BUG: kernel NULL pointer dereference, address: 0000000000000000
#PF: supervisor instruction fetch in kernel mode
#PF: error_code(0x0010) - not-present page
PGD acbc9067 P4D acbc9067 PUD 7e2d8067 PMD 0 
Oops: 0010 [#1] PREEMPT SMP KASAN
CPU: 0 PID: 31323 Comm: syz-executor.4 Not tainted 5.14.0-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900184273f0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffffffffffe3 RCX: 0000000000040000
RDX: 0000000000000000 RSI: ffffffffffffffe3 RDI: ffff88802ee35c80
RBP: 0000000000000000 R08: 0000000000000007 R09: ffffffff81ef821d
R10: 0000000000000005 R11: ffff8880a5673900 R12: ffff88802ee35c90
R13: ffff88802ee35c80 R14: ffffffffffffffe3 R15: dffffc0000000000
FS:  00007f581737f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000018120000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 io_rw_done fs/io_uring.c:2905 [inline]
 kiocb_done+0x363/0x920 fs/io_uring.c:2929
 io_read fs/io_uring.c:3503 [inline]
 io_issue_sqe+0x4c8f/0x9280 fs/io_uring.c:6558
 __io_queue_sqe+0xe3/0x1000 fs/io_uring.c:6864
 tctx_task_work+0x2ad/0x560 fs/io_uring.c:2143
 task_work_run+0x146/0x1c0 kernel/task_work.c:164
 tracehook_notify_signal include/linux/tracehook.h:212 [inline]
 handle_signal_work kernel/entry/common.c:146 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x180/0x220 kernel/entry/common.c:209
 __syscall_exit_to_user_mode_work kernel/entry/common.c:291 [inline]
 syscall_exit_to_user_mode+0x26/0x60 kernel/entry/common.c:302
 do_syscall_64+0x4c/0xb0 arch/x86/entry/common.c:86
 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:00007f581737f188 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: 0000000000000100 RBX: 000000000056bf80 RCX: 00000000004665f9
RDX: 0000000000000000 RSI: 0000000000004510 RDI: 0000000000000003
RBP: 00000000004bfcc4 R08: 0000000000000000 R09: 00000000f0ffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 000000000056bf80
R13: 00007ffcc1a5c67f R14: 00007f581737f300 R15: 0000000000022000
Modules linked in:
CR2: 0000000000000000
---[ end trace b88a1445eb969838 ]---
RIP: 0010:0x0
Code: Unable to access opcode bytes at RIP 0xffffffffffffffd6.
RSP: 0018:ffffc900184273f0 EFLAGS: 00010246
RAX: dffffc0000000000 RBX: ffffffffffffffe3 RCX: 0000000000040000
RDX: 0000000000000000 RSI: ffffffffffffffe3 RDI: ffff88802ee35c80
RBP: 0000000000000000 R08: 0000000000000007 R09: ffffffff81ef821d
R10: 0000000000000005 R11: ffff8880a5673900 R12: ffff88802ee35c90
R13: ffff88802ee35c80 R14: ffffffffffffffe3 R15: dffffc0000000000
FS:  00007f581737f700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 0000000018120000 CR4: 00000000001526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400