Segfault when -p flag used

[virtualdxs]

I'm just getting in to APRS and I've hit a problem. Perhaps the shell output is the best way to demonstrate:

Ξ ~ → direwolf
Dire Wolf version 1.3
Includes optional support for:  gpsd

Reading config file direwolf.conf
Audio device for both receive and transmit: default  (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate, DTMF decoder enabled.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)
Ready to accept AGW client application 0 on port 8000 ...
Use -p command line option to enable KISS pseudo terminal.
Ready to accept KISS client application on port 8001 ...
^C
QRT
Ξ ~ → direwolf -p
Dire Wolf version 1.3
Includes optional support for:  gpsd

Reading config file direwolf.conf
Audio device for both receive and transmit: default  (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate, DTMF decoder enabled.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)
zsh: segmentation fault (core dumped)  direwolf -p
↑139 ~ →

OS: Arch Linux
Compiled from latest source with

git clone https://github.com/wb2osz/direwolf/
make
sudo make install

[dranch]

Please try building the "dev" branch (1.4-DEV) and see if you can reproduce the segfault. If you can, please provide a backtrack on resulting core file.

[virtualdxs]

Reproduced on dev branch. Something I just noticed: if JACK isn't running it doesn't run and complains, so somehow it's detecting that I use JACK. But the JACK device that shows up seems to be an ALSA bridge.

[virtualdxs]

I don't know how to do anything with traces, but if you have a guide I can follow I will.

[dranch]

Please post your direwolf config but technically speaking, Direwolf only supports low level ALSA devices (not higher level sound systems such as pulseaudio, not portaudio, not jack)

[virtualdxs]

I just figured out that that was because of Cadence's alsa-jack bridge. However, the segfault still occurs with said bridge disabled, so that is not the culprit. Direwolf config follows: On second thought here's a pastebin.

[wb2osz]

Do this to figure out where it is crashing:

Edit Makefile.linux. Look for this line: "CFLAGS := -O3 -pthread -Igeotranz" and add " -g" to the end.

Type commands:

make clean
make
gdb ./direwolf

When you get the "(gdb)" prompt, type "run -p".

Note that any command line options that would normally go with direwolf are put here instead.

When it crashes, type "backtrace" to find out where it is and how it got there.

Type "quit" to get out.

[dranch]

From the output of the initial startup of Direwolf, it shows:

"Audio device for both receive and transmit: default (channel 0)"

You didn't configured a sound card in the direwolf.conf file (ADEVICE) so it's using the default sound device which is shown above as "default" which is actually a PulseAudio device. Please follow the Direwolf User Guide on how to find and configure your ALSA device into the direwolf.conf file. It would look like something like:

ADEVICE plughw:1,0

--David

[virtualdxs]

Thanks, I'll let you know the results

[virtualdxs]

Didn't fix it.

Ξ ~ → direwolf -p
Dire Wolf DEVELOPMENT version 1.4 C (Oct 27 2016)
Includes optional support for:  gpsd

Reading config file direwolf.conf
Audio device for both receive and transmit: plughw:0,0  (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)
Ready to accept AGW client application 0 on port 8000 ...
Ready to accept KISS client application on port 8001 ...
zsh: segmentation fault (core dumped)  direwolf -t 0 -p
↑139 ~ →

[dranch]

Bummer.. well, follow John's use of gdb and see if you can get a backtrace of the issue

[virtualdxs]

Ξ ~git/direwolf git:(dev) ▶ gdb ./direwolf
GNU gdb (GDB) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./direwolf...done.
(gdb) run -p -t 0
Starting program: /var/git/direwolf/direwolf -p -t 0
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Dire Wolf DEVELOPMENT version 1.4 C (Oct 30 2016)
Includes optional support for:  gpsd

Reading config file direwolf.conf
Audio device for both receive and transmit: default  (channel 0)
[New Thread 0x7fffef764700 (LWP 26304)]
[New Thread 0x7fffeef63700 (LWP 26305)]
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)
[New Thread 0x7fffee762700 (LWP 26306)]
[New Thread 0x7fffedf61700 (LWP 26307)]
Ready to accept AGW client application 0 on port 8000 ...
[New Thread 0x7fffed760700 (LWP 26308)]
[New Thread 0x7fffecf5f700 (LWP 26309)]
[New Thread 0x7fffdfffe700 (LWP 26310)]
[New Thread 0x7fffdf7fd700 (LWP 26311)]
Ready to accept KISS client application on port 8001 ...
[New Thread 0x7fffdeffc700 (LWP 26312)]

Thread 1 "direwolf" received signal SIGSEGV, Segmentation fault.
0x00000000004473d4 in strlcpy_debug (dst=dst@entry=0x825bc0 <pt_slave_name> "", src=0xfffffffff7184280 <error: Cannot access memory at address 0xfffffffff7184280>,
    siz=siz@entry=32, file=file@entry=0x45d97d "kiss.c", func=func@entry=0x45da48 <__func__.5056> "kiss_open_pt", line=line@entry=382) at misc/strlcpy.c:95
95                              if ((*d++ = *s++) == 0)
(gdb) backtrace
#0  0x00000000004473d4 in strlcpy_debug (dst=dst@entry=0x825bc0 <pt_slave_name> "", src=0xfffffffff7184280 <error: Cannot access memory at address 0xfffffffff7184280>,
    siz=siz@entry=32, file=file@entry=0x45d97d "kiss.c", func=func@entry=0x45da48 <__func__.5056> "kiss_open_pt", line=line@entry=382) at misc/strlcpy.c:95
#1  0x000000000042d09e in kiss_open_pt () at kiss.c:382
#2  kiss_init (mc=mc@entry=0x66d7e0 <misc_config>) at kiss.c:278
#3  0x00000000004045fc in main (argc=4, argv=0x7fffffffe848) at direwolf.c:724
(gdb) quit
A debugging session is active.

        Inferior 1 [process 26300] will be killed.

Quit anyway? (y or n) y
Ξ ~git/direwolf git:(dev) ▶

I'm not getting much more out of this than what I was told by the fact that it was a segfault, as I'm not really a dev myself.

[virtualdxs]

Also, is there a config option to make -t 0 the default? LXTerminal doesn't show any of the text besides the green text so I have alias direwolf='direwolf -t 0 but it would be nicer to have that as a config option.

[dranch]

Ok.. thanks for the BT. As part of the troubleshooting, please configure Direwolf to use a real ALSA device and NOT use default. Please see the User Guide .pdf on how to identify your proper audio device. Also try running Direwolf as root just to see if it will run under the root user vs. a standard user.

[virtualdxs]

Didn't realize there was a direwolf.conf in the root of the git repo. That's why it did the default again.

Ξ ~git/direwolf git:(dev) ▶ gdb ./direwolf
GNU gdb (GDB) 7.11.1
Copyright (C) 2016 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-pc-linux-gnu".
Type "show configuration" for configuration details.
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Find the GDB manual and other documentation resources online at:
<http://www.gnu.org/software/gdb/documentation/>.
For help, type "help".
Type "apropos word" to search for commands related to "word"...
Reading symbols from ./direwolf...done.
(gdb) run -t 0 -p
Starting program: /var/git/direwolf/direwolf -t 0 -p
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/usr/lib/libthread_db.so.1".
Dire Wolf DEVELOPMENT version 1.4 C (Oct 30 2016)
Includes optional support for:  gpsd

Reading config file /home/dxs/direwolf.conf
Audio device for both receive and transmit: plughw:1,0  (channel 0)
Channel 0: 1200 baud, AFSK 1200 & 2200 Hz, E+, 44100 sample rate.
Note: PTT not configured for channel 0. (Ignore this if using VOX.)
[New Thread 0x7ffff5458700 (LWP 2502)]
[New Thread 0x7ffff4c57700 (LWP 2503)]
Ready to accept AGW client application 0 on port 8000 ...
[New Thread 0x7ffff4456700 (LWP 2504)]
[New Thread 0x7ffff3c55700 (LWP 2505)]
[New Thread 0x7ffff3454700 (LWP 2506)]
[New Thread 0x7ffff2c53700 (LWP 2507)]
Ready to accept KISS client application on port 8001 ...
[New Thread 0x7ffff2452700 (LWP 2508)]

Thread 1 "direwolf" received signal SIGSEGV, Segmentation fault.
0x00000000004473d4 in strlcpy_debug (dst=dst@entry=0x825bc0 <pt_slave_name> "", src=0xfffffffff7184280 <error: Cannot access memory at address 0xfffffffff7184280>,
    siz=siz@entry=32, file=file@entry=0x45d97d "kiss.c", func=func@entry=0x45da48 <__func__.5056> "kiss_open_pt", line=line@entry=382) at misc/strlcpy.c:95
95                              if ((*d++ = *s++) == 0)
(gdb) backtrace
#0  0x00000000004473d4 in strlcpy_debug (dst=dst@entry=0x825bc0 <pt_slave_name> "", src=0xfffffffff7184280 <error: Cannot access memory at address 0xfffffffff7184280>,
    siz=siz@entry=32, file=file@entry=0x45d97d "kiss.c", func=func@entry=0x45da48 <__func__.5056> "kiss_open_pt", line=line@entry=382) at misc/strlcpy.c:95
#1  0x000000000042d09e in kiss_open_pt () at kiss.c:382
#2  kiss_init (mc=mc@entry=0x66d7e0 <misc_config>) at kiss.c:278
#3  0x00000000004045fc in main (argc=4, argv=0x7fffffffe848) at direwolf.c:724
(gdb) quit
A debugging session is active.

        Inferior 1 [process 2498] will be killed.

Quit anyway? (y or n) y
Ξ ~git/direwolf git:(dev) ▶

Still segfaults as root.

[virtualdxs]

For the record SELinux is not enabled, so it's not a permissions issue.