233586 2021-11-29 12:10:33 -0800 Process crash in WebRTC call 2021-12-01 13:29:13 -0800 1 1 1 Unclassified WebKit Media Safari 15 iPhone / iPad iOS 15 NEW InRadar P2 Major --- 1 teodor.atroshenko webkit-unassigned eric.carlson jer.noble webkit-bug-importer oldest_to_newest 1818387 0 445322 teodor.atroshenko 2021-11-29 12:10:33 -0800 Created attachment 445322 Crash log Since iOS 15.1, there are crashes that are consistently reproducible when two Safari browsers connect directly (peer-to-peer) through WebRTC. Contact me to get a set of page URLs to test this on (if needed). Immediately before the crash, the remote video is rendered for at least one frame. The process crash typically happens in two steps: 1.a) WebRTC connection is established (4 media tracks in each direction, two are active, two are zero'ed out) 1.b) Remote video is displayed for at least one frame 1.c) First (small) crash - WebRTC ICE and WebSocket are gracefully terminated (WebSocket server sees client-side connection *closure*). Screen goes "blank" (full-white in lights on theme) for 500ms-1s. 2.a) Page is rendered. Local media stream (self image) appears after 500ms-1s. Remote media is missing. 2.b) JavaScript's state is seemingly uncorrupted. WebSocket is reconnected, server sends new SDP, new WebRTC session is established. 2.c) Remote video is displayed for at least one frame 2.d) Entire process crashes, blank screen is permanently displayed. (optional) 3) Reload the tab with reload icon. Repeat steps 1 and 2. Get "A problem repeatedly occurred with PAGE_URL". When the crash does not reproduce (e.g., using SFU), in iPhone 8 step 1 still happens - in other words, the screen goes blank, WebRTC is reestablished, but the second time it is stable and does not crash. In iPhone XR, using SFU, none of the issues are present. 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: 4366712832 REGION TYPE START - END [ VSIZE] PRT/MAX SHRMOD REGION DETAIL UNUSED SPACE AT START ---> __TEXT 10446c000-104470000 [ 16K] r-x/r-x SM=COW ...le.WebKit.GPU Exception Note: EXC_CORPSE_NOTIFY Termination Reason: SIGNAL; [11] Terminating Process: exc handler [12532] Full crash log attached. 1818555 1 ap 2021-11-29 17:40:36 -0800 rdar://80407863 445322 2021-11-29 12:10:33 -0800 2021-11-29 12:10:33 -0800 Crash log memory.crash.log text/plain 13083 teodor.atroshenko SW5jaWRlbnQgSWRlbnRpZmllcjogNkIzM0E5QkQtREUyOC00ODQ2LUI1QUYtN0M1MTlGMTYwRTg5 CkNyYXNoUmVwb3J0ZXIgS2V5OiAgIDY1ZDgzNTY3OWExNmM1ZWZjMzg0MzUyMGJmY2I4YjQyMDcx M2E5ZDEKSGFyZHdhcmUgTW9kZWw6ICAgICAgaVBob25lMTAsNApQcm9jZXNzOiAgICAgICAgICAg ICBjb20uYXBwbGUuV2ViS2l0LkdQVSBbMTI1MzJdClBhdGg6ICAgICAgICAgICAgICAgIC9TeXN0 ZW0vTGlicmFyeS9GcmFtZXdvcmtzL1dlYktpdC5mcmFtZXdvcmsvWFBDU2VydmljZXMvY29tLmFw cGxlLldlYktpdC5HUFUueHBjL2NvbS5hcHBsZS5XZWJLaXQuR1BVCklkZW50aWZpZXI6ICAgICAg 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