Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 0 UID: 0 PID: 5840 Comm: syz-executor163 Not tainted 6.16.0-rc5-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193
Code: b7 c3 e3 fd 48 83 c4 08 e8 5e 96 ad 07 89 c5 31 ff 89 c6 e8 c3 bf 05 fe 85 ed 74 17 e8 3a b5 ec fd 84 c0 74 1c e8 71 bb 05 fe <42> 80 3c 2b 00 75 4b eb 51 e8 63 bb 05 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000403f710 EFLAGS: 00010293
RAX: ffffffff83ba696f RBX: 0000000000000003 RCX: ffff888033858000
RDX: 0000000000000000 RSI: ffffffff8be1c1e0 RDI: ffffffff8be1c1a0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83ba692c
R10: dffffc0000000000 R11: ffffed100e6c500e R12: ffffffff83ba692c
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000
FS:  000055559500a380(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e309b8c168 CR3: 0000000071dd2000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:263
 btrfs_build_ref_tree+0x110/0x13e0 fs/btrfs/ref-verify.c:1006
 open_ctree+0x1d81/0x2800 fs/btrfs/disk-io.c:3595
 btrfs_fill_super+0x19d/0x2e0 fs/btrfs/super.c:968
 btrfs_get_tree_super fs/btrfs/super.c:1893 [inline]
 btrfs_get_tree+0x107c/0x1630 fs/btrfs/super.c:2088
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804
 fc_mount+0x1c/0xb0 fs/namespace.c:1290
 btrfs_get_tree_subvol fs/btrfs/super.c:2046 [inline]
 btrfs_get_tree+0x67d/0x1630 fs/btrfs/super.c:2089
 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804
 do_new_mount+0x24a/0xa40 fs/namespace.c:3902
 do_mount fs/namespace.c:4239 [inline]
 __do_sys_mount fs/namespace.c:4450 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4427
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f2a1afeea7a
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:00007fff597c50e8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fff597c5100 RCX: 00007f2a1afeea7a
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 00007fff597c5100
RBP: 00002000000000c0 R08: 00007fff597c5140 R09: 00000000000055c5
R10: 000000000001c005 R11: 0000000000000282 R12: 0000200000000080
R13: 0000000000000004 R14: 0000000000000003 R15: 00007fff597c5140
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193
Code: b7 c3 e3 fd 48 83 c4 08 e8 5e 96 ad 07 89 c5 31 ff 89 c6 e8 c3 bf 05 fe 85 ed 74 17 e8 3a b5 ec fd 84 c0 74 1c e8 71 bb 05 fe <42> 80 3c 2b 00 75 4b eb 51 e8 63 bb 05 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000403f710 EFLAGS: 00010293
RAX: ffffffff83ba696f RBX: 0000000000000003 RCX: ffff888033858000
RDX: 0000000000000000 RSI: ffffffff8be1c1e0 RDI: ffffffff8be1c1a0
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff83ba692c
R10: dffffc0000000000 R11: ffffed100e6c500e R12: ffffffff83ba692c
R13: dffffc0000000000 R14: 0000000000000018 R15: 0000000000000000
FS:  000055559500a380(0000) GS:ffff888125c51000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055e309b8c168 CR3: 0000000071dd2000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	b7 c3                	mov    $0xc3,%bh
   2:	e3 fd                	jrcxz  0x1
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	e8 5e 96 ad 07       	call   0x7ad966b
   d:	89 c5                	mov    %eax,%ebp
   f:	31 ff                	xor    %edi,%edi
  11:	89 c6                	mov    %eax,%esi
  13:	e8 c3 bf 05 fe       	call   0xfe05bfdb
  18:	85 ed                	test   %ebp,%ebp
  1a:	74 17                	je     0x33
  1c:	e8 3a b5 ec fd       	call   0xfdecb55b
  21:	84 c0                	test   %al,%al
  23:	74 1c                	je     0x41
  25:	e8 71 bb 05 fe       	call   0xfe05bb9b
* 2a:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1) <-- trapping instruction
  2f:	75 4b                	jne    0x7c
  31:	eb 51                	jmp    0x84
  33:	e8 63 bb 05 fe       	call   0xfe05bb9b
  38:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1)
  3d:	75 3d                	jne    0x7c
  3f:	eb                   	.byte 0xeb