======================================
| [   31.981373][  T335] ==================================================================
| [   31.981783][  T335] BUG: KASAN: null-ptr-deref in try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
| [   31.982098][  T335] Write of size 8 at addr 0000000000000000 by task peer.sh/335
| [   31.982414][  T335]
[   31.982527][  T335] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   31.982530][  T335] Call Trace:
[   31.982532][  T335]  <TASK>
[   31.982534][  T335]  dump_stack_lvl (lib/dump_stack.c:123)
[   31.982543][  T335]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   31.982547][  T335]  kasan_report (mm/kasan/report.c:597)
[   31.982554][  T335]  ? try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   31.982560][  T335]  kasan_check_range (mm/kasan/generic.c:194 mm/kasan/generic.c:200)
[   31.982564][  T335]  try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   31.982568][  T335]  ? page_pool_release (net/core/page_pool.c:1196)
[   31.982575][  T335]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   31.982579][  T335]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   31.982585][  T335]  ? page_pool_release (net/core/page_pool.c:1196)
[   31.982590][  T335]  ? page_pool_destroy (net/core/page_pool.c:1296)
[   31.982598][  T335]  __cancel_work_sync (kernel/workqueue.c:4383)
[   31.982604][  T335]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   31.982614][  T335]  ? netdev_notify_peers (net/core/dev.c:1891)
[   31.982621][  T335]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:739 kernel/locking/mutex.c:760)
[   31.982629][  T335]  netif_close_many (net/core/dev.c:1959)
[   31.982633][  T335]  ? ww_mutex_lock (kernel/locking/mutex.c:759)
[   31.982637][  T335]  ? __dev_close_many (net/core/dev.c:1949)
[   31.982640][  T335]  ? validate_chain (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876)
[   31.982647][  T335]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   31.982652][  T335]  netif_close_many_and_unlock (net/core/dev.c:12476)
[   31.982658][  T335]  unregister_netdevice_many_notify (net/core/dev.c:12539)
[   31.982662][  T335]  ? __mutex_handoff (kernel/locking/mutex.c:88)
[   31.982667][  T335]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   31.982673][  T335]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   31.982676][  T335]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:739 kernel/locking/mutex.c:760)
[   31.982679][  T335]  ? __rtnl_unlock (net/core/rtnetlink.c:145 (discriminator 3))
[   31.982685][  T335]  ? nsim_destroy (drivers/net/netdevsim/netdev.c:1174) netdevsim
[   31.982701][  T335]  ? ww_mutex_lock (kernel/locking/mutex.c:759)
[   31.982706][  T335]  unregister_netdevice_queue (net/core/dev.c:12452)
[   31.982710][  T335]  ? unregister_netdevice_many (net/core/dev.c:12441)
[   31.982716][  T335] nsim_destroy (drivers/net/netdevsim/netdev.c:1179 (discriminator 2)) netdevsim
[   31.982730][  T335] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:443 drivers/net/netdevsim/dev.c:1528) netdevsim
[   31.982742][  T335] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1537 drivers/net/netdevsim/dev.c:1762) netdevsim
[   31.982754][  T335] nsim_drv_remove (drivers/net/netdevsim/dev.c:1779) netdevsim
[   31.982765][  T335]  device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297)
[   31.982773][  T335]  ? klist_put (lib/klist.c:220)
[   31.982778][  T335]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:586)
[   31.982783][  T335]  device_del (drivers/base/core.c:3879)
[   31.982787][  T335]  ? __device_link_del (drivers/base/core.c:3833)
[   31.982792][  T335]  device_unregister (drivers/base/core.c:3796 drivers/base/core.c:3920)
[   31.982795][  T335] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[   31.982807][  T335]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[   31.982818][  T335]  ? sysfs_file_kobj (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/linux/rcupdate.h:1195 fs/sysfs/file.c:24)
[   31.982823][  T335]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[   31.982827][  T335]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[   31.982829][  T335]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[   31.982834][  T335]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[   31.982840][  T335]  ? kernel_write (fs/read_write.c:667)
[   31.982845][  T335]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   31.982852][  T335]  ksys_write (fs/read_write.c:738)
[   31.982856][  T335]  ? __ia32_sys_read (fs/read_write.c:728)
[   31.982862][  T335]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   31.982867][  T335]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   31.982871][  T335] RIP: 0033:0x7fc97b04a257
[   31.982875][  T335] Code: 0f 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:	0f 00                	(bad)
   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
[   31.982878][  T335] RSP: 002b:00007ffe92357388 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   31.982882][  T335] RAX: ffffffffffffffda RBX: 00007fc97b146780 RCX: 00007fc97b04a257
[   31.982885][  T335] RDX: 0000000000000004 RSI: 000056282cbc1660 RDI: 0000000000000001
[   31.982886][  T335] RBP: 0000000000000004 R08: 0000000000000000 R09: 00007fc97b0fcd20
[   31.982888][  T335] R10: 00007fc97b0fcc20 R11: 0000000000000246 R12: 0000000000000004
[   31.982889][  T335] R13: 000056282cbc1660 R14: 0000000000000004 R15: 00007fc97b1419c0
| [   32.000731][  T335] #PF: error_code(0x0002) - not-present page
| [   32.000973][  T335] PGD 0 P4D 0
| [   32.001143][  T335] Oops: Oops: 0002 [#1] SMP KASAN
| [   32.001879][  T335] Tainted: [B]=BAD_PAGE
[   32.002031][  T335] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   32.002288][  T335] RIP: 0010:try_to_grab_pending (./arch/x86/include/asm/bitops.h:136 ./include/asm-generic/bitops/instrumented-atomic.h:72 kernel/workqueue.c:2072)
[   32.002697][  T335] Code: 00 41 89 c0 b8 01 00 00 00 45 85 c0 74 0f 48 83 c4 10 5b 5d 41 5c 41 5d 41 5e 41 5f c3 be 08 00 00 00 48 89 df e8 af 80 81 00 <f0> 48 0f ba 2b 00 72 11 48 83 c4 10 31 c0 5b 5d 41 5c 41 5d 41 5e
All code
========
   0:	00 41 89             	add    %al,-0x77(%rcx)
   3:	c0 b8 01 00 00 00 45 	sarb   $0x45,0x1(%rax)
   a:	85 c0                	test   %eax,%eax
   c:	74 0f                	je     0x1d
   e:	48 83 c4 10          	add    $0x10,%rsp
  12:	5b                   	pop    %rbx
  13:	5d                   	pop    %rbp
  14:	41 5c                	pop    %r12
  16:	41 5d                	pop    %r13
  18:	41 5e                	pop    %r14
  1a:	41 5f                	pop    %r15
  1c:	c3                   	ret
  1d:	be 08 00 00 00       	mov    $0x8,%esi
  22:	48 89 df             	mov    %rbx,%rdi
  25:	e8 af 80 81 00       	call   0x8180d9
  2a:*	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)		<-- trapping instruction
  30:	72 11                	jb     0x43
  32:	48 83 c4 10          	add    $0x10,%rsp
  36:	31 c0                	xor    %eax,%eax
  38:	5b                   	pop    %rbx
  39:	5d                   	pop    %rbp
  3a:	41 5c                	pop    %r12
  3c:	41 5d                	pop    %r13
  3e:	41 5e                	pop    %r14

Code starting with the faulting instruction
===========================================
   0:	f0 48 0f ba 2b 00    	lock btsq $0x0,(%rbx)
   6:	72 11                	jb     0x19
   8:	48 83 c4 10          	add    $0x10,%rsp
   c:	31 c0                	xor    %eax,%eax
   e:	5b                   	pop    %rbx
   f:	5d                   	pop    %rbp
  10:	41 5c                	pop    %r12
  12:	41 5d                	pop    %r13
  14:	41 5e                	pop    %r14
[   32.003536][  T335] RSP: 0018:ffffc90000797510 EFLAGS: 00010046
[   32.003790][  T335] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffac23e90a
[   32.004081][  T335] RDX: fffffbfff608decd RSI: 0000000000000008 RDI: ffffffffb046f660
[   32.004549][  T335] RBP: ffffc90000797578 R08: 0000000000000001 R09: fffffbfff608decc
[   32.004840][  T335] R10: ffffffffb046f667 R11: ffffc90000797000 R12: 0000000000000000
[   32.005131][  T335] R13: 0000000000000282 R14: ffff88800c0d2000 R15: dffffc0000000000
[   32.005585][  T335] FS:  00007fc97af4a000(0000) GS:ffff888085f7c000(0000) knlGS:0000000000000000
[   32.005928][  T335] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   32.006338][  T335] CR2: 0000000000000000 CR3: 0000000008c6c003 CR4: 0000000000772ef0
[   32.006650][  T335] PKRU: 55555554
[   32.006797][  T335] Call Trace:
[   32.006940][  T335]  <TASK>
[   32.007038][  T335]  ? page_pool_release (net/core/page_pool.c:1196)
[   32.007398][  T335]  __cancel_work (kernel/workqueue.c:2161 kernel/workqueue.c:4364)
[   32.007596][  T335]  ? enable_delayed_work (kernel/workqueue.c:4359)
[   32.007787][  T335]  ? page_pool_release (net/core/page_pool.c:1196)
[   32.007975][  T335]  ? page_pool_destroy (net/core/page_pool.c:1296)
[   32.008308][  T335]  __cancel_work_sync (kernel/workqueue.c:4383)
[   32.008512][  T335]  __dev_close_many (net/core/dev.c:1879 (discriminator 2) net/core/dev.c:1932 (discriminator 2))
[   32.008705][  T335]  ? netdev_notify_peers (net/core/dev.c:1891)
[   32.008894][  T335]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:739 kernel/locking/mutex.c:760)
[   32.009217][  T335]  netif_close_many (net/core/dev.c:1959)
[   32.009442][  T335]  ? ww_mutex_lock (kernel/locking/mutex.c:759)
[   32.009635][  T335]  ? __dev_close_many (net/core/dev.c:1949)
[   32.009827][  T335]  ? validate_chain (kernel/locking/lockdep.c:3801 kernel/locking/lockdep.c:3821 kernel/locking/lockdep.c:3876)
[   32.010148][  T335]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   32.010361][  T335]  netif_close_many_and_unlock (net/core/dev.c:12476)
[   32.010563][  T335]  unregister_netdevice_many_notify (net/core/dev.c:12539)
[   32.010804][  T335]  ? __mutex_handoff (kernel/locking/mutex.c:88)
[   32.011000][  T335]  ? rcu_is_watching (./include/linux/context_tracking.h:128 kernel/rcu/tree.c:751)
[   32.011193][  T335]  ? dev_ingress_queue_create (net/core/dev.c:12499)
[   32.011409][  T335]  ? __mutex_lock (./arch/x86/include/asm/preempt.h:104 kernel/locking/mutex.c:739 kernel/locking/mutex.c:760)
[   32.011614][  T335]  ? __rtnl_unlock (net/core/rtnetlink.c:145 (discriminator 3))
[   32.011930][  T335]  ? nsim_destroy (drivers/net/netdevsim/netdev.c:1174) netdevsim
[   32.012137][  T335]  ? ww_mutex_lock (kernel/locking/mutex.c:759)
[   32.012336][  T335]  unregister_netdevice_queue (net/core/dev.c:12452)
[   32.012588][  T335]  ? unregister_netdevice_many (net/core/dev.c:12441)
[   32.012909][  T335] nsim_destroy (drivers/net/netdevsim/netdev.c:1179 (discriminator 2)) netdevsim
[   32.013110][  T335] __nsim_dev_port_del (drivers/net/netdevsim/dev.c:443 drivers/net/netdevsim/dev.c:1528) netdevsim
[   32.013356][  T335] nsim_dev_reload_destroy (drivers/net/netdevsim/dev.c:1537 drivers/net/netdevsim/dev.c:1762) netdevsim
[   32.013751][  T335] nsim_drv_remove (drivers/net/netdevsim/dev.c:1779) netdevsim
[   32.013949][  T335]  device_release_driver_internal (drivers/base/dd.c:1276 drivers/base/dd.c:1297)
[   32.014196][  T335]  ? klist_put (lib/klist.c:220)
[   32.014345][  T335]  bus_remove_device (./include/linux/kobject.h:193 drivers/base/base.h:73 drivers/base/bus.c:586)
[   32.014677][  T335]  device_del (drivers/base/core.c:3879)
[   32.014837][  T335]  ? __device_link_del (drivers/base/core.c:3833)
[   32.015030][  T335]  device_unregister (drivers/base/core.c:3796 drivers/base/core.c:3920)
[   32.015223][  T335] del_device_store (drivers/net/netdevsim/bus.c:248) netdevsim
[   32.015606][  T335]  ? nsim_bus_dev_numvfs_show (drivers/net/netdevsim/bus.c:215) netdevsim
[   32.015856][  T335]  ? sysfs_file_kobj (./include/linux/rcupdate.h:341 ./include/linux/rcupdate.h:897 ./include/linux/rcupdate.h:1195 fs/sysfs/file.c:24)
[   32.016051][  T335]  ? sysfs_file_kobj (fs/sysfs/file.c:26)
[   32.016240][  T335]  ? sysfs_file_ops (fs/sysfs/file.c:135)
[   32.016570][  T335]  kernfs_fop_write_iter (fs/kernfs/file.c:88 fs/kernfs/file.c:356)
[   32.016764][  T335]  vfs_write (fs/read_write.c:594 fs/read_write.c:686)
[   32.016914][  T335]  ? kernel_write (fs/read_write.c:667)
[   32.017105][  T335]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   32.017434][  T335]  ksys_write (fs/read_write.c:738)
[   32.017600][  T335]  ? __ia32_sys_read (fs/read_write.c:728)
[   32.017800][  T335]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   32.017994][  T335]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   32.018350][  T335] RIP: 0033:0x7fc97b04a257
[   32.018582][  T335] Code: 0f 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:	0f 00                	(bad)
   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
[   32.019402][  T335] RSP: 002b:00007ffe92357388 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
[   32.019706][  T335] RAX: ffffffffffffffda RBX: 00007fc97b146780 RCX: 00007fc97b04a257
[   32.019994][  T335] RDX: 0000000000000004 RSI: 000056282cbc1660 RDI: 0000000000000001
[   32.020405][  T335] RBP: 0000000000000004 R08: 0000000000000000 R09: 00007fc97b0fcd20
[   32.020712][  T335] R10: 00007fc97b0fcc20 R11: 0000000000000246 R12: 0000000000000004


Finger prints:
try_to_grab_pending:__cancel_work:__cancel_work_sync:__dev_close_many:netif_close_many
kasan_report:kasan_check_range:try_to_grab_pending:__cancel_work:__cancel_work_sync