RBP: 00007f6640253ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f66403f9080 R15: 00007ffce9c68c58
---[ end trace 593f38ae4f7c62df ]---
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 13865 Comm: syz.2.3147 Tainted: G        W         5.4.292-syzkaller-00021-gcd8e74fa0fa3 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:kill_device drivers/base/core.c:3025 [inline]
RIP: 0010:device_del+0xe7/0xfb0 drivers/base/core.c:3052
Code: 00 74 08 48 89 df e8 08 38 0d ff 41 bf c8 00 00 00 48 89 5c 24 18 4c 03 3b 4c 89 fb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 0f 85 3c 0e 00 00 45 0f b6 27 44 89 e6 83 e6 01
RSP: 0018:ffff8881e5ab7a40 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000019 RCX: 1ffff1103d2a141b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881e5ab79c0
RBP: ffff8881e5ab7b20 R08: dffffc0000000000 R09: ffffed103cb56f39
R10: ffffed103cb56f39 R11: 1ffff1103cb56f38 R12: dffffc0000000000
R13: ffff8881e950a070 R14: ffff8881e950a110 R15: 00000000000000c8
FS:  00007f663e8196c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f72736cdd04 CR3: 00000001a6bd0000 CR4: 00000000003406b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0x89c/0xa90 block/genhd.c:835
 loop_remove+0x46/0xb0 drivers/block/loop.c:2194
 loop_control_ioctl+0x487/0x550 drivers/block/loop.c:2293
 do_vfs_ioctl+0x753/0x13f0 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+0xe1/0x120 fs/ioctl.c:747
 do_syscall_64+0xcf/0x170 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x5c/0xc1
RIP: 0033:0x7f66401d1969
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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f663e819038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f66403f9080 RCX: 00007f66401d1969
RDX: 0000000000100002 RSI: 0000000000004c81 RDI: 0000000000000008
RBP: 00007f6640253ab1 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f66403f9080 R15: 00007ffce9c68c58
Modules linked in:
---[ end trace 593f38ae4f7c62e0 ]---
RIP: 0010:kill_device drivers/base/core.c:3025 [inline]
RIP: 0010:device_del+0xe7/0xfb0 drivers/base/core.c:3052
Code: 00 74 08 48 89 df e8 08 38 0d ff 41 bf c8 00 00 00 48 89 5c 24 18 4c 03 3b 4c 89 fb 48 c1 eb 03 48 b8 00 00 00 00 00 fc ff df <0f> b6 04 03 84 c0 0f 85 3c 0e 00 00 45 0f b6 27 44 89 e6 83 e6 01
RSP: 0018:ffff8881e5ab7a40 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000019 RCX: 1ffff1103d2a141b
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffff8881e5ab79c0
RBP: ffff8881e5ab7b20 R08: dffffc0000000000 R09: ffffed103cb56f39
R10: ffffed103cb56f39 R11: 1ffff1103cb56f38 R12: dffffc0000000000
R13: ffff8881e950a070 R14: ffff8881e950a110 R15: 00000000000000c8
FS:  00007f663e8196c0(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000057f000 CR3: 00000001a6bd0000 CR4: 00000000003406a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 74 08 48          	add    %dh,0x48(%rax,%rcx,1)
   4:	89 df                	mov    %ebx,%edi
   6:	e8 08 38 0d ff       	call   0xff0d3813
   b:	41 bf c8 00 00 00    	mov    $0xc8,%r15d
  11:	48 89 5c 24 18       	mov    %rbx,0x18(%rsp)
  16:	4c 03 3b             	add    (%rbx),%r15
  19:	4c 89 fb             	mov    %r15,%rbx
  1c:	48 c1 eb 03          	shr    $0x3,%rbx
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	0f b6 04 03          	movzbl (%rbx,%rax,1),%eax <-- trapping instruction
  2e:	84 c0                	test   %al,%al
  30:	0f 85 3c 0e 00 00    	jne    0xe72
  36:	45 0f b6 27          	movzbl (%r15),%r12d
  3a:	44 89 e6             	mov    %r12d,%esi
  3d:	83 e6 01             	and    $0x1,%esi