loop0: detected capacity change from 0 to 1024
hfsplus: (loop0): Attributes File (cnid 0x8) map record invalid or bitmap corruption detected, forcing read-only.
hfsplus: Run fsck.hfsplus to repair.
hfsplus: trying to free the freed bnode 1(1)
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000005: 0000 [#1] SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000028-0x000000000000002f]
CPU: 0 UID: 0 PID: 5342 Comm: syz.0.0 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
RIP: 0010:hfsplus_cat_write_inode+0xc4/0xb40 fs/hfsplus/inode.c:688
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 3d 7b 0e ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 3d 14 81 ff 41 be 78 06 00 00 4c
RSP: 0018:ffffc9000f337880 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92001e66f18 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000002ff2 RDI: 0000000000002ff3
RBP: ffffc9000f337c30 R08: ffffc9000f3377e7 R09: 0000000000000000
R10: fffff52001e66f28 R11: fffff52001e66efd R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880543826d8 R15: 0000000000000028
FS:  00007f6d0fb186c0(0000) GS:ffff88808b0a5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fcc96980000 CR3: 0000000013e41000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 hfsplus_unlink+0x5e0/0x8e0 fs/hfsplus/dir.c:429
 vfs_unlink+0x27b/0x6d0 fs/namei.c:5659
 filename_unlinkat+0x3cd/0x610 fs/namei.c:5729
 __do_sys_unlinkat fs/namei.c:5758 [inline]
 __se_sys_unlinkat+0x83/0x1a0 fs/namei.c:5750
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f6d0eb9f559
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:00007f6d0fb17fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000107
RAX: ffffffffffffffda RBX: 00007f6d0ee25fa0 RCX: 00007f6d0eb9f559
RDX: 0000000000000000 RSI: 0000200000000c40 RDI: ffffffffffffff9c
RBP: 00007f6d0ec36b20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6d0ee26038 R14: 00007f6d0ee25fa0 R15: 00007fffeb2c6698
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:hfsplus_cat_write_inode+0xc4/0xb40 fs/hfsplus/inode.c:688
Code: 51 4a 89 44 2b 59 66 42 c7 44 2b 61 f3 f3 42 c6 44 2b 63 f3 e8 3d 7b 0e ff 4d 8d 7c 24 28 4c 89 f8 48 c1 e8 03 48 89 44 24 38 <42> 80 3c 28 00 74 08 4c 89 ff e8 3d 14 81 ff 41 be 78 06 00 00 4c
RSP: 0018:ffffc9000f337880 EFLAGS: 00010206
RAX: 0000000000000005 RBX: 1ffff92001e66f18 RCX: 0000000000100000
RDX: ffffc90020001000 RSI: 0000000000002ff2 RDI: 0000000000002ff3
RBP: ffffc9000f337c30 R08: ffffc9000f3377e7 R09: 0000000000000000
R10: fffff52001e66f28 R11: fffff52001e66efd R12: 0000000000000000
R13: dffffc0000000000 R14: ffff8880543826d8 R15: 0000000000000028
FS:  00007f6d0fb186c0(0000) GS:ffff88808b0a5000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005584fe3b3590 CR3: 0000000013e41000 CR4: 0000000000352ef0
----------------
Code disassembly (best guess):
   0:	51                   	push   %rcx
   1:	4a 89 44 2b 59       	mov    %rax,0x59(%rbx,%r13,1)
   6:	66 42 c7 44 2b 61 f3 	movw   $0xf3f3,0x61(%rbx,%r13,1)
   d:	f3
   e:	42 c6 44 2b 63 f3    	movb   $0xf3,0x63(%rbx,%r13,1)
  14:	e8 3d 7b 0e ff       	call   0xff0e7b56
  19:	4d 8d 7c 24 28       	lea    0x28(%r12),%r15
  1e:	4c 89 f8             	mov    %r15,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 38       	mov    %rax,0x38(%rsp)
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	4c 89 ff             	mov    %r15,%rdi
  34:	e8 3d 14 81 ff       	call   0xff811476
  39:	41 be 78 06 00 00    	mov    $0x678,%r14d
  3f:	4c                   	rex.WR