INFO: task kworker/u4:5:3038 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc3+ #125
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
kworker/u4:5    D26576  3038      2 0x80004000
Workqueue: netns cleanup_net
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 exp_funnel_lock kernel/rcu/tree_exp.h:308 [inline]
 synchronize_rcu_expedited+0x544/0x5b0 kernel/rcu/tree_exp.h:816
 synchronize_net+0x3b/0x60 net/core/dev.c:9302
 rollback_registered_many+0x595/0xdf0 net/core/dev.c:8226
 unregister_netdevice_many.part.0+0x1b/0x1f0 net/core/dev.c:9347
 unregister_netdevice_many+0x3b/0x50 net/core/dev.c:9346
 ip_tunnel_delete_nets+0x41e/0x5f0 net/ipv4/ip_tunnel.c:1113
 ipip_exit_batch_net+0x23/0x30 net/ipv4/ipip.c:661
 ops_exit_list.isra.0+0xfc/0x150 net/core/net_namespace.c:175
 cleanup_net+0x4e2/0xa70 net/core/net_namespace.c:594
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
INFO: task syz-executor.2:13526 blocked for more than 143 seconds.
      Not tainted 5.3.0-rc3+ #125
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
syz-executor.2  D29496 13526  10402 0x00000004
Call Trace:
 context_switch kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 kernel/sched/core.c:3880
 schedule+0xa8/0x270 kernel/sched/core.c:3944
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:4003
 __mutex_lock_common kernel/locking/mutex.c:1007 [inline]
 __mutex_lock+0x7b0/0x13c0 kernel/locking/mutex.c:1077
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1092
 rtnl_lock+0x17/0x20 net/core/rtnetlink.c:72
 prb_calc_retire_blk_tmo net/packet/af_packet.c:527 [inline]
 init_prb_bdqc net/packet/af_packet.c:590 [inline]
 packet_set_ring+0x1662/0x1b60 net/packet/af_packet.c:4336
 packet_setsockopt+0x530/0x2df0 net/packet/af_packet.c:3682
 __sys_setsockopt+0x261/0x4c0 net/socket.c:2084
 __do_sys_setsockopt net/socket.c:2100 [inline]
 __se_sys_setsockopt net/socket.c:2097 [inline]
 __x64_sys_setsockopt+0xbe/0x150 net/socket.c:2097
 do_syscall_64+0xfd/0x6a0 arch/x86/entry/common.c:296
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459829
Code: 24 60 48 8b 42 08 48 8b 4a 10 48 8b 5a 18 48 8b 72 20 48 8b 7a 28 48 8b 3f 4c 8b 42 30 48 8b 52 38 48 85 d2 76 62 48 89 44 24 <58> 4c 89 44 24 28 48 89 0c 24 48 89 5c 24 08 48 c7 44 24 10 00 00
RSP: 002b:00007f3667562c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000000005 RCX: 0000000000459829
RDX: 0000000000000005 RSI: 0000000000000107 RDI: 0000000000000004
RBP: 000000000075bf20 R08: 000000000000001c R09: 0000000000000000
R10: 00000000200001c0 R11: 0000000000000246 R12: 00007f36675636d4
R13: 00000000004c8250 R14: 00000000004deb90 R15: 00000000ffffffff
INFO: lockdep is turned off.
NMI backtrace for cpu 1
CPU: 1 PID: 1057 Comm: khungtaskd Not tainted 5.3.0-rc3+ #125
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_all_cpu_backtrace include/linux/nmi.h:146 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:205 [inline]
 watchdog+0x9d0/0xef0 kernel/hung_task.c:289
 kthread+0x361/0x430 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Sending NMI from CPU 1 to CPUs 0:
protocol 88fb is buggy, dev hsr_slave_0
NMI backtrace for cpu 0
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0-rc3+ #125
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_serial_in+0x6b/0x90 drivers/tty/serial/8250/8250_port.c:450
Code: e9 00 00 00 49 8d 7c 24 38 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 d3 e3 80 3c 02 00 75 17 41 03 5c 24 38 89 da ec <5b> 0f b6 c0 41 5c 5d c3 e8 f8 2d 25 fe eb c2 e8 51 2e 25 fe eb e2
RSP: 0018:ffff8880ae8094a8 EFLAGS: 00000002
RAX: dffffc0000000000 RBX: 00000000000003fd RCX: 0000000000000000
RDX: 00000000000003fd RSI: ffffffff83877371 RDI: ffffffff8b2c1cb8
RBP: ffff8880ae8094b8 R08: ffffffff88c7a1c0 R09: ffffed1015d0129c
R10: ffffed1015d0129b R11: 0000000000000003 R12: ffffffff8b2c1c80
R13: 0000000000000020 R14: 0000000000000000 R15: fffffbfff1658399
FS:  0000000000000000(0000) GS:ffff8880ae800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcd62e2e140 CR3: 00000000917d0000 CR4: 00000000001406f0
Call Trace:
 <IRQ>
 serial_in drivers/tty/serial/8250/8250.h:113 [inline]
 wait_for_xmitr+0xa1/0x230 drivers/tty/serial/8250/8250_port.c:2012
 serial8250_console_putchar+0x1f/0x60 drivers/tty/serial/8250/8250_port.c:3183
 uart_console_write+0x54/0x110 drivers/tty/serial/serial_core.c:1923
 serial8250_console_write+0x612/0x9a0 drivers/tty/serial/8250/8250_port.c:3247
 univ8250_console_write+0x5f/0x70 drivers/tty/serial/8250/8250_core.c:587
 call_console_drivers kernel/printk/printk.c:1781 [inline]
 console_unlock+0xb89/0xf10 kernel/printk/printk.c:2463
 vprintk_emit+0x2a0/0x700 kernel/printk/printk.c:1986
 vprintk_default+0x28/0x30 kernel/printk/printk.c:2013
 vprintk_func+0x7e/0x189 kernel/printk/printk_safe.c:386
 printk+0xba/0xed kernel/printk/printk.c:2046
 dev_queue_xmit_nit.cold+0x3f/0x4b net/core/dev.c:2059
 xmit_one net/core/dev.c:3276 [inline]
 dev_hard_start_xmit+0xbb/0x9c0 net/core/dev.c:3296
 __dev_queue_xmit+0x2b15/0x3650 net/core/dev.c:3869
 dev_queue_xmit+0x18/0x20 net/core/dev.c:3902
 hsr_xmit net/hsr/hsr_forward.c:228 [inline]
 hsr_forward_do net/hsr/hsr_forward.c:285 [inline]
 hsr_forward_skb+0xd29/0x1d30 net/hsr/hsr_forward.c:361
 send_hsr_supervision_frame+0x8bf/0xf20 net/hsr/hsr_device.c:306
 hsr_announce+0x12f/0x3b0 net/hsr/hsr_device.c:334
 call_timer_fn+0x1ac/0x780 kernel/time/timer.c:1322
 expire_timers kernel/time/timer.c:1366 [inline]
 __run_timers kernel/time/timer.c:1685 [inline]
 __run_timers kernel/time/timer.c:1653 [inline]
 run_timer_softirq+0x697/0x17a0 kernel/time/timer.c:1698
 __do_softirq+0x262/0x98c kernel/softirq.c:292
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x19b/0x1e0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:537 [inline]
 smp_apic_timer_interrupt+0x1a3/0x610 arch/x86/kernel/apic/apic.c:1095
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830
 </IRQ>
RIP: 0010:native_safe_halt+0xe/0x10 arch/x86/include/asm/irqflags.h:61
Code: d8 46 6e fa eb 8a 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d b4 cd 49 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d a4 cd 49 00 fb f4 <c3> 90 55 48 89 e5 41 57 41 56 41 55 41 54 53 e8 ae fc 21 fa e8 e9
RSP: 0018:ffffffff88c07ce8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e65 RBX: ffffffff88c7a1c0 RCX: 1ffffffff134b686
RDX: dffffc0000000000 RSI: ffffffff817805de RDI: ffffffff873e507c
RBP: ffffffff88c07d18 R08: ffffffff88c7a1c0 R09: fffffbfff118f439
R10: fffffbfff118f438 R11: ffffffff88c7a1c7 R12: dffffc0000000000
R13: ffffffff89a58238 R14: 0000000000000000 R15: 0000000000000000
 arch_cpu_idle+0xa/0x10 arch/x86/kernel/process.c:571
 default_idle_call+0x84/0xb0 kernel/sched/idle.c:94
 cpuidle_idle_call kernel/sched/idle.c:154 [inline]
 do_idle+0x413/0x760 kernel/sched/idle.c:263
 cpu_startup_entry+0x1b/0x20 kernel/sched/idle.c:354
 rest_init+0x245/0x37b init/main.c:451
 arch_call_rest_init+0xe/0x1b
 start_kernel+0x912/0x951 init/main.c:785
 x86_64_start_reservations+0x29/0x2b arch/x86/kernel/head64.c:472
 x86_64_start_kernel+0x77/0x7b arch/x86/kernel/head64.c:453
 secondary_startup_64+0xa4/0xb0 arch/x86/kernel/head_64.S:241