syzbot

Oops: general protection fault, probably for non-canonical address 0xdffffc0000000006: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000030-0x0000000000000037]
CPU: 0 UID: 0 PID: 11449 Comm: syz.1.1198 Tainted: G             L      syzkaller #0 PREEMPT(full) 
Tainted: [L]=SOFTLOCKUP
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026
RIP: 0010:do_dentry_open+0xaf/0x14e0 fs/open.c:896
Code: 44 24 28 80 3c 28 00 74 08 4c 89 ff e8 5a 60 ef ff 4c 89 7c 24 20 4d 89 27 4d 8d 7c 24 30 4c 89 f8 48 c1 e8 03 48 89 44 24 58 <80> 3c 28 00 74 08 4c 89 ff e8 43 5f ef ff 4c 89 7c 24 60 4d 8b 3f
RSP: 0018:ffffc90005ef7598 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff888057b4b560 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: dffffc0000000000 R08: ffff8880799ac813 R09: 1ffff1100f335902
R10: dffffc0000000000 R11: ffffed100f335903 R12: 0000000000000000
R13: 1ffff1100af696bd R14: ffff888057b4b5e8 R15: 0000000000000030
FS:  00007fe9a14226c0(0000) GS:ffff888125448000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000110c43baae CR3: 0000000076872000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 vfs_open+0x3b/0x340 fs/open.c:1081
 backing_file_open_user_path+0x24/0x60 fs/file_table.c:73
 backing_tmpfile_open+0x9b/0x110 fs/backing-file.c:72
 ovl_create_tmpfile fs/overlayfs/dir.c:1392 [inline]
 ovl_tmpfile+0x400/0x810 fs/overlayfs/dir.c:1449
 vfs_tmpfile+0x3ff/0x890 fs/namei.c:4744
 do_tmpfile+0xd3/0x240 fs/namei.c:4809
 path_openat+0x300d/0x3860 fs/namei.c:4843
 do_file_open+0x23e/0x4a0 fs/namei.c:4881
 do_sys_openat2+0x113/0x200 fs/open.c:1366
 __do_sys_openat2 fs/open.c:1415 [inline]
 __se_sys_openat2+0x223/0x2d0 fs/open.c:1391
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x14d/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fe9a059c799
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fe9a1422028 EFLAGS: 00000246 ORIG_RAX: 00000000000001b5
RAX: ffffffffffffffda RBX: 00007fe9a0815fa0 RCX: 00007fe9a059c799
RDX: 0000200000000140 RSI: 0000200000000000 RDI: ffffffffffffff9c
RBP: 00007fe9a0632c99 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000018 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fe9a0816038 R14: 00007fe9a0815fa0 R15: 00007ffca4f90678
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:do_dentry_open+0xaf/0x14e0 fs/open.c:896
Code: 44 24 28 80 3c 28 00 74 08 4c 89 ff e8 5a 60 ef ff 4c 89 7c 24 20 4d 89 27 4d 8d 7c 24 30 4c 89 f8 48 c1 e8 03 48 89 44 24 58 <80> 3c 28 00 74 08 4c 89 ff e8 43 5f ef ff 4c 89 7c 24 60 4d 8b 3f
RSP: 0018:ffffc90005ef7598 EFLAGS: 00010206
RAX: 0000000000000006 RBX: ffff888057b4b560 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000004 RDI: 00000000ffffffff
RBP: dffffc0000000000 R08: ffff8880799ac813 R09: 1ffff1100f335902
R10: dffffc0000000000 R11: ffffed100f335903 R12: 0000000000000000
R13: 1ffff1100af696bd R14: ffff888057b4b5e8 R15: 0000000000000030
FS:  00007fe9a14226c0(0000) GS:ffff888125548000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f146c1e92f8 CR3: 0000000076872000 CR4: 00000000003526f0
----------------
Code disassembly (best guess):
   0:	44 24 28             	rex.R and $0x28,%al
   3:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1)
   7:	74 08                	je     0x11
   9:	4c 89 ff             	mov    %r15,%rdi
   c:	e8 5a 60 ef ff       	call   0xffef606b
  11:	4c 89 7c 24 20       	mov    %r15,0x20(%rsp)
  16:	4d 89 27             	mov    %r12,(%r15)
  19:	4d 8d 7c 24 30       	lea    0x30(%r12),%r15
  1e:	4c 89 f8             	mov    %r15,%rax
  21:	48 c1 e8 03          	shr    $0x3,%rax
  25:	48 89 44 24 58       	mov    %rax,0x58(%rsp)
* 2a:	80 3c 28 00          	cmpb   $0x0,(%rax,%rbp,1) <-- trapping instruction
  2e:	74 08                	je     0x38
  30:	4c 89 ff             	mov    %r15,%rdi
  33:	e8 43 5f ef ff       	call   0xffef5f7b
  38:	4c 89 7c 24 60       	mov    %r15,0x60(%rsp)
  3d:	4d 8b 3f             	mov    (%r15),%r15