221143 – REGRESSION (r272039): [Big Sur release WK2] imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html is a flaky crash

Bug 221143 - REGRESSION (r272039): [Big Sur release WK2] imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html is a flaky crash

Summary: REGRESSION (r272039): [Big Sur release WK2] imported/w3c/web-platform-tests/m...

Status:	NEW

Alias:	None

Product:	WebKit
Classification:	Unclassified
Component:	Media (show other bugs)
Version:	WebKit Nightly Build
Hardware:	Unspecified Unspecified

Importance:	P2 Normal
Assignee:	Peng Liu

URL:
Keywords:	InRadar

Depends on:
Blocks:

Reported:	2021-01-29 11:05 PST by Robert Jenner
Modified:	2021-04-09 14:32 PDT (History)
CC List:	4 users (show)

See Also:	220964

Attachments
crash log (158.99 KB, text/plain) 2021-01-29 16:10 PST, Ryan Haddad	no flags	Details
View All Add an attachment (proposed patch, testcase, etc.)

Note You need to log in before you can comment on or make changes to this bug.

Description Robert Jenner 2021-01-29 11:05:09 PST

imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html

Test is crashing in Big Sur release WK2.

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fmedia-source%2Fmediasource-changetype-play-implicit.html

CRASH LOG URL:
https://build.webkit.org/results/Apple-BigSur-Release-WK2-Tests/r272060%20(1267)/imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit-crash-log.txt

Comment 1 Radar WebKit Bug Importer 2021-01-29 11:05:45 PST

<rdar://problem/73762731>

Comment 2 Robert Jenner 2021-01-29 11:12:26 PST

Bug/Crash reproducible in r272602

Produced bug using test:

run-webkit-test imported/w3c/web-platform-tests/media-source/mediasource-changetype-play-implicit.html --iterations 1000 -f

Regress found crash not occurring in r272035, and started occurring in r272039 

It appears the crashing was introduced in r272039 .

Comment 3 Radar WebKit Bug Importer 2021-01-29 11:12:36 PST

<rdar://problem/73763073>

Comment 4 Ryan Haddad 2021-01-29 16:10:47 PST

Created attachment 418782 [details]
crash log

Thread 34 Crashed:: Dispatch queue: SourceBufferPrivateAVFObjC data parser queue
0   libwebrtc.dylib               	0x000000077d5e14a1 webm::WebmParser::DocumentParser::Feed(webm::Callback*, webm::Reader*) + 625 (webm_parser.cc:166)
1   libwebrtc.dylib               	0x000000077d5e1224 webm::WebmParser::Feed(webm::Callback*, webm::Reader*) + 36 (webm_parser.cc:271)
2   com.apple.WebCore             	0x00000007798013b9 WebCore::SourceBufferParserWebM::appendData(WebCore::SourceBufferParser::Segment&&, WTF::CompletionHandler<void ()>&&, WebCore::SourceBufferParser::AppendFlags) + 537 (SourceBufferParserWebM.cpp:627)
3   com.apple.WebCore             	0x000000077817c94a operator() + 72 (SourceBufferPrivateAVFObjC.mm:600) [inlined]
4   com.apple.WebCore             	0x000000077817c94a invocation function for block in WebCore::SourceBufferPrivateAVFObjC::append(WTF::Vector<unsigned char, 0ul, WTF::CrashOnOverflow, 16ul, WTF::FastMalloc>&&) + 106 (SourceBufferPrivateAVFObjC.mm:599)
5   libdispatch.dylib             	0x00007fff201ac5dd _dispatch_call_block_and_release + 12
6   libdispatch.dylib             	0x00007fff201ad7c7 _dispatch_client_callout + 8
7   libdispatch.dylib             	0x00007fff201b0195 _dispatch_continuation_pop + 423
8   libdispatch.dylib             	0x00007fff201af868 _dispatch_async_redirect_invoke + 713
9   libdispatch.dylib             	0x00007fff201bc857 _dispatch_root_queue_drain + 326
10  libdispatch.dylib             	0x00007fff201bcfb8 _dispatch_worker_thread2 + 92
11  libsystem_pthread.dylib       	0x00007fff20355453 _pthread_wqthread + 244
12  libsystem_pthread.dylib       	0x00007fff20354467 start_wqthread + 15