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: 5825 Comm: syz-executor202 Not tainted 6.15.0-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: e7 1a e8 fd 48 83 c4 08 e8 ee 7a 99 07 89 c5 31 ff 89 c6 e8 b3 d1 09 fe 85 ed 74 17 e8 0a f5 f0 fd 84 c0 74 1c e8 61 cd 09 fe <42> 80 3c 2b 00 75 4b eb 51 e8 53 cd 09 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000449f750 EFLAGS: 00010293
RAX: ffffffff83b6237f RBX: 0000000000000003 RCX: ffff8880783d9e00
RDX: 0000000000000000 RSI: ffffffff8bc12220 RDI: ffffffff8bc121e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b6233c R12: ffffffff83b6233c
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880327d5420
FS:  000055555a8cb380(0000) GS:ffff8881260f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005632094765f8 CR3: 000000003242e000 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:263
 btrfs_build_ref_tree+0x112/0x12b0 fs/btrfs/ref-verify.c:1006
 open_ctree+0x1d7e/0x2800 fs/btrfs/disk-io.c:3591
 btrfs_fill_super+0x19d/0x2e0 fs/btrfs/super.c:976
 btrfs_get_tree_super fs/btrfs/super.c:1901 [inline]
 btrfs_get_tree+0x107c/0x1620 fs/btrfs/super.c:2096
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 fc_mount+0x1c/0xb0 fs/namespace.c:1289
 btrfs_get_tree_subvol fs/btrfs/super.c:2054 [inline]
 btrfs_get_tree+0x67d/0x1620 fs/btrfs/super.c:2097
 vfs_get_tree+0x92/0x2b0 fs/super.c:1759
 do_new_mount+0x24a/0xa40 fs/namespace.c:3881
 do_mount fs/namespace.c:4221 [inline]
 __do_sys_mount fs/namespace.c:4432 [inline]
 __se_sys_mount+0x317/0x410 fs/namespace.c:4409
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xf6/0x210 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe94ab38faa
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:00007ffd0daca588 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffd0daca5a0 RCX: 00007fe94ab38faa
RDX: 0000200000000080 RSI: 00002000000000c0 RDI: 00007ffd0daca5a0
RBP: 00002000000000c0 R08: 00007ffd0daca5e0 R09: 00000000000055db
R10: 000000000001c005 R11: 0000000000000282 R12: 0000200000000080
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffd0daca5e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x7f/0x3b0 fs/btrfs/ctree.c:193
Code: e7 1a e8 fd 48 83 c4 08 e8 ee 7a 99 07 89 c5 31 ff 89 c6 e8 b3 d1 09 fe 85 ed 74 17 e8 0a f5 f0 fd 84 c0 74 1c e8 61 cd 09 fe <42> 80 3c 2b 00 75 4b eb 51 e8 53 cd 09 fe 42 80 3c 2b 00 75 3d eb
RSP: 0018:ffffc9000449f750 EFLAGS: 00010293
RAX: ffffffff83b6237f RBX: 0000000000000003 RCX: ffff8880783d9e00
RDX: 0000000000000000 RSI: ffffffff8bc12220 RDI: ffffffff8bc121e0
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff83b6233c R12: ffffffff83b6233c
R13: dffffc0000000000 R14: 0000000000000018 R15: ffff8880327d5420
FS:  000055555a8cb380(0000) GS:ffff8881261f6000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fb4dbd10e9c CR3: 000000003242e000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	1a e8                	sbb    %al,%ch
   2:	fd                   	std
   3:	48 83 c4 08          	add    $0x8,%rsp
   7:	e8 ee 7a 99 07       	call   0x7997afa
   c:	89 c5                	mov    %eax,%ebp
   e:	31 ff                	xor    %edi,%edi
  10:	89 c6                	mov    %eax,%esi
  12:	e8 b3 d1 09 fe       	call   0xfe09d1ca
  17:	85 ed                	test   %ebp,%ebp
  19:	74 17                	je     0x32
  1b:	e8 0a f5 f0 fd       	call   0xfdf0f52a
  20:	84 c0                	test   %al,%al
  22:	74 1c                	je     0x40
  24:	e8 61 cd 09 fe       	call   0xfe09cd8a
* 29:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1) <-- trapping instruction
  2e:	75 4b                	jne    0x7b
  30:	eb 51                	jmp    0x83
  32:	e8 53 cd 09 fe       	call   0xfe09cd8a
  37:	42 80 3c 2b 00       	cmpb   $0x0,(%rbx,%r13,1)
  3c:	75 3d                	jne    0x7b
  3e:	eb                   	.byte 0xeb