Pavel Begunkov 5c402f323f io_uring/io-wq: limit retrying worker initialisation ... commit 0453aad676 upstream. If io-wq worker creation fails, we retry it by queueing up a task_work. tasK_work is needed because it should be done from the user process context. The problem is that retries are not limited, and if queueing a task_work is the reason for the failure, we might get into an infinite loop. It doesn't seem to happen now but it would with the following patch executing task_work in the freezer's loop. For now, arbitrarily limit the number of attempts to create a worker. Cc: stable@vger.kernel.org Fixes: 3146cba99a ("io-wq: make worker creation resilient against signals") Reported-by: Julian Orth <ju.orth@gmail.com> Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Link: https://lore.kernel.org/r/8280436925db88448c7c85c6656edee1a43029ea.1720634146.git.asml.silence@gmail.com Signed-off-by: Jens Axboe <axboe@kernel.dk> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2024-08-19 05:45:22 +02:00
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io_uring.c	io_uring: tighten task exit cancellations	2024-08-19 05:45:14 +02:00
io-wq.c	io_uring/io-wq: limit retrying worker initialisation	2024-08-19 05:45:22 +02:00
io-wq.h	io_uring: break out of iowq iopoll on teardown	2023-09-19 12:22:54 +02:00
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