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3b5c3f52d2
As zios are reexecuted after resume from suspension, their ready and wait states need to be propagated to wait counts on all their parents. It's possible for those parents to have active children passing through READY or DONE, which then end up in zio_notify_parent(), take their parent's lock, and decrement the wait count. Without also taking a lock here, it's possible for an increment race to occur, which leads to either there being no references left (tripping the assert in zio_notify_parent()), or a parent waiting forever for a nonexistent child to complete. To protect against this, we simply take the appropriate zio locks in zio_reexecute() before updating the wait counts. Sponsored-by: Klara, Inc. Sponsored-by: Wasabi Technology, Inc. Reviewed-by: Allan Jude <allan@klarasystems.com> Reviewed-by: Alexander Motin <mav@FreeBSD.org> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Closes #17016 |
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