#4: (kbd_event_lock){....}, at: [] spin_lock include/linux/spinlock.h:316 [inline] #4: (kbd_event_lock){....}, at: [] kbd_event+0x82/0x36d0 drivers/tty/vt/keyboard.c:1458 #5: (tasklist_lock){.?.+}, at: [] debug_show_all_locks+0xd3/0x400 kernel/locking/lockdep.c:4552 ============================================= BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 57s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=4/256 pending: console_callback, jump_label_update_timeout, vmstat_shepherd, cache_reap workqueue events_long: flags=0x0 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: gc_worker workqueue events_power_efficient: flags=0x80 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: neigh_periodic_work workqueue mm_percpu_wq: flags=0x8 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/256 pending: vmstat_update workqueue writeback: flags=0x4e pwq 4: cpus=0-1 flags=0x4 nice=0 active=1/256 in-flight: 3311:wb_workfn pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=12 idle: 3319 65 11442 234 3330 3334 3242 3258 21 3325 5 nla_parse: 5 callbacks suppressed netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 1 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. sctp: [Deprecated]: syz-executor0 (pid 15890) Use of int in maxseg socket option. Use struct sctp_assoc_value instead netlink: 5 bytes leftover after parsing attributes in process `syz-executor5'. QAT: Invalid ioctl sctp: [Deprecated]: syz-executor0 (pid 15901) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead QAT: Invalid ioctl audit: type=1326 audit(1507281849.491:133): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=15930 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf7f88c79 code=0xffff0000 sctp: [Deprecated]: syz-executor0 (pid 15906) Use of int in maxseg socket option. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor0 (pid 15906) Use of struct sctp_assoc_value in delayed_ack socket option. Use struct sctp_sack_info instead audit: type=1326 audit(1507281849.624:134): auid=4294967295 uid=0 gid=0 ses=4294967295 subj=kernel pid=15930 comm="syz-executor7" exe="/root/syz-executor7" sig=31 arch=40000003 syscall=240 compat=1 ip=0xf7f88c79 code=0xffff0000 print_req_error: I/O error, dev loop5, sector 0 print_req_error: I/O error, dev loop5, sector 0 netlink: 12 bytes leftover after parsing attributes in process `syz-executor4'. netlink: 12 bytes leftover after parsing attributes in process `syz-executor4'. TCP: request_sock_TCP: Possible SYN flooding on port 20024. Sending cookies. Check SNMP counters. QAT: Invalid ioctl QAT: Invalid ioctl RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? RDS: rds_bind could not find a transport for 224.0.0.1, load rds_tcp or rds_rdma? kvm [16377]: vcpu0, guest rIP: 0xfff0 Hyper-V uhandled wrmsr: 0x40000020 data 0x400 TCP: request_sock_TCPv6: Possible SYN flooding on port 20017. Sending cookies. Check SNMP counters. netlink: 13 bytes leftover after parsing attributes in process `syz-executor1'. netlink: 13 bytes leftover after parsing attributes in process `syz-executor1'. 8021q: VLANs not supported on lo 8021q: VLANs not supported on lo sock: process `syz-executor4' is using obsolete getsockopt SO_BSDCOMPAT device syz7 entered promiscuous mode device syz7 left promiscuous mode device syz7 entered promiscuous mode QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl QAT: Invalid ioctl netlink: 11 bytes leftover after parsing attributes in process `syz-executor2'. SELinux: unrecognized netlink message: protocol=0 nlmsg_type=58827 sclass=netlink_route_socket pig=17245 comm=syz-executor4 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=58827 sclass=netlink_route_socket pig=17238 comm=syz-executor4 sctp: [Deprecated]: syz-executor1 (pid 17237) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead sctp: [Deprecated]: syz-executor1 (pid 17246) Use of int in max_burst socket option deprecated. Use struct sctp_assoc_value instead SELinux: unrecognized netlink message: protocol=0 nlmsg_type=0 sclass=netlink_route_socket pig=17226 comm=syz-executor0 rpcbind: RPC call returned error 22 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=40473 sclass=netlink_route_socket pig=17283 comm=syz-executor1 SELinux: unrecognized netlink message: protocol=0 nlmsg_type=40473 sclass=netlink_route_socket pig=17298 comm=syz-executor1