[erlang-bugs] Segmentation fault in wxErlang

Dan Gudmundsson <>
Sun Aug 15 12:54:22 CEST 2010


Thanks
I will have a look at it.

/Dan

On Sun, Aug 15, 2010 at 12:02 PM, Sergei Golovan <> wrote:
> Hi!
>
> A Debian user recently found a bug in wxErlang (in the current Erlang
> R14A). It consistently segfaults when playing with sudoku demo.
>
> I couldn't reproduce it with my default SMP settings (+S 8) but it
> breaks soon (in a few minutes) after the application start and
> interacting with the game field if Erlang VM is started with +S 1
> option.
>
> So, I run
>
> % erl -pa /usr/lib/erlang/lib/wx-0.98.6/examples/sudoku +S 1
> Erlang R14A (erts-5.8) [source] [smp:1:1] [rq:1] [async-threads:0]
> [kernel-poll:false]
>
> Eshell V5.8  (abort with ^G)
> 1> sudoku:start().
> <0.34.0>
> sudoku:40: Time: 3556875
> Below level 39 40
> Below level 34 35
> Below level 29 30
> Below level 24 25
> No left 24
>
> Then I start playing, putting numbers there and there...
> After a while:
>
> 2> zsh: segmentation fault (core dumped)  erl -pa
> /usr/lib/erlang/lib/wx-0.98.6/examples/sudoku +S 1
>
> Below is a GDB session listing. I would be glad to provide any
> additional info if required.
>
> Core was generated by `/usr/lib/erlang/erts-5.8/bin/beam.smp -S 1 --
> -root /usr/lib/erlang -progname e'.
> Program terminated with signal 11, Segmentation fault.
> [New process 11376]
> [New process 11387]
> [New process 11366]
> [New process 11373]
> [New process 11372]
> [New process 11370]
> [New process 11371]
> #0  0xf51e7a75 in WxeApp::dispatch_cb (this=0x8453398,
> batch=0x84942b0, temp=0x8494240, process=835)
>    at wxe_impl.cpp:411
> 411               if(event->caller == process ||  // Callbacks from CB
> process only
> (gdb) bt
> #0  0xf51e7a75 in WxeApp::dispatch_cb (this=0x8453398,
> batch=0x84942b0, temp=0x8494240, process=835)
>    at wxe_impl.cpp:411
> #1  0xf51e7c0a in handle_event_callback (port=0x240, process=643) at
> wxe_impl.cpp:306
> #2  0xf528d0cc in sendevent (event=0xf2c81ab4, port=0x240) at
> gen/wxe_events.cpp:821
> #3  0xf528e496 in wxeEvtListener::forward (this=0x857ece0,
> event=@0xf2c81ab4) at gen/wxe_events.cpp:328
> #4  0xf49e77f1 in wxAppConsole::HandleEvent () from
> /usr/lib/libwx_baseu-2.8.so.0
> #5  0xf4a849ca in wxEvtHandler::ProcessEventIfMatches () from
> /usr/lib/libwx_baseu-2.8.so.0
> #6  0xf4a84b56 in wxEvtHandler::SearchDynamicEventTable () from
> /usr/lib/libwx_baseu-2.8.so.0
> #7  0xf4a85c8d in wxEvtHandler::ProcessEvent () from
> /usr/lib/libwx_baseu-2.8.so.0
> #8  0xf4c45fd0 in wxWindow::GtkSendPaintEvents () from
> /usr/lib/libwx_gtk2u_core-2.8.so.0
> #9  0xf4c4658d in ?? () from /usr/lib/libwx_gtk2u_core-2.8.so.0
> #10 0xf45e6816 in ?? () from /usr/lib/libgtk-x11-2.0.so.0
> #11 0x084aa220 in ?? ()
> #12 0xf2c82070 in ?? ()
> #13 0x085ec2f8 in ?? ()
> #14 0xf4398678 in ?? () from /usr/lib/libgobject-2.0.so.0
> #15 0x0857ee30 in ?? ()
> #16 0x0857f320 in ?? ()
> #17 0xf2c81c18 in ?? ()
> #18 0xf436790b in g_closure_invoke () from /usr/lib/libgobject-2.0.so.0
> Backtrace stopped: frame did not save the PC
> Current language:  auto; currently c++
> (gdb) print event
> $1 = (wxeCommand *) 0xf11023e8
> (gdb) print event->caller
> $2 = 611
> (gdb) print process
> $3 = 835
> (gdb) print event->op
> $4 = 10
> (gdb) print memenv
> $5 = (wxeMemEnv *) 0x0
> (gdb) print event->port
> $6 = (ErlDrvPort) 0x23f
> (gdb)
>
> All observed segfaults were at the same place in WxeApp::dispatch_cb() function.
>
> (The Erlang was built without Debian-specific patches and with symbols enabled.)
>
> Cheers!
> --
> Sergei Golovan
>
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