============================= 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/u4:7/355: #0: ffff888007861138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x915/0x16a0 #1: ffff88801a787db0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x949/0x16a0 stack backtrace: CPU: 1 PID: 355 Comm: kworker/u4:7 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: 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 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready loop4: detected capacity change from 0 to 256 FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready loop4: detected capacity change from 0 to 256 wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready FAT-fs (loop4): Invalid FSINFO signature: 0x00000000, 0x00000000 (sector = 1) wlan1: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan1: Creating new IBSS network, BSSID 50:50:50:50:50:50 IPv6: ADDRCONF(NETDEV_CHANGE): wlan1: link becomes ready