RAX: ffffffffffffffda RBX: 00007f32504d2f80 RCX: 00007f32503b3ae9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004
RBP: 00007f32503ff47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f32504d2f80 R15: 00007ffe31ad7cf8
---[ end trace 2209fc39dfc3c28d ]---
general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 0 PID: 333 Comm: syz-executor.0 Tainted: G        W         5.10.238-syzkaller-1007487-g59e9a7228857 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:strlen+0x29/0x70 lib/string.c:568
Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00
RSP: 0018:ffffc90000f47c40 EFLAGS: 00010246
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffff88810cbf3b40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f47c60 R08: dffffc0000000000 R09: ffffed102000b22f
R10: ffffed102000b22f R11: 1ffff1102000b22e R12: ffff8881083ca270
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007f324ff366c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe31ad8008 CR3: 0000000106fc6000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 kernfs_name_hash fs/kernfs/dir.c:309 [inline]
 kernfs_find_ns+0x95/0x4b0 fs/kernfs/dir.c:892
 kernfs_remove_by_name_ns+0x89/0x160 fs/kernfs/dir.c:1595
 kernfs_remove_by_name include/linux/kernfs.h:623 [inline]
 sysfs_remove_link+0x50/0x60 fs/sysfs/symlink.c:152
 del_gendisk+0x822/0x9e0 block/genhd.c:951
 loop_remove+0x46/0xb0 drivers/block/loop.c:2210
 loop_control_ioctl+0x487/0x550 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: 0033:0x7f32503b3ae9
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:00007f324ff360c8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f32504d2f80 RCX: 00007f32503b3ae9
RDX: 0000000000000000 RSI: 0000000000004c81 RDI: 0000000000000004
RBP: 00007f32503ff47a R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 000000000000000b R14: 00007f32504d2f80 R15: 00007ffe31ad7cf8
Modules linked in:
---[ end trace 2209fc39dfc3c28e ]---
RIP: 0010:strlen+0x29/0x70 lib/string.c:568
Code: 00 55 48 89 e5 41 57 41 56 41 54 53 48 c7 c0 ff ff ff ff 49 be 00 00 00 00 00 fc ff df 48 89 fb 49 89 c7 48 89 d8 48 c1 e8 03 <42> 0f b6 04 30 84 c0 75 11 48 ff c3 49 8d 47 01 42 80 7c 3f 01 00
RSP: 0018:ffffc90000f47c40 EFLAGS: 00010246

RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000001
RDX: ffff88810cbf3b40 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000f47c60 R08: dffffc0000000000 R09: ffffed102000b22f
R10: ffffed102000b22f R11: 1ffff1102000b22e R12: ffff8881083ca270
R13: 0000000000000000 R14: dffffc0000000000 R15: ffffffffffffffff
FS:  00007f324ff366c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe31ad8008 CR3: 0000000106fc6000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	00 55 48             	add    %dl,0x48(%rbp)
   3:	89 e5                	mov    %esp,%ebp
   5:	41 57                	push   %r15
   7:	41 56                	push   %r14
   9:	41 54                	push   %r12
   b:	53                   	push   %rbx
   c:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
  13:	49 be 00 00 00 00 00 	movabs $0xdffffc0000000000,%r14
  1a:	fc ff df
  1d:	48 89 fb             	mov    %rdi,%rbx
  20:	49 89 c7             	mov    %rax,%r15
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 0f b6 04 30       	movzbl (%rax,%r14,1),%eax <-- trapping instruction
  2f:	84 c0                	test   %al,%al
  31:	75 11                	jne    0x44
  33:	48 ff c3             	inc    %rbx
  36:	49 8d 47 01          	lea    0x1(%r15),%rax
  3a:	42 80 7c 3f 01 00    	cmpb   $0x0,0x1(%rdi,%r15,1)