Oh, others already noticed...
https://www.daily.co/blog/safari-15-1-bug/
neilyoung
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Filed a bug https://feedbackassistant.apple.com/feedback/9757570
The crashdump points to the encoder:
(can't post all)
Incident Identifier: 3A089DC7-D703-49B8-A82C-1CA5D4D495F1
CrashReporter Key: 4e9fa228fb3a1aacd70bccacf77cda7a60302e68
Hardware Model: iPad11,6
Process: com.apple.WebKit.WebContent [372]
Path: /System/Library/Frameworks/WebKit.framework/XPCServices/com.apple.WebKit.WebContent.xpc/com.apple.WebKit.WebContent
Identifier: com.apple.WebKit.WebContent
Version: 8612 (8612.2.9.0.20)
Code Type: ARM-64 (Native)
Role: Foreground
Parent Process: launchd [1]
Coalition: com.apple.mobilesafari [499]
Date/Time: 2021-11-13 23:51:03.9349 +0100
Launch Time: 2021-11-13 23:49:02.7432 +0100
OS Version: iPhone OS 15.1 (19B74)
Release Type: User
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_INVALID_ADDRESS at 0x0000000000000000
Exception Codes: 0x0000000000000001, 0x0000000000000000
VM Region Info: 0 is not in any region. Bytes before following region: 4366024704
REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL
UNUSED SPACE AT START
--->
__TEXT 1043c4000-1043c8000 [ 16K] r-x/r-x SM=COW ...it.WebContent
Exception Note: EXC_CORPSE_NOTIFY
Termination Reason: SIGNAL 11 Segmentation fault: 11
Terminating Process: exc handler [372]
Triggered by Thread: 16
Thread 16 name: EncoderQueue
Thread 16 Crashed:
0 WebKit 0x18f708f18 void WebCore::RemoteVideoSample::encode<IPC::Encoder>(IPC::Encoder&) const + 36
1 WebKit 0x18fcf8a04 WebKit::encodeVideoFrame(void*, webrtc::VideoFrame const&, bool) + 708
2 WebKit 0x18fcf8a04 WebKit::encodeVideoFrame(void*, webrtc::VideoFrame const&, bool) + 708
3 libwebrtc.dylib 0x1e9eace44 webrtc::VideoStreamEncoder::EncodeVideoFrame(webrtc::VideoFrame const&, long long) + 3336
4 libwebrtc.dylib 0x1e9eb19f4 webrtc::webrtc_new_closure_impl::ClosureTask<webrtc::VideoStreamEncoder::OnFrame(webrtc::VideoFrame const&)::$_13>::Run() + 5376
5 libwebrtc.dylib 0x1e9e47e94 std::__1::__function::__func<webrtc::(anonymous namespace)::TaskQueueStdlib::TaskQueueStdlib(std::__1::basic_string_view<char, std::__1::char_traits<char> >, rtc::ThreadPriority)::$_1, std::__1::allocator<webrtc::(anonymous namespace)::TaskQueueStdlib::TaskQueueStdlib(std::__1::basic_string_view<char, std::__1::char_traits<char> >, rtc::ThreadPriority)::$_1>, void ()>::operator()() + 920
6 libwebrtc.dylib 0x1e9ce6b38 std::__1::__function::__func<rtc::PlatformThread::SpawnThread(std::__1::function<void ()>, std::__1::basic_string_view<char, std::__1::char_traits<char> >, rtc::ThreadAttributes, bool)::$_1, std::__1::allocator<rtc::PlatformThread::SpawnThread(std::__1::function<void ()>, std::__1::basic_string_view<char, std::__1::char_traits<char> >, rtc::ThreadAttributes, bool)::$_1>, void ()>::operator()() + 260
7 libwebrtc.dylib 0x1e9ce6504 rtc::(anonymous namespace)::RunPlatformThread(void*) + 64
8 libsystem_pthread.dylib 0x1f01469a4 _pthread_start + 148
9 libsystem_pthread.dylib 0x1f0145ea0 thread_start + 8
...
Having the same issue. A WebRTC app (publisher) did run up to 15.0.2. Today upgraded to 15.1. Crash after the browser asked for consent to use camera and mic. Happens on iPhone and iPad. Didn't happen on the iPad one hour earlier when 15.0.2 was on the iPad.
There is no indication for the reason of the crash in the browser console log (viewed from my MBP). I didn't check the crash dumps yet.