BUG: kernel NULL pointer dereference, address: 0000000000000002
#PF: supervisor read access in kernel mode
#PF: error_code(0x0000) - not-present page
PGD 0 P4D 0 
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 1 PID: 34 Comm: kworker/u8:2 Not tainted 6.9.0-rc4-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/07/2024
Workqueue: iou_exit io_ring_exit_work
RIP: 0010:__io_remove_buffers+0x23/0x150 io_uring/kbuf.c:191
Code: 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 50 45 31 ed 85 d2 74 7a 49 89 f6 80 7e 20 00 0f 84 83 00 00 00 49 8b 7e 08 <44> 0f b7 6f 0e 41 0f b7 6e 16 66 41 83 7e 12 00 74 48 4d 8d 7e 12
RSP: 0018:ffffc90000127cc0 EFLAGS: 00010202
RAX: ffff8881052f7000 RBX: ffff8881052f7000 RCX: 0000000000000001
RDX: 00000000ffffffff RSI: ffff8881052f7000 RDI: fffffffffffffff4
RBP: 0000000000000005 R08: ffffc90000127cba R09: 0000000000000402
R10: ffff8881052f7000 R11: 0000000000000000 R12: ffff88810dad3198
R13: 0000000000000000 R14: ffff8881052f7000 R15: ffffc90000127d00
FS:  0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000010279c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 io_put_bl io_uring/kbuf.c:228 [inline]
 io_destroy_buffers+0x94/0x160 io_uring/kbuf.c:242
 io_ring_ctx_free+0x1d8/0x3b0 io_uring/io_uring.c:2891
 io_ring_exit_work+0x270/0x2a0 io_uring/io_uring.c:3122
 process_one_work kernel/workqueue.c:3254 [inline]
 process_scheduled_works+0x2a3/0x5b0 kernel/workqueue.c:3335
 worker_thread+0x23e/0x300 kernel/workqueue.c:3416
 kthread+0xea/0x100 kernel/kthread.c:388
 ret_from_fork+0x32/0x40 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Modules linked in:
CR2: 0000000000000002
---[ end trace 0000000000000000 ]---
RIP: 0010:__io_remove_buffers+0x23/0x150 io_uring/kbuf.c:191
Code: 90 90 90 90 90 90 90 55 41 57 41 56 41 55 41 54 53 50 45 31 ed 85 d2 74 7a 49 89 f6 80 7e 20 00 0f 84 83 00 00 00 49 8b 7e 08 <44> 0f b7 6f 0e 41 0f b7 6e 16 66 41 83 7e 12 00 74 48 4d 8d 7e 12
RSP: 0018:ffffc90000127cc0 EFLAGS: 00010202
RAX: ffff8881052f7000 RBX: ffff8881052f7000 RCX: 0000000000000001
RDX: 00000000ffffffff RSI: ffff8881052f7000 RDI: fffffffffffffff4
RBP: 0000000000000005 R08: ffffc90000127cba R09: 0000000000000402
R10: ffff8881052f7000 R11: 0000000000000000 R12: ffff88810dad3198
R13: 0000000000000000 R14: ffff8881052f7000 R15: ffffc90000127d00
FS:  0000000000000000(0000) GS:ffff888237d00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000002 CR3: 000000010279c000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
----------------
Code disassembly (best guess):
   0:	90                   	nop
   1:	90                   	nop
   2:	90                   	nop
   3:	90                   	nop
   4:	90                   	nop
   5:	90                   	nop
   6:	90                   	nop
   7:	55                   	push   %rbp
   8:	41 57                	push   %r15
   a:	41 56                	push   %r14
   c:	41 55                	push   %r13
   e:	41 54                	push   %r12
  10:	53                   	push   %rbx
  11:	50                   	push   %rax
  12:	45 31 ed             	xor    %r13d,%r13d
  15:	85 d2                	test   %edx,%edx
  17:	74 7a                	je     0x93
  19:	49 89 f6             	mov    %rsi,%r14
  1c:	80 7e 20 00          	cmpb   $0x0,0x20(%rsi)
  20:	0f 84 83 00 00 00    	je     0xa9
  26:	49 8b 7e 08          	mov    0x8(%r14),%rdi
* 2a:	44 0f b7 6f 0e       	movzwl 0xe(%rdi),%r13d <-- trapping instruction
  2f:	41 0f b7 6e 16       	movzwl 0x16(%r14),%ebp
  34:	66 41 83 7e 12 00    	cmpw   $0x0,0x12(%r14)
  3a:	74 48                	je     0x84
  3c:	4d 8d 7e 12          	lea    0x12(%r14),%r15