Openwrt/package/boot/kexec-tools/files/kdump.init
Chen Minqiang ec5e8461c1 x86: make crashdump works
1. KERNEL_CRASH_DUMP should depends on KERNEL_PROC_KCORE (kexec use it)
2. select crashkernel mem size by totalmem
   mem <= 256M disable crashkernel by default
   mem >= 4G use 256M for crashkernel
   mem >= 8G use 512M for crashkernel
   default use 128M
3. set BOOT_IMAGE in kdump.init
4. resolve a "Unhandled rela relocation: R_X86_64_PLT32" error

Tested on x86_64

Signed-off-by: Chen Minqiang <ptpt52@gmail.com>
2020-03-20 21:45:06 +00:00

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#!/bin/sh /etc/rc.common
START=41
STOP=90
BOOT_IMAGE=/boot/vmlinuz
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
echo -n "Saving vmcore (this may take a while)..."
# would like 'sparse' but busybox doesn't support it
dd if=/proc/vmcore of="$path/vmcore-$timestamp" conv=fsync bs=1M
echo " done"
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"
}