loop4: detected capacity change from 0 to 512
=============================
WARNING: suspicious RCU usage
5.17.0-rc3-next-20220207 #1 Not tainted
-----------------------------
fs/io_uring.c:9411 suspicious rcu_dereference_protected() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
2 locks held by kworker/u4:0/8:
 #0: ffff888007861138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x915/0x16a0
 #1: ffff888008187db0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x949/0x16a0

stack backtrace:
CPU: 1 PID: 8 Comm: kworker/u4:0 Not tainted 5.17.0-rc3-next-20220207 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014
Workqueue: events_unbound io_ring_exit_work
Call Trace:
 <TASK>
 dump_stack_lvl+0x8b/0xb3
 io_eventfd_unregister+0xee/0x110
 io_ring_exit_work+0x77d/0xbec
 process_one_work+0xa1c/0x16a0
 worker_thread+0x637/0x1260
 kthread+0x2f0/0x3a0
 ret_from_fork+0x22/0x30
 </TASK>
[EXT4 FS bs=2048, gc=1, bpg=16384, ipg=32, mo=a802c018, mo2=0002]
System zones: 0-7
SELinux: unrecognized netlink message: protocol=6 nlmsg_type=259 sclass=netlink_xfrm_socket pid=4004 comm=syz-executor.5
EXT4-fs (loop4): mounted filesystem without journal. Quota mode: none.
loop7: detected capacity change from 0 to 328
FAT-fs (loop7): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1)
loop1: detected capacity change from 0 to 7
ext4: Unknown parameter '?²'
loop1: detected capacity change from 0 to 7
ext4: Unknown parameter '?²'