============================= 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/u4:4/320: #0: ffff888007861138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x915/0x16a0 #1: ffff88801eb3fdb0 ((work_completion)(&ctx->exit_work)){+.+.}-{0:0}, at: process_one_work+0x949/0x16a0 stack backtrace: CPU: 1 PID: 320 Comm: kworker/u4:4 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 loop4: detected capacity change from 0 to 4096 ext4: Unknown parameter 'x' tmpfs: Unsupported parameter 'huge' loop1: detected capacity change from 0 to 140 audit: type=1400 audit(1644310858.025:7): avc: denied { module_load } for pid=3852 comm="syz-executor.4" path="/sys/kernel/notes" dev="sysfs" ino=134 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:object_r:sysfs_t:s0 tclass=system permissive=1 Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF loop4: detected capacity change from 0 to 4096 ext4: Unknown parameter 'x' wlan0: Created IBSS using preconfigured BSSID 50:50:50:50:50:50 wlan0: Creating new IBSS network, BSSID 50:50:50:50:50:50 EXT4-fs (loop1): mounted filesystem without journal. Quota mode: none. IPv6: ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready ext4 filesystem being mounted at /syzkaller-testdir749428770/syzkaller.eCmvLE/3/mnt supports timestamps until 2038 (0x7fffffff) Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF loop4: detected capacity change from 0 to 4096 ext4: Unknown parameter 'x' tmpfs: Unsupported parameter 'huge' Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF Invalid ELF header magic: != ELF 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 loop0: detected capacity change from 0 to 1 nfs: Unknown parameter 'security.selinux' audit: type=1400 audit(2000000000.115:8): avc: denied { open } for pid=3879 comm="syz-executor.0" scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=perf_event permissive=1 loop2: detected capacity change from 0 to 52 loop2: detected capacity change from 0 to 52 loop0: detected capacity change from 0 to 1 nfs: Unknown parameter 'security.selinux' 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 audit: type=1400 audit(2000000001.085:9): avc: denied { block_suspend } for pid=4011 comm="syz-executor.6" capability=36 scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1