[maemo-developers] N950 SEGFAULT - help?

[From: Tomi Ollila]

On Thu, 6 Oct 2011 22:20:55 -0400, Felipe Crochik <felipe at crochik.com> wrote:
Non-text part: multipart/alternative
> I hit a wall with my application so I am looking for someone to help
> everywhere I can.
> 
> The short version: how can I get qt creator to debug my application on the
> device. Right now I get CRC mismatch warnings for all libraries and I assume
> this is what prevents me to see any trace information
> 
> That is what I get when I start to debug:
> ...
> the debug information found in
> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvrPVR2D_DRI2WSEGL_r125.so"
> does not match
> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvrPVR2D_DRI2WSEGL.so"
> (CRC mismatch).
> 
> the debug information found in
> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvr2d_r125.so"
> does not match
> "c:/qtsdk/madde/sysroots/harmattan-nokia-meego-arm-sysroot-1134-slim/usr/lib/libpvr2d.so"
> (CRC mismatch).
> 
> ...
> I assume I need to install "debug symbols/versions" for the qt libraries on
> the device somehow. Am I right? How can I accomplish this?
> 
> The long version:
> 
> My applications uses qml\webview and everything works fine until I swipe out
> of my application and then later come back to it. With one click or two I
> get a segfault. This is all the information that I managed to get running
> gdb on the device:
> 
> (gdb) backtrace
> #0  0x42068924 in QPainter::save() () from /usr/lib/libQtGui.so.4
> #1  0x48ec294c in ?? () from /usr/lib/libQtWebKit.so.4
> #2  0x48ec294c in ?? () from /usr/lib/libQtWebKit.so.4
> 
> Program received signal SIGSEGV, Segmentation fault.
> 
> Any suggestions?

If you do remote debugging... i.e. that device is running gdbserver
and the cross-gdb is running on host (PC in your case), the libraries
in device and 'sysroot' needs to be in sync. Otherwise the coredump is
pretty likely. 

If you run gdb on device then you need to get the debug libraries on
device installed. That is not a trivial task to perform on N9/N950.

The -1134- part in sysroot name should indicate that it matches the
N9 software version 10.2011.34-1_PR_* which is the one current 
N9 devices are flashed at the factory before shipping.

> Thanks in advance,
> Felipe

Tomi