[Webkit-unassigned] [Bug 201543] New: [macOS] Pid is sometimes invalid when creating sandbox extensions by pid.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201543

            Bug ID: 201543
           Summary: [macOS] Pid is sometimes invalid when creating sandbox
                    extensions by pid.
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pvollan at apple.com

There is a race condition when starting a load of a local file, where the WebContent process has not finished launching yet, and its pid is not available. When we try to create a sandbox extension by using the pid of the WebContent process, it is not available in the cases where the WebContent process has just launched and has not finished launching yet. This problem can be fixed by waiting for the WebContent process to finish launching before creating the sandbox extension. In order to do that, the process launcher must not run the launch reply block on the main thread as it currently does, since that block would never be executed when the main thread is waiting for the process to finish launching.

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