BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 80000001079d5067 P4D 80000001079d5067 PUD 109ea2067 PMD 0 
Oops: 0000 [#1] SMP PTI
CPU: 0 PID: 3628 Comm: syz.2.15 Not tainted 5.10.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:btrfs_root_node+0x2a/0x90 fs/btrfs/ctree.c:129
Code: 41 54 55 48 c7 c5 3e d6 5b 81 53 48 89 fb 31 d2 55 45 31 c9 45 31 c0 31 f6 b9 02 00 00 00 48 c7 c7 40 c5 35 83 e8 96 7c bb ff <4c> 8b 23 5a 41 8b 44 24 60 85 c0 74 32 49 8d 54 24 60 8d 48 01 f0
RSP: 0018:ffffc90000ca7d38 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000ef95c707
RDX: 00000000e74b46f9 RSI: 00000000b674fed7 RDI: 000000003920c830
RBP: ffffffff815bd63e R08: 0000000000020026 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881079f4540 R14: ffffc90000ca7e80 R15: ffff88810af68000
FS:  00007f08905c56c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001107d4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 __btrfs_read_lock_root_node+0x25/0x50 fs/btrfs/locking.c:573
 btrfs_search_slot_get_root fs/btrfs/ctree.c:2619 [inline]
 btrfs_search_slot+0x49d/0x9b0 fs/btrfs/ctree.c:2718
 extent_from_logical+0x6a/0x1b0 fs/btrfs/backref.c:1758
 iterate_inodes_from_logical+0x5b/0xd0 fs/btrfs/backref.c:2031
 btrfs_ioctl_logical_to_ino+0xaf/0x190 fs/btrfs/ioctl.c:3898
 vfs_ioctl fs/ioctl.c:48 [inline]
 __do_sys_ioctl fs/ioctl.c:753 [inline]
 __se_sys_ioctl fs/ioctl.c:739 [inline]
 __x64_sys_ioctl+0x7e/0xb0 fs/ioctl.c:739
 do_syscall_64+0x34/0x50 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x44/0xa9
RIP: 0033:0x7f0891345719
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:00007f08905c5038 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f08914fcf80 RCX: 00007f0891345719
RDX: 0000000020000080 RSI: 00000000c0389424 RDI: 0000000000000004
RBP: 00007f08913b832e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f08914fcf80 R15: 00007ffcebbbb708
Modules linked in:
CR2: 0000000000000000
---[ end trace 2ad93453aba18f40 ]---
RIP: 0010:btrfs_root_node+0x2a/0x90 fs/btrfs/ctree.c:129
Code: 41 54 55 48 c7 c5 3e d6 5b 81 53 48 89 fb 31 d2 55 45 31 c9 45 31 c0 31 f6 b9 02 00 00 00 48 c7 c7 40 c5 35 83 e8 96 7c bb ff <4c> 8b 23 5a 41 8b 44 24 60 85 c0 74 32 49 8d 54 24 60 8d 48 01 f0
RSP: 0018:ffffc90000ca7d38 EFLAGS: 00010246
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 00000000ef95c707
RDX: 00000000e74b46f9 RSI: 00000000b674fed7 RDI: 000000003920c830
RBP: ffffffff815bd63e R08: 0000000000020026 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: ffff8881079f4540 R14: ffffc90000ca7e80 R15: ffff88810af68000
FS:  00007f08905c56c0(0000) GS:ffff888237c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001107d4000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	41 54                	push   %r12
   2:	55                   	push   %rbp
   3:	48 c7 c5 3e d6 5b 81 	mov    $0xffffffff815bd63e,%rbp
   a:	53                   	push   %rbx
   b:	48 89 fb             	mov    %rdi,%rbx
   e:	31 d2                	xor    %edx,%edx
  10:	55                   	push   %rbp
  11:	45 31 c9             	xor    %r9d,%r9d
  14:	45 31 c0             	xor    %r8d,%r8d
  17:	31 f6                	xor    %esi,%esi
  19:	b9 02 00 00 00       	mov    $0x2,%ecx
  1e:	48 c7 c7 40 c5 35 83 	mov    $0xffffffff8335c540,%rdi
  25:	e8 96 7c bb ff       	call   0xffbb7cc0
* 2a:	4c 8b 23             	mov    (%rbx),%r12 <-- trapping instruction
  2d:	5a                   	pop    %rdx
  2e:	41 8b 44 24 60       	mov    0x60(%r12),%eax
  33:	85 c0                	test   %eax,%eax
  35:	74 32                	je     0x69
  37:	49 8d 54 24 60       	lea    0x60(%r12),%rdx
  3c:	8d 48 01             	lea    0x1(%rax),%ecx
  3f:	f0                   	lock