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SirG · 02-04-2019, 14:13

Fully updated Linux Mint 19.1; have been using opencpn for years (kudos!)
After update to 5.0.0, opencpn crashes after I hit OK on the initial disclaimer dialog with:

Quote:

The program 'opencpn' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadValue (integer parameter out of range for operation)'.
(Details: serial 3174 error_code 2 request_code 154 minor_code 24)

Bottom of the log shows:

Quote:

17:07:27 EDT: Opencpn language set to: en_US
17:07:27 EDT: Loading Configs catalog: /home/sergey/.opencpn/Configs/configs.xml
17:07:41 EDT: Creating MyFrame...size(1291, 1046) position(115, 34)
17:07:41 EDT: Error: can't open file '/home/sergey/.opencpn/mmsitoname.csv' (error 2: No such file or directory)

Nothing else in the log looks interesting.

Please help troubleshoot.

Thanks!

nohal · 02-04-2019, 15:09

Install GDB

Code:

sudo apt-get install gdb

point the debugger to OpenCPN

Code:

gdb /usr/bin/opencpn

Start the process

Code:

run

Let it crash and then generate the backtrace

Code:

bt

Post the output here

Thanks

Pavel

SirG · 02-04-2019, 16:24

Hi Pavel, thanks for the response.
The error is apparently being generated asynchronously, according to the rest of the message:

Code:

The error was 'BadValue (integer parameter out of range for operation)'.
  (Details: serial 3048 error_code 2 request_code 154 minor_code 24)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
[Inferior 1 (process 7619) exited with code 01]

I tried running opencpn with --sync and setting a break on gdk_x_error, as suggested, but no success (see above). The cause is that none of my libs have symbols, so the break is set as pending on future lib load:

Code:

Function "gdk_x_error" not defined.
Make breakpoint pending on future shared library load? (y or [n]) y
Breakpoint 1 (gdk_x_error) pending.

, but I suspect it never succeeds, since the symbol never shows up.

Suggestions? I will be happy to install some -dbg lib packages, if you can recommend which ones are needed.

Thanks!
---Sergey

nohal · 02-04-2019, 16:38

It seems to be somewhere deep in Gnome/X/drivers. I personally would probably rather switch distributions than trying to debug this (which I suppose is not what you wanted to hear)...
If I wanted to do the debugging, I would first start without any configuration (mv ~/.opencpn ~/.opencpn.bak) to discard something caused by your settings and then started stepping through the code from the place where the last log message is, but describing that is a little too complex for a forum post - it can be done either from an IDE, some GDB frontend like DDD or GDB directly (RMS's gdb Tutorial: How do I watch the execution of my program?), but in any case you should be building the opencpn binary locally.

Pavel

SirG · 02-04-2019, 17:56

Thinks for the advice:

Quote:

[...]rather switch distributions than trying to debug this (which I suppose is not what you wanted to hear).

You read my mind

(re)moving ~/.opencpn does not help
running with -no_opengl does not help, which is surprising: the reported code 154 is a GLX:GetHistogram opcode; I am not very familiar with X/OpenGL innards, but I would expect disabling OpenGL would eliminate glx ops

I'm fine with running gdb: I've used it plenty, although not recently.
Looks like I can use your Dockerfile to build/debug. Are the build instructions on the wiki under Compiling on Linux reasonably up to date?

I will probably not get around to it until this weekend or the next.

Thanks,
---Sergey