split kexec-tools into two packages, kexec and kdump.
* kexec to simply execute a new kernel
* kdump is for loading and collecting debris of a crashed kernel with
support for kdump forensics.
In order to properly support booting into a crashkernel, an init script
as well as UCI configuration has been added.
As modifying the kernel cmdline is required for this to work in x86
platforms use an uci-defaults script to modify /boot/grub/grub.cfg.
To test collecting crash information, use the 'c' sysrq-trigger, ie.
echo c > /proc/sysrq-trigger
This should result in the crash kernel being executed and (depending
on the configution) dmesg and/or vmcore getting saved.
To check if the crash kernel was loaded properly, use the 'status'
command of the kdump init script.
Signed-off-by: Daniel Golle <daniel@makrotopia.org>
menu "Configuration"
- depends on PACKAGE_kexec-tools
-
-config KEXEC_TOOLS_kdump
- bool
- prompt "kdump support"
- default n
- help
- Include the kdump utility.
+ depends on PACKAGE_kexec
config KEXEC_ZLIB
bool
include $(TOPDIR)/rules.mk
PKG_NAME:=kexec-tools
-PKG_VERSION:=2.0.14-rc1
+PKG_VERSION:=2.0.14
PKG_RELEASE:=1
PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
PKG_SOURCE_URL:=@KERNEL/linux/utils/kernel/kexec
-PKG_HASH:=3fc505ff8d8a2d24c68aac5e6b4783997d5a086966ff3de8b05a0ceb27e5e23b
+PKG_HASH:=ffb2e7e99d9d08754c6bc1922aed3c000094f318665d82a72ecc76c4ff1c0dc6
PKG_FIXUP:=autoreconf
include $(INCLUDE_DIR)/package.mk
-define Package/kexec-tools
+define Package/kexec-tools/Default
SECTION:=utils
CATEGORY:=Utilities
- DEPENDS:=@armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips +KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma
- TITLE:=Kernel boots kernel
URL:=http://kernel.org/pub/linux/kernel/people/horms/kexec-tools/
MAINTAINER:=Florian Fainelli <florian@openwrt.org>
- MENU:=1
+endef
+
+define Package/kexec-tools
+ $(call Package/kexec-tools/Default)
+ TITLE:=kexec-tools transition meta package
+ DEPENDS:=+kexec
endef
define Package/kexec-tools/description
- kexec is a set of systems call that allows you to load
+ kexec is a set of system calls that allows you to load
another kernel from the currently executing Linux kernel.
+ The kexec utility allows to load and boot another kernel.
endef
-define Package/kexec-tools/config
+define Package/kexec
+ $(call Package/kexec-tools/Default)
+ TITLE:=Kernel boots kernel
+ DEPENDS:=\
+ @armeb||@arm||@i386||@x86_64||@powerpc64||@mipsel||@mips \
+ +KEXEC_ZLIB:zlib +KEXEC_LZMA:liblzma @KERNEL_KEXEC
+endef
+
+define Package/kexec/description
+ The kexec utility allows to load and boot another kernel.
+endef
+
+define Package/kdump
+ $(call Package/kexec-tools/Default)
+ TITLE:=Kernel crash analysis
+ DEPENDS:=+kexec @i386||@x86_64||@arm @KERNEL_CRASH_DUMP
+endef
+
+define Package/kdump/description
+ The kdump package allows to automatically boot into a
+ special kernel for analyzing kernel crashes using kdump.
+endef
+
+define Package/kexec/config
source "$(SOURCE)/Config.in"
endef
BUILD_CC="$(HOSTCC)" \
TARGET_CC="$(TARGET_CC)"
-kexec-extra-sbin-$(CONFIG_KEXEC_TOOLS_kdump) += kdump
-
define Build/Compile
$(MAKE) -C $(PKG_BUILD_DIR) DESTDIR="$(PKG_INSTALL_DIR)" all install
endef
define Package/kexec-tools/install
+ :
+endef
+
+define Package/kexec/install
$(INSTALL_DIR) $(1)/usr/sbin
- $(INSTALL_BIN) \
- $(addprefix $(PKG_INSTALL_DIR)/usr/sbin/, \
- $(kexec-extra-sbin-y)) \
- $(kexec-extra-bin-y) \
- $(PKG_INSTALL_DIR)/usr/sbin/kexec \
- $(1)/usr/sbin
+ $(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kexec $(1)/usr/sbin
# make a link for compatability with other distros
$(INSTALL_DIR) $(1)/sbin
$(LN) ../usr/sbin/kexec $(1)/sbin/kexec
endef
+define Package/kdump/install
+ $(INSTALL_DIR) $(1)/usr/sbin $(1)/etc/init.d $(1)/etc/config $(1)/etc/uci-defaults
+ $(INSTALL_BIN) $(PKG_INSTALL_DIR)/usr/sbin/kdump $(PKG_INSTALL_DIR)/usr/sbin/vmcore-dmesg $(1)/usr/sbin
+ $(INSTALL_BIN) ./files/kdump.init $(1)/etc/init.d/kdump
+ $(INSTALL_BIN) ./files/kdump.defaults $(1)/etc/uci-defaults/kdump
+ $(INSTALL_CONF) ./files/kdump.config $(1)/etc/config/kdump
+endef
+
+define Package/kdump/prerm
+#!/bin/sh
+
+case $$(uname -m) in
+ i?86|x86_64)
+ if grep -q " crashkernel=" /boot/grub/grub.cfg; then
+ mount /boot -o remount,rw
+ sed -i 's/ crashkernel=[^ ]*//' /boot/grub/grub.cfg
+ mount /boot -o remount,ro
+ fi
+ ;;
+esac
+endef
+
$(eval $(call BuildPackage,kexec-tools))
+$(eval $(call BuildPackage,kexec))
+$(eval $(call BuildPackage,kdump))
--- /dev/null
+
+config kdump
+ option enabled '1'
+ option save_dmesg '1'
+ option save_vmcore '0'
+# using an external partition to store vmcore is highly recommended!
+# option path '/mnt/crashdump'
--- /dev/null
+#!/bin/sh
+
+case $(uname -m) in
+ i?86|x86_64)
+ if ! grep -q crashkernel /boot/grub/grub.cfg; then
+ mount /boot -o remount,rw
+ sed -i 's/linux.*/& crashkernel=32M@32M/' /boot/grub/grub.cfg
+ mount /boot -o remount,ro
+ fi
+ ;;
+esac
--- /dev/null
+#!/bin/sh /etc/rc.common
+
+START=41
+STOP=98
+
+EXTRA_COMMANDS="status"
+EXTRA_HELP=" status Print crashkernel status"
+
+verify_kdump() {
+ local cfg="$1"
+ local enabled
+ local path
+ local save_vmcore
+ local save_dmesg
+
+ config_get_bool enabled "$cfg" enabled 1
+ config_get_bool save_dmesg "$cfg" save_dmesg 1
+ config_get_bool save_vmcore "$cfg" save_vmcore 0
+
+ [ "$enabled" -gt 0 ] || return 2
+
+ [ "$save_dmesg" -gt 0 ] || [ "$save_vmcore" -gt 0 ] || return 2
+
+ config_get path "$cfg" path "/"
+
+ [ -d "$path" ] || mkdir -p "$path" 2>/dev/null || return 1
+}
+
+run_kdump() {
+ local cfg="$1"
+ local enabled
+ local path
+ local save_vmcore
+ local save_dmesg
+
+ config_get_bool enabled "$cfg" enabled 1
+ [ "$enabled" -gt 0 ] || return
+
+ config_get_bool save_dmesg "$cfg" save_dmesg 1
+ config_get_bool save_vmcore "$cfg" save_vmcore 0
+ config_get path "$cfg" path "/"
+
+ timestamp=$(date "+%Y%m%dT%H%M%S")
+
+ if [ "$save_vmcore" -eq 1 ]; then
+ # would like 'sparse' but busybox doesn't support it
+ dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
+ fi
+
+ if [ "$save_dmesg" -eq 1 ]; then
+ vmcore-dmesg /proc/vmcore > "$path/dmesg-$timestamp"
+ fi
+
+ sync
+ reboot -f
+}
+
+find_kernel() {
+ . /lib/functions.sh
+ local kernel
+
+ kernel="$BOOT_IMAGE"
+ if [ -r "$kernel" ]; then
+ echo $kernel
+ return 0
+ fi
+
+ kernel="$(find_mtd_part kernel)"
+ if [ -r "$kernel" ]; then
+ echo $kernel
+ return 0
+ fi
+
+ for voldir in /sys/class/ubi/ubi*_*; do
+ [ ! -e "$voldir" ] && continue
+ if [ "$(cat "${voldir}/name")" = "kernel" ]; then
+ kernel="/dev/$(basename "$voldir")"
+ echo $kernel
+ return 0
+ fi
+ done
+
+ return 1
+}
+
+load_crashkernel() {
+ local append_cmdline
+ local kernel
+
+ kernel="$(find_kernel)"
+ [ $? -gt 0 ] && return 1
+
+ case "$(uname -m)" in
+ i?86|x86_64)
+ grep -q "crashkernel=" /proc/cmdline || return 1
+ append_cmdline="1 irqpoll reset_devices maxcpus=1"
+ ;;
+ arm*)
+ append_cmdline="1 maxcpus=1 reset_devices"
+ ;;
+ esac
+ kexec -p "$kernel" --reuse-cmdline --append="$append_cmdline"
+ return $?
+}
+
+start() {
+ local retval
+
+ if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+ return 1
+ fi
+
+ if [ -e /proc/vmcore ]; then
+ config_load kdump
+ config_foreach run_kdump kdump
+ else
+ config_load kdump
+ config_foreach verify_kdump kdump
+ retval=$?
+ [ $retval = 1 ] && return 1
+ [ $retval = 0 ] && load_crashkernel
+ return $?
+ fi
+}
+
+stop() {
+ [ "$(cat /sys/kernel/kexec_crash_loaded)" = "1" ] || return
+
+ if [ -e "$BOOT_IMAGE" ]; then
+ kexec -p -u "$BOOT_IMAGE"
+ fi
+}
+
+status() {
+ local retval kernel
+
+ if [ ! -e /sys/kernel/kexec_crash_loaded ]; then
+ echo "crashdump not supported by kernel"
+ return
+ fi
+
+ if [ $(cat /sys/kernel/kexec_crash_size) -eq 0 ]; then
+ echo "memory for crashdump kernel not reserved!"
+ echo "check crashkernel= kernel cmdline parameter"
+ echo "(a reboot is required after installing kdump)"
+ return
+ fi
+
+ kernel="$(find_kernel)"
+ if [ $? -gt 0 ]; then
+ echo "cannot find kernel image"
+ return
+ else
+ echo "using kernel image $kernel"
+ fi
+
+ echo -n "kdump configuration is "
+ config_load kdump
+ retval=$?
+ if [ $retval = 0 ]; then
+ if [ "$(config_foreach echo kdump)" ]; then
+ config_foreach verify_kdump kdump
+ retval=$?
+ else
+ retval=1
+ fi
+ fi
+
+ if [ $retval = 0 ]; then
+ echo "valid"
+ elif [ $retval = 2 ]; then
+ echo "disabled"
+ else
+ echo "BROKEN"
+ fi
+
+ echo -n "kexec crash kernel "
+ if [ "$(cat /sys/kernel/kexec_crash_loaded)" = "0" ]; then
+ echo -n "not "
+ fi
+ echo "loaded"
+}
projects / openwrt / openwrt.git / commitdiff