======================================
| [  266.306139][ T2602] ==================================================================
| [ 266.306618][ T2602] BUG: KASAN: slab-use-after-free in devl_rate_leaf_destroy (./arch/x86/include/asm/atomic.h:103 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:327 ./include/linux/refcount.h:348 net/devlink/rate.c:679) 
| [  266.307059][ T2602] Write of size 4 at addr ffff888007ab4710 by task devlink.sh/2602
| [  266.307525][ T2602]
[  266.308070][ T2602] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[  266.308778][ T2602] Call Trace:
[  266.308987][ T2602]  <TASK>
[ 266.309153][ T2602] dump_stack_lvl (lib/dump_stack.c:107) 
[ 266.309396][ T2602] print_address_description.constprop.0 (mm/kasan/report.c:378) 
[ 266.309735][ T2602] ? devl_rate_leaf_destroy (./arch/x86/include/asm/atomic.h:103 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:327 ./include/linux/refcount.h:348 net/devlink/rate.c:679) 
[ 266.310013][ T2602] print_report (mm/kasan/report.c:489) 
[ 266.310241][ T2602] ? kasan_addr_to_slab (./arch/x86/include/asm/bitops.h:206 ./arch/x86/include/asm/bitops.h:238 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/page-flags.h:481 mm/kasan/../slab.h:206 mm/kasan/common.c:38) 
[ 266.310528][ T2602] kasan_report (mm/kasan/report.c:603) 
[ 266.310751][ T2602] ? devl_rate_leaf_destroy (./arch/x86/include/asm/atomic.h:103 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:327 ./include/linux/refcount.h:348 net/devlink/rate.c:679) 
[ 266.311048][ T2602] kasan_check_range (mm/kasan/generic.c:183 mm/kasan/generic.c:189) 
[ 266.311298][ T2602] devl_rate_leaf_destroy (./arch/x86/include/asm/atomic.h:103 ./include/linux/atomic/atomic-arch-fallback.h:949 ./include/linux/atomic/atomic-instrumented.h:401 ./include/linux/refcount.h:327 ./include/linux/refcount.h:348 net/devlink/rate.c:679) 
[ 266.311603][ T2602] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:1424) netdevsim
[ 266.311984][ T2602] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:591 drivers/net/netdevsim/dev.c:1655) netdevsim
[ 266.312339][ T2602] nsim_drv_remove (drivers/net/netdevsim/dev.c:1675) netdevsim
[ 266.312680][ T2602] device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297) 
[ 266.313025][ T2602] ? klist_put (lib/klist.c:220) 
[ 266.313253][ T2602] bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:581) 
[ 266.313542][ T2602] device_del (drivers/base/core.c:3815) 
[ 266.313766][ T2602] ? __pfx_device_del (drivers/base/core.c:3769) 
[ 266.314034][ T2602] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 266.314306][ T2602] ? kernfs_fop_write_iter (fs/kernfs/file.c:326) 
[ 266.314610][ T2602] device_unregister (drivers/base/core.c:3732 drivers/base/core.c:3856) 
[ 266.314895][ T2602] del_device_store (drivers/net/netdevsim/bus.c:230) netdevsim
[ 266.315235][ T2602] ? __pfx_del_device_store (drivers/net/netdevsim/bus.c:197) netdevsim
[ 266.315597][ T2602] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 266.315862][ T2602] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 266.316137][ T2602] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 266.316414][ T2602] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 266.316697][ T2602] vfs_write (./include/linux/fs.h:2085 fs/read_write.c:497 fs/read_write.c:590) 
[ 266.316940][ T2602] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 266.317182][ T2602] ? 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) 
[ 266.317431][ T2602] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 266.317706][ T2602] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 266.317961][ T2602] ksys_write (fs/read_write.c:643) 
[ 266.318178][ T2602] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 266.318469][ T2602] ? do_user_addr_fault (./include/linux/rcupdate.h:784 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[ 266.318739][ T2602] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 266.319003][ T2602] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[  266.319318][ T2602] RIP: 0033:0x7f5ae23c2957
[ 266.319613][ T2602] 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
[  266.320619][ T2602] RSP: 002b:00007ffea7cb5e98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  266.321087][ T2602] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5ae23c2957
[  266.321530][ T2602] RDX: 0000000000000003 RSI: 000055afd5c1f530 RDI: 0000000000000001
[  266.321976][ T2602] RBP: 000055afd5c1f530 R08: 0000000000000000 R09: 00007f5ae24354e0
[  266.322400][ T2602] R10: 00007f5ae24353e0 R11: 0000000000000246 R12: 0000000000000003
[  266.322831][ T2602] R13: 00007f5ae247e760 R14: 0000000000000003 R15: 00007f5ae24799c0
| [  266.341642][ T2602] ------------[ cut here ]------------
| [  266.341960][ T2602] refcount_t: decrement hit 0; leaking memory.
| [ 266.342343][ T2602] WARNING: CPU: 3 PID: 2602 at lib/refcount.c:31 refcount_warn_saturate (lib/refcount.c:31 (discriminator 3)) 
| [  266.342823][ T2602] Modules linked in: netdevsim geneve vxlan ip6_udp_tunnel udp_tunnel [last unloaded: netdevsim]
[  266.343891][ T2602] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[ 266.344573][ T2602] RIP: 0010:refcount_warn_saturate (lib/refcount.c:31 (discriminator 3)) 
[ 266.344953][ T2602] Code: 0f b6 1d 61 c0 5c 03 80 fb 01 0f 87 9b dd 8f 01 83 e3 01 75 38 c6 05 4c c0 5c 03 01 90 48 c7 c7 20 58 02 88 e8 59 4f 2b ff 90 <0f> 0b 90 90 eb 1d 85 ed 74 50 0f b6 1d 30 c0 5c 03 80 fb 01 0f 87
All code
========
   0:	0f b6 1d 61 c0 5c 03 	movzbl 0x35cc061(%rip),%ebx        # 0x35cc068
   7:	80 fb 01             	cmp    $0x1,%bl
   a:	0f 87 9b dd 8f 01    	ja     0x18fddab
  10:	83 e3 01             	and    $0x1,%ebx
  13:	75 38                	jne    0x4d
  15:	c6 05 4c c0 5c 03 01 	movb   $0x1,0x35cc04c(%rip)        # 0x35cc068
  1c:	90                   	nop
  1d:	48 c7 c7 20 58 02 88 	mov    $0xffffffff88025820,%rdi
  24:	e8 59 4f 2b ff       	call   0xffffffffff2b4f82
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	eb 1d                	jmp    0x4d
  30:	85 ed                	test   %ebp,%ebp
  32:	74 50                	je     0x84
  34:	0f b6 1d 30 c0 5c 03 	movzbl 0x35cc030(%rip),%ebx        # 0x35cc06b
  3b:	80 fb 01             	cmp    $0x1,%bl
  3e:	0f                   	.byte 0xf
  3f:	87                   	.byte 0x87

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	eb 1d                	jmp    0x23
   6:	85 ed                	test   %ebp,%ebp
   8:	74 50                	je     0x5a
   a:	0f b6 1d 30 c0 5c 03 	movzbl 0x35cc030(%rip),%ebx        # 0x35cc041
  11:	80 fb 01             	cmp    $0x1,%bl
  14:	0f                   	.byte 0xf
  15:	87                   	.byte 0x87
[  266.345965][ T2602] RSP: 0018:ffffc9000063fa00 EFLAGS: 00010282
[  266.346304][ T2602] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff8550e74f
[  266.346723][ T2602] RDX: 0000000000000000 RSI: 0000000000000008 RDI: 0000000000000001
[  266.347133][ T2602] RBP: 0000000000000004 R08: 0000000000000000 R09: fffff520000c7ee5
[  266.347559][ T2602] R10: ffffc9000063f72f R11: 205d323036325420 R12: ffff888007ab46c8
[  266.347986][ T2602] R13: ffff888007ab4710 R14: ffff888006ce15c0 R15: dffffc0000000000
[  266.348417][ T2602] FS:  00007f5ae2281740(0000) GS:ffff888035e00000(0000) knlGS:0000000000000000
[  266.348894][ T2602] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[  266.349267][ T2602] CR2: 000055afd5c1f530 CR3: 0000000007a54002 CR4: 0000000000770ef0
[  266.349685][ T2602] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[  266.350101][ T2602] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[  266.350542][ T2602] PKRU: 55555554
[  266.350748][ T2602] Call Trace:
[  266.350919][ T2602]  <TASK>
[ 266.351089][ T2602] ? __warn (kernel/panic.c:677) 
[ 266.351315][ T2602] ? console_trylock (kernel/printk/printk.c:2659 kernel/printk/printk.c:2654) 
[ 266.351567][ T2602] ? refcount_warn_saturate (lib/refcount.c:31 (discriminator 3)) 
[ 266.351858][ T2602] ? report_bug (lib/bug.c:201 lib/bug.c:219) 
[ 266.352108][ T2602] ? handle_bug (arch/x86/kernel/traps.c:238) 
[ 266.352347][ T2602] ? exc_invalid_op (arch/x86/kernel/traps.c:259 (discriminator 1)) 
[ 266.352595][ T2602] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 266.352873][ T2602] ? desc_read (./arch/x86/include/asm/atomic64_64.h:20 ./include/linux/atomic/atomic-arch-fallback.h:2615 ./include/linux/atomic/atomic-long.h:79 ./include/linux/atomic/atomic-instrumented.h:3196 kernel/printk/printk_ringbuffer.c:534) 
[ 266.353102][ T2602] ? refcount_warn_saturate (lib/refcount.c:31 (discriminator 3)) 
[ 266.353387][ T2602] devl_rate_leaf_destroy (./include/linux/refcount.h:333 ./include/linux/refcount.h:348 net/devlink/rate.c:679) 
[ 266.353670][ T2602] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:1424) netdevsim
[ 266.354005][ T2602] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:591 drivers/net/netdevsim/dev.c:1655) netdevsim
[ 266.354356][ T2602] nsim_drv_remove (drivers/net/netdevsim/dev.c:1675) netdevsim
[ 266.354658][ T2602] device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297) 
[ 266.354981][ T2602] ? klist_put (lib/klist.c:220) 
[ 266.355208][ T2602] bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:581) 
[ 266.355462][ T2602] device_del (drivers/base/core.c:3815) 
[ 266.355691][ T2602] ? __pfx_device_del (drivers/base/core.c:3769) 
[ 266.355939][ T2602] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 266.356212][ T2602] ? kernfs_fop_write_iter (fs/kernfs/file.c:326) 
[ 266.356492][ T2602] device_unregister (drivers/base/core.c:3732 drivers/base/core.c:3856) 
[ 266.356738][ T2602] del_device_store (drivers/net/netdevsim/bus.c:230) netdevsim
[ 266.357049][ T2602] ? __pfx_del_device_store (drivers/net/netdevsim/bus.c:197) netdevsim
[ 266.357389][ T2602] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 266.357671][ T2602] ? sysfs_file_ops (fs/sysfs/file.c:31 (discriminator 1)) 
[ 266.357920][ T2602] ? __pfx_sysfs_kf_write (fs/sysfs/file.c:129) 
[ 266.358189][ T2602] kernfs_fop_write_iter (fs/kernfs/file.c:334) 
[ 266.358460][ T2602] vfs_write (./include/linux/fs.h:2085 fs/read_write.c:497 fs/read_write.c:590) 
[ 266.358691][ T2602] ? __pfx_vfs_write (fs/read_write.c:571) 
[ 266.358933][ T2602] ? 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) 
[ 266.359175][ T2602] ? __pfx___lock_release (kernel/locking/lockdep.c:5406) 
[ 266.359443][ T2602] ? __fget_light (./include/linux/atomic/atomic-arch-fallback.h:479 ./include/linux/atomic/atomic-instrumented.h:50 fs/file.c:1145) 
[ 266.359680][ T2602] ksys_write (fs/read_write.c:643) 
[ 266.359896][ T2602] ? __pfx_ksys_write (fs/read_write.c:633) 
[ 266.360144][ T2602] ? do_user_addr_fault (./include/linux/rcupdate.h:784 ./include/linux/mm.h:688 arch/x86/mm/fault.c:1366) 
[ 266.360418][ T2602] do_syscall_64 (arch/x86/entry/common.c:52 arch/x86/entry/common.c:83) 
[ 266.360652][ T2602] entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:129) 
[  266.360967][ T2602] RIP: 0033:0x7f5ae23c2957
[ 266.361198][ T2602] 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
[  266.362181][ T2602] RSP: 002b:00007ffea7cb5e98 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[  266.362603][ T2602] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f5ae23c2957
[  266.363007][ T2602] RDX: 0000000000000003 RSI: 000055afd5c1f530 RDI: 0000000000000001
[  266.363411][ T2602] RBP: 000055afd5c1f530 R08: 0000000000000000 R09: 00007f5ae24354e0
[  266.363819][ T2602] R10: 00007f5ae24353e0 R11: 0000000000000246 R12: 0000000000000003


Finger prints:
dump_stack_lvl:print_report:kasan_report:kasan_check_range
refcount_warn_saturate:devl_rate_leaf_destroy:__nsim_dev_port_del:nsim_dev_reload_destroy