Oops: general protection fault, probably for non-canonical address 0xdffffc000000000d: 0000 [#1] PREEMPT SMP KASAN NOPTI
KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]
CPU: 1 UID: 0 PID: 7371 Comm: syz.4.414 Not tainted 6.13.0-syzkaller-09585-gb4b0881156fb #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024
RIP: 0010:__d_unalias fs/dcache.c:2969 [inline]
RIP: 0010:d_splice_alias+0x9cd/0xf30 fs/dcache.c:3037
Code: 48 c1 ea 03 80 3c 02 00 0f 85 4e 05 00 00 49 8b 85 70 ff ff ff 48 ba 00 00 00 00 00 fc ff df 48 8d 78 68 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 14 05 00 00 48 8b 40 68 48 85 c0 74 31 48 89 44
RSP: 0018:ffffc9000521f668 EFLAGS: 00010212
RAX: 0000000000000000 RBX: ffff88807f9ac5e0 RCX: 000000000000000d
RDX: dffffc0000000000 RSI: ffffffff82348ecc RDI: 0000000000000068
RBP: ffff88805b079100 R08: 0000000000000000 R09: ffffed100ff0e394
R10: ffff88807f871ca3 R11: 0000000000000089 R12: ffff88807f871be8
R13: ffff88807b7d6e60 R14: ffff88807b7d6d38 R15: ffff88807b7d6dd0
FS:  00007f8ee9ff66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555c2225c8 CR3: 0000000025306000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 __lookup_slow+0x252/0x470 fs/namei.c:1793
 lookup_slow fs/namei.c:1810 [inline]
 walk_component+0x350/0x5b0 fs/namei.c:2114
 lookup_last fs/namei.c:2612 [inline]
 path_lookupat+0x17f/0x770 fs/namei.c:2636
 filename_lookup+0x221/0x5f0 fs/namei.c:2665
 kern_path+0x35/0x50 fs/namei.c:2773
 ovl_mount_dir_noesc fs/overlayfs/params.c:237 [inline]
 ovl_mount_dir+0x13e/0x1f0 fs/overlayfs/params.c:268
 ovl_kern_path fs/overlayfs/params.c:387 [inline]
 ovl_parse_layer fs/overlayfs/params.c:436 [inline]
 ovl_parse_param+0xf33/0x13d0 fs/overlayfs/params.c:624
 vfs_parse_fs_param+0x20b/0x3c0 fs/fs_context.c:146
 vfs_parse_fs_string+0xea/0x150 fs/fs_context.c:188
 vfs_parse_monolithic_sep+0x175/0x1f0 fs/fs_context.c:230
 do_new_mount fs/namespace.c:3556 [inline]
 path_mount+0x149f/0x1f10 fs/namespace.c:3887
 do_mount fs/namespace.c:3900 [inline]
 __do_sys_mount fs/namespace.c:4111 [inline]
 __se_sys_mount fs/namespace.c:4088 [inline]
 __x64_sys_mount+0x28f/0x310 fs/namespace.c:4088
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcd/0x250 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f8eec18cda9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 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:00007f8ee9ff6038 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007f8eec3a6160 RCX: 00007f8eec18cda9
RDX: 0000000020000080 RSI: 00000000200000c0 RDI: 0000000000000000
RBP: 00007f8eec20e2a0 R08: 0000000020000400 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000001 R14: 00007f8eec3a6160 R15: 00007ffd8b3592e8
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:__d_unalias fs/dcache.c:2969 [inline]
RIP: 0010:d_splice_alias+0x9cd/0xf30 fs/dcache.c:3037
Code: 48 c1 ea 03 80 3c 02 00 0f 85 4e 05 00 00 49 8b 85 70 ff ff ff 48 ba 00 00 00 00 00 fc ff df 48 8d 78 68 48 89 f9 48 c1 e9 03 <80> 3c 11 00 0f 85 14 05 00 00 48 8b 40 68 48 85 c0 74 31 48 89 44
RSP: 0018:ffffc9000521f668 EFLAGS: 00010212
RAX: 0000000000000000 RBX: ffff88807f9ac5e0 RCX: 000000000000000d
RDX: dffffc0000000000 RSI: ffffffff82348ecc RDI: 0000000000000068
RBP: ffff88805b079100 R08: 0000000000000000 R09: ffffed100ff0e394
R10: ffff88807f871ca3 R11: 0000000000000089 R12: ffff88807f871be8
R13: ffff88807b7d6e60 R14: ffff88807b7d6d38 R15: ffff88807b7d6dd0
FS:  00007f8ee9ff66c0(0000) GS:ffff8880b8700000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055555c2225c8 CR3: 0000000025306000 CR4: 0000000000350ef0
----------------
Code disassembly (best guess):
   0:	48 c1 ea 03          	shr    $0x3,%rdx
   4:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   8:	0f 85 4e 05 00 00    	jne    0x55c
   e:	49 8b 85 70 ff ff ff 	mov    -0x90(%r13),%rax
  15:	48 ba 00 00 00 00 00 	movabs $0xdffffc0000000000,%rdx
  1c:	fc ff df
  1f:	48 8d 78 68          	lea    0x68(%rax),%rdi
  23:	48 89 f9             	mov    %rdi,%rcx
  26:	48 c1 e9 03          	shr    $0x3,%rcx
* 2a:	80 3c 11 00          	cmpb   $0x0,(%rcx,%rdx,1) <-- trapping instruction
  2e:	0f 85 14 05 00 00    	jne    0x548
  34:	48 8b 40 68          	mov    0x68(%rax),%rax
  38:	48 85 c0             	test   %rax,%rax
  3b:	74 31                	je     0x6e
  3d:	48                   	rex.W
  3e:	89                   	.byte 0x89
  3f:	44                   	rex.R