INFO: task syz.1.35753:829 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.35753     state:D stack:24528 pid:829   tgid:828   ppid:5813   task_flags:0x400140 flags:0x00080002
Call Trace:
 <TASK>
 __schedule+0x17e4/0x4de0
 schedule+0x164/0x360
 schedule_timeout+0xc3/0x2c0
 wait_for_completion+0x2cc/0x5e0
 disable_device+0x1c6/0x330
 __ib_unregister_device+0x2cb/0x3f0
 ib_unregister_device_and_put+0xb8/0xf0
 nldev_dellink+0x288/0x320
 rdma_nl_rcv+0x6d7/0xa10
 netlink_unicast+0x80f/0x9b0
 netlink_sendmsg+0x813/0xb40
 ____sys_sendmsg+0xa84/0xaf0
 ___sys_sendmsg+0x2a5/0x360
 __x64_sys_sendmsg+0x1bd/0x2a0
 do_syscall_64+0xf0/0xfa0
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7c2df9c819
RSP: 002b:00007f7c2ee6b028 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f7c2e215fa0 RCX: 00007f7c2df9c819
RDX: 0000000000000000 RSI: 00002000000002c0 RDI: 0000000000000008
RBP: 00007f7c2e032c91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7c2e216038 R14: 00007f7c2e215fa0 R15: 00007ffe9e978c48
 </TASK>

Showing all locks held in the system:
4 locks held by kworker/u8:0/12:
 #0: ffff888100ef7948 ((wq_completion)netns){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17d0
 #1: ffffc90000117ba0 (net_cleanup_work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17d0
 #2: ffffffff8f6ccad0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xfe/0x820
 #3: ffff8881139e0700 (&device->unregistration_lock){+.+.}-{4:4}, at: rdma_dev_change_netns+0x39/0x300
1 lock held by khungtaskd/34:
 #0: ffffffff8e33eba0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by getty/5633:
 #0: ffff8881748510a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc9000357b2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45f/0x14a0
1 lock held by syz-executor/5776:
 #0: ffff88823c63a058 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140
3 locks held by kworker/u9:33/13038:
 #0: ffff888100089948 ((wq_completion)events_unbound#2){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17d0
 #1: ffffc9000ab77ba0 ((linkwatch_work).work){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17d0
 #2: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
3 locks held by kworker/u8:1/18808:
 #0: ffff8881740f2948 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_scheduled_works+0x9d4/0x17d0
 #1: ffffc9000890fba0 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_scheduled_works+0xa0f/0x17d0
 #2: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x11e/0x14c0
2 locks held by syz.1.35753/829:
 #0: ffffffff99fc5ed8 (&rdma_nl_types[idx].sem){.+.+}-{4:4}, at: rdma_nl_rcv+0x32b/0xa10
 #1: ffff8881139e0700 (&device->unregistration_lock){+.+.}-{4:4}, at: __ib_unregister_device+0x284/0x3f0
1 lock held by syz.3.37533/7130:
 #0: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0
1 lock held by syz.2.37540/7168:
 #0: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: rtnetlink_rcv_msg+0x722/0xbe0
2 locks held by syz.0.37541/7171:
 #0: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: tc_new_tfilter+0x4ff/0x1630
 #1: ffffffff8e344638 (rcu_state.exp_mutex){+.+.}-{4:4}, at: synchronize_rcu_expedited+0x32f/0x7e0
1 lock held by syz.0.37541/7172:
 #0: ffffffff8f6d98c8 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x3e/0x1c0

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

NMI backtrace for cpu 0
CPU: 0 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+0x1a9/0x280
 nmi_cpu_backtrace+0x3a9/0x3e0
 nmi_trigger_cpumask_backtrace+0x17a/0x300
 watchdog+0xf5b/0xfa0
 kthread+0x726/0x8b0
 ret_from_fork+0x4d3/0x870
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 0 Comm: swapper/1 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
RIP: 0010:native_apic_msr_write+0x39/0x50
Code: 74 2a 83 ff 30 74 25 eb 10 81 ff d0 00 00 00 74 1b 81 ff e0 00 00 00 74 13 c1 ef 04 81 c7 00 08 00 00 89 f9 89 f0 31 d2 0f 30 <66> 90 e9 90 56 10 0a cc 89 f6 31 d2 e9 86 e1 64 03 66 0f 1f 44 00
RSP: 0018:ffffc90000a08e48 EFLAGS: 00000046
RAX: 000000000000ecdf RBX: ffff88823c623900 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000000ecdf RDI: 0000000000000838
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffffff81b0f5a5
R10: 0000000000000003 R11: ffffffff81728470 R12: 000000000fff83d9
R13: dffffc0000000000 R14: 000000000000ecdf R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff8882a9adc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f59c17e9f00 CR3: 00000001908d2000 CR4: 00000000000006f0
Call Trace:
 <IRQ>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x1cf/0x360
 hrtimer_interrupt+0xb08/0x1010
 __sysvec_apic_timer_interrupt+0x10b/0x400
 sysvec_apic_timer_interrupt+0xa1/0xc0
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:pv_native_safe_halt+0xf/0x20
Code: 37 5d 02 e9 03 ed 02 00 cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa eb 07 0f 00 2d c3 1d 27 00 fb f4 <c3> cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90
RSP: 0018:ffffc90000197de0 EFLAGS: 00000286
RAX: 95903984ec8a3b00 RBX: ffffffff8198cb6b RCX: 95903984ec8a3b00
RDX: 0000000000000001 RSI: ffffffff8db33656 RDI: ffffffff8bff20e0
RBP: ffffc90000197f10 R08: ffff88823c632fdb R09: 1ffff110478c65fb
R10: dffffc0000000000 R11: ffffed10478c65fc R12: 1ffff1102c1d3000
R13: 1ffff92000032fc8 R14: 0000000000000001 R15: dffffc0000000000
 default_idle+0x9/0x20
 default_idle_call+0x72/0xb0
 do_idle+0x1eb/0x4e0
 cpu_startup_entry+0x43/0x60
 start_secondary+0x101/0x110
 common_startup_64+0x13e/0x147
 </TASK>
