======================================
| [ 408.244526][ T6269] #6: ffffffff9a1e3948 (rtnl_mutex){+.+.}-{4:4}, at: nsim_destroy (drivers/net/netdevsim/netdev.c:826) netdevsim
| [ 408.244905][ T6269] #7: ffffffff9a1d25f0 ((netdev_chain).rwsem){++++}-{4:4}, at: blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
| [  408.245274][ T6269]
| [  408.245274][ T6269] stack backtrace:
[  408.245813][ T6269] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  408.246040][ T6269] Call Trace:
[  408.246190][ T6269]  <TASK>
[ 408.246285][ T6269] dump_stack_lvl (lib/dump_stack.c:123)
[ 408.246471][ T6269] print_deadlock_bug (kernel/locking/lockdep.c:3040)
[ 408.246660][ T6269] validate_chain (kernel/locking/lockdep.c:3894)
[ 408.246847][ T6269] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 408.247050][ T6269] ? __pfx_validate_chain (kernel/locking/lockdep.c:3860)
[ 408.247228][ T6269] ? 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)
[ 408.247396][ T6269] ? mark_lock (kernel/locking/lockdep.c:4727 (discriminator 3))
[ 408.247537][ T6269] __lock_acquire (kernel/locking/lockdep.c:5226)
[ 408.247726][ T6269] ? usage_match (kernel/locking/lockdep.c:2277)
[ 408.247910][ T6269] lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 408.248100][ T6269] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 408.248331][ T6269] ? __pfx_check_irq_usage (kernel/locking/lockdep.c:2813)
[ 408.248519][ T6269] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5814)
[ 408.248699][ T6269] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 37))
[ 408.248870][ T6269] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 408.249049][ T6269] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 408.249300][ T6269] down_read (./arch/x86/include/asm/preempt.h:79 kernel/locking/rwsem.c:1246 kernel/locking/rwsem.c:1261 kernel/locking/rwsem.c:1526)
[ 408.249431][ T6269] ? blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 408.249640][ T6269] ? __pfx_down_read (kernel/locking/rwsem.c:1522)
[ 408.249827][ T6269] ? notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 408.249996][ T6269] blocking_notifier_call_chain (kernel/notifier.c:380 kernel/notifier.c:368)
[ 408.250163][ T6269] __netdev_upper_dev_unlink (net/core/dev.c:8000 (discriminator 11) net/core/dev.c:8017 (discriminator 11) net/core/dev.c:8167 (discriminator 11))
[ 408.250333][ T6269] ? __pfx___netdev_upper_dev_unlink (net/core/dev.c:8151)
[ 408.250540][ T6269] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 408.250726][ T6269] ? mutex_is_locked (./arch/x86/include/asm/atomic64_64.h:15 ./include/linux/atomic/atomic-arch-fallback.h:2583 ./include/linux/atomic/atomic-long.h:38 ./include/linux/atomic/atomic-instrumented.h:3189 kernel/locking/mutex.h:47 kernel/locking/mutex.c:66)
[ 408.250905][ T6269] ? rtnl_is_locked (net/core/rtnetlink.c:164)
[ 408.251076][ T6269] netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 408.251242][ T6269] ? __pfx_netdev_upper_dev_unlink (net/core/dev.c:8190)
[ 408.251452][ T6269] ? macsec_del_dev (drivers/net/macsec.c:4005 (discriminator 1)) macsec
[ 408.251626][ T6269] macsec_common_dellink (drivers/net/macsec.c:4036) macsec
[ 408.251848][ T6269] ? __pfx_macsec_common_dellink (drivers/net/macsec.c:4015) macsec
[ 408.252065][ T6269] ? __mutex_unlock_slowpath (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4329 ./include/linux/atomic/atomic-long.h:1506 ./include/linux/atomic/atomic-instrumented.h:4481 kernel/locking/mutex.c:913)
[ 408.252240][ T6269] macsec_notify (drivers/net/macsec.c:4479 (discriminator 3)) macsec
[ 408.252420][ T6269] ? __pfx_macsec_notify (drivers/net/macsec.c:4457) macsec
[ 408.252645][ T6269] ? packet_notifier (net/packet/af_packet.c:4282)
[ 408.252819][ T6269] notifier_call_chain (kernel/notifier.c:85 (discriminator 2))
[ 408.252986][ T6269] blocking_notifier_call_chain (kernel/notifier.c:381 kernel/notifier.c:368)
[ 408.253188][ T6269] unregister_netdevice_many_notify (net/core/dev.c:11571)
[ 408.253406][ T6269] ? __mutex_trylock_common (./arch/x86/include/asm/atomic64_64.h:101 ./include/linux/atomic/atomic-arch-fallback.h:4296 ./include/linux/atomic/atomic-long.h:1482 ./include/linux/atomic/atomic-instrumented.h:4458 kernel/locking/mutex.c:104)
[ 408.253577][ T6269] ? __pfx___mutex_trylock_common (kernel/locking/mutex.c:79)
[ 408.253822][ T6269] ? __pfx_unregister_netdevice_many_notify (net/core/dev.c:11512)
[ 408.254041][ T6269] ? lock_acquire (kernel/locking/lockdep.c:5822)
[ 408.254232][ T6269] ? __mutex_lock (./arch/x86/include/asm/preempt.h:94 kernel/locking/mutex.c:595 kernel/locking/mutex.c:735)
[ 408.254412][ T6269] ? nsim_destroy (drivers/net/netdevsim/netdev.c:826) netdevsim
[ 408.254596][ T6269] ? __pfx___mutex_lock (kernel/locking/mutex.c:734)
[ 408.254777][ T6269] unregister_netdevice_queue (net/core/dev.c:11507)
[ 408.254974][ T6269] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114)
[ 408.255158][ T6269] ? __pfx_unregister_netdevice_queue (net/core/dev.c:11496)
[ 408.255388][ T6269] nsim_destroy (drivers/net/netdevsim/netdev.c:831 (discriminator 2)) netdevsim
[ 408.255582][ T6269] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:426 drivers/net/netdevsim/dev.c:1429) netdevsim
[ 408.255822][ T6269] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1438 drivers/net/netdevsim/dev.c:1661) netdevsim
[ 408.256065][ T6269] nsim_drv_remove (drivers/net/netdevsim/dev.c:1678) netdevsim
[ 408.256274][ T6269] device_release_driver_internal (drivers/base/dd.c:1275 drivers/base/dd.c:1296)
[ 408.256508][ T6269] ? klist_put (lib/klist.c:220)
[ 408.256659][ T6269] bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:583)
[ 408.256848][ T6269] device_del (drivers/base/core.c:3855)
[ 408.256987][ T6269] ? __pfx_device_del (drivers/base/core.c:3809)
[ 408.257185][ T6269] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5851)
[ 408.257369][ T6269] ? kernfs_fop_write_iter (fs/kernfs/file.c:326)
[ 408.257569][ T6269] device_unregister (drivers/base/core.c:3772 drivers/base/core.c:3896)
[ 408.257751][ T6269] del_device_store (drivers/net/netdevsim/bus.c:230) netdevsim
[ 408.258003][ T6269] ? __pfx_del_device_store (drivers/net/netdevsim/bus.c:197) netdevsim
[ 408.258242][ T6269] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132)
[ 408.258436][ T6269] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1))
[ 408.258620][ T6269] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:132)
[ 408.258818][ T6269] kernfs_fop_write_iter (fs/kernfs/file.c:334)
[ 408.259001][ T6269] vfs_write (fs/read_write.c:586 fs/read_write.c:679)
[ 408.259144][ T6269] ? __pfx_vfs_write (fs/read_write.c:660)
[ 408.259346][ T6269] ? find_held_lock (kernel/locking/lockdep.c:5339)
[ 408.259548][ T6269] ? __pfx___lock_release (kernel/locking/lockdep.c:5501)
[ 408.259732][ T6269] ksys_write (fs/read_write.c:731)
[ 408.259871][ T6269] ? __pfx_ksys_write (fs/read_write.c:721)
[ 408.260069][ T6269] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83)
[ 408.260267][ T6269] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[  408.260499][ T6269] RIP: 0033:0x7f3b1227fb77
[ 408.260691][ T6269] 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
[  408.261345][ T6269] RSP: 002b:00007ffe23924d38 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  408.261638][ T6269] RAX: ffffffffffffffda RBX: 0000000000000004 RCX: 00007f3b1227fb77
[  408.261914][ T6269] RDX: 0000000000000004 RSI: 00005582b78ebb80 RDI: 0000000000000001
[  408.262189][ T6269] RBP: 00005582b78ebb80 R08: 0000000000000000 R09: 00007f3b122f24e0
[  408.262466][ T6269] R10: 00007f3b122f23e0 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
print_deadlock_bug:validate_chain:__lock_acquire:down_read:blocking_notifier_call_chain