how to analysis breakpad

[tomorrow chen]

Hi ALL

I'm working on android platform.

Could anybody tell me how to analysis the breadpad output from logcat, or how to pull the crash dump and decode it like "https://www.chromium.org/developers/decoding-crash-dumps" said?

I have read "https://www.chromium.org/developers/crash-reports", but it doesn't work in android.

Maybe because it only work in mac/windows/linux.

Could anybody tell me how to do it in android?

[Mikhail Lopatkin]

Hi,

 

To decode breakpad's output from logcat (the so called microdump) you should follow instructions for linux from here https://www.chromium.org/developers/decoding-crash-dumps, but instead of building and running minidump_stackwalk you should use microdump_stackwalk and use text file with logcat output as an input (instead of foo.dmp).

 

You can (and probably should) build both dump_syms and microdump_stackwalk inside of your Android checkout (with target_os=android set in args.gn); both tools should be run on the desktop, of course.

 

-- 

Mikhail Lopatkin.

 

 

 

23.11.2016, 10:28, "tomorrow chen" <tomorr...@gmail.com>:

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[tomorrow chen]

Hi Lopatkin

Thanks a lot!

I can get stacktrace without symbols now.

Yet failed to get the debugging symbols.

Following is my step:

./dump_syms  $SRC/out/Release/lib/libxwalkcore.so  $SRC/out/Release/xwalk_core_library/libs/armeabi-v7a/libxwalkcore.so >~/my_symbols/libxwalkcore.sym

 $SRC/out/Release/lib/libxwalkcore.so is the so with symbol ,$SRC/out/Release/xwalk_core_library/libs/armeabi-v7a/libxwalkcore.so  is so without symbol.

./microdump_stackwalk -m ~/log/breakpad.log ~/my_symbols

Yet there's still stacktrace without symbol.

Am I right with dump_syms arguments?

 

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[Mikhail Lopatkin]

Hi,

 

You should only supply your library with symbols for dump_syms:

./dump_syms  $SRC/out/Release/lib/libxwalkcore.so > ~/my_symbols/libxwalkcore.sym

 

Then you should follow the instruction https://www.chromium.org/developers/decoding-crash-dumps and read carefully about where to place symbol file.

 

First, find the module hash, e.g. by running

head ~/my_symbols/libxwalkcore.sym

and copying hexadecimal string from the line that says MODULE (your hash will be different):

MODULE Linux arm 88E4FFA94D467358B692B6E56B44193C0 libxwalkcore.so

 

After that you have to make a sub-tree and put your symbols file into it:

mkdir -p ~/my_symbols/libxwalkcore.so/88E4FFA94D467358B692B6E56B44193C0/

mv ~/my_symbols/libxwalkcore.sym ~/my_symbols/libxwalkcore.so/88E4FFA94D467358B692B6E56B44193C0/

 

You may want to compare hash from the module and hash from the breakpad log if you're not sure that the log comes from the samy library you have locally.

 

Then you can run ./microdump_stackwalk -m ~/log/breakpad.log ~/my_symbols

-- 

Mikhail Lopatkin.

 

 

 

28.11.2016, 09:36, "tomorrow chen" <tomorr...@gmail.com>:

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[tomorrow chen]

Hi Lopatkin

Thanks for your kind help.

I followed your step ,yet it doesn't work for me.

I suspect microdump did not try to locate the sym.

There's not such output when symbols directory is empty

"

[time stamp] simple_symbol_supplier.cc:150: INFO: No symbol file at /tmp/my_symbols/libfoo/hash/libfoo.sym"

So even I generate the sym in the folder, it has not impact. And display the same content with the command without sym.

I also check the hash code. It's match.

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