RAX: ffffffffffffffda RBX: 00007f4fd55d3f60 RCX: 00007f4fd54c1109
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000007
RBP: 00007f4fd551b05d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe61b245ff R14: 00007f4fd4637300 R15: 0000000000022000
---[ end trace 951f7f8d50c96ccf ]---
stack segment: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 10819 Comm: syz-executor.4 Tainted: G        W         5.4.190-syzkaller-00044-g77dc925ddffb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0x9f/0xf40 drivers/base/core.c:3049
Code: 74 08 4c 89 e7 e8 c1 5c 10 ff 48 89 5c 24 10 41 bf c8 00 00 00 4d 03 3c 24 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <8a> 44 05 00 84 c0 0f 85 17 0e 00 00 41 0f b6 1f 89 de 83 e6 01 31
RSP: 0018:ffff8881db45fcb8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1103d58f01b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881db45fc78
RBP: 0000000000000019 R08: dffffc0000000000 R09: ffffed103b68bf90
R10: ffffed103b68bf90 R11: 1ffff1103b68bf8f R12: ffff8881eac780d8
R13: ffff8881eac78070 R14: ffff8881eac78110 R15: 00000000000000c8
FS:  00007f4fd4637700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95d05aff64 CR3: 00000001e0fe4000 CR4: 00000000003426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0x93f/0xb60 block/genhd.c:835
 loop_remove+0x42/0xa0 drivers/block/loop.c:2189
 loop_control_ioctl+0x547/0x600 drivers/block/loop.c:2288
 do_vfs_ioctl+0x6d1/0x15b0 fs/ioctl.c:47
 ksys_ioctl fs/ioctl.c:742 [inline]
 __do_sys_ioctl fs/ioctl.c:749 [inline]
 __se_sys_ioctl fs/ioctl.c:747 [inline]
 __x64_sys_ioctl+0xd4/0x110 fs/ioctl.c:747
 do_syscall_64+0xcb/0x1c0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f4fd54c1109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f4fd4637168 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f4fd55d3f60 RCX: 00007f4fd54c1109
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000007
RBP: 00007f4fd551b05d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe61b245ff R14: 00007f4fd4637300 R15: 0000000000022000
Modules linked in:
---[ end trace 951f7f8d50c96cd0 ]---
RIP: 0010:kill_device drivers/base/core.c:3022 [inline]
RIP: 0010:device_del+0x9f/0xf40 drivers/base/core.c:3049
Code: 74 08 4c 89 e7 e8 c1 5c 10 ff 48 89 5c 24 10 41 bf c8 00 00 00 4d 03 3c 24 4c 89 fd 48 c1 ed 03 48 b8 00 00 00 00 00 fc ff df <8a> 44 05 00 84 c0 0f 85 17 0e 00 00 41 0f b6 1f 89 de 83 e6 01 31
RSP: 0018:ffff8881db45fcb8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 1ffff1103d58f01b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881db45fc78
RBP: 0000000000000019 R08: dffffc0000000000 R09: ffffed103b68bf90
R10: ffffed103b68bf90 R11: 1ffff1103b68bf8f R12: ffff8881eac780d8
R13: ffff8881eac78070 R14: ffff8881eac78110 R15: 00000000000000c8
FS:  00007f4fd4637700(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f95d05aff64 CR3: 00000001e0fe4000 CR4: 00000000003406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	74 08                	je     0xa
   2:	4c 89 e7             	mov    %r12,%rdi
   5:	e8 c1 5c 10 ff       	callq  0xff105ccb
   a:	48 89 5c 24 10       	mov    %rbx,0x10(%rsp)
   f:	41 bf c8 00 00 00    	mov    $0xc8,%r15d
  15:	4d 03 3c 24          	add    (%r12),%r15
  19:	4c 89 fd             	mov    %r15,%rbp
  1c:	48 c1 ed 03          	shr    $0x3,%rbp
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	8a 44 05 00          	mov    0x0(%rbp,%rax,1),%al <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 17 0e 00 00    	jne    0xe4d
  36:	41 0f b6 1f          	movzbl (%r15),%ebx
  3a:	89 de                	mov    %ebx,%esi
  3c:	83 e6 01             	and    $0x1,%esi
  3f:	31                   	.byte 0x31