__should_failslab+0x124/0x180 mm/failslab.c:32
 should_failslab+0x9/0x14 mm/slab_common.c:1522
 slab_pre_alloc_hook mm/slab.h:423 [inline]
 slab_alloc mm/slab.c:3378 [inline]
 kmem_cache_alloc+0x2af/0x760 mm/slab.c:3552
 kmem_cache_zalloc include/linux/slab.h:696 [inline]
 get_empty_filp+0x125/0x520 fs/file_table.c:122
BUG: unable to handle kernel NULL pointer dereference
 at 0000000000000000
PGD 1d684f067 
P4D 1d684f067 
PUD 18c002067 
PMD 0 
 alloc_file+0x24/0x3e0 fs/file_table.c:163
 aio_private_file fs/aio.c:237 [inline]
 aio_setup_ring fs/aio.c:479 [inline]
 ioctx_alloc+0x868/0x2480 fs/aio.c:760
Oops: 0010 [#1] SMP KASAN
CPU: 0 PID: 12427 Comm: syz-executor4 Not tainted 4.17.0+ #116
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:          (null)
Code: 
Bad RIP value.
RSP: 0018:ffff88018f68f470 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801bc67f800 RCX: 1ffffffff10ea8e5
RDX: ffff88018f68f990 RSI: ffff8801b3309040 RDI: ffff88018be58ac0
RBP: ffff88018f68f5e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10031ed1e93
R13: ffff88018f68f990 R14: ffff8801bc67f812 R15: ffff8801bc67fc58
FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5faeb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001a99e1000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
 __do_compat_sys_io_setup fs/aio.c:1341 [inline]
 __se_compat_sys_io_setup fs/aio.c:1324 [inline]
 __ia32_compat_sys_io_setup+0x109/0x4a0 fs/aio.c:1324
Call Trace:
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
 sock_poll+0x1d1/0x710 net/socket.c:1156
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
 vfs_poll+0x77/0x2a0 fs/select.c:40
 do_pollfd fs/select.c:848 [inline]
 do_poll fs/select.c:896 [inline]
 do_sys_poll+0x6fd/0x1100 fs/select.c:990
RIP: 0023:0xf7f37cb9
Code: 
55 
08 
8b 
88 
64 
cd 
ff 
ff 
8b 
98 
68 
cd 
ff 
ff 
89 
c8 
85 
d2 
74 
02 
89 
0a 
5b 
5d 
c3 
 __do_compat_sys_ppoll fs/select.c:1425 [inline]
 __se_compat_sys_ppoll fs/select.c:1398 [inline]
 __ia32_compat_sys_ppoll+0x2f3/0x5f0 fs/select.c:1398
8b 
04 
24 
c3 
8b 
1c 
 do_syscall_32_irqs_on arch/x86/entry/common.c:323 [inline]
 do_fast_syscall_32+0x345/0xf9b arch/x86/entry/common.c:394
24 
c3 
51 
52 
55 
89 
e5 
0f 
 entry_SYSENTER_compat+0x70/0x7f arch/x86/entry/entry_64_compat.S:139
34 cd 80 <5d> 5a 59 
RIP: 0023:0xf7fb2cb9
c3 
Code: 
90 
55 
90 
08 
90 
8b 
90 
88 
eb 
64 
0d 
cd 
90 
ff ff 
90 
8b 
90 
98 
90 
68 cd 
90 90 
ff 
90 
ff 
90 
89 
90 
c8 
90 
85 
90 
d2 
90 
RSP: 002b:00000000f5f330ac EFLAGS: 00000282
74 
 ORIG_RAX: 00000000000000f5
02 
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000020cadffc
89 
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
0a 
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
5b 
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
5d 
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
c3 8b 04 24 c3 8b 1c 24 c3 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 eb 0d 90 90 90 90 90 90 90 90 90 90 90 90 
RSP: 002b:00000000f5fae0ac EFLAGS: 00000282 ORIG_RAX: 0000000000000135
RAX: ffffffffffffffda RBX: 0000000020003c80 RCX: 0000000000000003
RDX: 0000000020005780 RSI: 00000000200057c0 RDI: 0000000000000008
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000296 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
CR2: 0000000000000000
---[ end trace 72895e9e00cc8241 ]---
RIP: 0010:          (null)
Code: Bad RIP value.
RSP: 0018:ffff88018f68f470 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801bc67f800 RCX: 1ffffffff10ea8e5
RDX: ffff88018f68f990 RSI: ffff8801b3309040 RDI: ffff88018be58ac0
RBP: ffff88018f68f5e0 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: 1ffff10031ed1e93
R13: ffff88018f68f990 R14: ffff8801bc67f812 R15: ffff8801bc67fc58
FS:  0000000000000000(0000) GS:ffff8801dae00000(0063) knlGS:00000000f5faeb40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: ffffffffffffffd6 CR3: 00000001a99e1000 CR4: 00000000001406f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600