RAX: ffffffffffffffda RBX: 00007ff4dee39f80 RCX: 00007ff4ded0bea9
RDX: 000000000040000c RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007ff4ded584a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff4dee39f80 R15: 00007ffc2a526e78
---[ end trace 7c9958bc004ae7d2 ]---
general protection fault, probably for non-canonical address 0xdffffc000000001a: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x00000000000000d0-0x00000000000000d7]
CPU: 1 PID: 9050 Comm: syz-executor.1 Tainted: G        W         5.10.209-syzkaller-00002-g4e1bc8d8e8ae #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024
RIP: 0010:kill_device drivers/base/core.c:3369 [inline]
RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3397
Code: 20 42 80 3c 28 00 74 08 48 89 df e8 9b bc dd fe 4c 89 7c 24 40 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 0a 0d 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffffc90000f67b80 EFLAGS: 00010202
RAX: 1ffff11021979e1a RBX: ffff88810cbcf0d0 RCX: ffffffff84b02565
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000f67b00
RBP: ffffc90000f67c70 R08: dffffc0000000000 R09: fffff520001ecf61
R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000001a
R13: dffffc0000000000 R14: ffff88810cbcf108 R15: 00000000000000d0
FS:  00007ff4dda7f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001b40 CR3: 000000011224f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0x88d/0xa90 block/genhd.c:953
 loop_remove+0x46/0xb0 drivers/block/loop.c:2210
 loop_control_ioctl+0x564/0x620 drivers/block/loop.c:2309
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x114/0x190 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x34/0x70
 entry_SYSCALL_64_after_hwframe+0x61/0xc6
RIP: 0033:0x7ff4ded0bea9
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 e1 20 00 00 90 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 b0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ff4dda7f0c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007ff4dee39f80 RCX: 00007ff4ded0bea9
RDX: 000000000040000c RSI: 0000000000004c81 RDI: 0000000000000003
RBP: 00007ff4ded584a4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007ff4dee39f80 R15: 00007ffc2a526e78
Modules linked in:
---[ end trace 7c9958bc004ae7d3 ]---
RIP: 0010:kill_device drivers/base/core.c:3369 [inline]
RIP: 0010:device_del+0xdf/0xf00 drivers/base/core.c:3397
Code: 20 42 80 3c 28 00 74 08 48 89 df e8 9b bc dd fe 4c 89 7c 24 40 41 bf d0 00 00 00 48 89 5c 24 18 4c 03 3b 4d 89 fc 49 c1 ec 03 <43> 0f b6 04 2c 84 c0 0f 85 0a 0d 00 00 41 0f b6 1f 89 de 83 e6 01
RSP: 0018:ffffc90000f67b80 EFLAGS: 00010202
RAX: 1ffff11021979e1a RBX: ffff88810cbcf0d0 RCX: ffffffff84b02565
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000f67b00
RBP: ffffc90000f67c70 R08: dffffc0000000000 R09: fffff520001ecf61
R10: 0000000000000000 R11: dffffc0000000001 R12: 000000000000001a
R13: dffffc0000000000 R14: ffff88810cbcf108 R15: 00000000000000d0
FS:  00007ff4dda7f6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020001b40 CR3: 000000011224f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	20 42 80             	and    %al,-0x80(%rdx)
   3:	3c 28                	cmp    $0x28,%al
   5:	00 74 08 48          	add    %dh,0x48(%rax,%rcx,1)
   9:	89 df                	mov    %ebx,%edi
   b:	e8 9b bc dd fe       	call   0xfeddbcab
  10:	4c 89 7c 24 40       	mov    %r15,0x40(%rsp)
  15:	41 bf d0 00 00 00    	mov    $0xd0,%r15d
  1b:	48 89 5c 24 18       	mov    %rbx,0x18(%rsp)
  20:	4c 03 3b             	add    (%rbx),%r15
  23:	4d 89 fc             	mov    %r15,%r12
  26:	49 c1 ec 03          	shr    $0x3,%r12
* 2a:	43 0f b6 04 2c       	movzbl (%r12,%r13,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 0a 0d 00 00    	jne    0xd41
  37:	41 0f b6 1f          	movzbl (%r15),%ebx
  3b:	89 de                	mov    %ebx,%esi
  3d:	83 e6 01             	and    $0x1,%esi