general protection fault, probably for non-canonical address 0xdffffc0000000000: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]
CPU: 1 PID: 6603 Comm: syz.5.519 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:btrfs_root_node+0x4f/0x350 fs/btrfs/ctree.c:132
Code: 87 2e fe e8 c3 56 01 00 e8 4e 21 73 06 89 c5 31 ff 89 c6 e8 b3 fb 41 fe 85 ed 74 17 e8 9a dc 2d fe 84 c0 74 1c e8 41 f8 41 fe <42> 80 3c 23 00 75 4b eb 51 e8 33 f8 41 fe 42 80 3c 23 00 75 3d eb
RSP: 0018:ffffc90003ce7588 EFLAGS: 00010287
RAX: ffffffff8335d2df RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90016c01000 RSI: 000000000005d543 RDI: 000000000005d544
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1ff7819
R10: fffffbfff1ff7819 R11: 1ffffffff1ff7818 R12: dffffc0000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f11959a16c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0560b37000 CR3: 000000007f4f4000 CR4: 00000000003506e0
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x75/0x390 fs/btrfs/locking.c:276
 btrfs_build_ref_tree+0x133/0x1180 fs/btrfs/ref-verify.c:993
 open_ctree+0x26dd/0x3250 fs/btrfs/disk-io.c:3609
 btrfs_fill_super+0x1c2/0x2e0 fs/btrfs/super.c:1387
 btrfs_mount_root+0x857/0x8c0 fs/btrfs/super.c:1751
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 fc_mount fs/namespace.c:996 [inline]
 vfs_kern_mount+0xba/0x150 fs/namespace.c:1026
 btrfs_mount+0x2d7/0xa50 fs/btrfs/super.c:1811
 legacy_get_tree+0xe6/0x180 fs/fs_context.c:611
 vfs_get_tree+0x88/0x270 fs/super.c:1530
 do_new_mount+0x24a/0xa40 fs/namespace.c:3025
 do_mount fs/namespace.c:3368 [inline]
 __do_sys_mount fs/namespace.c:3576 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:3553
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f119773b3ca
Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 de 1a 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f11959a0e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f11959a0ef0 RCX: 00007f119773b3ca
RDX: 0000200000000080 RSI: 0000200000000040 RDI: 00007f11959a0eb0
RBP: 0000200000000080 R08: 00007f11959a0ef0 R09: 000000000001c045
R10: 000000000001c045 R11: 0000000000000246 R12: 0000200000000040
R13: 00007f11959a0eb0 R14: 00000000000055cb R15: 0000200000000480
 </TASK>
Modules linked in:
---[ end trace ac29eaa222b9dbbc ]---
RIP: 0010:btrfs_root_node+0x4f/0x350 fs/btrfs/ctree.c:132
Code: 87 2e fe e8 c3 56 01 00 e8 4e 21 73 06 89 c5 31 ff 89 c6 e8 b3 fb 41 fe 85 ed 74 17 e8 9a dc 2d fe 84 c0 74 1c e8 41 f8 41 fe <42> 80 3c 23 00 75 4b eb 51 e8 33 f8 41 fe 42 80 3c 23 00 75 3d eb
RSP: 0018:ffffc90003ce7588 EFLAGS: 00010287
RAX: ffffffff8335d2df RBX: 0000000000000000 RCX: 0000000000080000
RDX: ffffc90016c01000 RSI: 000000000005d543 RDI: 000000000005d544
RBP: 0000000000000001 R08: dffffc0000000000 R09: fffffbfff1ff7819
R10: fffffbfff1ff7819 R11: 1ffffffff1ff7818 R12: dffffc0000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
FS:  00007f11959a16c0(0000) GS:ffff8880b9100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200001000000 CR3: 000000007f4f4000 CR4: 00000000003506e0
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	2e fe                	cs (bad)
   2:	e8 c3 56 01 00       	call   0x156ca
   7:	e8 4e 21 73 06       	call   0x673215a
   c:	89 c5                	mov    %eax,%ebp
   e:	31 ff                	xor    %edi,%edi
  10:	89 c6                	mov    %eax,%esi
  12:	e8 b3 fb 41 fe       	call   0xfe41fbca
  17:	85 ed                	test   %ebp,%ebp
  19:	74 17                	je     0x32
  1b:	e8 9a dc 2d fe       	call   0xfe2ddcba
  20:	84 c0                	test   %al,%al
  22:	74 1c                	je     0x40
  24:	e8 41 f8 41 fe       	call   0xfe41f86a
* 29:	42 80 3c 23 00       	cmpb   $0x0,(%rbx,%r12,1) <-- trapping instruction
  2e:	75 4b                	jne    0x7b
  30:	eb 51                	jmp    0x83
  32:	e8 33 f8 41 fe       	call   0xfe41f86a
  37:	42 80 3c 23 00       	cmpb   $0x0,(%rbx,%r12,1)
  3c:	75 3d                	jne    0x7b
  3e:	eb                   	.byte 0xeb