INFO: task kworker/0:1:22 blocked for more than 140 seconds. Not tainted 4.14.149+ #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. kworker/0:1 D27344 22 2 0x80000000 Workqueue: ipv6_addrconf addrconf_verify_work Call Trace: schedule+0x92/0x1c0 kernel/sched/core.c:3498 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3556 __mutex_lock_common kernel/locking/mutex.c:833 [inline] __mutex_lock+0x595/0x13e0 kernel/locking/mutex.c:893 addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431 process_one_work+0x7f1/0x1580 kernel/workqueue.c:2134 worker_thread+0xdd/0xdf0 kernel/workqueue.c:2271 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Showing all locks held in the system: 3 locks held by kworker/0:1/22: #0: ("%s"("ipv6_addrconf")){+.+.}, at: [< (ptrval)>] process_one_work+0x6ff/0x1580 kernel/workqueue.c:2105 #1: ((addr_chk_work).work){+.+.}, at: [< (ptrval)>] process_one_work+0x735/0x1580 kernel/workqueue.c:2109 #2: (rtnl_mutex){+.+.}, at: [< (ptrval)>] addrconf_verify_work+0xa/0x20 net/ipv6/addrconf.c:4431 1 lock held by khungtaskd/23: #0: (tasklist_lock){.+.+}, at: [< (ptrval)>] debug_show_all_locks+0x7c/0x21a kernel/locking/lockdep.c:4544 2 locks held by getty/1756: #0: (&tty->ldisc_sem){++++}, at: [< (ptrval)>] tty_ldisc_ref_wait+0x22/0x80 drivers/tty/tty_ldisc.c:284 #1: (&ldata->atomic_read_lock){+.+.}, at: [< (ptrval)>] n_tty_read+0x1f7/0x1700 drivers/tty/n_tty.c:2156 ============================================= NMI backtrace for cpu 1 CPU: 1 PID: 23 Comm: khungtaskd Not tainted 4.14.149+ #0 Call Trace: __dump_stack lib/dump_stack.c:17 [inline] dump_stack+0xca/0x134 lib/dump_stack.c:53 nmi_cpu_backtrace.cold+0x47/0x86 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x119/0x147 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+0x629/0xbe0 kernel/hung_task.c:274 kthread+0x31f/0x430 kernel/kthread.c:232 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:404 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 PID: 1910 Comm: syz-executor432 Not tainted 4.14.149+ #0 task: (ptrval) task.stack: (ptrval) RIP: 0010:unwind_next_frame+0x101/0x1810 arch/x86/kernel/unwind_orc.c:339 RSP: 0018:ffff8881c9e070b0 EFLAGS: 00000246 RAX: ffff8881c9e071d0 RBX: ffff8881c9e07180 RCX: 0000000000000000 RDX: ffff8881c9e071d0 RSI: 0000000000000000 RDI: ffff8881cb619128 RBP: 1ffff110393c0e1d R08: 0000000000000001 R09: ffff8881c9e07a58 R10: ffff8881c9e071b5 R11: 000000000001c033 R12: 0000000000000000 R13: ffff8881c9e071b8 R14: ffff8881cb618000 R15: 0000000000000001 FS: 0000000000c91880(0000) GS:ffff8881dba00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000abe000 CR3: 00000001caefa002 CR4: 00000000001606b0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: __save_stack_trace+0x7a/0xf0 arch/x86/kernel/stacktrace.c:44 save_stack mm/kasan/common.c:76 [inline] set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc.part.0+0x53/0xc0 mm/kasan/common.c:501 slab_post_alloc_hook mm/slab.h:439 [inline] slab_alloc_node mm/slub.c:2792 [inline] slab_alloc mm/slub.c:2800 [inline] __kmalloc_track_caller+0x10d/0x390 mm/slub.c:4367 __kmalloc_reserve.isra.0+0x2d/0xc0 net/core/skbuff.c:137 pskb_expand_head+0x11e/0xc10 net/core/skbuff.c:1462 netlink_trim+0x1f6/0x270 net/netlink/af_netlink.c:1268 netlink_broadcast_filtered+0x5f/0xa00 net/netlink/af_netlink.c:1465 netlink_broadcast+0x35/0x40 net/netlink/af_netlink.c:1510 rtnetlink_send+0xcb/0x100 net/core/rtnetlink.c:630 tcf_add_notify net/sched/act_api.c:1065 [inline] tcf_action_add net/sched/act_api.c:1082 [inline] tc_ctl_action+0x420/0x526 net/sched/act_api.c:1126 rtnetlink_rcv_msg+0x3d3/0xb40 net/core/rtnetlink.c:4285 netlink_rcv_skb+0x137/0x3a0 net/netlink/af_netlink.c:2432 netlink_unicast_kernel net/netlink/af_netlink.c:1286 [inline] netlink_unicast+0x478/0x650 net/netlink/af_netlink.c:1312 netlink_sendmsg+0x66a/0xbe0 net/netlink/af_netlink.c:1877 sock_sendmsg_nosec net/socket.c:646 [inline] sock_sendmsg+0xb7/0x100 net/socket.c:656 ___sys_sendmsg+0x752/0x890 net/socket.c:2062 __sys_sendmsg+0xb6/0x150 net/socket.c:2096 SYSC_sendmsg net/socket.c:2107 [inline] SyS_sendmsg+0x27/0x40 net/socket.c:2103 do_syscall_64+0x19b/0x520 arch/x86/entry/common.c:292 entry_SYSCALL_64_after_hwframe+0x42/0xb7 RIP: 0033:0x441799 RSP: 002b:00007ffc5183eb18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000441799 RDX: 0000000020000010 RSI: 0000000020001480 RDI: 0000000000000003 RBP: 00000000006cc018 R08: 00000000004002c8 R09: 00000000004002c8 R10: 0000000000000004 R11: 0000000000000246 R12: 00000000004025c0 R13: 0000000000402650 R14: 0000000000000000 R15: 0000000000000000 Code: c1 ea 03 80 3c 02 00 0f 85 08 11 00 00 48 8b 43 38 bf 01 00 00 00 48 89 44 24 08 e8 9a 73 0b 00 48 8d 43 50 48 89 c2 48 89 04 24 <48> b8 00 00 00 00 00 fc ff df 48 c1 ea 03 80 3c 02 00 0f 85 df