OpenWebRTC iOS random crash gstglcontext
Question
I am working on a WebRTC project. I chose OpenWebRTC to implement in my project.
I have made it to work for both web and iOS. I developed a signaling server in asp.net MVC and used coTurn server as a turn server.
Everything is working fine except for one issue.
The iOS app crashes randomly with the exception
EXC_BAD_ACCESS exception:(gstglcontext(14):EXC_BAD_ACCESS (code=1,address=0x30))
The exception is thrown from somewhere within the SDK. I have been trying for days now to find a solution, but have not succeeded so far.
Has anyone else faced a similar problem?
Following is the stack trace from the device logs of the crash
Incident Identifier: FA4FC9DB-B4CA-497E-9A25-639A4F743BC8
CrashReporter Key: ff7120b6353817347fd122932620c25469ace55e
Hardware Model: iPad4,5
Process: NativeDemo [983]
Path: /private/var/containers/Bundle/Application/13129A20-974B-405C-AB44-B5F8526AF362/NativeDemo.app/NativeDemo
Identifier: com.ericsson.research.owr.NativeDemo
Version: 1 (1.0)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.ericsson.research.owr.NativeDemo [1284]
Date/Time: 2017-03-22 04:52:45.7874 -0700
Launch Time: 2017-03-22 04:26:17.7434 -0700
OS Version: iPhone OS 10.2.1 (14D27)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000030
Termination Signal: Segmentation fault: 11
Termination Reason: Namespace SIGNAL, Code 0xb
Terminating Process: exc handler [0]
Triggered by Thread: 9
Filtered syslog:
None found
Thread 0 name: Dispatch queue: com.apple.main-thread
Thread 0:
0 libsystem_kernel.dylib 0x000000018d3a1188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x000000018d3a0ff8 mach_msg + 72
2 CoreFoundation 0x000000018e39e5d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018e39c1ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018e2ca2b8 CFRunLoopRunSpecific + 444
5 GraphicsServices 0x000000018fd7e198 GSEventRunModal + 180
6 UIKit 0x000000019430a7fc -[UIApplication _run] + 684
7 UIKit 0x0000000194305534 UIApplicationMain + 208
8 NativeDemo 0x0000000100050e90 0x100040000 + 69264
9 libdyld.dylib 0x000000018d2ad5b8 start + 4
Thread 1 name: owr_main_loop
Thread 1:
0 libsystem_kernel.dylib 0x000000018d3a56e4 poll + 8
1 NativeDemo 0x000000010031d8c0 0x100040000 + 3004608
2 NativeDemo 0x000000010031dc18 0x100040000 + 3005464
3 NativeDemo 0x000000010059794c 0x100040000 + 5601612
4 NativeDemo 0x0000000100597a88 0x100040000 + 5601928
5 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
6 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
7 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
8 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 2 name: AVAudioSession Notify Thread
Thread 2:
0 libsystem_kernel.dylib 0x000000018d3a1188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x000000018d3a0ff8 mach_msg + 72
2 CoreFoundation 0x000000018e39e5d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018e39c1ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018e2ca2b8 CFRunLoopRunSpecific + 444
5 AVFAudio 0x00000001a7867d24 GenericRunLoopThread::Entry(void*) + 164
6 AVFAudio 0x00000001a788dd9c CAPThread::Entry(CAPThread*) + 84
7 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
8 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
9 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 3 name: com.apple.uikit.eventfetch-thread
Thread 3:
0 libsystem_kernel.dylib 0x000000018d3a1188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x000000018d3a0ff8 mach_msg + 72
2 CoreFoundation 0x000000018e39e5d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018e39c1ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018e2ca2b8 CFRunLoopRunSpecific + 444
5 Foundation 0x000000018ee0726c -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 304
6 Foundation 0x000000018ee27dd0 -[NSRunLoop(NSRunLoop) runUntilDate:] + 96
7 UIKit 0x0000000194c7ec38 -[UIEventFetcher threadMain] + 136
8 Foundation 0x000000018ef04e68 __NSThread__start__ + 1024
9 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
10 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
11 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 4 name: com.apple.NSURLConnectionLoader
Thread 4:
0 libsystem_kernel.dylib 0x000000018d3a1188 mach_msg_trap + 8
1 libsystem_kernel.dylib 0x000000018d3a0ff8 mach_msg + 72
2 CoreFoundation 0x000000018e39e5d0 __CFRunLoopServiceMachPort + 192
3 CoreFoundation 0x000000018e39c1ec __CFRunLoopRun + 1132
4 CoreFoundation 0x000000018e2ca2b8 CFRunLoopRunSpecific + 444
5 CFNetwork 0x000000018eacfa70 +[NSURLConnection(Loader) _resourceLoadLoop:] + 336
6 Foundation 0x000000018ef04e68 __NSThread__start__ + 1024
7 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
8 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
9 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 5 name: gmain
Thread 5:
0 libsystem_kernel.dylib 0x000000018d3a56e4 poll + 8
1 NativeDemo 0x000000010031d8c0 0x100040000 + 3004608
2 NativeDemo 0x000000010031d994 0x100040000 + 3004820
3 NativeDemo 0x000000010031ecec 0x100040000 + 3009772
4 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
5 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
6 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
7 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 6 name: video-source:src
Thread 6:
0 libsystem_kernel.dylib 0x000000018d3bee1c __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x000000018d4849f4 _pthread_cond_wait + 692
2 Foundation 0x000000018ee11f28 -[NSCondition waitUntilDate:] + 340
3 Foundation 0x000000018ee0ef24 -[NSConditionLock lockWhenCondition:beforeDate:] + 256
4 NativeDemo 0x0000000100070894 0x100040000 + 198804
5 NativeDemo 0x0000000100071b44 0x100040000 + 203588
6 NativeDemo 0x000000010040ce74 0x100040000 + 3985012
7 NativeDemo 0x000000010040c678 0x100040000 + 3982968
8 NativeDemo 0x00000001004886a8 0x100040000 + 4490920
9 NativeDemo 0x0000000100303e24 0x100040000 + 2899492
10 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
11 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
12 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
13 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 7 name: sink-queue-0:src
Thread 7:
0 libsystem_kernel.dylib 0x000000018d3bee1c __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x000000018d4849c0 _pthread_cond_wait + 640
2 NativeDemo 0x000000010036a1d0 0x100040000 + 3318224
3 NativeDemo 0x0000000100099c40 0x100040000 + 367680
4 NativeDemo 0x00000001004886a8 0x100040000 + 4490920
5 NativeDemo 0x0000000100303e24 0x100040000 + 2899492
6 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
7 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
8 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
9 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 8 name: gstglnavigation
Thread 8:
0 libsystem_kernel.dylib 0x000000018d3a56e4 poll + 8
1 NativeDemo 0x000000010031d8c0 0x100040000 + 3004608
2 NativeDemo 0x000000010031dc18 0x100040000 + 3005464
3 NativeDemo 0x000000010043ba28 0x100040000 + 4176424
4 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
5 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
6 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
7 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 9 name: gstglcontext
Thread 9 Crashed:
0 IOAccelerator 0x000000019097ecbc IOAccelResourceGetResidentDataSize + 0
1 AGXGLDriver 0x00000001a2901390 0x1a289a000 + 422800
2 AGXGLDriver 0x00000001a28c1354 0x1a289a000 + 160596
3 AGXGLDriver 0x00000001a28c14bc 0x1a289a000 + 160956
4 AGXGLDriver 0x00000001a28bee38 0x1a289a000 + 151096
5 GLEngine 0x00000001a303b81c glClear_Exec + 432
6 NativeDemo 0x00000001000d3340 0x100040000 + 602944
7 NativeDemo 0x000000010043f8a8 0x100040000 + 4192424
8 NativeDemo 0x000000010043ccb8 0x100040000 + 4181176
9 NativeDemo 0x000000010043ccf8 0x100040000 + 4181240
10 NativeDemo 0x000000010031d5e4 0x100040000 + 3003876
11 NativeDemo 0x000000010031d924 0x100040000 + 3004708
12 NativeDemo 0x000000010031dc18 0x100040000 + 3005464
13 NativeDemo 0x0000000100437f48 0x100040000 + 4161352
14 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
15 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
16 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
17 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
Thread 10 name: source-output-queue-0:src
Thread 10:
0 libsystem_kernel.dylib 0x000000018d3bee1c __psynch_cvwait + 8
1 libsystem_pthread.dylib 0x000000018d4849c0 _pthread_cond_wait + 640
2 NativeDemo 0x000000010036a1d0 0x100040000 + 3318224
3 NativeDemo 0x000000010043ca84 0x100040000 + 4180612
4 NativeDemo 0x000000010043bde4 0x100040000 + 4177380
5 NativeDemo 0x00000001000d417c 0x100040000 + 606588
6 NativeDemo 0x00000001000d2540 0x100040000 + 599360
7 NativeDemo 0x0000000100403f48 0x100040000 + 3948360
8 NativeDemo 0x0000000100407524 0x100040000 + 3962148
9 NativeDemo 0x0000000100472894 0x100040000 + 4401300
10 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
11 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
12 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
13 NativeDemo 0x0000000100472894 0x100040000 + 4401300
14 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
15 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
16 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
17 NativeDemo 0x0000000100472894 0x100040000 + 4401300
18 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
19 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
20 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
21 NativeDemo 0x0000000100472894 0x100040000 + 4401300
22 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
23 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
24 NativeDemo 0x000000010049b000 0x100040000 + 4567040
25 NativeDemo 0x0000000100472894 0x100040000 + 4401300
26 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
27 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
28 NativeDemo 0x000000010049b000 0x100040000 + 4567040
29 NativeDemo 0x0000000100472894 0x100040000 + 4401300
30 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
31 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
32 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
33 NativeDemo 0x0000000100472894 0x100040000 + 4401300
34 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
35 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
36 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
37 NativeDemo 0x0000000100472894 0x100040000 + 4401300
38 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
39 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
40 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
41 NativeDemo 0x0000000100472894 0x100040000 + 4401300
42 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
43 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
44 NativeDemo 0x000000010049b000 0x100040000 + 4567040
45 NativeDemo 0x0000000100472894 0x100040000 + 4401300
46 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
47 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
48 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
49 NativeDemo 0x0000000100472894 0x100040000 + 4401300
50 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
51 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
52 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
53 NativeDemo 0x0000000100472894 0x100040000 + 4401300
54 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
55 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
56 NativeDemo 0x00000001003f78e4 0x100040000 + 3897572
57 NativeDemo 0x0000000100472894 0x100040000 + 4401300
58 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
59 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
60 NativeDemo 0x000000010049b000 0x100040000 + 4567040
61 NativeDemo 0x0000000100472894 0x100040000 + 4401300
62 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
63 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
64 NativeDemo 0x000000010049b000 0x100040000 + 4567040
65 NativeDemo 0x0000000100472894 0x100040000 + 4401300
66 NativeDemo 0x00000001004732b8 0x100040000 + 4403896
67 NativeDemo 0x00000001004730f4 0x100040000 + 4403444
68 NativeDemo 0x000000010009a014 0x100040000 + 368660
69 NativeDemo 0x00000001004886a8 0x100040000 + 4490920
70 NativeDemo 0x0000000100303e24 0x100040000 + 2899492
71 NativeDemo 0x0000000100307d90 0x100040000 + 2915728
72 libsystem_pthread.dylib 0x000000018d485850 _pthread_body + 240
73 libsystem_pthread.dylib 0x000000018d485760 _pthread_body + 0
74 libsystem_pthread.dylib 0x000000018d482d94 thread_start + 4
I further tracked down the issue.
The exception is thrown on the following line in gstglimagesink.c in the function 'gst_glimage_sink_on_draw'
gl->Clear (GL_COLOR_BUFFER_BIT);
2 answers
solution1
5 ACCPTED 2017-04-03 05:33:35
Update the gstreamer library to version 1.10.4. The newer version of gstreamer has fixed this bug. To update modify the script 'update-gst.sh' as below master_commit= git ls-remote git://anongit.freedesktop.org/git/gstreamer/$i | grep "1.10.4$" | awk '{print $1}' git ls-remote git://anongit.freedesktop.org/git/gstreamer/$i | grep "1.10.4$" | awk '{print $1}'
Then run the script, after that do a clean build for os x first and then iOS.
solution2
3 2017-03-29 11:04:54
gl->Clear (GL_COLOR_BUFFER_BIT);
At that line gl is a virtual conversion table of type GstGLFuncs . GstGLFuncs is a member of type struct GstGLContext which contains user's data.
So clearly, you don't have the user's data which you are trying to access. You are having a Dangling pointer . This could be because
- The pointer(in your case
GstGLContext) used to point to memory that was ok, but its chunk was deallocated. - The pointer is corrupt.
The line of code that your app crashes on is not the root cause of the problem. The problem in #1 is whatever line of code caused the premature deallocation, and the problem in #2 is whatever line of code corrupted the pointer.
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