Motion - Bug Report 2005x 01x 10x 095715

BUG: Crash when using a netcam configuration

The configuration is working with motion version 3.1.17 but the crash occurs in the version 3.1.18.
The behaviour of motion is a little bit strange: if a set a breakpoint of netcam_connect I can see the the thread 0 is created but just after a second thread is created and causes a crash.
Can you reproduce the problem? If not I need some support to investigate this problem. In the testcase there is an output of GDB.

Test case

(gdb) b netcam_connect
Breakpoint 1 at 0x8055c28: file netcam.c, line 342.
(gdb) r
Starting program: /home/sfri/UNISON/MOTION/HTTPTEST/motion-3.1.18/motion
[Thread debugging using libthread_db enabled]
[New Thread 16384 (LWP 4758)]
Processing thread 0 - config file /home/sfri/.motion/motion.conf
Thread0 device: http://localhost/motion.jpg input: -1
[New Thread 32769 (LWP 4759)]
[New Thread 16386 (LWP 4760)]
Netcam: thread 0: starting...
[Switching to Thread 16386 (LWP 4760)]

Breakpoint 1, netcam_connect (netcam=0x8063930) at netcam.c:342
warning: Source file is more recent than executable.

342             sock = socket(PF_INET, SOCK_STREAM, 0);
(gdb) bt
#0  netcam_connect (netcam=0x8063930) at netcam.c:342
#1  0x08056929 in netcam_start (cnt=0x8060a40) at netcam.c:671
#2  0x08050291 in vid_start (cnt=0x8060a40) at video.c:568
#3  0x0804ae8f in motion_loop (arg=0x8060a40) at motion.c:355
#4  0x40049e51 in pthread_start_thread () from /lib/libpthread.so.0
#5  0x40049ecf in pthread_start_thread_event () from /lib/libpthread.so.0
#6  0x401db6ea in clone () from /lib/libc.so.6
(gdb) c
Continuing.
Netcam: jpeg file

Breakpoint 1, netcam_connect (netcam=0x8063930) at netcam.c:342
342             sock = socket(PF_INET, SOCK_STREAM, 0);
(gdb) bt
#0  netcam_connect (netcam=0x8063930) at netcam.c:342
#1  0x08056494 in netcam_single_read (netcam=0x8063930) at netcam.c:556
#2  0x0805697d in netcam_start (cnt=0x8060a40) at netcam.c:679
#3  0x08050291 in vid_start (cnt=0x8060a40) at video.c:568
#4  0x0804ae8f in motion_loop (arg=0x8060a40) at motion.c:355
#5  0x40049e51 in pthread_start_thread () from /lib/libpthread.so.0
#6  0x40049ecf in pthread_start_thread_event () from /lib/libpthread.so.0
#7  0x401db6ea in clone () from /lib/libc.so.6
(gdb) c
Continuing.
[New Thread 32771 (LWP 4763)]
Netcam: thread 0: thread PID: 4763
[Switching to Thread 32771 (LWP 4763)]

Breakpoint 1, netcam_connect (netcam=0x8063930) at netcam.c:342
342             sock = socket(PF_INET, SOCK_STREAM, 0);
(gdb) bt
#0  netcam_connect (netcam=0x8063930) at netcam.c:342
#1  0x08056494 in netcam_single_read (netcam=0x8063930) at netcam.c:556
#2  0x080559aa in netcam_loop (arg=0x8060a40) at netcam.c:254
#3  0x40049e51 in pthread_start_thread () from /lib/libpthread.so.0
#4  0x40049ecf in pthread_start_thread_event () from /lib/libpthread.so.0
#5  0x401db6ea in clone () from /lib/libc.so.6
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x401d9814 in tsearch () from /lib/libc.so.6
(gdb) bt
#0  0x401d9814 in tsearch () from /lib/libc.so.6
#1  0x401eb10d in __nss_lookup_function () from /lib/libc.so.6
#2  0x401eaf43 in __nss_next () from /lib/libc.so.6
#3  0x401eea1f in gethostbyname_r () from /lib/libc.so.6
#4  0x401ee366 in gethostbyname () from /lib/libc.so.6
#5  0x08055ca2 in netcam_connect (netcam=0x8063930) at netcam.c:350
#6  0x08056494 in netcam_single_read (netcam=0x8063930) at netcam.c:556
#7  0x080559aa in netcam_loop (arg=0x8060a40) at netcam.c:254
#8  0x40049e51 in pthread_start_thread () from /lib/libpthread.so.0
#9  0x40049ecf in pthread_start_thread_event () from /lib/libpthread.so.0
#10 0x401db6ea in clone () from /lib/libc.so.6
(gdb)

Environment

Motion version: 3.1.18snap9
Shared libraries: curl, xmlrpc, ffmpeg, mysql, postgresql
Server OS: Debian SID

-- SebastienFricker - 10 Jan 2005

Follow up

First , curl is not needed with snap9 because StreamingNetcamWithoutCurl replaces it. What is your network camera ? ( strange that is pointing to localhost wink unless you are trying to emulate it).

Moreover the current patch needs to specify netcam_url and netcam_userpass.

A new patch is comming with many bug fixed.

-- AngelCarpintero - 10 Jan 2005

NetCam config

In fact I does not use a netcam. I simulate a netcam using apache.

netcam_url is set to http://localhost/motion.jpg and netcam_userpass is correctly set to the htuser/htpassword.

How can I disable curl? Is this parameter in the motion.conf file or does I need to enter a special option for ./configure command?

Follow up

You don't need to do anything with curl , motion just doesn't need it anymore and configure doesn't check for it.

I was not able to reproduce your problem setting apache/static image
 
netcam_url http://localhost/motion.jpg
netcam_userpass motion:motion

where motion:motion are htuser/htpassword .

Investigation

I will investigate on it, I think that the problem is caused by the second thread which should not be created.

Sebastien: sorry but I was not able to find the problem. The only think I could see is that the stack was corrupted.

-- AngelCarpintero - 10 Jan 2005

Fix record

Fixed with netcam-pre2 patch . Please reopen the bug if the problem remains.

-- AngelCarpintero - 14 Jan 2005
Topic revision: r10 - 30 Jan 2005, KennethLavrsen
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