Odd behavior from GDB while trying to cross-debug an embedded Linux application.
The application normally runs on an embedded platform. Currently, for development purposes, I have the rootfs located @ /exports and the target is communicating over NFS. That way I can make a change on my local system, save the application @ /exports, and run the altered version to see if it will work without having to do a full install on the target itself.
Following this guide I was able to get GDB debugging working or at least I thought I was. However, as soon as I altered my code, built my project and copied/replaced the application with the altered application I received the following errors:
As I mentioned I believe this gdbserver error may be erroneous and explaining why might be tricky so here goes. As I mentioned GDB seemed to be working. For instance, here is the GDB output I was getting:
Truncated/partial Eclipse Debugger Console output (before compiling and copying application):
So, like expected, the application runs and pauses at main. I can then resume the application and debug whatever I need. In fact, I used it to debug a problem then made a change and tested it. It worked, great! However, as soon as I went to debug the application for a different problem I received the errors you read earlier. So why do I think the gdbserver error is erroneous? Well because both applications are using the same exact version of glibc. In fact, the only differences between the two applications is the changes I made to the code and that code works, I know because I tested it.
That being said I am chooseing, XD, to ignore the error reported in the serial terminal and am concentrating on the errors reported by Eclipse, specifically this jumped out at me:
Not sure why there would be a remote communications error, any ideas what might be happening here? Are these glibc errors actually red herrings?
Last edited by Circuits; 02-28-2019 at 02:24 PM..
Reason: Attempting to make more sense XD
Just to be sure I remounted a brand new copy of the rootfs from a branch and then downloaded the Codebase for that branch and repeated the above exercise and got the same behavior. Another thing I find odd, in the debugger console at the end of the output I showed above it says:
but it's actually frozen. Entering y or n does nothing. So I have to manual terminate the debugging session.
I tried running gdb-multiarch from a terminal instead of using it through Eclipse and ended up with similar output except right at the end it says:
So, this doesn't seem to be an Eclipse problem. Maybe it is a gdb-multiarch problem?
EDIT: I take that back the output is jumping all over I tried again running gdb-multiarch with sudo and ended up with the same output as before, no mention of a seg fault.
@Corona688 I reproduced the error without making any changes to the code to be sure that the changes I was making weren't effecting anything. I now believe the error to be a communications error with gdb-server on the embedded side. Gdb-server was installed onto the embedded target something like 5 or 6 years ago while gdb-multiarch is brand new.
I'm sorry if the title is really criptic, but I don't know how to phrase my problem.
I know I can't really ask for a solution, and I normally wouldn't but this is really escaping my abilities.
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