RSP: 002b:00007fe8de3cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe8dfbfbfa0 RCX: 00007fe8df973e99
RDX: 000000000010000a RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007fe8dfa09eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe8dfbfc038 R14: 00007fe8dfbfbfa0 R15: 00007ffffb3de468
---[ end trace e8585f2ed620d62b ]---
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: 928 Comm: syz.3.129 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/25/2026
RIP: 0010:kill_device drivers/base/core.c:3388 [inline]
RIP: 0010:device_del+0xe0/0xe60 drivers/base/core.c:3416
Code: 42 80 3c 30 00 74 08 4c 89 ef e8 cb 10 f0 fe 41 bf d0 00 00 00 4d 03 7d 00 4d 89 fe 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 b7 0c 00 00 45 0f b6 27 44 89 e6 83 e6
RSP: 0018:ffffc90000e9fc20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88810f9af108 RCX: ffffffff8480ec62
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000e9fba0
RBP: ffffc90000e9fd10 R08: ffffc90000e9fba7 R09: 1ffff920001d3f74
R10: dffffc0000000000 R11: fffff520001d3f75 R12: ffff88810f9af068
R13: ffff88810f9af0d0 R14: 000000000000001a R15: 00000000000000d0
FS:  00007fe8de3cd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000113514000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 del_gendisk+0x85d/0xa10 block/genhd.c:953
 loop_remove+0x46/0xb0 drivers/block/loop.c:2210
 loop_control_ioctl+0x4a6/0x570 drivers/block/loop.c:2309
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl+0x121/0x1a0 fs/ioctl.c:739
 __x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:739
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fe8df973e99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe8de3cd028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fe8dfbfbfa0 RCX: 00007fe8df973e99
RDX: 000000000010000a RSI: 0000000000004c81 RDI: 0000000000000005
RBP: 00007fe8dfa09eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe8dfbfc038 R14: 00007fe8dfbfbfa0 R15: 00007ffffb3de468
Modules linked in:
---[ end trace e8585f2ed620d62c ]---
RIP: 0010:kill_device drivers/base/core.c:3388 [inline]
RIP: 0010:device_del+0xe0/0xe60 drivers/base/core.c:3416
Code: 42 80 3c 30 00 74 08 4c 89 ef e8 cb 10 f0 fe 41 bf d0 00 00 00 4d 03 7d 00 4d 89 fe 49 c1 ee 03 48 b8 00 00 00 00 00 fc ff df <41> 0f b6 04 06 84 c0 0f 85 b7 0c 00 00 45 0f b6 27 44 89 e6 83 e6
RSP: 0018:ffffc90000e9fc20 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff88810f9af108 RCX: ffffffff8480ec62
RDX: 0000000000000001 RSI: 0000000000000008 RDI: ffffc90000e9fba0
RBP: ffffc90000e9fd10 R08: ffffc90000e9fba7 R09: 1ffff920001d3f74
R10: dffffc0000000000 R11: fffff520001d3f75 R12: ffff88810f9af068
R13: ffff88810f9af0d0 R14: 000000000000001a R15: 00000000000000d0
FS:  00007fe8de3cd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000113514000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	42 80 3c 30 00       	cmpb   $0x0,(%rax,%r14,1)
   5:	74 08                	je     0xf
   7:	4c 89 ef             	mov    %r13,%rdi
   a:	e8 cb 10 f0 fe       	call   0xfef010da
   f:	41 bf d0 00 00 00    	mov    $0xd0,%r15d
  15:	4d 03 7d 00          	add    0x0(%r13),%r15
  19:	4d 89 fe             	mov    %r15,%r14
  1c:	49 c1 ee 03          	shr    $0x3,%r14
  20:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  27:	fc ff df
* 2a:	41 0f b6 04 06       	movzbl (%r14,%rax,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	0f 85 b7 0c 00 00    	jne    0xcee
  37:	45 0f b6 27          	movzbl (%r15),%r12d
  3b:	44 89 e6             	mov    %r12d,%esi
  3e:	83                   	.byte 0x83
  3f:	e6                   	.byte 0xe6