Oops: general protection fault, probably for non-canonical address 0xdffffc0000000003: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000018-0x000000000000001f]
CPU: 1 UID: 0 PID: 7843 Comm: syz.6.520 Not tainted 6.12.0-syzkaller-07834-g06afb0f36106 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: 40 98 cb fd 48 83 c4 08 e8 37 fc 21 08 89 c3 31 ff 89 c6 e8 6c 5e f0 fd 85 db 74 17 e8 23 f9 d5 fd 84 c0 74 1c e8 1a 5a f0 fd <43> 80 3c 3c 00 75 4b eb 51 e8 0c 5a f0 fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc9001f6bf6c0 EFLAGS: 00010293
RAX: ffffffff83a4f316 RBX: 0000000000000001 RCX: ffff88802b970000
RDX: 0000000000000000 RSI: ffffffff8c607280 RDI: ffffffff8c607240
RBP: ffffc9001f6bf8b0 R08: ffffffff83a4f304 R09: 1ffffffff285cb10
R10: dffffc0000000000 R11: fffffbfff285cb11 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  00007f66c11d56c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c38e6be CR3: 000000006829a000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 btrfs_read_lock_root_node+0x27/0xd0 fs/btrfs/locking.c:264
 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1005
 open_ctree+0x1fb1/0x2a30 fs/btrfs/disk-io.c:3520
 btrfs_fill_super fs/btrfs/super.c:972 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1894 [inline]
 btrfs_get_tree+0x1274/0x1a10 fs/btrfs/super.c:2105
 vfs_get_tree+0x92/0x2b0 fs/super.c:1814
 fc_mount+0x1b/0xb0 fs/namespace.c:1231
 btrfs_get_tree_subvol fs/btrfs/super.c:2068 [inline]
 btrfs_get_tree+0x65b/0x1a10 fs/btrfs/super.c:2106
 vfs_get_tree+0x92/0x2b0 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: 0033:0x7f66c337ffba
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:00007f66c11d4e68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f66c11d4ef0 RCX: 00007f66c337ffba
RDX: 0000000020000080 RSI: 0000000020000040 RDI: 00007f66c11d4eb0
RBP: 0000000020000080 R08: 00007f66c11d4ef0 R09: 000000000001c005
R10: 000000000001c005 R11: 0000000000000246 R12: 0000000020000040
R13: 00007f66c11d4eb0 R14: 00000000000055cb R15: 0000000020000e00
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:260
Code: 40 98 cb fd 48 83 c4 08 e8 37 fc 21 08 89 c3 31 ff 89 c6 e8 6c 5e f0 fd 85 db 74 17 e8 23 f9 d5 fd 84 c0 74 1c e8 1a 5a f0 fd <43> 80 3c 3c 00 75 4b eb 51 e8 0c 5a f0 fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc9001f6bf6c0 EFLAGS: 00010293
RAX: ffffffff83a4f316 RBX: 0000000000000001 RCX: ffff88802b970000
RDX: 0000000000000000 RSI: ffffffff8c607280 RDI: ffffffff8c607240
RBP: ffffc9001f6bf8b0 R08: ffffffff83a4f304 R09: 1ffffffff285cb10
R10: dffffc0000000000 R11: fffffbfff285cb11 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  00007f66c11d56c0(0000) GS:ffff8880b8600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9cb29afd58 CR3: 000000006829a000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	40 98                	rex cwtl
   2:	cb                   	lret
   3:	fd                   	std
   4:	48 83 c4 08          	add    $0x8,%rsp
   8:	e8 37 fc 21 08       	call   0x821fc44
   d:	89 c3                	mov    %eax,%ebx
   f:	31 ff                	xor    %edi,%edi
  11:	89 c6                	mov    %eax,%esi
  13:	e8 6c 5e f0 fd       	call   0xfdf05e84
  18:	85 db                	test   %ebx,%ebx
  1a:	74 17                	je     0x33
  1c:	e8 23 f9 d5 fd       	call   0xfdd5f944
  21:	84 c0                	test   %al,%al
  23:	74 1c                	je     0x41
  25:	e8 1a 5a f0 fd       	call   0xfdf05a44
* 2a:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1) <-- trapping instruction
  2f:	75 4b                	jne    0x7c
  31:	eb 51                	jmp    0x84
  33:	e8 0c 5a f0 fd       	call   0xfdf05a44
  38:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
  3d:	75 3d                	jne    0x7c
  3f:	eb                   	.byte 0xeb