iOS crash reports: atos not working as expected

A simpler alternative: you can use the atos -l flag to make it do the maths for you.

Say you've got the following line in your crash log that you want to symbolicate:

5   MyApp                   0x0044e89a 0x29000 + 4348058

The first hex number is the stack address, and the second hex number is the load address. You can ignore the last number. You don't need to worry about slide addresses either.

To symbolicate, do the following:

atos -o MyApp.app/MyApp -arch armv7 -l 0x29000 0x0044e89a

If you can't find your MyApp.app/MyApp file, rename your '.ipa' file to a '.zip', unzip it, and it'll be in the Payload folder.

And if you're not sure which architecture to use (for example, armv7 or armv7s), scroll to the 'Binary Images' part of the crash file and you can find it in there.

Cheers

You have to calculate the address to use with atos, you can't just use the one in the stacktrace.

symbol address = slide + stack address - load address

1. The slide value is the value of vmaddr in LC_SEGMENT cmd (Mostly this is 0x1000). Run the following to get it:

   otool -arch ARCHITECTURE -l "APP_BUNDLE/APP_EXECUTABLE" | grep -B 3 -A 8 -m 2 "__TEXT"

   Replace ARCHITECTURE with the actual architecture the crash report shows, e.g. armv7.Replace APP_BUNDLE/APP_EXECUTABLE with the path to the actual executable.

2. The stack address is the hex value from the crash report.

3. The load address can be is the first address showing in the Binary Images section at the very front of the line which contains your executable. (Usually the first entry).

Since in the past value of the slide was equal to value of the load address this always worked. But since Apple introduced Address space layout randomization beginning with iOS 4.3 (in different variations), the apps loading address is randomized for security reasons.

Simply use dwarfdump:

dwarfdump --arch armv7 myApp.dSYM --lookup 0xaabbccdd | grep 'Line table'

No need to do any calculations at all.

(From Get symbol by address (symbolicating binary, iOS build)).