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See Debugging Fennec with GDB.

Debugging Fennec can be trickier than Firefox because it uses multiple processes.

For example to debug reftests in fennec on desktop linux the following recipe works:

python --debugger=gdb TEST_PATH/reftest.list

once inside gdb

# break on fork calls
(gdb) catch fork 

# break on exec calls
(gdb) catch exec 

(gdb) run 

#the first fork will be for glx probing and can be ignor
(gdb) continue 

#the next fork is the content process, make sure we follow into it
(gdb) set follow-fork-mode child (gdb) continue 

#this will break on the exec
(gdb) break some_function_in_the content process