lo_rw_aio(loop1) starting write with NULL file (already cleared?)
Oops: general protection fault, probably for non-canonical address 0xdffffc0000000014: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x00000000000000a0-0x00000000000000a7]
CPU: 0 UID: 0 PID: 27993 Comm: kworker/u9:1 Tainted: G             L      syzkaller #0 PREEMPT_{RT,(full)} 
Tainted: [L]=SOFTLOCKUP
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: loop1 loop_workfn
RIP: 0010:lo_rw_aio+0xd1d/0x1170
Code: 34 fc 45 85 f6 0f 84 d2 00 00 00 43 80 7c 25 00 00 74 08 4c 89 ff e8 12 b0 9d fc bb a0 00 00 00 49 03 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 f4 af 9d fc 48 8b 1b 48 83 c3 28
RSP: 0018:ffffc900057cf680 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888112568000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900057cf7f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10242048f3 R12: dffffc0000000000
R13: 1ffff11021162236 R14: 0000000000000001 R15: ffff888108b111b0
FS:  0000000000000000(0000) GS:ffff88818e91f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555588484a68 CR3: 0000000173f7e000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 loop_process_work+0x637/0x11b0
 process_one_work+0x98b/0x1630
 worker_thread+0xb49/0x1140
 kthread+0x388/0x470
 ret_from_fork+0x514/0xb70
 ret_from_fork_asm+0x1a/0x30
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:lo_rw_aio+0xd1d/0x1170
Code: 34 fc 45 85 f6 0f 84 d2 00 00 00 43 80 7c 25 00 00 74 08 4c 89 ff e8 12 b0 9d fc bb a0 00 00 00 49 03 1f 48 89 d8 48 c1 e8 03 <42> 80 3c 20 00 74 08 48 89 df e8 f4 af 9d fc 48 8b 1b 48 83 c3 28
RSP: 0018:ffffc900057cf680 EFLAGS: 00010206
RAX: 0000000000000014 RBX: 00000000000000a0 RCX: ffff888112568000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900057cf7f0 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: ffffed10242048f3 R12: dffffc0000000000
R13: 1ffff11021162236 R14: 0000000000000001 R15: ffff888108b111b0
FS:  0000000000000000(0000) GS:ffff88818e91f000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555588484a68 CR3: 0000000173f7e000 CR4: 00000000000006f0
