• Nico Hartmann's avatar
    Revert "[heap] Attach to shared isolate after setting up main thread" · e784bf61
    Nico Hartmann authored
    This reverts commit 929b83fb.
    
    Reason for revert: https://ci.chromium.org/ui/p/v8/builders/ci/V8%20Linux64%20UBSan/18725/overview
    
    Original change's description:
    > [heap] Attach to shared isolate after setting up main thread
    >
    > Attach to the shared isolate after the main thread was set up. Otherwise
    > it could happen that a shared GC initiated from another isolate might
    > see no threads are running and performs the safepoint operation in the
    > middle of isolate deserialization.
    >
    > We use DisallowSafepoints to check that the isolate doesn't join a
    > global safepoint before deserialization is complete. DisallowSafepoints
    > used to prevent only invocations of Safepoint() but was updated to
    > also prevent Park() and Unpark() invocations. Each state change could
    > cause the thread to reach a safepoint, which would allow a shared GC
    > to run.
    >
    > We now also DCHECK that every isolate has at least one local heap and
    > that shared collections aren't started before deserialization is
    > complete.
    >
    > Bug: v8:11708
    > Change-Id: Iba3fb59dd951d5ee4fc9934158062287302fc279
    > Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3221157
    > Commit-Queue: Dominik Inführ <dinfuehr@chromium.org>
    > Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
    > Reviewed-by: Shu-yu Guo <syg@chromium.org>
    > Reviewed-by: Jakob Gruber <jgruber@chromium.org>
    > Cr-Commit-Position: refs/heads/main@{#77424}
    
    Bug: v8:11708
    Change-Id: I0633150b6b40b297a335a39bf1a087ca93592e04
    No-Presubmit: true
    No-Tree-Checks: true
    No-Try: true
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3225937Reviewed-by: 's avatarNico Hartmann <nicohartmann@chromium.org>
    Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
    Owners-Override: Nico Hartmann <nicohartmann@chromium.org>
    Commit-Queue: Nico Hartmann <nicohartmann@chromium.org>
    Cr-Commit-Position: refs/heads/main@{#77425}
    e784bf61
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