Pavel Begunkov 544d163d65 io_uring: lock overflowing for IOPOLL ... syzbot reports an issue with overflow filling for IOPOLL: WARNING: CPU: 0 PID: 28 at io_uring/io_uring.c:734 io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734 CPU: 0 PID: 28 Comm: kworker/u4:1 Not tainted 6.2.0-rc3-syzkaller-16369-g358a161a6a9e #0 Workqueue: events_unbound io_ring_exit_work Call trace:  io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734  io_req_cqe_overflow+0x5c/0x70 io_uring/io_uring.c:773  io_fill_cqe_req io_uring/io_uring.h:168 [inline]  io_do_iopoll+0x474/0x62c io_uring/rw.c:1065  io_iopoll_try_reap_events+0x6c/0x108 io_uring/io_uring.c:1513  io_uring_try_cancel_requests+0x13c/0x258 io_uring/io_uring.c:3056  io_ring_exit_work+0xec/0x390 io_uring/io_uring.c:2869  process_one_work+0x2d8/0x504 kernel/workqueue.c:2289  worker_thread+0x340/0x610 kernel/workqueue.c:2436  kthread+0x12c/0x158 kernel/kthread.c:376  ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:863 There is no real problem for normal IOPOLL as flush is also called with uring_lock taken, but it's getting more complicated for IOPOLL|SQPOLL, for which __io_cqring_overflow_flush() happens from the CQ waiting path. Reported-and-tested-by: syzbot+6805087452d72929404e@syzkaller.appspotmail.com Cc: stable@vger.kernel.org # 5.10+ Signed-off-by: Pavel Begunkov <asml.silence@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>		2023-01-13 07:32:46 -07:00
..
advise.c
advise.h
alloc_cache.h
cancel.c	io_uring/cancel: re-grab ctx mutex after finishing wait	2022-12-21 13:31:40 -07:00
cancel.h
epoll.c
epoll.h
fdinfo.c	io_uring/fdinfo: include locked hash table in fdinfo output	2023-01-10 10:24:52 -07:00
fdinfo.h
filetable.c	io_uring/filetable: fix file reference underflow	2022-11-25 06:54:46 -07:00
filetable.h
fs.c
fs.h
io_uring.c	io_uring: fix CQ waiting timeout handling	2023-01-05 08:04:47 -07:00
io_uring.h	io_uring: lockdep annotate CQ locking	2023-01-03 19:05:41 -07:00
io-wq.c	io_uring/io-wq: only free worker if it was allocated for creation	2023-01-08 10:39:17 -07:00
io-wq.h
kbuf.c	io_uring: don't use complete_post in kbuf	2022-11-25 06:11:15 -07:00
kbuf.h
Makefile
msg_ring.c	io_uring/msg_ring: flag target ring as having task_work, if needed	2022-12-08 09:36:02 -07:00
msg_ring.h	io_uring: get rid of double locking	2022-12-07 06:47:13 -07:00
net.c	io_uring/net: fix cleanup after recycle	2022-12-19 08:28:28 -07:00
net.h
nop.c
nop.h
notif.c	io_uring/net: move mm accounting to a slower path	2022-11-21 07:38:31 -07:00
notif.h	io_uring: move zc reporting from the hot path	2022-11-21 07:38:31 -07:00
opdef.c	io_uring: get rid of double locking	2022-12-07 06:47:13 -07:00
opdef.h	io_uring: dont remove file from msg_ring reqs	2022-12-07 06:47:13 -07:00
openclose.c
openclose.h
poll.c	io_uring/poll: attempt request issue after racy poll wakeup	2023-01-12 10:35:51 -07:00
poll.h
refs.h
rsrc.c	io_uring: use tw for putting rsrc	2022-12-07 06:47:13 -07:00
rsrc.h	io_uring: use tw for putting rsrc	2022-12-07 06:47:13 -07:00
rw.c	io_uring: lock overflowing for IOPOLL	2023-01-13 07:32:46 -07:00
rw.h
slist.h
splice.c
splice.h
sqpoll.c
sqpoll.h
statx.c
statx.h
sync.c
sync.h
tctx.c
tctx.h
timeout.c	io_uring: ease timeout flush locking requirements	2022-12-14 08:53:35 -07:00
timeout.h
uring_cmd.c	io_uring: iopoll protect complete_post	2022-11-23 10:45:31 -07:00
uring_cmd.h
xattr.c	acl: conver higher-level helpers to rely on mnt_idmap	2022-10-31 17:48:12 +01:00
xattr.h