motion crashes when using two threads

[Thiago Figueiro]

Binary package hint: motion

When running motion with 2 webcams it crashes after a while.
thiago@haoni:~/Desktop/motion$ gdb --args motion -c motion.conf

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7fe3b70 (LWP 17065)]
0x00d3dc1c in ?? () from /lib/tls/i686/cmov/libc.so.6
(gdb) bt
#0 0x00d3dc1c in ?? () from /lib/tls/i686/cmov/libc.so.6
#1 0x00d40ecd in free () from /lib/tls/i686/cmov/libc.so.6
#2 0x0804cb08 in ?? ()
#3 0x0804f1ea in ?? ()
#4 0x0013396e in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5 0x00d9ea4e in clone () from /lib/tls/i686/cmov/libc.so.6

motion.conf:

$ grep -v ^# motion.conf | egrep -v '^$'
daemon off
width 640
height 480
framerate 2
minimum_frame_time 1
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
threshold 1500
threshold_tune off
noise_level 32
noise_tune on
pre_capture 0
post_capture 0
max_mpeg_time 0
output_all on
output_normal off
output_motion off
quality 85
ppm off
ffmpeg_cap_new off
ffmpeg_cap_motion off
ffmpeg_timelapse 0
ffmpeg_timelapse_mode daily
ffmpeg_bps 500000
ffmpeg_variable_bitrate 0
ffmpeg_video_codec mpeg1
ffmpeg_deinterlace off
snapshot_interval 1
locate off
text_right
text_changes off
text_event
text_double off
webcam_port 0
webcam_quality 50
webcam_motion off
webcam_maxrate 1
webcam_localhost on
webcam_limit 0
control_port 0
control_localhost on
control_html_output on
track_type 0
track_auto off
track_motorx 0
track_motory 0
track_maxx 0
track_maxy 0
track_iomojo_id 0
track_step_angle_x 10
track_step_angle_y 10
track_move_wait 10
track_speed 255
track_stepsize 40
quiet on
thread cam0.conf
thread cam1.conf

cam0.conf

thiago@haoni:~/Desktop/motion$ grep -v ^# cam0.conf | egrep -v '^$'
daemon off
setup_mode off
videodevice /dev/video0
width 640
height 480
framerate 30
minimum_frame_time 0
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
threshold 1500
threshold_tune off
noise_level 32
noise_tune on
pre_capture 5
post_capture 5
max_mpeg_time 0
output_all off
output_normal on
output_motion off
quality 85
ppm off
ffmpeg_cap_new on
ffmpeg_cap_motion off
ffmpeg_timelapse 0
ffmpeg_timelapse_mode daily
ffmpeg_bps 500000
ffmpeg_variable_bitrate 0
ffmpeg_video_codec mpeg1
ffmpeg_deinterlace off
snapshot_interval 0
locate off
text_right
text_changes off
text_event
text_double off
jpeg_filename cam0/%v-%Y%m%d%H%M%S-%q
webcam_port 0
webcam_quality 50
webcam_motion off
webcam_maxrate 1
webcam_localhost on
webcam_limit 0
control_port 0
control_localhost on
control_html_output on
track_type 0
track_auto off
track_motorx 0
track_motory 0
track_maxx 0
track_maxy 0
track_iomojo_id 0
track_step_angle_x 10
track_step_angle_y 10
track_move_wait 10
track_speed 255
track_stepsize 40
quiet on

thiago@haoni:~/Desktop/motion$ grep -v ^# cam1.conf | egrep -v '^$'
daemon off
setup_mode off
videodevice /dev/video1
width 640
height 480
framerate 30
minimum_frame_time 0
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
threshold 1500
threshold_tune off
noise_level 32
noise_tune on
pre_capture 5
post_capture 5
max_mpeg_time 0
output_all off
output_normal on
output_motion off
quality 85
ppm off
ffmpeg_cap_new on
ffmpeg_cap_motion off
ffmpeg_timelapse 0
ffmpeg_timelapse_mode daily
ffmpeg_bps 500000
ffmpeg_variable_bitrate 0
ffmpeg_video_codec mpeg1
ffmpeg_deinterlace off
snapshot_interval 0
locate off
text_right
text_changes off
text_event
text_double off
jpeg_filename cam1/%v-%Y%m%d%H%M%S-%q
webcam_port 0
webcam_quality 50
webcam_motion off
webcam_maxrate 1
webcam_localhost on
webcam_limit 0
control_port 0
control_localhost on
control_html_output on
track_type 0
track_auto off
track_motorx 0
track_motory 0
track_maxx 0
track_maxy 0
track_iomojo_id 0
track_step_angle_x 10
track_step_angle_y 10
track_move_wait 10
track_speed 255
track_stepsize 40
quiet on

[Thiago Figueiro (thiagocsf)]

I think something in the config above is making motion crash. With the configuration below motion doesn't seem to crash.

thiago@haoni:~/Desktop/motion$ cat motion.conf
quiet on
output_all off
output_normal off
snapshot_interval 0
thread cam0.conf
thread cam1.conf

thiago@haoni:~/Desktop/motion$ cat cam0.conf
daemon off
setup_mode off
videodevice /dev/video0
width 640
height 480
framerate 2
minimum_frame_time 1
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
output_all on
output_normal on
output_motion off
quality 85
snapshot_interval 0
jpeg_filename cam0/%Y%m%d%H%M%S-%q
quiet on

thiago@haoni:~/Desktop/motion$ cat cam1.conf
daemon off
setup_mode off
videodevice /dev/video1
width 640
height 480
framerate 2
minimum_frame_time 1
auto_brightness off
brightness 0
contrast 0
saturation 0
hue 0
output_all on
output_normal on
output_motion off
quality 85
snapshot_interval 0
jpeg_filename cam1/%Y%m%d%H%M%S-%q
quiet on

[Darren Conway (darren-conway)]

I have a headless Ubuntu server running v10.10 plus 2 cameras.
Motion runs OK from the command line with 2 cameras. It crashes when started as a daemon process.

When run from the command line, it is run as user <me>. When run as a daemon process it is run as user <motion>.
<me> is a member of<motion> group so it shouldn't matter. Motion also runs OK from the command line with <sudo>. I am just pointing this out because it is the only obvious difference between running from the CLI and running a daemon process.

Output from my syslog is below:

Jan 17 23:10:49 alpha motion: [0] Processing thread 0 - config file /etc/motion/motion.conf
Jan 17 23:10:49 alpha motion: [0] Processing config file /etc/motion/trackcam1.conf
Jan 17 23:10:49 alpha motion: [0] Processing config file /etc/motion/trackcam2.conf
Jan 17 23:10:49 alpha motion: [0] Motion 3.2.12 Started
Jan 17 23:10:49 alpha motion: [0] Created process id file /var/run/motion/motion.pid. Process ID is 5440
Jan 17 23:10:49 alpha motion: [0] Motion running as daemon process
Jan 17 23:10:49 alpha motion: [0] ffmpeg LIBAVCODEC_BUILD 3482112 LIBAVFORMAT_BUILD 3478528
Jan 17 23:10:49 alpha motion: [0] Thread 1 is from /etc/motion/trackcam1.conf
Jan 17 23:10:49 alpha motion: [0] Thread 2 is from /etc/motion/trackcam2.conf
Jan 17 23:10:49 alpha motion: [2] Thread 2 started
Jan 17 23:10:49 alpha motion: [2] cap.driver: "uvcvideo"
Jan 17 23:10:49 alpha motion: [2] cap.card: "UVC Camera (046d:0807)"
Jan 17 23:10:49 alpha motion: [2] cap.bus_info: "usb-0000:01:07.0-1"
Jan 17 23:10:49 alpha motion: [2] cap.capabilities=0x04000001
Jan 17 23:10:49 alpha motion: [1] Thread 1 started
Jan 17 23:10:49 alpha motion: [2] - VIDEO_CAPTURE
Jan 17 23:10:49 alpha motion: [2] - STREAMING
Jan 17 23:10:49 alpha motion: [2] Test palette MJPG (960x720)
Jan 17 23:10:49 alpha motion: [2] Adjusting resolution from 960x720 to 800x600.
Jan 17 23:10:49 alpha motion: [2] Using palette MJPG (800x600) bytesperlines 0 sizeimage 62933 colorspace 00000008
Jan 17 23:10:49 alpha motion: [2] found control 0x00980900, "Brightness", range 0,255
Jan 17 23:10:49 alpha motion: [2] #011"Brightness", default 128, current 128
Jan 17 23:10:49 alpha motion: [2] found control 0x00980901, "Contrast", range 0,255
Jan 17 23:10:49 alpha motion: [2] #011"Contrast", default 32, current 32
Jan 17 23:10:49 alpha motion: [2] found control 0x00980902, "Saturation", range 0,255
Jan 17 23:10:49 alpha motion: [2] #011"Saturation", default 31, current 31
Jan 17 23:10:49 alpha motion: [2] found control 0x00980913, "Gain", range 0,255
Jan 17 23:10:49 alpha motion: [2] #011"Gain", default 0, current 48
Jan 17 23:10:49 alpha motion: [2] mmap information:
Jan 17 23:10:49 alpha motion: [2] frames=4
Jan 17 23:10:49 alpha motion: [2] 0 length=62933
Jan 17 23:10:49 alpha motion: [2] 1 length=62933
Jan 17 23:10:49 alpha motion: [2] 2 length=62933
Jan 17 23:10:49 alpha motion: [2] 3 length=62933
Jan 17 23:10:49 alpha motion: [1] cap.driver: "uvcvideo"
Jan 17 23:10:49 alpha motion: [1] cap.card: "UVC Camera (046d:0807)"
Jan 17 23:10:49 alpha motion: [1] cap.bus_info: "usb-0000:01:07.3-2"
Jan 17 23:10:49 alpha motion: ...

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.