nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based  firewall rule not found. Use the iptables CT target to attach helpers instead.
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] SMP KASAN
CPU: 1 PID: 6622 Comm: syz-executor3 Not tainted 4.18.0-next-20180816+ #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigio_to_task+0x1ad/0x910 fs/fcntl.c:734
Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1
RSP: 0018:ffff880190a66ea8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff880190a67028 RCX: ffffc9000705d000
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880190a67050 R08: ffff880195d982c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801c7bd18c8
R13: 0000000000000000 R14: ffff880190a66f28 R15: 0000000000000000
FS:  00007fd5fa21a700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000025d0e80 CR3: 00000001c8e5a000 CR4: 00000000001406e0
Call Trace:
 send_sigio+0x36f/0x4a0 fs/fcntl.c:794
 dnotify_handle_event+0x213/0x360 fs/notify/dnotify/dnotify.c:111
 send_to_group fs/notify/fsnotify.c:234 [inline]
 fsnotify+0x97d/0x14e0 fs/notify/fsnotify.c:374
 __fsnotify_parent+0x306/0x420 fs/notify/fsnotify.c:172
 fsnotify_parent include/linux/fsnotify.h:26 [inline]
 fsnotify_access include/linux/fsnotify.h:184 [inline]
 do_iter_read+0x1b9/0x650 fs/read_write.c:927
 vfs_readv+0x175/0x1c0 fs/read_write.c:986
 kernel_readv fs/splice.c:362 [inline]
 default_file_splice_read+0x526/0xb10 fs/splice.c:417
 do_splice_to+0x12e/0x190 fs/splice.c:881
 splice_direct_to_actor+0x270/0x8f0 fs/splice.c:953
 do_splice_direct+0x2d4/0x420 fs/splice.c:1062
 do_sendfile+0x62a/0xe20 fs/read_write.c:1440
 __do_sys_sendfile64 fs/read_write.c:1495 [inline]
 __se_sys_sendfile64 fs/read_write.c:1487 [inline]
 __x64_sys_sendfile64+0x15d/0x250 fs/read_write.c:1487
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457089
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 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 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fd5fa219c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000028
RAX: ffffffffffffffda RBX: 00007fd5fa21a6d4 RCX: 0000000000457089
RDX: 00000000200000c0 RSI: 0000000000000006 RDI: 0000000000000005
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000080000002 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d3cb0 R14: 00000000004c8769 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 9283ae2db05e9686 ]---
RIP: 0010:__read_once_size include/linux/compiler.h:188 [inline]
RIP: 0010:sigio_perm fs/fcntl.c:715 [inline]
RIP: 0010:send_sigio_to_task+0x1ad/0x910 fs/fcntl.c:734
Code: 4c 8d b3 00 ff ff ff 48 b8 00 00 00 00 00 fc ff df 49 8d bf 58 06 00 00 4c 89 f2 48 c1 ea 03 c6 04 02 00 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 1a 07 00 00 49 8b 87 58 06 00 00 4c 89 f2 48 c1
RSP: 0018:ffff880190a66ea8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff880190a67028 RCX: ffffc9000705d000
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880190a67050 R08: ffff880195d982c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801c7bd18c8
R13: 0000000000000000 R14: ffff880190a66f28 R15: 0000000000000000
FS:  00007fd5fa21a700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000025d0e80 CR3: 00000001c8e5a000 CR4: 00000000001406e0