Develop Reference

Android: building a static aarch64 gdb

I am having a lot of trouble using gdbserver and gdbserver64 on Android and the companion aarch64 gdb on my host. For example, I run into issues like this, where gdb is outputting what seems to be nonsense:
(gdb) target remote :5039
Remote debugging using :5039
warning: Could not load vsyscall page because no executable was specified
try using the "file" command first.
0x0000007fa7921d2c in ?? ()
(gdb) bt
Python Exception <type 'exceptions.ImportError'> No module named gdb.frames:
#0 0x0000007fa7921d2c in ?? ()
#1 0x0000000040000600 in ?? ()
Backtrace stopped: Cannot access memory at address 0x22eee199476794f4
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0000007f87c249b4 in ?? ()
(gdb) x/4i $pc
=> 0x7f87c249b4: ldrb w8, [x0,#432]
0x7f87c249b8: cbz w8, 0x7f87c249ec
0x7f87c249bc: ldr x8, [x19,#3632]
0x7f87c249c0: ldr x9, [x8,#24]
(gdb) bt
Python Exception <type 'exceptions.ImportError'> No module named gdb.frames:
#0 0x0000007f87c249b4 in ?? ()
#1 0x0000007fa4b4fb25 in ?? ()
#2 0x0000000000000001 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) c
Continuing.
[New Thread 22374]
[New Thread 22375]
Program received signal SIGSEGV, Segmentation fault.
0x0000007f87c249b4 in ?? ()
(gdb) c
Continuing.
Program received signal SIGSEGV, Segmentation fault.
0x0000007f87c249b4 in ?? ()
This is almost impossible to use, with everything being totally unhelpful. No symbols are loaded and no backtraces are even remotely reasonable. The app is also repeatedly signaled in places that it is not signaled at when being straced or traced using a static gdb (just to name one specific problem with it).
However, I was able to use a prebuilt armv7a statically linked gdb binary to debug some 32-bit applications in an Android emulator with relative ease. I ran the static gdb in a device shell without issue. I had no trouble loading symbols and had no odd signaling problems.
I couldn't find a statically linked aarch64 gdb binary anywhere, so I tried to build one inside my aarch64 chroot. I did manage to build gdb for aarch64, and I used these configure flags:
LDFLAGS="-static" ../configure --prefix=/noprefix --enable-static --disable-shared --disable-interprocess-agent --disable-libcc1
But it is dynamically linked, which is not what I wanted.
root#gram:/opt/gdb-aarch64/noprefix/bin# file gdb
gdb: ELF 64-bit LSB shared object, ARM aarch64, version 1 (SYSV), dynamically linked, interpreter /lib/ld-linux-aarch64.so.1, for GNU/Linux 3.7.0, BuildID[sha1]=f1a630e569467794c45b4389f510720c4342704b, not stripped
How do I build a statically linked linux aarch64 gdb?

NDK r11b: help needed using the ndk-gdb.py debugger

Platform is Mac, Using NDK r11b, my application consists of around 8 c/c++ so files. In the past I've used ndk-gdb (sh) script via NDK r10e. the shell script is now deprecated and ndk-gdb.py is now the only option. Problem is I can't get it to work. I'm running it from my project folder as I've always done.
I've tried multiple command line options with no luck. It feels like it isn't finding my source files. It launches the application with the "Waiting for Debugger". I get to the (gdb) prompt. I've tried adding breakpoints with no luck breaking at reliable interrupt points.
I need some pointers as to how to configure and use the python version for ndk-gdb. Google has removed the documentation files and I can't find anything anywhere that suffices as a guide.
Some command lines I've tried.
ndk-gdb --launch --verbose This launches the application but blocks on Waiting for debugger
ndk-gdb will attach to a running process. ctr-c will pause the execution but a back trace bt lists a corrupt stack.
ndk-gdb --launch -t -v -p $ProjectDir I get a new interface I'm not familiar with and it states [ No Source Available ]
Any help or insight would be appreciated

Same story for me - I was able to get past "Waiting for Debugger" message for a new debugging session by issuing ndk-gdb --launch --force --nowait
but still ndk-gdb doesn't work well even with Google's NDK samples.
Only info thread command produces the actual result except of stack traces - bt, info stack and others complaints on the corrupt stack.
My target device is Nexus 5 running API 23 with latest updates.
The same binaries compiled by NDK r11b could be successfully debugged by GDB 7.7 from a previous NDK r10e.
On Windows, ndk-gdb.py fails with the following error message:
Traceback (most recent call last):
File "F:\work\android-ndk-r11b\prebuilt\windows\bin\ndk-gdb.py", line 704, in <module>
main()
File "F:\work\android-ndk-r11b\prebuilt\windows\bin\ndk-gdb.py", line 583, in main
args.props = device.get_props()
File "F:\work\android-ndk-r11b\python-packages\adb\device.py", line 459, in get_props
raise RuntimeError('invalid getprop line: "{}"'.format(line))
RuntimeError: invalid getprop line: ""
Actually, it looks like ndk-gdb.py from NDK r11b only works on Linux:
vagrant#vagrant:/vagrant/native_activity$ $ANDROID_NDK_ROOT/ndk-gdb --launch --force
WARNING: Failed to find jdb on your path, defaulting to --nowait
Redirecting gdbclient output to /tmp/gdbclient-9150
GNU gdb (GDB) 7.10
...
This GDB was configured as "x86_64-linux-gnu".
...
warning: Could not load shared library symbols for 110 libraries, e.g. /system/lib/libcutils.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
0xb6c93894 in __epoll_pwait () from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
(gdb) info sources
Source files for which symbols have been read in:
Source files for which symbols will be read in on demand:
/Volumes/Android/buildbot/tmp/build/toolchain/gcc-4.9/gcc/include/unwind-arm-common.h,
/Volumes/Android/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/libgcc/config/arm/pr-support.c,
/Volumes/Android/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/libgcc/config/arm/libunwind.S,
/Volumes/Android/buildbot/tmp/build/toolchain/gcc-4.9/arm-linux-androideabi/armv7-a/libgcc/./unwind.h,
/Volumes/Android/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/libgcc/unwind-arm-common.inc,
/Volumes/Android/buildbot/src/android/gcc/toolchain/build/../gcc/gcc-4.9/libgcc/config/arm/unwind-arm.c,
/Users/mike/android-ndk-r11b/sources/android/native_app_glue/android_native_app_glue.c,
/vagrant/native_activity/jni/main.c
Basic commands is working correctly:
(gdb) bt
#0 0xb6c93894 in __epoll_pwait () from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
#1 0xb6c6ce72 in epoll_pwait () from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
#2 0xb6c6ce80 in epoll_wait () from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
#3 0xb6ebfc5a in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
(gdb) info thread
Id Target Id Frame
11 Thread 28735 0xb6c6a5e4 in syscall ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
10 Thread 28733 0xb6c93894 in __epoll_pwait ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
9 Thread 28721 0xb6c939bc in __ioctl ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
8 Thread 28720 0xb6c939bc in __ioctl ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
7 Thread 28719 0xb6c6a5e4 in syscall ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
6 Thread 28718 0xb6c6a5e4 in syscall ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
5 Thread 28717 0xb6c6a5e4 in syscall ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
4 Thread 28716 0xb6c6a5e4 in syscall ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
3 Thread 28715 0xb6c94948 in recvmsg ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
2 Thread 28714 0xb6c93b68 in __rt_sigtimedwait ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so
* 1 Thread 28709 0xb6c93894 in __epoll_pwait ()
from /vagrant/native_activity/obj/local/armeabi-v7a/system/lib/libc.so

This issue was posted to the https://github.com/android-ndk/ndk/issues site that Mikhail provided. The issue was assigned and claimed fixed: Resolution will be propagated in NDK r11c;
https://github.com/android-ndk/ndk/issues/51
additionally I updated to R11c. everything is now working

I can not see the symbol from loaded coredump using gdb

all~
I can not see the symbol from loaded coredump using gdb.
I loaded the coredump file as below sequence.
$gdb
(gdb) core-file vold.corefile
[New LWP 3833]
[New LWP 3834]
[New LWP 3835]
Core was generated by `/system/bin/vold'.
Program terminated with signal 3, Quit.
#0 0xb6eaffc8 in ?? ()
(gdb) symbol-file ./out/target/product/msm8974/obj/EXECUTABLES/vold_intermediates/LINKED/vold
Reading symbols from /home/p14291/MSM8974_KK/SYS/EF63/MSM8974_KK/out/target/product/msm8974/obj/EXECUTABLES/vold_intermediates/LINKED/vold...done.
(gdb) bt
#0 0xb6eaffc8 in ?? ()
#1 0xb6ebd316 in ?? ()
#2 0xb6ebd316 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)
As you see, I can not see the any symbol information.
How to see the symbol information on backtrace?

I can not see the any symbol information.
This most often happens when you load the wrong binary into GDB. You should
Use the canonical way to invoke GDB:
gdb out/target/product/msm8974/obj/EXECUTABLES/vold vold.core
Confirm that your binary out/target/product/msm8974/obj/EXECUTABLES/vold is exactly the same as /system/bin/vold on the target system that generated the core dump (modulo stripping -- if one binary is a stripped version of another, that's ok).

android NDK: gdb crashes when connecting

As a followup to this (I got gdbserver starting properly): Android NDK debugging: armeabi-v7a not working
NDK 8c, Eclipse & Cygwin, NativeActivity.
I set a breakpoint in the while loop here:
void android_main( android_app* state )
{
int stop = 0;
int x = 5;
while( stop == 0 )
{
x++;
}
... but gdb crashes when connecting! It does "stuff" for about 10 seconds, then crashes. There is some output.
Here's the gdbserver output:
Android NDK installation path: /cygdrive/e/uppercut/sdks/android-ndk
Using default adb command: /cygdrive/e/uppercut/sdks/android-sdk/platform-tools/adb
ADB version found: Android Debug Bridge version 1.0.31
Using ADB flags:
Using auto-detected project path: .
Found package name: com.example.radgame
ABIs targetted by application: armeabi-v7a
Device API Level: 15
Device CPU ABIs: armeabi-v7a armeabi
Compatible device ABI: armeabi-v7a
Using gdb setup init: ./libs/armeabi-v7a/gdb.setup
Using toolchain prefix: /cygdrive/e/uppercut/sdks/android-ndk/toolchains/arm-linux-androideabi-4.6/prebuilt/windows/bin/arm-linux-androideabi-
Using app out directory: ./obj/local/armeabi-v7a
Found debuggable flag: true
Found device gdbserver: /data/data/com.example.radgame/lib/gdbserver
Found data directory: '/data/data/com.example.radgame'
Found running PID: 3218
Launched gdbserver succesfully.
Setup network redirection
## COMMAND: adb_cmd shell run-as com.example.radgame lib/gdbserver +debug-socket --attach 3218
## COMMAND: adb_cmd forward tcp:5039 localfilesystem:/data/data/com.example.radgame/debug-socket
Attached; pid = 3218
Listening on Unix socket debug-socket
## COMMAND: adb_cmd pull /system/bin/app_process obj/local/armeabi-v7a/app_process
3204 KB/s (9848 bytes in 0.003s)
Pulled app_process from device/emulator.
## COMMAND: adb_cmd pull /system/bin/linker obj/local/armeabi-v7a/linker
7732 KB/s (39592 bytes in 0.005s)
Pulled linker from device/emulator.
## COMMAND: adb_cmd pull /system/lib/libc.so obj/local/armeabi-v7a/libc.so
6994 KB/s (286536 bytes in 0.040s)
Pulled libc.so from device/emulator.
<waits while gdb connects...>
Remote debugging from host 0.0.0.0
libthread_db:td_ta_new: Probing system for platform bug.
<lots of repetitive lines...>
libthread_db:td_ta_new: Victory: We can debug theads!
readchar: Got EOF
Remote side has terminated connection. GDBserver will reopen the connection.
Listening on Unix socket debug-socket
The last several lines are its response to gdb connecting and crashing.
Here's the gdb output:
Reading symbols from E:\uppercut\prototype\build\code\androidp4\radgame\obj\local\armeabi-v7a\app_process...done.
WARNING: no debugging symbols found in E:\uppercut\prototype\build\code\androidp4\radgame\obj\local\armeabi-v7a\app_process.
Either the binary was compiled without debugging information
or the debugging information was removed (e.g., with strip or strip -g).
Debugger capabilities will be very limited.
For further information: http://wiki/Main/GdbFaq#No_debugging_symbols_found
89-gdb-set confirm off
(gdb)
89^done
(gdb)
90-gdb-set width 0
90^done
(gdb)
91-gdb-set height 0
91^done
(gdb)
92-interpreter-exec console echo
92^done
(gdb)
93-gdb-show prompt
93^done,value="(gdb) "
(gdb)
94-gdb-set target-async 0
94^done
(gdb)
95-gdb-set auto-solib-add on
95^done
(gdb)
96-gdb-set stop-on-solib-events 0
96^done
(gdb)
97-gdb-set stop-on-solib-events 1
97^done
(gdb)
98-target-select remote localhost:5039
=thread-group-started,id="i1",pid="42000"
=thread-created,id="1",group-id="i1"
&"warning: while parsing target library list (at line 2): No segment defined for com.example.radgame\n"
warning: while parsing target library list (at line 2): No segment defined for com.example.radgame
=library-loaded,id="/system/bin/linker",target-name="/system/bin/linker",host-name="E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame/./obj/local/armeabi-v7a/linker",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libc.so",target-name="libc.so",host-name="E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame/./obj/local/armeabi-v7a/libc.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstdc++.so",target-name="libstdc++.so",host-name="libstdc++.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libm.so",target-name="libm.so",host-name="libm.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="liblog.so",target-name="liblog.so",host-name="liblog.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libcutils.so",target-name="libcutils.so",host-name="libcutils.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libz.so",target-name="libz.so",host-name="libz.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libtime_genoff.so",target-name="libtime_genoff.so",host-name="libtime_genoff.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libutils.so",target-name="libutils.so",host-name="libutils.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libbinder.so",target-name="libbinder.so",host-name="libbinder.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libexpat.so",target-name="libexpat.so",host-name="libexpat.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libcrypto.so",target-name="libcrypto.so",host-name="libcrypto.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libgabi++.so",target-name="libgabi++.so",host-name="libgabi++.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libicuuc.so",target-name="libicuuc.so",host-name="libicuuc.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libicui18n.so",target-name="libicui18n.so",host-name="libicui18n.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libssl.so",target-name="libssl.so",host-name="libssl.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstlport.so",target-name="libstlport.so",host-name="libstlport.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libnativehelper.so",target-name="libnativehelper.so",host-name="libnativehelper.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libnetutils.so",target-name="libnetutils.so",host-name="libnetutils.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libGLESv2_dbg.so",target-name="libGLESv2_dbg.so",host-name="libGLESv2_dbg.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libEGL.so",target-name="libEGL.so",host-name="libEGL.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libwpa_client.so",target-name="libwpa_client.so",host-name="libwpa_client.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libhardware_legacy.so",target-name="libhardware_legacy.so",host-name="libhardware_legacy.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libpixelflinger.so",target-name="libpixelflinger.so",host-name="libpixelflinger.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libhardware.so",target-name="libhardware.so",host-name="libhardware.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libemoji.so",target-name="libemoji.so",host-name="libemoji.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libjpeg.so",target-name="libjpeg.so",host-name="libjpeg.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsecnativefeature.so",target-name="libsecnativefeature.so",host-name="libsecnativefeature.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libharfbuzz.so",target-name="libharfbuzz.so",host-name="libharfbuzz.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libquramimagecodec.so",target-name="libquramimagecodec.so",host-name="libquramimagecodec.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libskia.so",target-name="libskia.so",host-name="libskia.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libui.so",target-name="libui.so",host-name="libui.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libGLESv2.so",target-name="libGLESv2.so",host-name="libGLESv2.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmemalloc.so",target-name="libmemalloc.so",host-name="libmemalloc.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libQcomUI.so",target-name="libQcomUI.so",host-name="libQcomUI.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libremotedesktop_client.so",target-name="libremotedesktop_client.so",host-name="libremotedesktop_client.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libgui.so",target-name="libgui.so",host-name="libgui.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libcamera_client.so",target-name="libcamera_client.so",host-name="libcamera_client.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsqlite.so",target-name="libsqlite.so",host-name="libsqlite.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libqc-opt.so",target-name="libqc-opt.so",host-name="libqc-opt.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libdvm.so",target-name="libdvm.so",host-name="libdvm.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libGLESv1_CM.so",target-name="libGLESv1_CM.so",host-name="libGLESv1_CM.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libETC1.so",target-name="libETC1.so",host-name="libETC1.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsisodrm.so",target-name="libsisodrm.so",host-name="libsisodrm.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsonivox.so",target-name="libsonivox.so",host-name="libsonivox.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright_foundation.so",target-name="libstagefright_foundation.so",host-name="libstagefright_foundation.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmedia.so",target-name="libmedia.so",host-name="libmedia.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libQmageDecoder.so",target-name="libQmageDecoder.so",host-name="libQmageDecoder.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libnfc_ndef.so",target-name="libnfc_ndef.so",host-name="libnfc_ndef.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libusbhost.so",target-name="libusbhost.so",host-name="libusbhost.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libhwui.so",target-name="libhwui.so",host-name="libhwui.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libtilerenderer.so",target-name="libtilerenderer.so",host-name="libtilerenderer.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libbluedroid.so",target-name="libbluedroid.so",host-name="libbluedroid.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libdbus.so",target-name="libdbus.so",host-name="libdbus.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libandroid_runtime.so",target-name="libandroid_runtime.so",host-name="libandroid_runtime.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libvorbisidec.so",target-name="libvorbisidec.so",host-name="libvorbisidec.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright_yuv.so",target-name="libstagefright_yuv.so",host-name="libstagefright_yuv.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libdrmframework.so",target-name="libdrmframework.so",host-name="libdrmframework.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libpowermanager.so",target-name="libpowermanager.so",host-name="libpowermanager.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libdiag.so",target-name="libdiag.so",host-name="libdiag.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libaudcal.so",target-name="libaudcal.so",host-name="libaudcal.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libacdbloader.so",target-name="libacdbloader.so",host-name="libacdbloader.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libalsa-intf.so",target-name="libalsa-intf.so",host-name="libalsa-intf.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libchromium_net.so",target-name="libchromium_net.so",host-name="libchromium_net.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright_amrnb_common.so",target-name="libstagefright_amrnb_common.so",host-name="libstagefright_amrnb_common.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright_enc_common.so",target-name="libstagefright_enc_common.so",host-name="libstagefright_enc_common.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright_avc_common.so",target-name="libstagefright_avc_common.so",host-name="libstagefright_avc_common.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsavscmn.so",target-name="libsavscmn.so",host-name="libsavscmn.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsavsff.so",target-name="libsavsff.so",host-name="libsavsff.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libsurfaceflinger_client.so",target-name="libsurfaceflinger_client.so",host-name="libsurfaceflinger_client.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libtvoutinterface.so",target-name="libtvoutinterface.so",host-name="libtvoutinterface.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libtvoutservice.so",target-name="libtvoutservice.so",host-name="libtvoutservice.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmm-abl-oem.so",target-name="libmm-abl-oem.so",host-name="libmm-abl-oem.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmm-abl.so",target-name="libmm-abl.so",host-name="libmm-abl.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libstagefright.so",target-name="libstagefright.so",host-name="libstagefright.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmtp.so",target-name="libmtp.so",host-name="libmtp.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libexif.so",target-name="libexif.so",host-name="libexif.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libmedia_jni.so",target-name="libmedia_jni.so",host-name="libmedia_jni.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libbcc.so",target-name="libbcc.so",host-name="libbcc.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libbcinfo.so",target-name="libbcinfo.so",host-name="libbcinfo.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libRS.so",target-name="libRS.so",host-name="libRS.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="librs_jni.so",target-name="librs_jni.so",host-name="librs_jni.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libandroid.so",target-name="libandroid.so",host-name="libandroid.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libv8.so",target-name="libv8.so",host-name="libv8.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libwebcore.so",target-name="libwebcore.so",host-name="libwebcore.so",symbols-loaded="0",thread-group="i1"
=library-loaded,id="libradgame.so",target-name="libradgame.so",host-name="E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame/./obj/local/armeabi-v7a/libradgame.so",symbols-loaded="0",thread-group="i1"
&"warning: Could not load shared library symbols for 83 libraries, e.g. libstdc++.so.\nUse the \"info sharedlibrary\" command to see the complete listing.\nDo you need \"set solib-search-path\" or \"set sysroot\"?"
&"\n"
warning: Could not load shared library symbols for 83 libraries, e.g. libstdc++.so.
Use the "info sharedlibrary" command to see the complete listing.
Do you need "set solib-search-path" or "set sysroot"?
&"warning: Breakpoint address adjusted from 0xb00056f5 to 0xb00056f4.\n"
warning: Breakpoint address adjusted from 0xb00056f5 to 0xb00056f4.
*stopped,frame={addr="0x4004d738",func="__futex_syscall3",args=[],from="E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame/./obj/local/armeabi-v7a/libc.so"},thread-id="1",stopped-threads="all",core="0"
98^connected
(gdb)
99 info proc
&"info proc\n"
&"Undefined info command: \"proc\". Try \"help info\".\n"
99^error,msg="Undefined info command: \"proc\". Try \"help info\"."
(gdb)
100-environment-cd E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame
100^done
(gdb)
101 info program
&"info program\n"
~"Debugging a target over a serial line.\n"
~"Program stopped at 0x4004d738.\n"
~"It stopped with signal SIGTRAP, Trace/breakpoint trap.\n"
~"Type \"info stack\" or \"info registers\" for more information.\n"
101^done
(gdb)
102 info threads
&"info threads\n"
=thread-created,id="2",group-id="i1"
~"[New Thread 3219]\n"
=thread-created,id="3",group-id="i1"
~"[New Thread 3223]\n"
=thread-created,id="4",group-id="i1"
~"[New Thread 3224]\n"
=thread-created,id="5",group-id="i1"
~"[New Thread 3225]\n"
=thread-created,id="6",group-id="i1"
~"[New Thread 3226]\n"
=thread-created,id="7",group-id="i1"
~"[New Thread 3229]\n"
=thread-created,id="8",group-id="i1"
~"[New Thread 3230]\n"
=thread-created,id="9",group-id="i1"
~"[New Thread 3231]\n"
=thread-created,id="10",group-id="i1"
~"[New Thread 3233]\n"
=thread-created,id="11",group-id="i1"
~"[New Thread 3317]\n"
=thread-created,id="12",group-id="i1"
~"[New Thread 3320]\n"
~" Id Target Id Frame \n"
~" 12 Thread 3320 0x4004c7fc in __ioctl () from E:\\uppercut\\prototype\\build\\code\\androidp4\\radgame/./obj/local/armeabi-v7a/libc.so\n"
I have had debugging working before with gdb, with a Java entry point and 'armeabi'. After switching to C++ entry point (android_main) and 'armeabi-v7a', gdb crashes. I don't know if either is related...
For what it's worth, gdb also crashes any other time I connect (I remove the infinite while loop on startup). For example I'm having thread issues, so my app hangs for no apparent reason. If I connect when it's hung, then gdb crashes in the same way.

This was due to one or both of these GCC compiler flags, which I had added while switching to armeabi-v7a, and then forgot about.
-gstabs+ -g
The version of gdb that comes with the NDK must not like those flags.

Not able to hit the break point in ndk-gdb in Android

Development Environment:
NDK: r7
SDK & Tools: r15
AVD: GB2.3.3, API Level 10
I wrote a test application in which thread will be launched in the native. I Kept a break point in the thread. (Intially when i tried on Galaxy S2 i was getting an error, "Thread debugging not supported in this Platform". So i created an AVD 2.3.3 Level 10).
After this i was getting an error like this
#0 0xafd0c51c in epoll_wait () from /Volumes/SecureCode/webos/rta/android/obj/local/armeabi/libc.so
#1 0xa81216a6 in ?? ()
I googled and found this Solution (Link Here).
I followed the guide lines there
$ adb pull /system/lib lib
$ ndk-gdb
...
(gdb) set solib-search-path lib
But after this also I am not able to hit the break point. I am still getting stuck at this poll_wait() and not moving forward.
D:\EclipseTestWorkspace\CallbackJava>sh
sh-4.1$ ndk-gdb --force --start --verbose
Android NDK installation path: /cygdrive/c/Android/android-ndk
Using default adb command: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb
ADB version found: Android Debug Bridge version 1.0.29
Using final ADB command: '/cygdrive/c/Android/android-sdk-windows/platform-tools/adb'
Using auto-detected project path: .
Found package name: com.callback
ABIs targetted by application: armeabi
Device API Level: 10
Device CPU ABI: armeabi
Compatible device ABI: armeabi
Found debuggable flag: true
Found device gdbserver: /data/data/com.callback/lib/gdbserver
Using gdb setup init: ./libs/armeabi/gdb.setup
Using toolchain prefix: /cygdrive/c/Android/android-ndk/toolchains/arm-linux-androideabi-4.4.3/prebuilt/windows/bin/arm-linux-androideabi-
Using app out directory: ./obj/local/armeabi
Found data directory: '/data/data/com.callback'
Found first launchable activity: .CallbackJavaActivity
Launching activity: com.callback/.CallbackJavaActivity
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb shell am start -n com.callback/.CallbackJavaActivity
Starting: Intent { cmp=com.callback/.CallbackJavaActivity }
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb shell sleep 2
Found running PID: 352
Launched gdbserver succesfully.
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb shell run-as com.callback lib/gdbserver +debug-socket --attach 352
Setup network redirection
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb forward tcp:5039 localfilesystem:/data/data/com.callback/debug-socket
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb pull /system/bin/app_process obj/local/armeabi/app_process
Attached; pid = 352
Listening on sockaddr socket debug-socket
19 KB/s (5660 bytes in 0.281s)
Pulled app_process from device/emulator.
## COMMAND: /cygdrive/c/Android/android-sdk-windows/platform-tools/adb pull /system/lib/libc.so obj/local/armeabi/libc.so
80 KB/s (273868 bytes in 3.325s)
Pulled libc.so from device/emulator.
GNU gdb 6.6
Copyright (C) 2006 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "--host=i586-mingw32msvc --target=arm-elf-linux".
(no debugging symbols found)
Error while mapping shared library sections:
/system/bin/linker: No such file or directory.
----- So many similar errors -----
Error while mapping shared library sections:
gralloc.default.so: No such file or directory.
(no debugging symbols found)
warning: Unable to find dynamic linker breakpoint function.
GDB will be unable to debug shared library initializers
and track explicitly loaded dynamic code.
warning: shared library handler failed to enable breakpoint
0xafd0c51c in epoll_wait () from D:/EclipseTestWorkspace/CallbackJava/obj/local/armeabi/libc.so
(gdb) set solib-search-path lib
Error while mapping shared library sections:
/system/bin/linker: No such file or directory.
Error while mapping shared library sections:
gralloc.default.so: No such file or directory.
Symbol file not found for /system/bin/linker
Reading symbols from D:\EclipseTestWorkspace\CallbackJava/lib/libc.so...(no debugging symbols found)...done.
Loaded symbols for D:\EclipseTestWorkspace\CallbackJava/lib/libc.so
----- So many similar errors -----
Loaded symbols for D:\EclipseTestWorkspace\CallbackJava/lib/libwebcore.so
Symbol file not found for gralloc.default.so
(gdb) file ./libs/armeabi/libcallbacks.so
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from D:\EclipseTestWorkspace\CallbackJava/./libs/armeabi/libcallbacks.so...(no debugging symbols found)...done.
(gdb) file ./obj/local/armeabi/libcallbacks.so
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from D:\EclipseTestWorkspace\CallbackJava/./obj/local/armeabi/libcallbacks.so...done.
(gdb) break callbacks_java.cpp:appcallback_register
Breakpoint 1 at 0x1a64: file D:/EclipseTestWorkspace/CallbackJava/jni/callbacks_java.cpp, line 419.
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x00001a64 in appcallback_register at D:/EclipseTestWorkspace/CallbackJava/jni/callbacks_java.cpp:419
(gdb) where
#0 0xafd0c51c in epoll_wait () from D:\EclipseTestWorkspace\CallbackJava/lib/libc.so
#1 0xa81211b4 in android::Looper::pollInner () from D:\EclipseTestWorkspace\CallbackJava/lib/libutils.so
#2 0x00000000 in ?? ()
(gdb) where
#0 0xafd0c51c in epoll_wait () from D:\EclipseTestWorkspace\CallbackJava/lib/libc.so
#1 0xa81211b4 in android::Looper::pollInner () from D:\EclipseTestWorkspace\CallbackJava/lib/libutils.so
#2 0x00000000 in ?? ()
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0x1a64: Input/output error.
(gdb)
Which i would like to concentrate on main part as
(gdb) file ./libs/armeabi/libcallbacks.so
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from D:\EclipseTestWorkspace\CallbackJava/./libs/armeabi/libcallbacks.so...(no debugging symbols found)...done.
(gdb) file ./obj/local/armeabi/libcallbacks.so
A program is being debugged already.
Are you sure you want to change the file? (y or n) y
Reading symbols from D:\EclipseTestWorkspace\CallbackJava/./obj/local/armeabi/libcallbacks.so...done.
(gdb) break callbacks_java.cpp:appcallback_register
Breakpoint 1 at 0x1a64: file D:/EclipseTestWorkspace/CallbackJava/jni/callbacks_java.cpp, line 419.
(gdb) info breakpoints
Num Type Disp Enb Address What
1 breakpoint keep y 0x00001a64 in appcallback_register at D:/EclipseTestWorkspace/CallbackJava/jni/callbacks_java.cpp:419
(gdb) where
#0 0xafd0c51c in epoll_wait () from D:\EclipseTestWorkspace\CallbackJava/lib/libc.so
#1 0xa81211b4 in android::Looper::pollInner () from D:\EclipseTestWorkspace\CallbackJava/lib/libutils.so
#2 0x00000000 in ?? ()
(gdb) where
#0 0xafd0c51c in epoll_wait () from D:\EclipseTestWorkspace\CallbackJava/lib/libc.so
#1 0xa81211b4 in android::Looper::pollInner () from D:\EclipseTestWorkspace\CallbackJava/lib/libutils.so
#2 0x00000000 in ?? ()
(gdb) c
Continuing.
Warning:
Cannot insert breakpoint 1.
Error accessing memory address 0x1a64: Input/output error.
(gdb)
So from the last error what i understand is its considering the absolute address 0x1a64. Its not considering the relative address (runtime address), so not able to hit the break point. and also its getting stuck at the epoll_wait () , not moving further.
Will any one please help me how can I proceed further?
Thanks & Regards,
SSuman185

You could try debugging in Eclipse with DS-5 CE plugin. Tutorial how to install and setup it you can find here http://forums.arm.com/index.php?/topic/15575-arm-ds-5-tutorial-for-android/ (last post is how to make it work on SGS2).
I know that is not an exact answer to your question, but if you need NDK debugging on SGS2 you might want to try it, also it's for Eclipse, not a command line gdb (but who could ever prefer command-line debugging instead of debugging in IDE??)
PS. DS-5 CE is a first NDK debugging tool that worked for me with SGS2 (it's not perfect - possibly because of bugs/limitations in SGS2 - but at least works).