[Bug 53278] New: schedsvc:rpcapi once failed to release the RPC handle on Windows

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=53278

Bug ID: 53278
           Summary: schedsvc:rpcapi once failed to release the RPC handle
                    on Windows
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Windows
            Status: NEW
          Severity: normal
          Priority: P2
         Component: -unknown
          Assignee: [e-mail]
          Reporter: [e-mail]

schedsvc:rpcapi once failed to release the RPC handle on Windows:

rpcapi.c:514: Test failed: expected S_OK, got 0x80070091

https://test.winehq.org/data/patterns.html#schedsvc:rpcapi

Where 0x80070091 == HRESULT_FROM_WIN32(ERROR_PATH_BUSY).

There was no other failure in that 2022-06-24 w10pro64-ar run.
It looks like there was still some operation pending that caused the final
RpcBindingFree() to fail. So maybe some sort of a race condition?

In another run a pair of SchRpcDelete() calls much earlier in the test failed
with the same error (2022-06-06 w10pro64-fr):

rpcapi.c:234: Test failed: expected S_OK, got 0x80070091
rpcapi.c:236: Test failed: expected S_OK, got 0x80070091
rpcapi.c:242: Test failed: expected ERROR_FILE_NOT_FOUND, got 0
rpcapi.c:243: Test failed: expected 0, got 1
rpcapi.c:244: Test failed: expected 0, got 1
rpcapi.c:245: Test failed: expected NULL, got 0000000000735EF0
rpcapi.c:248: Test failed: expected S_OK, got 0x800700b7
rpcapi.c:255: Test failed: expected 0, got 1
rpcapi.c:256: Test failed: expected 0, got 1
rpcapi.c:257: Test failed: expected NULL, got 00000000007358F0
rpcapi.c:260: Test failed: expected S_OK, got 0x800700b7

Note: The HRESULT_FROM_WIN32(ERROR_ALREADY_EXISTS) == 0x800700b7 errors are
probably caused by the initial SchRpcDelete() failures.