当android系统运行出现死机等致命错误的时候，一般会有堆栈的DEBUG打印信息，一般直接看根本看不出问题是出在哪里！记录下我android4.2 的DEBUG 堆栈log的方法.
撰写不易，转载请注明出处：http://blog.csdn.net/jscese/article/details/38232667
一.DEBUG log
这是我出现错误的堆栈信息：
01-01 08:00:03.376 I/DEBUG ( 929): r0 0000000e r1 00000000 r2 00000002 r3 00000000 01-01 08:00:03.376 I/DEBUG ( 929): r4 404cd890 r5 00000002 r6 00000000 r7 0000000e 01-01 08:00:03.376 I/DEBUG ( 929): r8 404ccddc r9 404cd414 sl 404cd414 fp 404cd894 01-01 08:00:03.376 I/DEBUG ( 929): ip 00000073 sp 404ccd20 lr 4012aec1 pc 40124570 cpsr 20000010 01-01 08:00:03.376 I/DEBUG ( 929): d0 7664206e69207961 d1 656c646e61682020 01-01 08:00:03.376 I/DEBUG ( 929): d2 6f69746974726150 d3 332064656464416e 01-01 08:00:03.376 I/DEBUG ( 929): d4 30636d6d2f30636d d5 6c622f313030303a 01-01 08:00:03.376 I/DEBUG ( 929): d6 62636d6d2f6b636f d7 62636d6d2f306b6c 01-01 08:00:03.376 I/DEBUG ( 929): d8 0000000000000000 d9 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d10 0000000000000000 d11 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d12 0000000000000000 d13 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d14 0000000000000000 d15 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d16 000000000c7f0000 d17 000000000c800000 01-01 08:00:03.376 I/DEBUG ( 929): d18 4163fc8780000000 d19 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d20 0000000000000000 d21 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d22 0000000000000000 d23 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d24 0000000000000000 d25 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d26 0000000000000000 d27 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d28 0000000000000000 d29 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): d30 0000000000000000 d31 0000000000000000 01-01 08:00:03.376 I/DEBUG ( 929): scr 00000010 01-01 08:00:03.380 I/DEBUG ( 929): 01-01 08:00:03.380 I/DEBUG ( 929): backtrace: 01-01 08:00:03.380 I/DEBUG ( 929): #00 pc 00019570 /system/lib/libc.so (strlen+16) 01-01 08:00:03.380 I/DEBUG ( 929): #01 pc 0001febd /system/lib/libc.so (__vfprintf+2124) 01-01 08:00:03.380 I/DEBUG ( 929): #02 pc 00021303 /system/lib/libc.so (vsnprintf+70) 01-01 08:00:03.380 I/DEBUG ( 929): #03 pc 0000139d /system/lib/liblog.so (__android_log_buf_print+44) 01-01 08:00:03.380 I/DEBUG ( 929): #04 pc 0000cfd7 /system/bin/vold 01-01 08:00:03.380 I/DEBUG ( 929): 01-01 08:00:03.380 I/DEBUG ( 929): stack: 01-01 08:00:03.380 I/DEBUG ( 929): 404ccce0 404cd474 01-01 08:00:03.380 I/DEBUG ( 929): 404ccce4 40128f73 /system/lib/libc.so 01-01 08:00:03.380 I/DEBUG ( 929): 404ccce8 404cd414 01-01 08:00:03.380 I/DEBUG ( 929): 404cccec 404ccd98 01-01 08:00:03.380 I/DEBUG ( 929): 404cccf0 00000000 01-01 08:00:03.380 I/DEBUG ( 929): 404cccf4 404ccd98 01-01 08:00:03.380 I/DEBUG ( 929): 404cccf8 00000001 01-01 08:00:03.384 I/DEBUG ( 929): 404cccfc 4001d821 /system/bin/vold 01-01 08:00:03.384 I/DEBUG ( 929): 404ccd00 0000002d 01-01 08:00:03.384 I/DEBUG ( 929): 404ccd04 404ccddc 01-01 08:00:03.384 I/DEBUG ( 929): 404ccd08 404cd414 01-01 08:00:03.384 I/DEBUG ( 929): 404ccd0c ffffffff 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd10 00000001 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd14 4012a667 /system/lib/libc.so 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd18 df0027ad 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd1c 00000000 01-01 08:00:03.388 I/DEBUG ( 929): #00 404ccd20 00000000 01-01 08:00:03.388 I/DEBUG ( 929): ........ ........ 01-01 08:00:03.388 I/DEBUG ( 929): #01 404ccd20 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd24 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd28 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd2c 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd30 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd34 00000073 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd38 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd3c ffffffff 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd40 404ccddc 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd44 4001d85a /system/bin/vold 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd48 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd4c 00000034 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd50 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd54 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd58 4001d824 /system/bin/vold 01-01 08:00:03.388 I/DEBUG ( 929): 404ccd5c 00000000 01-01 08:00:03.388 I/DEBUG ( 929): ........ ........ 01-01 08:00:03.388 I/DEBUG ( 929): #02 404cd400 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404cd404 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404cd408 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404cd40c 00000000 01-01 08:00:03.388 I/DEBUG ( 929): 404cd410 00004000 01-01 08:00:03.388 I/DEBUG ( 929): 404cd414 404cd474 01-01 08:00:03.388 I/DEBUG ( 929): 404cd418 4014d498 /system/lib/libc.so 01-01 08:00:03.388 I/DEBUG ( 929): 404cd41c 000003ff 01-01 08:00:03.388 I/DEBUG ( 929): 404cd420 ffff0208 [vectors] 01-01 08:00:03.388 I/DEBUG ( 929): 404cd424 404cd474 01-01 08:00:03.388 I/DEBUG ( 929): 404cd428 000003ff 01-01 08:00:03.388 I/DEBUG ( 929): 404cd42c 4001d578 /system/bin/vold 01-01 08:00:03.388 I/DEBUG ( 929): 404cd430 00000003 01-01 08:00:03.388 I/DEBUG ( 929): 404cd434 404cd474 01-01 08:00:03.388 I/DEBUG ( 929): 404cd438 00000003 01-01 08:00:03.388 I/DEBUG ( 929): 404cd43c 401072a3 /system/lib/liblog.so (__android_log_buf_write+186) 01-01 08:00:03.388 I/DEBUG ( 929): ........ ........ 01-01 08:00:03.392 I/DEBUG ( 929): 01-01 08:00:03.392 I/DEBUG ( 929): memory near r4: 01-01 08:00:03.392 I/DEBUG ( 929): 404cd870 404cdb7c 689886ea 40021d88 404cd8b4 01-01 08:00:03.392 I/DEBUG ( 929): 404cd880 404cd9fc 404cdb7c 40010fdb 4001d824 01-01 08:00:03.392 I/DEBUG ( 929): 404cd890 0000000e 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8a0 00000000 40584a00 40584af8 40584be8 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8b0 00000000 0000000e 000000b3 0000000e 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8c0 40584bb6 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8d0 401815fc 000000f9 000000c0 000000bf 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8e0 0000655f 40021d88 00000001 40129b39 01-01 08:00:03.392 I/DEBUG ( 929): 404cd8f0 404cd968 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd900 00004000 404cd9f0 00000000 7fffffdb 01-01 08:00:03.392 I/DEBUG ( 929): 404cd910 ffff0208 689886ea 7fffffff 689886ea 01-01 08:00:03.392 I/DEBUG ( 929): 404cd920 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd930 00000000 00000000 404cda0c 404cd9fc 01-01 08:00:03.392 I/DEBUG ( 929): 404cd940 404cdb7c 4057217c 40572158 40021d88 01-01 08:00:03.392 I/DEBUG ( 929): 404cd950 00000001 40129aeb 404cd9cc 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd960 404cd9d4 00000000 00000000 404cda60 01-01 08:00:03.392 I/DEBUG ( 929): 01-01 08:00:03.392 I/DEBUG ( 929): memory near r8: 01-01 08:00:03.392 I/DEBUG ( 929): 404ccdbc 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404ccdcc 00000000 00000000 4001d824 00000034 01-01 08:00:03.392 I/DEBUG ( 929): 404ccddc 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404ccdec 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404ccdfc 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce0c 00000000 00000000 00000000 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce1c 00000000 404cd60f 40128f73 404cd5ed 01-01 08:00:03.392 I/DEBUG ( 929): 404cce2c 40128f73 404cd55c 404ccee0 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce3c 404ccee0 00000002 4001d68f 00000001 01-01 08:00:03.392 I/DEBUG ( 929): 404cce4c 404ccf24 404cd55c ffffffff fffffff7 01-01 08:00:03.392 I/DEBUG ( 929): 404cce5c 4012a667 404cd9dc 4012b88d 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce6c 00000000 00000000 00000073 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce7c 00000073 00000008 00000000 00000009 01-01 08:00:03.392 I/DEBUG ( 929): 404cce8c 4001d68e 00000000 00000032 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cce9c 00000000 4001d664 00000000 4014d498 01-01 08:00:03.392 I/DEBUG ( 929): 404cceac 4014d4a8 00000000 40156228 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 01-01 08:00:03.392 I/DEBUG ( 929): memory near r9: 01-01 08:00:03.392 I/DEBUG ( 929): 404cd3f4 40021d88 00000001 4012c307 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd404 00000000 00000000 00000000 00004000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd414 404cd474 4014d498 000003ff ffff0208 01-01 08:00:03.392 I/DEBUG ( 929): 404cd424 404cd474 000003ff 4001d578 00000003 01-01 08:00:03.392 I/DEBUG ( 929): 404cd434 404cd474 00000003 401072a3 00000000 01-01 08:00:03.392 I/DEBUG ( 929): 404cd444 404cd404 404cd444 00000001 4001d578 01-01 08:00:03.396 I/DEBUG ( 929): 404cd454 0000000d 404cd474 0000002e 40156228 01-01 08:00:03.396 I/DEBUG ( 929): 404cd464 4001d578 40156228 401073a1 404cd890 01-01 08:00:03.396 I/DEBUG ( 929): 404cd474 6563736a 64206573 6c707369 69207961 01-01 08:00:03.396 I/DEBUG ( 929): 404cd484 7664206e 61682020 656c646e 74726150 01-01 08:00:03.396 I/DEBUG ( 929): 404cd494 6f697469 6464416e 33206465 0000000a 01-01 08:00:03.396 I/DEBUG ( 929): 404cd4a4 00000000 00000000 38663735 62353536 01-01 08:00:03.396 I/DEBUG ( 929): 404cd4b4 00000000 00000000 00000000 00000000 01-01 08:00:03.396 I/DEBUG ( 929): 404cd4c4 00000000 00000000 00000000 00000000 01-01 08:00:03.396 I/DEBUG ( 929): 404cd4d4 00000000 00000000 00000000 00000000 01-01 08:00:03.396 I/DEBUG ( 929): 404cd4e4 00000000 00000000 00000000 00000000
需要分析上面的DEBUG，只需要提取一部分内容然后保存到一个 txt 文本里面，提取如下内容：
#00 pc 00019570 /system/lib/libc.so #01 pc 0001febd /system/lib/libc.so #02 pc 00021303 /system/lib/libc.so #03 pc 0000139d /system/lib/liblog.so #04 pc 0000caa9 /system/bin/vold
保存到error.txt,需要注意保存内容的间隔对齐。
二.python
需要一个分析上面提取出来的error.txt DEBUG 信息 DEBUG.py：
#!/usr/bin/python
# stack symbol parser
import os
import string
import sys
#define android product name
ANDROID_PRODUCT_NAME = 'gotechcn'
ANDROID_WORKSPACE = os.getcwd()+"/"
# addr2line tool path and symbol path
addr2line_tool = ANDROID_WORKSPACE + 'prebuilts/gcc/linux-x86/arm/arm-eabi-4.6/bin/arm-eabi-addr2line'
symbol_dir = ANDROID_WORKSPACE + 'out/target/product/' + ANDROID_PRODUCT_NAME +'/symbols'
symbol_bin = symbol_dir + '/system/bin/'
symbol_lib = symbol_dir + '/system/lib/'
class ReadLog:
def __init__(self,filename):
self.logname = filename
def parse(self):
f = file(self.logname,'r')
lines = f.readlines()
if lines != []:
print 'read file ok'
else:
print 'read file failed'
result =[]
for line in lines:
if line.find('stack') != -1:
print 'stop search'
break
elif line.find('system') != -1:
#print 'find one item' + line
result.append(line)
return result
class ParseContent:
def __init__(self,addr,lib):
self.address = addr # pc address
self.exename = lib # executable or shared library
def addr2line(self):
cmd = addr2line_tool + " -C -f -s -e " + symbol_dir + self.exename + " " + self.address
#print cmd
stream = os.popen(cmd)
lines = stream.readlines()
list = map(string.strip,lines)
return list
inputarg = sys.argv
if len(inputarg) < 2:
print 'Please input panic log'
exit()
filename = inputarg[1]
readlog = ReadLog(filename)
inputlist = readlog.parse()
for item in inputlist:
itemsplit = item.split()
test = ParseContent(itemsplit[-2],itemsplit[-1])
list = test.addr2line()
print "%-30s%s" % (list[1],list[0])
这个python脚本是google提供的，用来分析DEBUG，需要注意的是配置自己相对应的ANDROID_PRODUCT_NAME，用来在你的android源码里面找对应的工具，我的product_name 为 “gotechcn”。
addr2line_tool 的路径各个android 版本可能也有所不同，需要自己根据自己的源码进行配置.
我这android4.2 还需要cp OUT/system/lib/egl/libGLES_android.so 到 OUT/system/lib目录下 供上面的脚本使用
三.解析
在上面两步做好之后，将DEBUG.py 以及 error.txt cp 到 android 源码的根目录下，执行：
python DEBUG.py error.txt
根据我上面的error.txt 可得到如下结果：
read file ok strlen.c:52 strlen string.h:221 strlen vsnprintf.c:61 vsnprintf stdio.h:490 __android_log_buf_print DirectVolume.cpp:291 DirectVolume::handleDiskChanged(char const*, NetlinkEvent*)
这就是出问题的根源，可根据这个DEBUG