[Webkit-unassigned] [Bug 178357] New: iOS locks up when in portrait mode within WebRTC session

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=178357

            Bug ID: 178357
           Summary: iOS locks up when in portrait mode within WebRTC
                    session
           Product: WebKit
           Version: Safari 11
          Hardware: iPhone / iPad
                OS: iOS 11
            Status: NEW
          Severity: Critical
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: mikeblock at rogers.com
                CC: youennf at gmail.com

While inside an RTC session, if I the device is in portrait mode, playback works for about 5 seconds and then the display becomes frozen and non-responsive.

The local stream is still delivered to the connected remote peers while the display is locked, at least for a minimum of 30 seconds after the device locks up.

There is nothing in the debug console reporting an issue. Not sure what events would be raised when this issue is triggered.

This is a consistent and repeatable event. I'm testing on an iPad Mini ME277C/A running iOS 11.0.3 (15A432)

- It seems from other reports that the lockup may release after several minutes on it's own.
- Tests have been conducted in a closed loop (i.e. all devices in the same physical network location).
- Once connected, there is no additional data being passed between the device and server outside the RTCPeerConnection objects themselves (i.e. no other TCP traffic)

If the screen is not rotated, no lockup seems to occur, but longer tests would be required to confirm this is the case.

Other developers seem to have suggested that cropping the display of a video inside an HTML container DIV using  CSS is the reason for the issue.

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