INFO: task syz.0.16379:6600 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.16379     state:D stack:27016 pid:6600  tgid:6597  ppid:5822   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x15dd/0x52d0
 schedule+0x164/0x360
 schedule_preempt_disabled+0x13/0x30
 __mutex_lock+0x7fe/0x1300
 nfsd_nl_listener_set_doit+0x141/0x1670
 genl_family_rcv_msg_doit+0x22a/0x330
 genl_rcv_msg+0x61c/0x7a0
 netlink_rcv_skb+0x232/0x4b0
 genl_rcv+0x28/0x40
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0x972/0x9f0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0x14d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f37fe59cdd9
RSP: 002b:00007f37fc7d5028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f37fe816180 RCX: 00007f37fe59cdd9
RDX: 0000000000000000 RSI: 00002000000001c0 RDI: 0000000000000034
RBP: 00007f37fe632d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f37fe816218 R14: 00007f37fe816180 R15: 00007fff164a7288
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/34:
 #0: ffffffff8e75e5e0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
3 locks held by kworker/1:3/5275:
 #0: ffff88810006b148 ((wq_completion)events){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90003217c40 ((work_completion)(&data->fib_event_work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff888185bd9240 (&data->fib_lock){+.+.}-{4:4}, at: nsim_fib_event_work+0x202/0x3d0
2 locks held by getty/5634:
 #0: ffff888112cba0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000356e2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13c0
4 locks held by kworker/0:5/5878:
 #0: ffff8881072a6d48 ((wq_completion)infiniband){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006c7fc40 ((work_completion)(&work->work)#2){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffff88802b70d2f0 (&rxe->usdev_lock){+.+.}-{4:4}, at: rxe_query_port+0x7e/0x3d0
 #3: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: ib_get_eth_speed+0x173/0x7f0
3 locks held by kworker/u8:5/7092:
 #0: ffff88811375c948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc90006d5fc40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
5 locks held by kworker/u9:31/16547:
3 locks held by kworker/0:0/10105:
 #0: ffff8881072a6d48 ((wq_completion)infiniband){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9000a07fc40 ((work_completion)(&work->work)#2){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: ib_get_eth_speed+0x173/0x7f0
3 locks held by kworker/u10:1/18187:
 #0: ffff8881000ac148 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_scheduled_works+0xa52/0x18c0
 #1: ffffc9002ce0fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa8d/0x18c0
 #2: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}
, at: linkwatch_event+0xe/0x60
2 locks held by syz.1.15789/3908:
 #0: ffffffff8fc3ea70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ea86b88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x141/0x1670
2 locks held by syz.0.16379/6600:
 #0: ffffffff8fc3ea70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8ea86b88 (nfsd_mutex){+.+.}-{4:4}, at: nfsd_nl_listener_set_doit+0x141/0x1670
2 locks held by syz.4.17284/10560:
 #0: ffffffff8fbc2530 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d7/0x840
2 locks held by syz.2.17287/10581:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_newlink+0x883/0x1bb0
 #1: ffffffff8e7648f8 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x38d/0x770
1 lock held by syz.3.17289/10585:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: __tun_chr_ioctl+0x3bc/0x1e10
1 lock held by syz.3.17289/10586:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
3 locks held by syz.3.17289/10587:
 #0: 
ffffffff8fc3ea70
 (
cb_lock
){++++}-{4:4}
, at: genl_rcv+0x19/0x40
 #1: ffffffff8fc3e888 (
genl_mutex
){+.+.}-{4:4}
, at: genl_rcv_msg+0x10b/0x7a0
 #2: 
ffffffff8fbd0cc8
 (
rtnl_mutex
){+.+.}-{4:4}
, at: tipc_nl_compat_doit+0x22a/0x650
1 lock held by syz.3.17289/10588:
 #0: 
ffffffff8fbd0cc8
 (
rtnl_mutex
){+.+.}-{4:4}
, at: dev_ioctl+0x7a4/0x1150
1 lock held by syz.3.17289/10591:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
2 locks held by syz.3.17289/10592:
 #0: ffffffff8fc3ea70 (cb_lock){++++}-{4:4}, at: genl_rcv+0x19/0x40
 #1: ffffffff8fc3e888 (genl_mutex){+.+.}-{4:4}, at: genl_rcv_msg+0x10b/0x7a0
1 lock held by syz.3.17289/10593:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x722/0xbe0
1 lock held by syz.3.17289/10596:
 #0: ffffffff8fbd0cc8 (rtnl_mutex){+.+.}-{4:4}
, at: rtnetlink_rcv_msg+0x722/0xbe0

=============================================

NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 34 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 nmi_cpu_backtrace+0x274/0x2d0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 sys_info+0x135/0x170
 watchdog+0xfd9/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 6142 Comm: kworker/u9:49 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: xprtiod xs_tcp_setup_socket
RIP: 0010:preempt_count_sub+0x5/0x170
Code: ff ff ff 48 c7 c7 c4 0f 12 90 e8 c6 1e 9c 00 e9 62 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 55 <53> 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 80 24 28 9a 48 c1 e8 03
RSP: 0018:ffffc90000007d18 EFLAGS: 00000046
RAX: 0000000000000046 RBX: 0000000000000096 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 0000000000000001
RBP: ffffc90000007e88 R08: ffffffff9a4f2693 R09: 1ffffffff349e4d2
R10: dffffc0000000000 R11: fffffbfff349e4d3 R12: ffffc90006697d40
R13: dffffc0000000000 R14: ffffffff9a4f2690 R15: ffff888121028300
FS:  0000000000000000(0000) GS:ffff88818de54000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6149b84440 CR3: 0000000184b8a000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 _raw_spin_unlock_irqrestore+0x4c/0x80
 __hrtimer_run_queues+0x2c5/0xcc0
 hrtimer_interrupt+0x447/0x1050
 __sysvec_apic_timer_interrupt+0x102/0x460
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:vprintk_emit+0x45d/0x560
Code: 0f 84 44 ff ff ff e8 92 43 21 00 fb eb 44 e8 8a 43 21 00 e8 55 52 0b 0a 4d 85 f6 74 94 e8 7b 43 21 00 fb 48 c7 c7 00 0a 75 8e <31> f6 ba 01 00 00 00 31 c9 41 b8 01 00 00 00 45 31 c9 53 e8 6b 16
RSP: 0018:ffffc900091af880 EFLAGS: 00000293
RAX: ffffffff81a49045 RBX: ffffffff81a48ebf RCX: ffff88802a37d7c0
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8e750a00
RBP: ffffc900091af930 R08: ffffffff9011dcb7 R09: 1ffffffff2023b96
R10: dffffc0000000000 R11: fffffbfff2023b97 R12: 0000000000000000
R13: 0000000000000039 R14: 0000000000000200 R15: 1ffff92001235f14
 _printk+0xdd/0x130
 xs_tcp_setup_socket+0xa63/0xc10
 process_scheduled_works+0xb6e/0x18c0
 worker_thread+0xa53/0xfc0
 kthread+0x388/0x470
 ret_from_fork+0x51e/0xb90
 ret_from_fork_asm+0x1a/0x30
 </TASK>
