d0f8a7517a
When a locked M has its G exit without calling UnlockOSThread, then lockedExt on it was getting cleared. Unfortunately, this meant that during P handoff, if a new M was started, it might get forked (on most OSs besides Windows) from the locked M, which could have kernel state attached to it. To solve this, just don't clear lockedExt. At the point where the locked M has its G exit, it will also exit in accordance with the LockOSThread API. So, we can safely assume that it's lockedExt state will no longer be used. For the case of the main thread where it just gets wedged instead of exiting, it's probably better for it to keep the locked marker since it more accurately represents its state. Fixed #28979. Change-Id: I7d3d71dd65bcb873e9758086d2cbcb9a06429b0f Reviewed-on: https://go-review.googlesource.com/c/153078 Run-TryBot: Michael Knyszek <mknyszek@google.com> Reviewed-by: Austin Clements <austin@google.com> |
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