INFO: task syz.4.21558:29610 blocked for more than 143 seconds.
      Tainted: G             L      syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.4.21558     state:D stack:24632 pid:29610 tgid:29609 ppid:24770  task_flags:0x400140 flags:0x00080802
Call Trace:
 <TASK>
 __schedule+0x16f9/0x5500
 rt_mutex_schedule+0x76/0xf0
 __rt_mutex_slowlock_locked+0x1f28/0x2550
 __rwbase_read_lock+0xc3/0x180
 down_read+0x132/0x200
 super_lock+0x2d6/0x3d0
 __iterate_supers+0x126/0x250
 __ia32_sys_sync+0xa0/0x120
 do_syscall_64+0x15f/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f7ee946cdd9
RSP: 002b:00007f7ee76c6028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f7ee96e5fa0 RCX: 00007f7ee946cdd9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f7ee96e5fa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7ee96e6038 R14: 00007f7ee96e5fa0 R15: 00007ffe5d6a9398
 </TASK>

Showing all locks held in the system:
5 locks held by ktimers/1/30:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
 #1: ffffffff997fa5c8 (&____s->seqcount#2){--..}-{0:0}, at: __local_bh_disable_ip+0x3c/0x420
 #2: ffff88823c628438 (_T->lock){....}-{2:2}, at: net_tx_action+0x5b6/0xc30
 #3: ffff88816f0fa1f0 (_T->lock){....}-{2:2}, at: rt_mutex_slowunlock+0xbf/0x8b0
 #4: ffff88823c6283d8 (hrtimer_bases.lock){-...}-{2:2}, at: __hrtimer_run_queues+0x4b1/0xb10
1 lock held by khungtaskd/42:
 #0: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180
2 locks held by dhcpcd/5335:
 #0: ffff88811b792928 (nlk_cb_mutex-ROUTE){+.+.}-{4:4}, at: __netlink_dump_start+0xfe/0x7e0
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_dumpit+0x92/0x200
2 locks held by getty/5418:
 #0: ffff88810cf730a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70
 #1: ffffc90003f062e0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x462/0x13a0
3 locks held by kworker/u8:2/26364:
 #0: ffff888176605938 ((wq_completion)ipv6_addrconf){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900268cfc40 ((work_completion)(&(&ifa->dad_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: addrconf_dad_work+0x124/0x1680
6 locks held by kworker/u8:7/8502:
 #0: ffff8881012ad938 ((wq_completion)netns){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900218c7c40 (net_cleanup_work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: cleanup_net+0xf4/0x800
 #3: ffff88811222d160 (&dev->mutex){....}-{4:4}, at: devlink_pernet_pre_exit+0x129/0x420
 #4: ffff888115d26310 (&devlink->lock_key#15){+.+.}-{4:4}, at: devlink_pernet_pre_exit+0x142/0x420
 #5: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: nsim_create+0x894/0x1170
3 locks held by kworker/u9:14/8746:
 #0: ffff8881000ac138 ((wq_completion)events_unbound){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc9000b05fc40 ((linkwatch_work).work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: linkwatch_event+0xe/0x60
3 locks held by kworker/1:6/11488:
 #0: ffff88810006e538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc900095ffc40 ((work_completion)(&(&gc_work->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: gc_worker+0x265/0x12e0
4 locks held by kworker/1:2/27633:
 #0: ffff88810006e538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc90007c57c40 ((work_completion)(&(&tbl->gc_work)->work)){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8de5f380 (local_bh){.+.+}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
 #3: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: __local_bh_disable_ip+0x3c/0x420
1 lock held by syz.3.21301/28682:
 #0: ffff88816ab1c0d0 (&type->s_umount_key#60){++++}-{4:4}, at: deactivate_super+0xa9/0xe0
4 locks held by kworker/1:11/28752:
 #0: ffff88810006e538 ((wq_completion)events_power_efficient){+.+.}-{0:0}, at: process_one_work+0x897/0x1630
 #1: ffffc90009377c40 ((gc_work).work){+.+.}-{0:0}, at: process_one_work+0x8be/0x1630
 #2: ffffffff8eab45f8 ("ratelimiter_table_lock"){+.+.}-{3:3}, at: wg_ratelimiter_gc_entries+0x5d/0x480
 #3: ffffffff8dfc8240 (rcu_read_lock){....}-{1:3}, at: rt_spin_lock+0x1e0/0x400
1 lock held by syz.4.21558/29610:
 #0: ffff88816ab1c0d0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
3 locks held by syz.5.21573/29763:
 #0: ffff88810ebbd128 (&f->f_pos_lock){+.+.}-{4:4}, at: fdget_pos+0x252/0x320
 #1: ffff88812005a480 (sb_writers#3){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0
 #2: ffff88816ab1c0d0 (&type->s_umount_key#60){++++}-{4:4}, at: super_lock+0x2d6/0x3d0
1 lock held by syz-executor/29882:
 #0: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: tun_chr_close+0x41/0x1c0
7 locks held by syz-executor/29925:
 #0: ffff88810d37e480 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0
 #1: ffff888110ecd878 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1df/0x540
 #2: ffff88816e044008 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x540
 #3: ffffffff8ebe8758 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
 #4: ffff88802022b160 (&dev->mutex){....}-{4:4}, at: device_release_driver_internal+0xb6/0x870
 #5: ffff88811faf6310 (&devlink->lock_key#17){+.+.}-{4:4}, at: nsim_drv_remove+0x50/0x160
 #6: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_net_dev_lock+0x257/0x2f0
4 locks held by syz-executor/29947:
 #0: ffff88810d37e480 (sb_writers#7){.+.+}-{0:0}, at: vfs_write+0x22d/0xba0
 #1: ffff888177898078 (&of->mutex){+.+.}-{4:4}, at: kernfs_fop_write_iter+0x1df/0x540
 #2: ffff88816e044008 (kn->active#48){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x232/0x540
 #3: ffffffff8ebe8758 (nsim_bus_dev_list_lock){+.+.}-{4:4}, at: del_device_store+0xd7/0x370
2 locks held by syz-executor/30031:
 #0: ffffffff8f362ac0 (pernet_ops_rwsem){++++}-{4:4}, at: copy_net_ns+0x4f7/0x730
 #1: ffffffff8f371f78 (rtnl_mutex){+.+.}-{4:4}, at: ip_tunnel_init_net+0x2d7/0x840

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

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 42 Comm: khungtaskd Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
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+0xfd3/0x1030
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 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: 30 Comm: ktimers/1 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
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 40 df b6 09 cc 89 f6 31 d2 e9 56 18 73 03 66 0f 1f 44 00
RSP: 0000:ffffc90000a4fa70 EFLAGS: 00000046
RAX: 000000000003c8c5 RBX: ffff88823c623c40 RCX: 0000000000000838
RDX: 0000000000000000 RSI: 000000000003c8c5 RDI: 0000000000000838
RBP: ffffc90000a4fb28 R08: 0000000000000000 R09: 0000000000000100
R10: 0000000000000100 R11: ffffffff81744440 R12: 000000000003c8c5
R13: dffffc0000000000 R14: 000000000ffffaf7 R15: 0000000000000020
FS:  0000000000000000(0000) GS:ffff8882a9f1f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fdf5ebeeff8 CR3: 000000000ddb6000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 lapic_next_event+0x11/0x20
 clockevents_program_event+0x385/0x630
 __hrtimer_rearm_deferred+0x273/0x460
 irqentry_exit+0x6d5/0x760
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:_raw_spin_unlock_irqrestore+0x47/0x80
Code: f7 e8 4d 12 75 f6 f7 c3 00 02 00 00 74 05 e8 90 ed a0 f6 9c 58 a9 00 02 00 00 75 27 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a4 9f 67 f6 65 8b 05 cd ff 43 07 85 c0 74 18 5b 41 5e c3 cc cc
RSP: 0000:ffffc90000a4fc80 EFLAGS: 00000206
RAX: 0000000000000006 RBX: 0000000000000246 RCX: 0000000080000001
RDX: 0000000000000002 RSI: ffffffff8d626fd7 RDI: 0000000000000001
RBP: ffff88823c628668 R08: ffffffff8f8acbf7 R09: 1ffffffff1f1597e
R10: dffffc0000000000 R11: fffffbfff1f1597f R12: 7fffffffffffffff
R13: 0000000000000246 R14: ffff88823c6283c0 R15: dffffc0000000000
 hrtimer_run_softirq+0x212/0x260
 handle_softirqs+0x1de/0x6d0
 run_ktimerd+0x69/0x100
 smpboot_thread_fn+0x541/0xa50
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
