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milos-linux/io_uring
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Yufan Chen 04fe9aeb4f io_uring/eventfd: reset deferred signal state 
Recursive eventfd wakeups must defer io_uring eventfd signaling because
eventfd_signal_mask() rejects reentry from eventfd wakeup handlers. The
io_ev_fd ops bit tracks an outstanding deferred signal so that the same
rcu_head is not queued twice.

That bit is only set today. Once the first deferred callback runs, later
recursive notifications still see the bit set and skip queueing another
deferred signal. This can leave new completions without a matching
eventfd wake after the first recursive deferral.

Clear the pending bit before issuing the deferred signal. If the wakeup
path recurses while the callback runs, a new signal can be queued for
the next RCU grace period while the current callback keeps its reference
until it returns.

Signed-off-by: Yufan Chen <ericterminal@gmail.com>
Fixes: 60b6c075e8 ("io_uring/eventfd: move to more idiomatic RCU free usage")
Link: https://patch.msgid.link/20260503175710.37209-1-yufan.chen@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2026-05-03 23:21:40 -06:00
..
advise.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
advise.h
alloc_cache.c
alloc_cache.h io_uring/rsrc: use kvfree() for the imu cache 2026-04-21 12:19:01 -06:00
bpf-ops.c io_uring: unify getting ctx from passed in file descriptor 2026-04-08 13:21:35 -06:00
bpf-ops.h io_uring/bpf-ops: implement bpf ops registration 2026-03-16 16:15:00 -06:00
bpf_filter.c Merge branch 'io_uring-7.0' into for-7.1/io_uring 2026-03-14 08:57:15 -06:00
bpf_filter.h io_uring: allow registration of per-task restrictions 2026-02-06 07:29:19 -07:00
cancel.c io_uring/cancel: validate opcode for IORING_ASYNC_CANCEL_OP 2026-04-01 10:21:13 -06:00
cancel.h io_uring/cancel: de-unionize file and user_data in struct io_cancel_data 2026-02-16 14:16:27 -07:00
cmd_net.c io_uring/cmd_net: split ioctl code out of io_uring_cmd_sock() 2026-03-09 07:21:53 -06:00
epoll.c io_uring: finish IOU_OK -> IOU_COMPLETE transition 2025-05-21 08:41:16 -06:00
epoll.h
eventfd.c io_uring/eventfd: reset deferred signal state 2026-05-03 23:21:40 -06:00
eventfd.h io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
fdinfo.c io_uring/fdinfo: fix OOB read in SQE_MIXED wrap check 2026-03-26 20:28:28 -06:00
fdinfo.h
filetable.c io_uring/filetable: clamp alloc_hint to the configured alloc range 2026-02-11 15:20:44 -07:00
filetable.h io_uring: Trim out unused includes 2026-01-05 17:08:20 -07:00
fs.c non-consuming variants of do_{unlinkat,rmdir}() 2026-01-16 12:51:50 -05:00
fs.h
futex.c io_uring/futex: ensure partial wakes are appropriately dequeued 2026-04-21 12:19:06 -06:00
futex.h
io-wq.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
io-wq.h io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
io_uring.c io_uring: fix spurious fput in registered ring path 2026-04-21 12:18:44 -06:00
io_uring.h for-7.1/io_uring-20260411 2026-04-13 16:22:30 -07:00
kbuf.c io_uring/kbuf: support min length left for incremental buffers 2026-04-28 16:08:56 -06:00
kbuf.h io_uring/kbuf: support min length left for incremental buffers 2026-04-28 16:08:56 -06:00
Kconfig io_uring/bpf-ops: implement loop_step with BPF struct_ops 2026-03-16 16:15:00 -06:00
loop.c io_uring: introduce callback driven main loop 2026-03-16 16:15:00 -06:00
loop.h io_uring: introduce callback driven main loop 2026-03-16 16:15:00 -06:00
Makefile io_uring/bpf-ops: implement loop_step with BPF struct_ops 2026-03-16 16:15:00 -06:00
memmap.c io_uring: take page references for NOMMU pbuf_ring mmaps 2026-04-21 20:14:39 -06:00
memmap.h io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
mock_file.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
msg_ring.c io_uring: switch struct io_ring_ctx internal bitfields to flags 2026-03-16 15:32:59 -06:00
msg_ring.h
napi.c io_uring/napi: clear tracked NAPI entries on unregister 2026-05-03 23:21:23 -06:00
napi.h io_uring/napi: clear tracked NAPI entries on unregister 2026-05-03 23:21:23 -06:00
net.c for-7.1/io_uring-20260411 2026-04-13 16:22:30 -07:00
net.h io_uring/zctx: unify zerocopy issue variants 2026-03-09 07:21:54 -06:00
nop.c io_uring/nop: add support for IORING_SETUP_CQE_MIXED 2025-08-27 11:24:15 -06:00
nop.h
notif.c io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
notif.h
opdef.c io_uring: remove iopoll_queue from struct io_issue_def 2026-03-16 16:14:14 -06:00
opdef.h io_uring: remove iopoll_queue from struct io_issue_def 2026-03-16 16:14:14 -06:00
openclose.c io_uring/openclose: fix io_pipe_fixed() slot tracking for specific slots 2026-02-11 20:31:21 -07:00
openclose.h io_uring/bpf_filter: allow filtering on contents of struct open_how 2026-01-27 11:10:46 -07:00
poll.c io_uring/poll: ensure EPOLL_ONESHOT is propagated for EPOLL_URING_WAKE 2026-04-21 19:18:34 -06:00
poll.h io_uring: add wrapper type for io_req_tw_func_t arg 2025-11-03 08:31:26 -07:00
query.c io_uring/zcrx: declare some constants for query 2026-03-09 07:21:54 -06:00
query.h io_uring/query: drop unused io_handle_query_entry() ctx arg 2025-11-26 09:37:10 -07:00
refs.h io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
register.c io_uring/register: fix ring resizing with mixed/large SQEs/CQEs 2026-04-21 12:19:08 -06:00
register.h io_uring: unify getting ctx from passed in file descriptor 2026-04-08 13:21:35 -06:00
rsrc.c io_uring/rsrc: use kvfree() for the imu cache 2026-04-21 12:19:01 -06:00
rsrc.h io_uring/rsrc: unify nospec indexing for direct descriptors 2026-04-21 12:18:54 -06:00
rw.c io_uring/rw: add defensive hardening for negative kbuf lengths 2026-04-21 12:19:03 -06:00
rw.h io_uring: add wrapper type for io_req_tw_func_t arg 2025-11-03 08:31:26 -07:00
slist.h io_uring: Add SPDX id lines to remaining source files 2026-02-04 07:23:45 -07:00
splice.c io_uring: don't include filetable.h in io_uring.h 2025-09-08 13:20:46 -06:00
splice.h
sqpoll.c io_uring/tctx: have io_uring_alloc_task_context() return tctx 2026-04-08 13:21:30 -06:00
sqpoll.h io_uring/sqpoll: switch away from getrusage() for CPU accounting 2025-10-22 10:51:20 -06:00
statx.c allow incomplete imports of filenames 2026-01-13 15:18:07 -05:00
statx.h
sync.c io_uring/sync: validate passed in offset 2026-01-21 11:50:59 -07:00
sync.h
tctx.c io_uring: fix iowq_limits data race in tctx node addition 2026-04-20 14:57:21 -06:00
tctx.h io_uring/tctx: have io_uring_alloc_task_context() return tctx 2026-04-08 13:21:30 -06:00
timeout.c io_uring/timeout: use 'ctx' consistently 2026-04-02 07:08:40 -06:00
timeout.h io_uring/timeout: migrate reqs from ts64 to ktime 2026-03-09 07:21:54 -06:00
truncate.c fs: pass on FTRUNCATE_* flags to do_truncate 2026-03-23 12:41:57 +01:00
truncate.h
tw.c io_uring/tw: serialize ctx->retry_llist with ->uring_lock 2026-04-30 06:57:20 -06:00
tw.h io_uring: split out CQ waiting code into wait.c 2026-01-22 09:21:16 -07:00
uring_cmd.c io_uring/uring_cmd: allow non-iopoll cmds with IORING_SETUP_IOPOLL 2026-03-16 16:14:14 -06:00
uring_cmd.h io_uring/cmd: remove struct io_uring_cmd_data 2025-07-18 12:34:56 -06:00
wait.c io_uring: protect remaining lockless ctx->rings accesses with RCU 2026-04-01 08:34:11 -06:00
wait.h for-7.1/io_uring-20260411 2026-04-13 16:22:30 -07:00
waitid.c io_uring/waitid: fix KCSAN warning on io_waitid->head 2026-01-19 19:55:30 -07:00
waitid.h
xattr.c Convert 'alloc_obj' family to use the new default GFP_KERNEL argument 2026-02-21 17:09:51 -08:00
xattr.h
zcrx.c io_uring/zcrx: warn on freelist violations 2026-04-21 12:19:11 -06:00
zcrx.h io_uring/zcrx: rename zcrx [un]register functions 2026-04-01 10:21:13 -06:00