======================================
| [ 213.166038][ T1827] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
| [  213.166231][ T1827]
| [  213.166322][ T1827]
| [  213.166322][ T1827] stack backtrace:
[  213.166746][ T1827] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  213.167090][ T1827] Call Trace:
[  213.167233][ T1827]  <TASK>
[ 213.167325][ T1827] dump_stack_lvl (lib/dump_stack.c:117) 
[ 213.167506][ T1827] print_bad_irq_dependency (kernel/locking/lockdep.c:2626) 
[ 213.167666][ T1827] ? __pfx_print_bad_irq_dependency (kernel/locking/lockdep.c:2569) 
[ 213.167874][ T1827] ? __pfx_usage_skip (kernel/locking/lockdep.c:2264) 
[ 213.168021][ T1827] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 213.168154][ T1827] ? __pfx_usage_match (kernel/locking/lockdep.c:2256) 
[ 213.168310][ T1827] check_irq_usage (kernel/locking/lockdep.c:2871) 
[ 213.168456][ T1827] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 213.168627][ T1827] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 213.168786][ T1827] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2790) 
[ 213.168941][ T1827] ? __bfs (kernel/locking/lockdep.c:1787) 
[ 213.169051][ T1827] ? __pfx_hlock_conflict (kernel/locking/lockdep.c:2016) 
[ 213.169195][ T1827] ? check_path.constprop.0 (kernel/locking/lockdep.c:2145) 
[ 213.169342][ T1827] ? check_noncircular (kernel/locking/lockdep.c:2172) 
[ 213.169486][ T1827] ? __pfx_check_noncircular (kernel/locking/lockdep.c:2163) 
[ 213.169654][ T1827] ? rmqueue (mm/page_alloc.c:2922 (discriminator 1)) 
[ 213.169774][ T1827] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 213.170025][ T1827] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 213.170137][ T1827] ? check_prev_add (kernel/locking/lockdep.c:3138) 
[ 213.170280][ T1827] check_prev_add (kernel/locking/lockdep.c:3138) 
[ 213.170423][ T1827] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3759 kernel/locking/lockdep.c:3782 kernel/locking/lockdep.c:3837) 
[ 213.170568][ T1827] validate_chain (kernel/locking/lockdep.c:3254 kernel/locking/lockdep.c:3869) 
[ 213.170862][ T1827] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 213.170987][ T1827] ? __pfx_validate_chain (kernel/locking/lockdep.c:3825) 
[ 213.171148][ T1827] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 213.171326][ T1827] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 213.171450][ T1827] __lock_acquire (kernel/locking/lockdep.c:5137) 
[ 213.171738][ T1827] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 213.171913][ T1827] ? __get_task_comm (fs/exec.c:1234) 
[ 213.172076][ T1827] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 213.172198][ T1827] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 213.172372][ T1827] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 213.172534][ T1827] ? __get_task_comm (fs/exec.c:1234) 
[ 213.172704][ T1827] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 213.172883][ T1827] ? __get_task_comm (fs/exec.c:1234) 
[ 213.173148][ T1827] _raw_spin_lock (./include/linux/spinlock_api_smp.h:134 kernel/locking/spinlock.c:154) 
[ 213.173310][ T1827] ? __get_task_comm (fs/exec.c:1234) 
[ 213.173469][ T1827] __get_task_comm (fs/exec.c:1234) 
[ 213.173652][ T1827] ref_tracker_alloc (lib/ref_tracker.c:217) 
[ 213.173815][ T1827] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 213.174168][ T1827] ? __pfx_ref_tracker_alloc (lib/ref_tracker.c:193) 
[ 213.174337][ T1827] ? rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) 
[ 213.174518][ T1827] ? fib_netdev_event (net/ipv4/fib_frontend.c:1520) 
[ 213.174711][ T1827] ? notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[ 213.174966][ T1827] ? unregister_netdevice_many_notify (net/core/dev.c:11171) 
[ 213.175168][ T1827] ? unregister_netdevice_queue (net/core/dev.c:11108) 
[ 213.175365][ T1827] ? nsim_destroy (drivers/net/netdevsim/netdev.c:502 (discriminator 2)) netdevsim
[ 213.175538][ T1827] ? __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1426) netdevsim
[ 213.175843][ T1827] ? nsim_drv_port_del (drivers/net/netdevsim/dev.c:1729) netdevsim
[ 213.176055][ T1827] ? del_port_store (drivers/net/netdevsim/bus.c:100) netdevsim
[ 213.176268][ T1827] ? kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 213.176521][ T1827] ? vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 213.176690][ T1827] ? ksys_write (fs/read_write.c:643) 
[ 213.176842][ T1827] ? do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 213.176985][ T1827] ? entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[ 213.177260][ T1827] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 213.177408][ T1827] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 213.177563][ T1827] ? rt_flush_dev (net/ipv4/route.c:1551) 
[ 213.177736][ T1827] rt_flush_dev (./include/linux/netdevice.h:4036 ./include/linux/netdevice.h:4114 net/ipv4/route.c:1555) 
[ 213.177988][ T1827] ? __timer_delete_sync (kernel/time/timer.c:1648 (discriminator 1)) 
[ 213.178149][ T1827] ? __timer_delete_sync (kernel/time/timer.c:1668 (discriminator 34)) 
[ 213.178297][ T1827] fib_netdev_event (net/ipv4/fib_frontend.c:1520) 
[ 213.178454][ T1827] notifier_call_chain (kernel/notifier.c:93 (discriminator 2)) 
[ 213.178623][ T1827] unregister_netdevice_many_notify (net/core/dev.c:11171) 
[ 213.178915][ T1827] ? nsim_destroy (drivers/net/netdevsim/netdev.c:497) netdevsim
[ 213.179084][ T1827] ? lock_acquire (kernel/locking/lockdep.c:5727) 
[ 213.179252][ T1827] ? trace_contention_end (./include/trace/events/lock.h:122 (discriminator 52)) 
[ 213.179416][ T1827] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11113) 
[ 213.179735][ T1827] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:618 kernel/locking/mutex.c:752) 
[ 213.179908][ T1827] ? nsim_drv_port_del (drivers/net/netdevsim/dev.c:43 drivers/net/netdevsim/dev.c:1694 drivers/net/netdevsim/dev.c:1724) netdevsim
[ 213.180120][ T1827] ? nsim_destroy (drivers/net/netdevsim/netdev.c:497) netdevsim
[ 213.180296][ T1827] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 213.180456][ T1827] unregister_netdevice_queue (net/core/dev.c:11108) 
[ 213.180625][ T1827] ? nsim_drv_port_del (drivers/net/netdevsim/dev.c:43 drivers/net/netdevsim/dev.c:1694 drivers/net/netdevsim/dev.c:1724) netdevsim
[ 213.180838][ T1827] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11097) 
[ 213.181131][ T1827] ? __pfx___mutex_lock (kernel/locking/mutex.c:751) 
[ 213.181296][ T1827] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 213.181466][ T1827] nsim_destroy (drivers/net/netdevsim/netdev.c:502 (discriminator 2)) netdevsim
[ 213.181648][ T1827] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1426) netdevsim
[ 213.181949][ T1827] nsim_drv_port_del (drivers/net/netdevsim/dev.c:1729) netdevsim
[ 213.182165][ T1827] del_port_store (drivers/net/netdevsim/bus.c:100) netdevsim
[ 213.182349][ T1827] ? __pfx_del_port_store (drivers/net/netdevsim/bus.c:88) netdevsim
[ 213.182571][ T1827] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 213.182847][ T1827] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 213.182999][ T1827] ? sysfs_kf_write (fs/sysfs/file.c:130) 
[ 213.183161][ T1827] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 213.183317][ T1827] vfs_write (./include/linux/fs.h:2108 fs/read_write.c:497 fs/read_write.c:590) 
[ 213.183526][ T1827] ? __pfx_locks_remove_posix (fs/locks.c:2608) 
[ 213.183711][ T1827] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 213.183856][ T1827] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 213.184011][ T1827] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 213.184158][ T1827] ksys_write (fs/read_write.c:643) 
[ 213.184278][ T1827] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 213.184429][ T1827] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 213.184604][ T1827] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[  213.184820][ T1827] RIP: 0033:0x7ff280398957
[ 213.185092][ T1827] Code: 0b 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b7 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 01 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 48 89 54 24 18 48 89 74 24
All code
========
   0:	0b 00                	or     (%rax),%eax
   2:	f7 d8                	neg    %eax
   4:	64 89 02             	mov    %eax,%fs:(%rdx)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b7                	jmp    0xffffffffffffffc7
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 01 00 00 00       	mov    $0x1,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  3c:	48                   	rex.W
  3d:	89                   	.byte 0x89
  3e:	74 24                	je     0x64

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	48 89 54 24 18       	mov    %rdx,0x18(%rsp)
  12:	48                   	rex.W
  13:	89                   	.byte 0x89
  14:	74 24                	je     0x3a
[  213.185658][ T1827] RSP: 002b:00007ffe1118cfa8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  213.186008][ T1827] RAX: ffffffffffffffda RBX: 0000000000000002 RCX: 00007ff280398957
[  213.186257][ T1827] RDX: 0000000000000002 RSI: 000055d8138ee510 RDI: 0000000000000001
[  213.186729][ T1827] RBP: 000055d8138ee510 R08: 0000000000000000 R09: 00007ff28040b4e0
[  213.186984][ T1827] R10: 00007ff28040b3e0 R11: 0000000000000246 R12: 0000000000000002


Finger prints:
dump_stack_lvl:print_bad_irq_dependency:check_irq_usage:check_prev_add