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: 0 UID: 0 PID: 5306 Comm: syz-executor270 Not tainted 6.14.0-rc1-syzkaller-00235-g9946eaf552b1 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:193
Code: e0 4f c5 fd 48 83 c4 08 e8 e7 86 20 08 89 c3 31 ff 89 c6 e8 8c fa e9 fd 85 db 74 17 e8 53 b2 cf fd 84 c0 74 1c e8 3a f6 e9 fd <43> 80 3c 3c 00 75 4b eb 51 e8 2c f6 e9 fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc9000d26f6c0 EFLAGS: 00010293
RAX: ffffffff83d56966 RBX: 0000000000000001 RCX: ffff88801f7a2440
RDX: 0000000000000000 RSI: ffffffff8c608b20 RDI: ffffffff8c608ae0
RBP: ffffc9000d26f8b0 R08: ffffffff83d56954 R09: 1ffffffff285f308
R10: dffffc0000000000 R11: fffffbfff285f309 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055555d965380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6e46abd440 CR3: 0000000043f82000 CR4: 0000000000352ef0
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:264
 btrfs_build_ref_tree+0x112/0x16f0 fs/btrfs/ref-verify.c:1006
 open_ctree+0x202c/0x2ab0 fs/btrfs/disk-io.c:3593
 btrfs_fill_super fs/btrfs/super.c:972 [inline]
 btrfs_get_tree_super fs/btrfs/super.c:1898 [inline]
 btrfs_get_tree+0x12da/0x1a30 fs/btrfs/super.c:2093
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 fc_mount+0x1b/0xb0 fs/namespace.c:1271
 btrfs_get_tree_subvol fs/btrfs/super.c:2051 [inline]
 btrfs_get_tree+0x6b1/0x1a30 fs/btrfs/super.c:2094
 vfs_get_tree+0x90/0x2b0 fs/super.c:1814
 do_new_mount+0x2be/0xb40 fs/namespace.c:3560
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount+0x2d6/0x3c0 fs/namespace.c:4088
 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: 0033:0x7fa2263f9f7a
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:00007ffea0695288 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007ffea06952a0 RCX: 00007fa2263f9f7a
RDX: 0000400000000080 RSI: 0000400000000000 RDI: 00007ffea06952a0
RBP: 0000400000000080 R08: 00007ffea06952e0 R09: 00000000000055c5
R10: 000000000001c005 R11: 0000000000000282 R12: 0000400000000000
R13: 0000000000000004 R14: 0000000000000003 R15: 00007ffea06952e0
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:btrfs_root_node+0x86/0x3b0 fs/btrfs/ctree.c:193
Code: e0 4f c5 fd 48 83 c4 08 e8 e7 86 20 08 89 c3 31 ff 89 c6 e8 8c fa e9 fd 85 db 74 17 e8 53 b2 cf fd 84 c0 74 1c e8 3a f6 e9 fd <43> 80 3c 3c 00 75 4b eb 51 e8 2c f6 e9 fd 43 80 3c 3c 00 75 3d eb
RSP: 0018:ffffc9000d26f6c0 EFLAGS: 00010293
RAX: ffffffff83d56966 RBX: 0000000000000001 RCX: ffff88801f7a2440
RDX: 0000000000000000 RSI: ffffffff8c608b20 RDI: ffffffff8c608ae0
RBP: ffffc9000d26f8b0 R08: ffffffff83d56954 R09: 1ffffffff285f308
R10: dffffc0000000000 R11: fffffbfff285f309 R12: 0000000000000003
R13: dffffc0000000000 R14: 0000000000000018 R15: dffffc0000000000
FS:  000055555d965380(0000) GS:ffff88801fc00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056413606d098 CR3: 0000000043f82000 CR4: 0000000000352ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	4f c5 fd 48          	rex.WRXB (bad)
   4:	83 c4 08             	add    $0x8,%esp
   7:	e8 e7 86 20 08       	call   0x82086f3
   c:	89 c3                	mov    %eax,%ebx
   e:	31 ff                	xor    %edi,%edi
  10:	89 c6                	mov    %eax,%esi
  12:	e8 8c fa e9 fd       	call   0xfde9faa3
  17:	85 db                	test   %ebx,%ebx
  19:	74 17                	je     0x32
  1b:	e8 53 b2 cf fd       	call   0xfdcfb273
  20:	84 c0                	test   %al,%al
  22:	74 1c                	je     0x40
  24:	e8 3a f6 e9 fd       	call   0xfde9f663
* 29:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1) <-- trapping instruction
  2e:	75 4b                	jne    0x7b
  30:	eb 51                	jmp    0x83
  32:	e8 2c f6 e9 fd       	call   0xfde9f663
  37:	43 80 3c 3c 00       	cmpb   $0x0,(%r12,%r15,1)
  3c:	75 3d                	jne    0x7b
  3e:	eb                   	.byte 0xeb