general protection fault, probably for non-canonical address 0xdffffc0000000102: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000810-0x0000000000000817]
CPU: 1 PID: 28049 Comm: syz-executor.5 Not tainted 5.14.0-rc7-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:io_register_iowq_max_workers fs/io_uring.c:10341 [inline]
RIP: 0010:__io_uring_register fs/io_uring.c:10546 [inline]
RIP: 0010:__do_sys_io_uring_register+0xb73/0x2380 fs/io_uring.c:10581
Code: 03 80 3c 02 00 0f 85 8e 16 00 00 48 8b 9b a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 10 08 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 16 00 00 48 8b 9b 10 08 00 00 48 85 db 0f 84
RSP: 0018:ffffc90008c4fdf0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000102 RSI: 0000000000000004 RDI: 0000000000000810
RBP: ffff88801c1b6780 R08: 0000000000000000 R09: ffff888045151c13
R10: ffffed1008a2a382 R11: 0000000000000001 R12: ffff88802c70c000
R13: ffff888045151c08 R14: 1ffff92001189fc9 R15: ffff88802c70c040
FS:  00007f5382a2f700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000044 CR3: 0000000013f90000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x4665f9
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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f5382a2f188 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 000000000056c038 RCX: 00000000004665f9
RDX: 0000000020004000 RSI: 0000000000000013 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000002 R11: 0000000000000246 R12: 000000000056c038
R13: 00007ffff62140af R14: 00007f5382a2f300 R15: 0000000000022000
Modules linked in:
---[ end trace c0f0b844abd92675 ]---
RIP: 0010:io_register_iowq_max_workers fs/io_uring.c:10341 [inline]
RIP: 0010:__io_uring_register fs/io_uring.c:10546 [inline]
RIP: 0010:__do_sys_io_uring_register+0xb73/0x2380 fs/io_uring.c:10581
Code: 03 80 3c 02 00 0f 85 8e 16 00 00 48 8b 9b a8 00 00 00 48 b8 00 00 00 00 00 fc ff df 48 8d bb 10 08 00 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 5b 16 00 00 48 8b 9b 10 08 00 00 48 85 db 0f 84
RSP: 0018:ffffc90008c4fdf0 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000102 RSI: 0000000000000004 RDI: 0000000000000810
RBP: ffff88801c1b6780 R08: 0000000000000000 R09: ffff888045151c13
R10: ffffed1008a2a382 R11: 0000000000000001 R12: ffff88802c70c000
R13: ffff888045151c08 R14: 1ffff92001189fc9 R15: ffff88802c70c040
FS:  00007f5382a2f700(0000) GS:ffff8880b9f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fffcb5e8720 CR3: 0000000013f90000 CR4: 00000000001506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	03 80 3c 02 00 0f    	add    0xf00023c(%rax),%eax
   6:	85 8e 16 00 00 48    	test   %ecx,0x48000016(%rsi)
   c:	8b 9b a8 00 00 00    	mov    0xa8(%rbx),%ebx
  12:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  19:	fc ff df
  1c:	48 8d bb 10 08 00 00 	lea    0x810(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 5b 16 00 00    	jne    0x168f
  34:	48 8b 9b 10 08 00 00 	mov    0x810(%rbx),%rbx
  3b:	48 85 db             	test   %rbx,%rbx
  3e:	0f                   	.byte 0xf
  3f:	84                   	.byte 0x84