syzbot

general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 PID: 287 Comm: syz-executor333 Not tainted 5.10.234-syzkaller-00033-g094fc3778d6b #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
RIP: 0010:d_backing_inode include/linux/dcache.h:558 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1265
Code: 3e ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 37 71 7c ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1a 71 7c ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc90000af6fd0 EFLAGS: 00010206

RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88810d1a0000
RDX: 0000000000000000 RSI: ffffc90000af7440 RDI: ffffc90000af7430
RBP: ffffc90000af6ff8 R08: dffffc0000000000 R09: ffffc90000af7430
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000af7440
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90000af7430
FS:  000055556c02d380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001600 CR3: 000000010cb5e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 vfs_getattr+0x26/0x70 fs/stat.c:129
 ovl_copy_up_one fs/overlayfs/copy_up.c:882 [inline]
 ovl_copy_up_flags+0x5af/0x2700 fs/overlayfs/copy_up.c:964
 ovl_maybe_copy_up+0x15a/0x190 fs/overlayfs/copy_up.c:996
 ovl_open+0xad/0x210 fs/overlayfs/file.c:151
 do_dentry_open+0x7c1/0x10d0 fs/open.c:819
 vfs_open fs/open.c:942 [inline]
 dentry_open+0xb8/0x100 fs/open.c:958
 file_open+0x2a7/0x650 fs/incfs/vfs.c:1478
 do_dentry_open+0x7c1/0x10d0 fs/open.c:819
 vfs_open+0x73/0x80 fs/open.c:942
 do_open fs/namei.c:3391 [inline]
 path_openat+0x2660/0x3000 fs/namei.c:3509
 do_filp_open+0x21c/0x460 fs/namei.c:3536
 do_sys_openat2+0x13f/0x710 fs/open.c:1217
 do_sys_open fs/open.c:1233 [inline]
 __do_sys_creat fs/open.c:1309 [inline]
 __se_sys_creat fs/open.c:1303 [inline]
 __x64_sys_creat+0x11f/0x160 fs/open.c:1303
 do_syscall_64+0x34/0x70 arch/x86/entry/common.c:-1
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7fd1649dc569
Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 00 00 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffc13b312f8 EFLAGS: 00000246 ORIG_RAX: 0000000000000055
RAX: ffffffffffffffda RBX: 0031656c69662f2e RCX: 00007fd1649dc569
RDX: 00007fd1649dc569 RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00002000000000c0 R08: 00007ffc13b314d8 R09: 00007ffc13b314d8
R10: 00007ffc13b314d8 R11: 0000000000000246 R12: 0030656c69662f2e
R13: 00007ffc13b314c8 R14: 0000000000000001 R15: 0000000000000001
Modules linked in:
---[ end trace 765f20f6766f7936 ]---
RIP: 0010:d_backing_inode include/linux/dcache.h:558 [inline]
RIP: 0010:security_inode_getattr+0x47/0x130 security/security.c:1265
Code: 3e ff 49 8d 5f 08 48 89 d8 48 c1 e8 03 42 80 3c 28 00 74 08 48 89 df e8 37 71 7c ff 48 8b 1b 48 83 c3 30 48 89 d8 48 c1 e8 03 <42> 80 3c 28 00 74 08 48 89 df e8 1a 71 7c ff 48 8b 1b 48 83 c3 0c
RSP: 0018:ffffc90000af6fd0 EFLAGS: 00010206
RAX: 0000000000000006 RBX: 0000000000000030 RCX: ffff88810d1a0000
RDX: 0000000000000000 RSI: ffffc90000af7440 RDI: ffffc90000af7430
RBP: ffffc90000af6ff8 R08: dffffc0000000000 R09: ffffc90000af7430
R10: 0000000000000000 R11: dffffc0000000001 R12: ffffc90000af7440
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90000af7430
FS:  000055556c02d380(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000001600 CR3: 000000010cb5e000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	3e ff 49 8d          	ds decl -0x73(%rcx)
   4:	5f                   	pop    %rdi
   5:	08 48 89             	or     %cl,-0x77(%rax)
   8:	d8 48 c1             	fmuls  -0x3f(%rax)
   b:	e8 03 42 80 3c       	call   0x3c804213
  10:	28 00                	sub    %al,(%rax)
  12:	74 08                	je     0x1c
  14:	48 89 df             	mov    %rbx,%rdi
  17:	e8 37 71 7c ff       	call   0xff7c7153
  1c:	48 8b 1b             	mov    (%rbx),%rbx
  1f:	48 83 c3 30          	add    $0x30,%rbx
  23:	48 89 d8             	mov    %rbx,%rax
  26:	48 c1 e8 03          	shr    $0x3,%rax
* 2a:	42 80 3c 28 00       	cmpb   $0x0,(%rax,%r13,1) <-- trapping instruction
  2f:	74 08                	je     0x39
  31:	48 89 df             	mov    %rbx,%rdi
  34:	e8 1a 71 7c ff       	call   0xff7c7153
  39:	48 8b 1b             	mov    (%rbx),%rbx
  3c:	48 83 c3 0c          	add    $0xc,%rbx