general protection fault, probably for non-canonical address 0xdffffc000000000b: 0000 [#1] PREEMPT SMP KASAN
KASAN: null-ptr-deref in range [0x0000000000000058-0x000000000000005f]
CPU: 0 PID: 16621 Comm: io_uring-sq Not tainted 5.10.0-rc1-next-20201102-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:fcheck_files include/linux/fdtable.h:99 [inline]
RIP: 0010:__fget_files+0xef/0x400 fs/file.c:829
Code: db 74 1d e8 43 0d ac ff 0f b6 1d c1 82 14 0b 31 ff 89 de e8 43 05 ac ff 84 db 0f 84 d0 01 00 00 e8 26 0d ac ff 48 8b 44 24 10 <80> 38 00 0f 85 c3 02 00 00 48 8b 44 24 08 48 8b 68 58 48 89 e8 48
RSP: 0018:ffffc90007edfb28 EFLAGS: 00010293
RAX: dffffc000000000b RBX: 0000000000000001 RCX: ffffffff81c4157a
RDX: ffff8880135db500 RSI: ffffffff81c4139a RDI: 0000000000000005
RBP: ffffc90007edfd20 R08: 0000000000000001 R09: ffffffff8ebb4667
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000003 R15: ffffc90007edfd30
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000016a5374 CR3: 0000000057aff000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 __io_file_get fs/io_uring.c:2770 [inline]
 io_file_get+0x454/0x8b0 fs/io_uring.c:6295
 io_req_set_file fs/io_uring.c:6304 [inline]
 io_init_req fs/io_uring.c:6724 [inline]
 io_submit_sqes+0xf1c/0x25f0 fs/io_uring.c:6774
 __io_sq_thread fs/io_uring.c:6921 [inline]
 io_sq_thread+0x4d2/0x1700 fs/io_uring.c:6990
 kthread+0x3af/0x4a0 kernel/kthread.c:292
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:296
Modules linked in:
---[ end trace 4b27b1e3658457a9 ]---
RIP: 0010:fcheck_files include/linux/fdtable.h:99 [inline]
RIP: 0010:__fget_files+0xef/0x400 fs/file.c:829
Code: db 74 1d e8 43 0d ac ff 0f b6 1d c1 82 14 0b 31 ff 89 de e8 43 05 ac ff 84 db 0f 84 d0 01 00 00 e8 26 0d ac ff 48 8b 44 24 10 <80> 38 00 0f 85 c3 02 00 00 48 8b 44 24 08 48 8b 68 58 48 89 e8 48
RSP: 0018:ffffc90007edfb28 EFLAGS: 00010293
RAX: dffffc000000000b RBX: 0000000000000001 RCX: ffffffff81c4157a
RDX: ffff8880135db500 RSI: ffffffff81c4139a RDI: 0000000000000005
RBP: ffffc90007edfd20 R08: 0000000000000001 R09: ffffffff8ebb4667
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
R13: dffffc0000000000 R14: 0000000000000003 R15: ffffc90007edfd30
FS:  0000000000000000(0000) GS:ffff8880b9e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000001590000 CR3: 000000001d2d5000 CR4: 00000000001506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600