BUG: Segmentation fault

Calling motion with a netcam I get a segmentation fault. In the standard motion.conf I only put a ";" in front of the "videodevice" And "tunerdevice" and add the address of the webcam and username/password Using Sitecom wireless IP camera

Test case

Output of the debugger:
--------------------------------------------------
Starting program: /download/motion-3.1.18/motion 
[Thread debugging using libthread_db enabled]
[New Thread 1078699904 (LWP 25287)]

Processing thread 0 - config file /etc//motion.conf
Thread0 device: 192.168.0.8:81/image.jpg input: -1
Netcam: thread 0: starting...
[New Thread 1080802224 (LWP 25290)]
Netcam: jpeg file
Netcam: thread 0: thread PID: 25287
[New Thread 1082903472 (LWP 25291)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1080802224 (LWP 25290)]
0x40140ee7 in _int_malloc () from /lib/tls/libc.so.6
(gdb) 
----------------------------------------------------------

Telnet session:

telnet 192.168.0.8  81
Trying 192.168.0.8...
Connected to 192.168.0.8.
Escape character is '^]'.
GET /image.jpg HTTP/1.0
Authorization: Basic aG9sc2NoOmhvbHNjaDk5

HTTP/1.0 200 OK
Server: Camera Web Server/1.0
Auther: Steven Wu
MIME-version: 1.0
Cache-Control: no-cache
Content-Type:image/jpeg
Content-Length:61162

VVL00;






##J1*1JJJJJJJJJJJJJJJJJJJJJJJJJJ
<.... Deleted binary data from JPG picture ....>
Connection closed by foreign host.

Environment

Motion version:	motion-3.1.18 snap 9
Shared libraries:	mysql
Server OS:	SuSe 9.1 , kernel 2.6.5-7.111.19-default

-- TWikiGuest - 10 Jan 2005

Follow up

• What patch version are you using ?
• What are exactly the netcam_url and netcam_userpass ?

Please could you do a bt full to get the stack trace ? (if is possible go to frame , i.ex: frame #2 , where the segfault happens )

-- AngelCarpintero - 10 Jan 2005

---

• What patch version are you using ?

I use motion-3.1.18 snap 9 or what else do you mean ?

• What are exactly the netcam_url and netcam_userpass ?

netcam_url 192.168.0.8:81/image.jpg netcam_userpass holsch:holsch99

• Please could you do a bt full to get the stack trace ? (if is possible go to frame , i.ex: frame #2 , where the segfault happens )

I'am not the linux crack, but lets see if the following log is what you are searching for:

-----------------

GNU DDD 3.3.8 (i386-suse-linux-gnu), by Dorothea LUsing host libthread_db library
"/lib/tls/libthread_db.so.1".
(gdb) run
Starting program: /download/motion-3.1.18/motion 
[Thread debugging using libthread_db enabled]
[New Thread 1078699904 (LWP 12324)]
Processing thread 0 - config file /etc//motion.conf
Thread0 device: 192.168.0.8:81/image.jpg input: -1
[New Thread 1080802224 (LWP 12327)]
Netcam: thread 0: starting...
Netcam: jpeg file
Netcam: thread 0: thread PID: 12324
[New Thread 1082903472 (LWP 12328)]

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1082903472 (LWP 12328)]
header_get (rbuf=0x0, hdr=0x408bca48, flags=1) at netcam_wget.c:125
/download/motion-3.1.18/netcam_wget.c:125:4153:beg:0x8054db3
(gdb) bt full
#0  header_get (rbuf=0x0, hdr=0x408bca48, flags=1) at netcam_wget.c:125
   res = Variable "res" is not available.
(gdb) frame 2
#2  0x08054488 in netcam_single_read (netcam=0x805f300) at netcam.c:556
/download/motion-3.1.18/netcam.c:556:13889:beg:0x8054488
(gdb) bt full
#0  header_get (rbuf=0x0, hdr=0x408bca48, flags=1) at netcam_wget.c:125
   res = Variable "res" is not available.
(gdb)

If a remote debugging can be helpful for you, you can reach the web cam by: holsch.dnsalias.net:81/image.jpg login and pw see above

-- -- TWikiGuest - 10 Jan 2005

---

• What patch version are you using ?

I use motion-3.1.18 snap 9 or what else do you mean ?

I mean that there was 2 patches against snap9 , you can find the last one here

• What network camera are you trying to connect ?

Thanks for the information , i'll try to debug remotely.

-- AngelCarpintero - 11 Jan 2005

---

Not a big different, just one additional line output then the same fault. Just to be sure that I use the same source: I've installed: motion-3.1.18_snap9.tar.gz and path it with motion-3.1.18_snap9-netcam-pre2.diff.gz

Here is the result from gdb:

Starting program: /download/motion-3.1.18/motion 
[Thread debugging using libthread_db enabled]
[New Thread 1078699904 (LWP 7600)]
Processing thread 0 - config file /etc//motion.conf
Thread0 device: 192.168.0.8:81/image.jpg input: -1
Netcam: thread 0: starting...
[New Thread 1080802224 (LWP 7603)]
[HTTP/1.0 200 OK]
Netcam: jpeg file
Netcam: thread 0: thread PID: 7600
[New Thread 1082903472 (LWP 7604)]
Thread exiting

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 1078699904 (LWP 7600)]
0x40140208 in _int_free () from /lib/tls/libc.so.6
(gdb) 

-- TWikiGuest - 11 Jan 2005

Fix record

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

-- AngelCarpintero - 11 Jan 2005