From 02bac94bd8efd75f615ac7515dd2def75b43e5b9 Mon Sep 17 00:00:00 2001 From: Pavel Begunkov Date: Sun, 16 Oct 2022 21:30:51 +0100 Subject: [PATCH] io_uring: don't iopoll from io_ring_ctx_wait_and_kill() We should not be completing requests from a task context that has already undergone io_uring cancellations, i.e. __io_uring_cancel(), as there are some assumptions, e.g. around cached task refs draining. Remove iopolling from io_ring_ctx_wait_and_kill() as it can be called later after PF_EXITING is set with the last task_work run. Signed-off-by: Pavel Begunkov Link: https://lore.kernel.org/r/7c03cc91455c4a1af49c6b9cbda4e57ea467aa11.1665891182.git.asml.silence@gmail.com Signed-off-by: Jens Axboe --- io_uring/io_uring.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c index 62be51fbf39c..6cc16e39b27f 100644 --- a/io_uring/io_uring.c +++ b/io_uring/io_uring.c @@ -2804,15 +2804,12 @@ static __cold void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx) io_poll_remove_all(ctx, NULL, true); mutex_unlock(&ctx->uring_lock); - /* failed during ring init, it couldn't have issued any requests */ - if (ctx->rings) { + /* + * If we failed setting up the ctx, we might not have any rings + * and therefore did not submit any requests + */ + if (ctx->rings) io_kill_timeouts(ctx, NULL, true); - /* if we failed setting up the ctx, we might not have any rings */ - io_iopoll_try_reap_events(ctx); - /* drop cached put refs after potentially doing completions */ - if (current->io_uring) - io_uring_drop_tctx_refs(current); - } INIT_WORK(&ctx->exit_work, io_ring_exit_work); /*