From: Pavel Begunkov asml.silence@gmail.com
commit 3cc7fdb9f90a25ae92250bf9e6cf3b9556b230e9 upstream.
tctx_task_work() may get run after io_uring cancellation and so there will be no one to put cached in tctx task refs that may have been added back by tw handlers using inline completion infra, Call io_uring_drop_tctx_refs() at the end of the main tw handler to release them.
Cc: stable@vger.kernel.org # 5.15+ Reported-by: Lukas Bulwahn lukas.bulwahn@gmail.com Fixes: e98e49b2bbf7 ("io_uring: extend task put optimisations") Signed-off-by: Pavel Begunkov asml.silence@gmail.com Link: https://lore.kernel.org/r/69f226b35fbdb996ab799a8bbc1c06bf634ccec1.164168880... Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/io_uring.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-)
--- a/fs/io_uring.c +++ b/fs/io_uring.c @@ -1760,6 +1760,18 @@ static inline void io_get_task_refs(int io_task_refs_refill(tctx); }
+static __cold void io_uring_drop_tctx_refs(struct task_struct *task) +{ + struct io_uring_task *tctx = task->io_uring; + unsigned int refs = tctx->cached_refs; + + if (refs) { + tctx->cached_refs = 0; + percpu_counter_sub(&tctx->inflight, refs); + put_task_struct_many(task, refs); + } +} + static bool io_cqring_event_overflow(struct io_ring_ctx *ctx, u64 user_data, long res, unsigned int cflags) { @@ -2200,6 +2212,10 @@ static void tctx_task_work(struct callba }
ctx_flush_and_put(ctx, &locked); + + /* relaxed read is enough as only the task itself sets ->in_idle */ + if (unlikely(atomic_read(&tctx->in_idle))) + io_uring_drop_tctx_refs(current); }
static void io_req_task_work_add(struct io_kiocb *req) @@ -9766,18 +9782,6 @@ static s64 tctx_inflight(struct io_uring return percpu_counter_sum(&tctx->inflight); }
-static void io_uring_drop_tctx_refs(struct task_struct *task) -{ - struct io_uring_task *tctx = task->io_uring; - unsigned int refs = tctx->cached_refs; - - if (refs) { - tctx->cached_refs = 0; - percpu_counter_sub(&tctx->inflight, refs); - put_task_struct_many(task, refs); - } -} - /* * Find any io_uring ctx that this task has registered or done IO on, and cancel * requests. @sqd should be not-null IFF it's an SQPOLL thread cancellation. @@ -9834,10 +9838,14 @@ static void io_uring_cancel_generic(bool schedule(); finish_wait(&tctx->wait, &wait); } while (1); - atomic_dec(&tctx->in_idle);
io_uring_clean_tctx(tctx); if (cancel_all) { + /* + * We shouldn't run task_works after cancel, so just leave + * ->in_idle set for normal exit. + */ + atomic_dec(&tctx->in_idle); /* for exec all current's requests should be gone, kill tctx */ __io_uring_free(current); }