netlink: 100 bytes leftover after parsing attributes in process `syz-executor.4'. Bluetooth: hci1 command 0x0406 tx timeout Bluetooth: hci2 command 0x0406 tx timeout Bluetooth: hci5 command 0x0406 tx timeout BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 222s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=21/256 refcnt=22 in-flight: 8972:rtc_timer_do_work pending: defense_work_handler, wait_rcu_exp_gp, defense_work_handler, defense_work_handler, defense_work_handler, defense_work_handler, cache_reap, macvlan_process_broadcast, nfc_urelease_event_work, free_obj_work, rht_deferred_worker, macvlan_process_broadcast, macvlan_process_broadcast, macvlan_process_broadcast, macvlan_process_broadcast, macvlan_process_broadcast, macvlan_process_broadcast, hci_cmd_timeout, hci_cmd_timeout, hci_cmd_timeout workqueue events_long: flags=0x0 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: gc_worker workqueue events_unbound: flags=0x2 pwq 4: cpus=0-1 flags=0x4 nice=0 active=4/512 refcnt=7 in-flight: 33:fsnotify_mark_destroy_workfn fsnotify_mark_destroy_workfn, 48:fsnotify_connector_destroy_workfn fsnotify_connector_destroy_workfn workqueue events_freezable: flags=0x4 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: update_balloon_stats_func workqueue events_power_efficient: flags=0x80 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: process_srcu workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: vmstat_update workqueue dm_bufio_cache: flags=0x8 pwq 2: cpus=1 node=0 flags=0x0 nice=0 active=1/256 refcnt=2 pending: work_fn workqueue ipv6_addrconf: flags=0x40008 pwq 0: cpus=0 node=0 flags=0x0 nice=0 active=1/1 refcnt=2 in-flight: 9085:addrconf_verify_work pool 0: cpus=0 node=0 flags=0x0 nice=0 hung=0s workers=5 idle: 8838 25 4313 3 pool 2: cpus=1 node=0 flags=0x0 nice=0 hung=222s workers=5 idle: 18 3624 9216 23 pool 4: cpus=0-1 flags=0x4 nice=0 hung=0s workers=7 idle: 22 9287 10259 2850 5 INFO: task kworker/u4:2:33 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:2 D26784 33 2 0x80000000 Workqueue: events_unbound fsnotify_mark_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 fsnotify_mark_destroy_workfn+0xed/0x2e0 fs/notify/mark.c:757 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task kworker/u4:3:48 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/u4:3 D28816 48 2 0x80000000 Workqueue: events_unbound fsnotify_connector_destroy_workfn Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_timeout+0x80a/0xe90 kernel/time/timer.c:1724 do_wait_for_common kernel/sched/completion.c:91 [inline] __wait_for_common kernel/sched/completion.c:112 [inline] wait_for_common+0x272/0x430 kernel/sched/completion.c:123 __synchronize_srcu+0x10a/0x1d0 kernel/rcu/srcutree.c:898 fsnotify_connector_destroy_workfn+0x49/0xa0 fs/notify/mark.c:156 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 INFO: task syz-executor.2:10253 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27984 10253 7989 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 nfnl_lock net/netfilter/nfnetlink.c:61 [inline] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:303 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:495 [inline] nfnetlink_rcv+0x554/0x1da0 net/netfilter/nfnetlink.c:513 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb648346049 RSP: 002b:00007fb646cbb168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb648458f60 RCX: 00007fb648346049 RDX: 0000000000000000 RSI: 0000000020000440 RDI: 0000000000000003 RBP: 00007fb6483a008d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff36a7cdff R14: 00007fb646cbb300 R15: 0000000000022000 INFO: task syz-executor.2:10265 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.2 D27832 10265 7989 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 _synchronize_rcu_expedited+0x522/0x770 kernel/rcu/tree_exp.h:615 synchronize_rcu+0x98/0x130 kernel/rcu/tree_plugin.h:762 nf_tables_abort+0x12ff/0x2360 net/netfilter/nf_tables_api.c:5362 nfnetlink_rcv_batch net/netfilter/nfnetlink.c:448 [inline] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:495 [inline] nfnetlink_rcv+0x13e3/0x1da0 net/netfilter/nfnetlink.c:513 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 ___sys_sendmsg+0x6c8/0x800 net/socket.c:2062 __sys_sendmsg+0xa3/0x120 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb648346049 RSP: 002b:00007fb646c9a168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb648459030 RCX: 00007fb648346049 RDX: 0000000000000000 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00007fb6483a008d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff36a7cdff R14: 00007fb646c9a300 R15: 0000000000022000 INFO: task syz-executor.5:10266 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.5 D28696 10266 7986 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 nft_register_afinfo+0x63/0x190 net/netfilter/nf_tables_api.c:39 nf_tables_ipv4_init_net+0xb5/0x140 net/ipv4/netfilter/nf_tables_ipv4.c:70 ops_init+0xaa/0x3e0 net/core/net_namespace.c:118 setup_net+0x22f/0x530 net/core/net_namespace.c:298 copy_net_ns+0x19b/0x440 net/core/net_namespace.c:422 create_new_namespaces+0x375/0x720 kernel/nsproxy.c:107 copy_namespaces+0x27b/0x310 kernel/nsproxy.c:165 copy_process.part.0+0x25f8/0x71c0 kernel/fork.c:1794 copy_process kernel/fork.c:1606 [inline] _do_fork+0x184/0xc80 kernel/fork.c:2092 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7fb180dec049 RSP: 002b:00007fb17f761118 EFLAGS: 00000206 ORIG_RAX: 0000000000000038 RAX: ffffffffffffffda RBX: 00007fb180efef60 RCX: 00007fb180dec049 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000041004200 RBP: 00007fb180e4608d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000 R13: 00007fffd746c04f R14: 00007fb17f761300 R15: 0000000000022000 INFO: task syz-executor.1:10278 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D29880 10278 7990 0x80000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 exp_funnel_lock kernel/rcu/tree_exp.h:295 [inline] _synchronize_rcu_expedited+0x5f6/0x770 kernel/rcu/tree_exp.h:596 synchronize_rcu+0x98/0x130 kernel/rcu/tree_plugin.h:762 kern_unmount fs/namespace.c:3369 [inline] kern_unmount+0x53/0xc0 fs/namespace.c:3364 put_ipc_ns.part.0+0x27/0x120 ipc/namespace.c:163 put_ipc_ns+0x2f/0x40 ipc/namespace.c:166 create_new_namespaces+0x4e2/0x720 kernel/nsproxy.c:122 unshare_nsproxy_namespaces+0xa1/0x1d0 kernel/nsproxy.c:206 SYSC_unshare kernel/fork.c:2413 [inline] SyS_unshare+0x308/0x7f0 kernel/fork.c:2363 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f1ffebdb049 RSP: 002b:00007f1ffd550168 EFLAGS: 00000246 ORIG_RAX: 0000000000000110 RAX: ffffffffffffffda RBX: 00007f1ffecedf60 RCX: 00007f1ffebdb049 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 000000006c060000 RBP: 00007f1ffec3508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca1f4738f R14: 00007f1ffd550300 R15: 0000000000022000 INFO: task syz-executor.1:10285 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.1 D25304 10285 7990 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline] _synchronize_rcu_expedited+0x32d/0x770 kernel/rcu/tree_exp.h:596 synchronize_net+0x2b/0x40 net/core/dev.c:8248 dev_deactivate_many+0x3cf/0x960 net/sched/sch_generic.c:936 __dev_close_many+0x11d/0x270 net/core/dev.c:1437 __dev_close net/core/dev.c:1462 [inline] __dev_change_flags+0x21f/0x540 net/core/dev.c:6800 dev_change_flags+0x7e/0x130 net/core/dev.c:6868 do_setlink+0x83f/0x2bf0 net/core/rtnetlink.c:2092 rtnl_setlink+0x1f5/0x2e0 net/core/rtnetlink.c:2324 rtnetlink_rcv_msg+0x3be/0xb10 net/core/rtnetlink.c:4322 netlink_rcv_skb+0x125/0x390 net/netlink/af_netlink.c:2446 netlink_unicast_kernel net/netlink/af_netlink.c:1294 [inline] netlink_unicast+0x437/0x610 net/netlink/af_netlink.c:1320 netlink_sendmsg+0x648/0xbc0 net/netlink/af_netlink.c:1891 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb5/0x100 net/socket.c:656 sock_write_iter+0x22c/0x370 net/socket.c:925 call_write_iter include/linux/fs.h:1780 [inline] do_iter_readv_writev+0x4cf/0x5f0 fs/read_write.c:675 do_iter_write+0x152/0x550 fs/read_write.c:954 vfs_writev+0x125/0x290 fs/read_write.c:999 do_writev+0xfc/0x2c0 fs/read_write.c:1034 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f1ffebdb049 RSP: 002b:00007f1ffd52f168 EFLAGS: 00000246 ORIG_RAX: 0000000000000014 RAX: ffffffffffffffda RBX: 00007f1ffecee030 RCX: 00007f1ffebdb049 RDX: 0000000000000001 RSI: 0000000020000180 RDI: 0000000000000006 RBP: 00007f1ffec3508d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffca1f4738f R14: 00007f1ffd52f300 R15: 0000000000022000 INFO: task syz-executor.0:10274 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.0 D28912 10274 7988 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 exp_funnel_lock kernel/rcu/tree_exp.h:295 [inline] _synchronize_rcu_expedited+0x5f6/0x770 kernel/rcu/tree_exp.h:596 synchronize_net+0x2b/0x40 net/core/dev.c:8248 packet_release+0x740/0xa80 net/packet/af_packet.c:3109 __sock_release+0xcd/0x2b0 net/socket.c:602 sock_close+0x15/0x20 net/socket.c:1139 __fput+0x25f/0x7a0 fs/file_table.c:210 task_work_run+0x11f/0x190 kernel/task_work.c:113 tracehook_notify_resume include/linux/tracehook.h:191 [inline] exit_to_usermode_loop+0x1ad/0x200 arch/x86/entry/common.c:164 prepare_exit_to_usermode arch/x86/entry/common.c:199 [inline] syscall_return_slowpath arch/x86/entry/common.c:270 [inline] do_syscall_64+0x4a3/0x640 arch/x86/entry/common.c:297 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f89e0550c8b RSP: 002b:00007fff02b80dd0 EFLAGS: 00000293 ORIG_RAX: 0000000000000003 RAX: 0000000000000000 RBX: 0000000000000004 RCX: 00007f89e0550c8b RDX: 0000000000000000 RSI: 0000001b2e821468 RDI: 0000000000000003 RBP: 00007f89e06b2960 R08: 0000000000000000 R09: 000000005290041d R10: 0000000000000000 R11: 0000000000000293 R12: 0000000000033249 R13: 00007fff02b80ed0 R14: 00007f89e06b1030 R15: 0000000000000032 INFO: task syz-executor.4:10309 blocked for more than 140 seconds. Not tainted 4.14.272-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. syz-executor.4 D30104 10309 7991 0x00000004 Call Trace: context_switch kernel/sched/core.c:2811 [inline] __schedule+0x88b/0x1de0 kernel/sched/core.c:3387 schedule+0x8d/0x1b0 kernel/sched/core.c:3431 schedule_preempt_disabled+0xf/0x20 kernel/sched/core.c:3489 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x669/0x1310 kernel/locking/mutex.c:893 dev_ioctl+0x214/0xbe0 net/core/dev_ioctl.c:565 sock_do_ioctl net/socket.c:981 [inline] sock_ioctl+0x164/0x4c0 net/socket.c:1071 vfs_ioctl fs/ioctl.c:46 [inline] file_ioctl fs/ioctl.c:500 [inline] do_vfs_ioctl+0x75a/0xff0 fs/ioctl.c:684 SYSC_ioctl fs/ioctl.c:701 [inline] SyS_ioctl+0x7f/0xb0 fs/ioctl.c:692 do_syscall_64+0x1d5/0x640 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x46/0xbb RIP: 0033:0x7f1a66e96049 RSP: 002b:00007f1a6580b168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f1a66fa8f60 RCX: 00007f1a66e96049 RDX: 0000000020000000 RSI: 0000000000008922 RDI: 0000000000000003 RBP: 00007f1a66ef008d R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fff01d7a00f R14: 00007f1a6580b300 R15: 0000000000022000 Showing all locks held in the system: 2 locks held by kworker/u4:2/33: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((reaper_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 2 locks held by kworker/u4:3/48: #0: ("events_unbound"){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: (connector_reaper_work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 1 lock held by khungtaskd/1533: #0: (tasklist_lock){.+.+}, at: [] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4548 3 locks held by kworker/0:4/9085: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [] process_one_work+0x6b0/0x14a0 kernel/workqueue.c:2088 #1: ((addr_chk_work).work){+.+.}, at: [] process_one_work+0x6e6/0x14a0 kernel/workqueue.c:2092 #2: (rtnl_mutex){+.+.}, at: [] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4416 1 lock held by syz-executor.2/10253: #0: (&table[i].mutex){+.+.}, at: [] nfnl_lock net/netfilter/nfnetlink.c:61 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_batch net/netfilter/nfnetlink.c:303 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv_skb_batch net/netfilter/nfnetlink.c:495 [inline] #0: (&table[i].mutex){+.+.}, at: [] nfnetlink_rcv+0x554/0x1da0 net/netfilter/nfnetlink.c:513 2 locks held by syz-executor.2/10265: #0: (&table[i].mutex){+.+.}, at: [] nf_tables_afinfo_lookup+0xf4/0x1d0 net/netfilter/nf_tables_api.c:87 #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] exp_funnel_lock kernel/rcu/tree_exp.h:272 [inline] #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] _synchronize_rcu_expedited+0x2c2/0x770 kernel/rcu/tree_exp.h:596 2 locks held by syz-executor.5/10266: #0: (net_mutex){+.+.}, at: [] copy_net_ns+0x156/0x440 net/core/net_namespace.c:413 #1: (&table[i].mutex){+.+.}, at: [] nft_register_afinfo+0x63/0x190 net/netfilter/nf_tables_api.c:39 2 locks held by syz-executor.1/10285: #0: (rtnl_mutex){+.+.}, at: [] rtnl_lock net/core/rtnetlink.c:72 [inline] #0: (rtnl_mutex){+.+.}, at: [] rtnetlink_rcv_msg+0x31d/0xb10 net/core/rtnetlink.c:4317 #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] exp_funnel_lock kernel/rcu/tree_exp.h:305 [inline] #1: (rcu_preempt_state.exp_mutex){+.+.}, at: [] _synchronize_rcu_expedited+0x32d/0x770 kernel/rcu/tree_exp.h:596 1 lock held by syz-executor.0/10274: #0: (&sb->s_type->i_mutex_key#13){+.+.}, at: [] inode_lock include/linux/fs.h:719 [inline] #0: (&sb->s_type->i_mutex_key#13){+.+.}, at: [] __sock_release+0x86/0x2b0 net/socket.c:601 1 lock held by syz-executor.4/10309: #0: (rtnl_mutex){+.+.}, at: [] dev_ioctl+0x214/0xbe0 net/core/dev_ioctl.c:565 ============================================= NMI backtrace for cpu 0 CPU: 0 PID: 1533 Comm: khungtaskd Not tainted 4.14.272-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0x1b2/0x281 lib/dump_stack.c:58 nmi_cpu_backtrace.cold+0x57/0x93 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x13a/0x180 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:140 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:195 [inline] watchdog+0x5b9/0xb40 kernel/hung_task.c:274 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 0 to CPUs 1: NMI backtrace for cpu 1 CPU: 1 PID: 8972 Comm: kworker/1:3 Not tainted 4.14.272-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events rtc_timer_do_work task: ffff888091eb4480 task.stack: ffff88808eea8000 RIP: 0010:__sanitizer_cov_trace_pc+0x9/0x50 kernel/kcov.c:65 RSP: 0018:ffff88808eeafbc0 EFLAGS: 00000297 RAX: ffff888091eb4480 RBX: ffff8882378caf38 RCX: 1ffff11046f195e7 RDX: 0000000000000000 RSI: ffff8882378caf38 RDI: ffff8882378caed8 RBP: ffff8882378caed8 R08: ffff8882378cae60 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: ffff8882378caf38 R13: ffff8882378caf50 R14: ffff8882378caf60 R15: ffffffff84b10ac0 FS: 0000000000000000(0000) GS:ffff8880ba500000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f29573c7000 CR3: 00000000b37a8000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: timerqueue_del+0xd/0xa0 lib/timerqueue.c:76 rtc_timer_do_work+0x194/0x5a0 drivers/rtc/interface.c:878 process_one_work+0x793/0x14a0 kernel/workqueue.c:2117 worker_thread+0x5cc/0xff0 kernel/workqueue.c:2251 kthread+0x30d/0x420 kernel/kthread.c:232 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:404 Code: 00 e9 9f fe ff ff 4c 89 e7 e8 04 b1 29 00 e9 2c fe ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 65 48 8b 04 25 c0 7f 02 00 <48> 85 c0 74 1a 65 8b 15 fb 3c ad 7e 81 e2 00 01 1f 00 75 0b 8b ---------------- Code disassembly (best guess), 1 bytes skipped: 0: e9 9f fe ff ff jmpq 0xfffffea4 5: 4c 89 e7 mov %r12,%rdi 8: e8 04 b1 29 00 callq 0x29b111 d: e9 2c fe ff ff jmpq 0xfffffe3e 12: 90 nop 13: 90 nop 14: 90 nop 15: 90 nop 16: 90 nop 17: 90 nop 18: 90 nop 19: 90 nop 1a: 90 nop 1b: 90 nop 1c: 90 nop 1d: 90 nop 1e: 90 nop 1f: 90 nop 20: 90 nop 21: 65 48 8b 04 25 c0 7f mov %gs:0x27fc0,%rax 28: 02 00 * 2a: 48 85 c0 test %rax,%rax <-- trapping instruction 2d: 74 1a je 0x49 2f: 65 8b 15 fb 3c ad 7e mov %gs:0x7ead3cfb(%rip),%edx # 0x7ead3d31 36: 81 e2 00 01 1f 00 and $0x1f0100,%edx 3c: 75 0b jne 0x49 3e: 8b .byte 0x8b