kexec-tools: bump version and add support for crashdump kernel
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>
This commit is contained in:
parent
8b486ec2b5
commit
5e4bb476c0
5 changed files with 265 additions and 24 deletions
|
@ -1,12 +1,5 @@
|
|||
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
|
||||
|
|
|
@ -8,12 +8,12 @@
|
|||
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
|
||||
|
||||
|
@ -21,22 +21,49 @@ PKG_CONFIG_DEPENDS := CONFIG_KEXEC_ZLIB CONFIG_KEXEC_LZMA
|
|||
|
||||
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
|
||||
|
||||
|
@ -65,24 +92,45 @@ CONFIGURE_VARS += \
|
|||
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))
|
||||
|
|
7
package/boot/kexec-tools/files/kdump.config
Normal file
7
package/boot/kexec-tools/files/kdump.config
Normal file
|
@ -0,0 +1,7 @@
|
|||
|
||||
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'
|
11
package/boot/kexec-tools/files/kdump.defaults
Normal file
11
package/boot/kexec-tools/files/kdump.defaults
Normal file
|
@ -0,0 +1,11 @@
|
|||
#!/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
|
182
package/boot/kexec-tools/files/kdump.init
Executable file
182
package/boot/kexec-tools/files/kdump.init
Executable file
|
@ -0,0 +1,182 @@
|
|||
#!/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"
|
||||
}
|
Loading…
Reference in a new issue