Bug 51780 – video tag: crashes on random seek and reload of video

• Component: Media
• Status: UNCONFIRMED

[Alex Zhukov]

Created attachment 77723 [details]
html+script to reproduce the bug

Overview:
WebKit (both nightly build r74228 and Safari 5.0.3) crashes when reloading and/or seeking within video.

Steps to Reproduce:
attached reloadvideo.html html+script reproduces the crash after five 1-5 minutes of reloading.
1. find long enough (large enough) video (the longer the duration the faster bug reproduces) (i test on apple IOS training videos (e.g. 1-09 Fundamentals of Cocoa Session from WWDC.m4v 336MB)
2. make sure your http server support Content-Range headers
3. make sure it takes notable time to download movie into the browser (i use uranged bandwidth limited http server http://code.google.com/p/uranged/)
4. open reloadvideo.html, you may want to edit it first to change video url to your video
4.1 click "Random Reload" 
4.2 click "Random Seek"
5. wait up to 5 minutes
6. crash

Actual Results:
After restarting crashed browser functionality does not restore completely. Seek to the middle of the movie is not supported. 
User-Agent string changes from "Apple Mac OS X v10.6.5 CoreMedia v1.0.0.10H574" to "QuickTime/7.6.6 (qtver=7.6.6;cpu=IA32;os=Mac 10.6.5)"

Expected Results:
No crash
Full functionality restored after restarting the application.

Build Date & Platform: WebKit r74228 Mac OS X 10.6.5

[Alex Zhukov]

Created attachment 77724 [details]
crash log

crash stack trace for your convenience:
Thread 8 Crashed:
0   com.apple.CoreFoundation      	0x00007fff842467fe CFRunLoopCopyCurrentMode + 46
1   com.apple.CoreFoundation      	0x00007fff8427adf6 _wakeUpRunLoop + 278
2   com.apple.CoreFoundation      	0x00007fff8427a100 _CFStreamSignalEvent + 448
3   com.apple.CFNetwork           	0x00007fff827c6876 HTTPNetConnection::responseStreamCallback(void*, __CFReadStream*, unsigned long) + 508
4   com.apple.CFNetwork           	0x00007fff827c6611 NetConnection::connectionResponse(__CFReadStream*, unsigned long) + 93
5   com.apple.CoreFoundation      	0x00007fff8427a373 _signalEventSync + 115
6   com.apple.CoreFoundation      	0x00007fff8427a2e4 _cfstream_solo_signalEventSync + 116
7   com.apple.CoreFoundation      	0x00007fff8427a224 _CFStreamSignalEvent + 740
8   com.apple.CFNetwork           	0x00007fff827c599c HTTPReadFilter::socketReadStreamCallback(unsigned long) + 288
9   com.apple.CFNetwork           	0x00007fff827c5867 HTTPReadFilter::_httpRdFilterStreamCallBack(__CFReadStream*, unsigned long, void*) + 49
10  com.apple.CoreFoundation      	0x00007fff8427a373 _signalEventSync + 115
11  com.apple.CoreFoundation      	0x00007fff8427a2e4 _cfstream_solo_signalEventSync + 116
12  com.apple.CoreFoundation      	0x00007fff8421a401 __CFRunLoopDoSources0 + 1361
13  com.apple.CoreFoundation      	0x00007fff842185f9 __CFRunLoopRun + 873
14  com.apple.CoreFoundation      	0x00007fff84217dbf CFRunLoopRunSpecific + 575
15  com.apple.CoreFoundation      	0x00007fff84217b46 CFRunLoopRun + 70
16  com.apple.CoreMedia           	0x00007fff890b855f FigThreadGlobalNetworkBufferingRunloop + 119
17  libSystem.B.dylib             	0x00007fff856f8536 _pthread_start + 331
18  libSystem.B.dylib             	0x00007fff856f83e9 thread_start + 13

[Eric Carlson]

<rdar://problem/7544102>