blob: 6a6a94c07e330c4905b9e4a63387b9129a514c46 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
|
#!/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
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"
}
|
