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* [PATCH] io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
@ 2021-01-16  3:57 Jens Axboe
  0 siblings, 0 replies; only message in thread
From: Jens Axboe @ 2021-01-16  3:57 UTC (permalink / raw)
  To: io-uring

If we enter with requests pending and performm cancelations, we'll have
a different inflight count before and after calling prepare_to_wait().
This causes the loop to restart. If we actually ended up canceling
everything, or everything completed in-between, then we'll break out
of the loop without calling finish_wait() on the waitqueue. This can
trigger a warning on exit_signals(), as we leave the task state in
TASK_UNINTERRUPTIBLE.

Put a finish_wait() after the loop to catch that case.

Cc: [email protected] # 5.9+
Signed-off-by: Jens Axboe <[email protected]>

---

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 06cc79d39586..985a9e3f976d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9101,6 +9101,7 @@ void __io_uring_task_cancel(void)
 		finish_wait(&tctx->wait, &wait);
 	} while (1);
 
+	finish_wait(&tctx->wait, &wait);
 	atomic_dec(&tctx->in_idle);
 
 	io_uring_remove_task_files(tctx);
-- 
Jens Axboe


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2021-01-16  3:57 [PATCH] io_uring: ensure finish_wait() is always called in __io_uring_task_cancel() Jens Axboe

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