BUG: kernel NULL pointer dereference, address: 0000000000000018
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 800000010e705067 P4D 800000010e705067 PUD 10e711067 PMD 0 
Oops: Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 UID: 0 PID: 3050 Comm: syz.3.15 Not tainted 6.12.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/13/2024
RIP: 0010:headpage_already_acct io_uring/rsrc.c:584 [inline]
RIP: 0010:io_buffer_account_pin io_uring/rsrc.c:614 [inline]
RIP: 0010:io_sqe_buffer_register+0x279/0x8f0 io_uring/rsrc.c:758
Code: c0 0f 84 a3 00 00 00 31 ff eb 11 41 8b 86 20 01 00 00 ff c7 39 c7 0f 83 8e 00 00 00 49 8b 96 28 01 00 00 48 63 ef 48 8b 14 ea <48> 8b 5a 18 8b 53 0c 85 d2 74 dd 31 ed eb 09 8b 53 0c ff c5 39 d5
RSP: 0018:ffffc90001c3bc98 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 00000000fffffe00 RCX: ffffea0008d90000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffc90001c3bd48 R11: 0000000000000000 R12: ffff888104faa380
R13: ffff888101fcdb00 R14: ffff888108eb7000 R15: ffff8881057b3fa0
FS:  00007f92705f16c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 0000000104b26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __io_sqe_buffers_update io_uring/rsrc.c:257 [inline]
 __io_register_rsrc_update+0x205/0x4b0 io_uring/rsrc.c:295
 io_register_rsrc_update+0x87/0xb0 io_uring/rsrc.c:326
 __do_sys_io_uring_register io_uring/register.c:938 [inline]
 __se_sys_io_uring_register+0x548/0x13d0 io_uring/register.c:915
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0x8d/0x170 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f926f77e719
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:00007f92705f1038 EFLAGS: 00000246 ORIG_RAX: 00000000000001ab
RAX: ffffffffffffffda RBX: 00007f926f935f80 RCX: 00007f926f77e719
RDX: 0000000020000600 RSI: 0000000000000010 RDI: 0000000000000003
RBP: 00007f926f7f132e R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000020 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f926f935f80 R15: 00007fff382895a8
 </TASK>
Modules linked in:
CR2: 0000000000000018
---[ end trace 0000000000000000 ]---
RIP: 0010:headpage_already_acct io_uring/rsrc.c:584 [inline]
RIP: 0010:io_buffer_account_pin io_uring/rsrc.c:614 [inline]
RIP: 0010:io_sqe_buffer_register+0x279/0x8f0 io_uring/rsrc.c:758
Code: c0 0f 84 a3 00 00 00 31 ff eb 11 41 8b 86 20 01 00 00 ff c7 39 c7 0f 83 8e 00 00 00 49 8b 96 28 01 00 00 48 63 ef 48 8b 14 ea <48> 8b 5a 18 8b 53 0c 85 d2 74 dd 31 ed eb 09 8b 53 0c ff c5 39 d5
RSP: 0018:ffffc90001c3bc98 EFLAGS: 00010246
RAX: 0000000000000002 RBX: 00000000fffffe00 RCX: ffffea0008d90000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000006 R09: 0000000000000000
R10: ffffc90001c3bd48 R11: 0000000000000000 R12: ffff888104faa380
R13: ffff888101fcdb00 R14: ffff888108eb7000 R15: ffff8881057b3fa0
FS:  00007f92705f16c0(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 0000000104b26000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	c0 0f 84             	rorb   $0x84,(%rdi)
   3:	a3 00 00 00 31 ff eb 	movabs %eax,0x4111ebff31000000
   a:	11 41
   c:	8b 86 20 01 00 00    	mov    0x120(%rsi),%eax
  12:	ff c7                	inc    %edi
  14:	39 c7                	cmp    %eax,%edi
  16:	0f 83 8e 00 00 00    	jae    0xaa
  1c:	49 8b 96 28 01 00 00 	mov    0x128(%r14),%rdx
  23:	48 63 ef             	movslq %edi,%rbp
  26:	48 8b 14 ea          	mov    (%rdx,%rbp,8),%rdx
* 2a:	48 8b 5a 18          	mov    0x18(%rdx),%rbx <-- trapping instruction
  2e:	8b 53 0c             	mov    0xc(%rbx),%edx
  31:	85 d2                	test   %edx,%edx
  33:	74 dd                	je     0x12
  35:	31 ed                	xor    %ebp,%ebp
  37:	eb 09                	jmp    0x42
  39:	8b 53 0c             	mov    0xc(%rbx),%edx
  3c:	ff c5                	inc    %ebp
  3e:	39 d5                	cmp    %edx,%ebp