugepages hugepagesz slub_debug quiet log_buf_len swiotlb cma hugetlb_cma" - -# This variable lets us append arguments to the current kdump commandline -# after processed by KDUMP_COMMANDLINE_REMOVE -KDUMP_COMMANDLINE_APPEND="irqpoll nr_cpus=1 reset_devices cgroup_disable=memory mce=off numa=off udev.children-max=2 panic=10 acpi_no_memhotplug transparent_hugepage=never nokaslr hest_disable novmcoredd cma=0 hugetlb_cma=0" - -# Any additional kexec arguments required. In most situations, this should -# be left empty -# -# Example: -# KEXEC_ARGS="--elf32-core-headers" -KEXEC_ARGS="-s" - -#Where to find the boot image -#KDUMP_BOOTDIR="/boot" - -#What is the image type used for kdump -KDUMP_IMG="vmlinuz" - -#What is the images extension. Relocatable kernels don't have one -KDUMP_IMG_EXT="" - -# Logging is controlled by following variables in the first kernel: -# - @var KDUMP_STDLOGLVL - logging level to standard error (console output) -# - @var KDUMP_SYSLOGLVL - logging level to syslog (by logger command) -# - @var KDUMP_KMSGLOGLVL - logging level to /dev/kmsg (only for boot-time) -# -# In the second kernel, kdump will use the rd.kdumploglvl option to set the -# log level in the above KDUMP_COMMANDLINE_APPEND. -# - @var rd.kdumploglvl - logging level to syslog (by logger command) -# - for example: add the rd.kdumploglvl=3 option to KDUMP_COMMANDLINE_APPEND -# -# Logging levels: no logging(0), error(1),warn(2),info(3),debug(4) -# -# KDUMP_STDLOGLVL=3 -# KDUMP_SYSLOGLVL=0 -# KDUMP_KMSGLOGLVL=0 diff --git a/kexec-tools.spec b/kexec-tools.spec index db6374c..a63bcda 100644 --- a/kexec-tools.spec +++ b/kexec-tools.spec @@ -11,10 +11,7 @@ Summary: The kexec/kdump userspace component Source0: http://kernel.org/pub/linux/utils/kernel/kexec/%{name}-%{version}.tar.xz Source1: kdumpctl -Source2: kdump.sysconfig -Source3: kdump.sysconfig.x86_64 -Source4: kdump.sysconfig.i386 -Source5: kdump.sysconfig.ppc64 +Source3: gen-kdump-sysconfig.sh Source7: mkdumprd Source8: kdump.conf Source9: https://github.com/makedumpfile/makedumpfile/archive/%{mkdf_ver}/makedumpfi… @@ -25,18 +22,15 @@ Source13: 98-kexec.rules Source14: 98-kexec.rules.ppc64 Source15: kdump.conf.5 Source16: kdump.service -Source18: kdump.sysconfig.s390x Source19: https://github.com/lucchouina/eppic/archive/%{eppic_ver}/eppic-%{eppic_shor… Source20: kdump-lib.sh Source21: kdump-in-cluster-environment.txt Source22: kdump-dep-generator.sh Source23: kdump-lib-initramfs.sh -Source24: kdump.sysconfig.ppc64le Source25: kdumpctl.8 Source26: live-image-kdump-howto.txt Source27: early-kdump-howto.txt Source28: kdump-udev-throttler -Source29: kdump.sysconfig.aarch64 Source30: 60-kdump.install Source31: kdump-logger.sh Source32: mkfadumprd @@ -152,6 +146,9 @@ cp %{SOURCE26} . cp %{SOURCE27} . cp %{SOURCE34} . +# Generate sysconfig file +%{SOURCE3} %{_target_cpu} > kdump.sysconfig + make %ifarch %{ix86} x86_64 ppc64 s390x ppc64le aarch64 make -C eppic-%{eppic_ver}/libeppic @@ -183,13 +180,9 @@ install -m 755 build/sbin/vmcore-dmesg $RPM_BUILD_ROOT/usr/sbin/vmcore-dmesg install -m 644 build/man/man8/kexec.8 $RPM_BUILD_ROOT%{_mandir}/man8/ install -m 644 build/man/man8/vmcore-dmesg.8 $RPM_BUILD_ROOT%{_mandir}/man8/ -SYSCONFIG=$RPM_SOURCE_DIR/kdump.sysconfig.%{_target_cpu} -[ -f $SYSCONFIG ] || SYSCONFIG=$RPM_SOURCE_DIR/kdump.sysconfig.%{_arch} -[ -f $SYSCONFIG ] || SYSCONFIG=$RPM_SOURCE_DIR/kdump.sysconfig -install -m 644 $SYSCONFIG $RPM_BUILD_ROOT%{_sysconfdir}/sysconfig/kdump - install -m 755 %{SOURCE7} $RPM_BUILD_ROOT/usr/sbin/mkdumprd install -m 644 %{SOURCE8} $RPM_BUILD_ROOT%{_sysconfdir}/kdump.conf +install -m 644 kdump.sysconfig $RPM_BUILD_ROOT%{_sysconfdir}/sysconfig/kdump install -m 644 kexec/kexec.8 $RPM_BUILD_ROOT%{_mandir}/man8/kexec.8 install -m 644 %{SOURCE12} $RPM_BUILD_ROOT%{_mandir}/man8/mkdumprd.8 install -m 644 %{SOURCE25} $RPM_BUILD_ROOT%{_mandir}/man8/kdumpctl.8 -- 2.35.2

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[PATCH v2] kdump-lib: use non-debug kernels first
by Lichen Liu 07 Jun '22

07 Jun '22

Kdump uses currently running kernel as default, but when currently running kernel is a debug kernel, it will consume more memory, which may cause out-of-memory and fail to collect vmcore. Now we will try to use non-debug kernels first if possible. Also extract the logic of determine KDUMP_KERNEL from prepare_kdump_bootinfo into a function. This function will return KDUMP_KERNEL given a kernel version. Signed-off-by: Lichen Liu <lichliu(a)redhat.com> --- Update from V1: - extract the logic of determine KDUMP_KERNEL from prepare_kdump_bootinfo into a function. kdump-lib.sh | 63 +++++++++++++++++++++++++++++++++++++--------------- 1 file changed, 45 insertions(+), 18 deletions(-) diff --git a/kdump-lib.sh b/kdump-lib.sh index b137c89..a39e5b1 100755 --- a/kdump-lib.sh +++ b/kdump-lib.sh @@ -633,40 +633,67 @@ prepare_kexec_args() echo "$kexec_args" } -# -# Detect initrd and kernel location, results are stored in global enviromental variables: -# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD -# -# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already -# and will prefer already set values so user can specify custom kernel/initramfs location -# -prepare_kdump_bootinfo() +# prepare_kdump_kernel <kdump_kernelver> +# This function return kdump_kernel given a kernel version. +prepare_kdump_kernel() { - local boot_img boot_imglist boot_dirlist boot_initrdlist - local machine_id dir img default_initrd_base var_target_initrd_dir - - if [[ -z $KDUMP_KERNELVER ]]; then - KDUMP_KERNELVER="$(uname -r)" - fi - + local kdump_kernelver=$1 + local boot_dirlist boot_imglist kdump_kernel machine_id read -r machine_id < /etc/machine-id + boot_dirlist=${KDUMP_BOOTDIR:-"/boot /boot/efi /efi /"} - boot_imglist="$KDUMP_IMG-$KDUMP_KERNELVER$KDUMP_IMG_EXT $machine_id/$KDUMP_KERNELVER/$KDUMP_IMG" + boot_imglist="$KDUMP_IMG-$kdump_kernelver$KDUMP_IMG_EXT $machine_id/$kdump_kernelver/$KDUMP_IMG" # Use BOOT_IMAGE as reference if possible, strip the GRUB root device prefix in (hd0,gpt1) format boot_img="$(sed "s/^BOOT_IMAGE=$(\S*)$\?$\S*$ .*/\2/" /proc/cmdline)" - if [[ -n $boot_img ]]; then + if [[ "$boot_img" == *"$kdump_kernelver" ]]; then boot_imglist="$boot_img $boot_imglist" fi for dir in $boot_dirlist; do for img in $boot_imglist; do if [[ -f "$dir/$img" ]]; then - KDUMP_KERNEL=$(echo "$dir/$img" | tr -s '/') + kdump_kernel=$(echo "$dir/$img" | tr -s '/') break 2 fi done done + echo "$kdump_kernel" +} + +# +# Detect initrd and kernel location, results are stored in global enviromental variables: +# KDUMP_BOOTDIR, KDUMP_KERNELVER, KDUMP_KERNEL, DEFAULT_INITRD, and KDUMP_INITRD +# +# Expectes KDUMP_BOOTDIR, KDUMP_IMG, KDUMP_IMG_EXT, KDUMP_KERNELVER to be loaded from config already +# and will prefer already set values so user can specify custom kernel/initramfs location +# +prepare_kdump_bootinfo() +{ + local boot_initrdlist nondebug_kernelver debug_kernelver + local dir img default_initrd_base var_target_initrd_dir + + if [[ -z $KDUMP_KERNELVER ]]; then + KDUMP_KERNELVER="$(uname -r)" + nondebug_kernelver="$(echo -n "$KDUMP_KERNELVER" | sed -n -e 's/$.*$+debug$/\1/p')" + fi + + # Use nondebug kernel if possible, because debug kernel will consume more memory and may oom. + if [[ -n $nondebug_kernelver ]]; then + dinfo "Trying to use $nondebug_kernelver." + debug_kernelver="$KDUMP_KERNELVER" + KDUMP_KERNELVER="$nondebug_kernelver" + fi + + KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER") + + if ! [[ -e $KDUMP_KERNEL ]]; then + if [[ -n $debug_kernelver ]]; then + dinfo "Fallback to using debug kernel" + KDUMP_KERNELVER="$debug_kernelver" + KDUMP_KERNEL=$(prepare_kdump_kernel "$KDUMP_KERNELVER") + fi + fi if ! [[ -e $KDUMP_KERNEL ]]; then derror "Failed to detect kdump kernel location" -- 2.31.1

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take a look at this projector
by Jim Cole 07 Jun '22

07 Jun '22

1 0

take a look at this projector
by Jim Cole 07 Jun '22

07 Jun '22

1 0

kexec@lists.fedoraproject.org【未知设备登录警告】
by 【管理员】 07 Jun '22

07 Jun '22

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1 0

[PATCH v2] Fix the sync issue for dump_fs
by Tao Liu 06 Jun '22

06 Jun '22

Previously the sync for dump_fs is problematic, it always return success according to man 2 sync. So it cannot detect the error of the dump target is full and not all of vmcore data been written back the disk, which will leave the vmcore imcomplete and report misleading log as "saving vmcore complete". In this patch, we will use "sync -f vmcore" instead, which will return error if syncfs on the dump target fails. In this way, vmcore sync related failures, such as autoextend of lvm2 thinpool fails, can be detected and handled properly. Signed-off-by: Tao Liu <ltao(a)redhat.com> v1 -> v2: make "sync -f" against vmcore-incomplete. --- dracut-kdump.sh | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/dracut-kdump.sh b/dracut-kdump.sh index f4456a1..4852c01 100755 --- a/dracut-kdump.sh +++ b/dracut-kdump.sh @@ -174,9 +174,15 @@ dump_fs() $CORE_COLLECTOR /proc/vmcore "$_dump_fs_path/vmcore-incomplete" _dump_exitcode=$? if [ $_dump_exitcode -eq 0 ]; then - mv "$_dump_fs_path/vmcore-incomplete" "$_dump_fs_path/vmcore" - sync - dinfo "saving vmcore complete" + sync -f "$_dump_fs_path/vmcore-incomplete" + _sync_exitcode=$? + if [ $_sync_exitcode -eq 0 ]; then + mv "$_dump_fs_path/vmcore-incomplete" "$_dump_fs_path/vmcore" + dinfo "saving vmcore complete" + else + derror "sync vmcore failed, exitcode:$_sync_exitcode" + return 1 + fi else derror "saving vmcore failed, exitcode:$_dump_exitcode" return 1 -- 2.33.1

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kexec June 2022