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Kernel/Threads: A thread waking up by timeout from a WaitProcessWideKey may already have an assigned lock owner.
This situation may happen like so: Thread 1 with low priority calls WaitProcessWideKey with timeout. Thread 2 with high priority calls WaitProcessWideKey without timeout. Thread 3 calls SignalProcessWideKey - Thread 2 acquires the lock and awakens. - Thread 1 can't acquire the lock and is put to sleep with the lock owner being Thread 2. Thread 1's timeout expires, with the lock owner still being set to Thread 2.
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1 changed files with 5 additions and 2 deletions
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@ -133,8 +133,11 @@ static void ThreadWakeupCallback(u64 thread_handle, int cycles_late) {
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auto lock_owner = thread->lock_owner;
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// Threads waking up by timeout from WaitProcessWideKey do not perform priority inheritance
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// and don't have a lock owner.
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ASSERT(lock_owner == nullptr);
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// and don't have a lock owner unless SignalProcessWideKey was called first and the thread
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// wasn't awakened due to the mutex already being acquired.
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if (lock_owner) {
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lock_owner->RemoveMutexWaiter(thread);
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}
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}
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if (resume)
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