806957 - JimDB fails to set pending breakpoint on startup

Status: RESOLVED WORKSFORME

(Firefox for Android Graveyard :: JimDB, defect, P1)

Description

[(inactive) Jim Chen [:jchen] [:darchons]]

On Galaxy Nexus, 4.1.1, as reported by kats

Comment 1

[(inactive) Jim Chen [:jchen] [:darchons]]

kats, can you try running 'set stop-on-solib-events 1' before setting the breakpoint? Then everytime a library loads, gdb should stop:

> ...
> Continuing.
> Stopped due to shared library event
> (gdb) c
> Continuing.
> Stopped due to shared library event
> (gdb) c
> Continuing.
> adb| Loaded libs in 26078ms total, 773ms user, 312ms system, 0 faults
>
> Breakpoint 1, 0x63caee28 in nsWindow::nsWindow() ()
>    from /Users/nchen/central/objdir-android/dist/bin/libxul.so
> (gdb)

Also on my Galaxy Nexus 4.1.1, gdb does show the "shlib events" breakpoint. Maybe you can try deleting your moz-gdb/lib/SERIAL directory, and repulling the libraries.

> GNU gdb (GDB) 7.4-android-github.com/darchons
> Copyright (C) 2012 Free Software Foundation, Inc.
> License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
> This is free software: you are free to change and redistribute it.
> There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
> and "show warranty" for details.
> This GDB was configured as "--host=x86_64-apple-darwin12.2.0 --target=arm-elf-linux".
> For bug reporting instructions, please see:
> <http://www.gnu.org/software/gdb/bugs/>.
> New ADB device is "0149E0820D01300B"
> Using device 0149E0820D01300B
> Choices for object directory to use:
> 0. Do not use object directory
> 1. /Users/nchen/central/objdir-android
> 2. /Users/nchen/central/objdir-android-xul
> Choose from above or enter alternative
> : 1
> Using object directory: /Users/nchen/central/objdir-android
> Set sysroot to "/Users/nchen/moz-gdb/lib/0149E0820D01300B".
> Updated solib-search-path.
> Using package org.mozilla.fennec_nchen.
> Launching org.mozilla.fennec_nchen... Done
> Attaching to parent (pid 17425)... as non-root... Done
> Setting up remote debugging... Done
>
> Run another gdb session to debug child process.
>
> Ready. Use "continue" to resume execution.
> (gdb) maint i b
> Num     Type           Disp Enb Address    What
> -5      shlib events   keep y   0x40126aa5 <_start+9157> inf 1
> -6      longjmp master keep n   0x4006d384 <longjmp> inf 1
> -7      longjmp master keep n   0x4006cb80 <_longjmp> inf 1
> -8      longjmp master keep n   0x4006d404 <siglongjmp> inf 1
> -9      jit events     keep y   0x5a55b16c <__jit_debug_register_code> inf 1

Comment 2

[Kartikaya Gupta (email:[e-mail])]

(In reply to Jim Chen [:jchen :nchen] from comment #1)
> kats, can you try running 'set stop-on-solib-events 1' before setting the
> breakpoint? Then everytime a library loads, gdb should stop:
> 

Doing this didn't work initially but after I clobbered by lib/SERIAL folder it did start working. maint i b now also shows the shlib events breakpoint. I guess upgrading the stock ROM from one version to the next requires blowing away the library cache, which makes sense.

Thanks!

Comment 3

[(inactive) Jim Chen [:jchen] [:darchons]]

No problem! It's on my to-do list to make a feature that will detect library changes automatically.