Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 5831 Comm: syz-executor118 Not tainted 6.12.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: e0 bb c5 fd 48 83 c4 08 e8 c7 63 14 08 89 c3 31 ff 89 c6 e8 dc 52 ea fd 85 db 74 17 e8 e3 3b d0 fd 84 c0 74 1c e8 8a 4e ea fd <43> 80 3c 3c 00 75 4b eb 51 e8 7c 4e ea fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc90003df76c0 EFLAGS: 00010293
RAX: ffffffff83aa8b26 RBX: 0000000000000001 RCX: ffff888024339e00
RDX: 0000000000000000 RSI: ffffffff8c603640 RDI: ffffffff8c603600
RBP: ffffc90003df78b0 R08: ffffffff83aa8b14 R09: 1ffffffff2853100
R10: dffffc0000000000 R11: fffffbfff2853101 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055556ec02380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa03db78a0 CR3: 000000007a8b0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:279
 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1005
 open_ctree+0x1fd0/0x2a50 fs/btrfs/disk-io.c:3523
 btrfs_fill_super fs/btrfs/super.c:974 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1896 [inline]
 btrfs_get_tree+0x1276/0x1a10 fs/btrfs/super.c:2107
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 fc_mount+0x1b/0xb0 fs/namespace.c:1231
 btrfs_get_tree_subvol fs/btrfs/super.c:2070 [inline]
 btrfs_get_tree+0x65b/0x1a10 fs/btrfs/super.c:2108
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3507
 do_mount fs/namespace.c:3847 [inline]
 __do_sys_mount fs/namespace.c:4057 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4034
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7feff06b7a4a
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc4d92d5a8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffc4d92d5b0 RCX: 00007feff06b7a4a
RDX: 0000000020000080 RSI: 0000000020000000 RDI: 00007ffc4d92d5b0
RBP: 0000000000000004 R08: 00007ffc4d92d5f0 R09: 00000000000055c5
R10: 000000000001c005 R11: 0000000000000282 R12: 00007ffc4d92d5f0
R13: 0000000000000003 R14: 0000000001000000 R15: 0000000000000001
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: e0 bb c5 fd 48 83 c4 08 e8 c7 63 14 08 89 c3 31 ff 89 c6 e8 dc 52 ea fd 85 db 74 17 e8 e3 3b d0 fd 84 c0 74 1c e8 8a 4e ea fd <43> 80 3c 3c 00 75 4b eb 51 e8 7c 4e ea fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc90003df76c0 EFLAGS: 00010293
RAX: ffffffff83aa8b26 RBX: 0000000000000001 RCX: ffff888024339e00
RDX: 0000000000000000 RSI: ffffffff8c603640 RDI: ffffffff8c603600
RBP: ffffc90003df78b0 R08: ffffffff83aa8b14 R09: 1ffffffff2853100
R10: dffffc0000000000 R11: fffffbfff2853101 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055556ec02380(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055fa03db78a0 CR3: 000000007a8b0000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 3 bytes skipped:
   0:	fd                   	std
   1:	48 83 c4 08          	add    $0x8,%rsp
   5:	e8 c7 63 14 08       	call   0x81463d1
   a:	89 c3                	mov    %eax,%ebx
   c:	31 ff                	xor    %edi,%edi
   e:	89 c6                	mov    %eax,%esi
  10:	e8 dc 52 ea fd       	call   0xfdea52f1
  15:	85 db                	test   %ebx,%ebx
  17:	74 17                	je     0x30
  19:	e8 e3 3b d0 fd       	call   0xfdd03c01
  1e:	84 c0                	test   %al,%al
  20:	74 1c                	je     0x3e
  22:	e8 8a 4e ea fd       	call   0xfdea4eb1
* 27:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1) <-- trapping instruction
  2c:	75 4b                	jne    0x79
  2e:	eb 51                	jmp    0x81
  30:	e8 7c 4e ea fd       	call   0xfdea4eb1
  35:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
  3a:	75 3d                	jne    0x79
  3c:	eb                   	.byte 0xeb