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: 6985 Comm: syz-executor6 Not tainted 4.18.0-next-20180814+ #39
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:ffff8801961bf878 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801961bf9f8 RCX: ffffc9000802d000
RDX: 00000000000000cb RSI: ffffffff81cae4e3 RDI: 0000000000000658
RBP: ffff8801961bfa20 R08: ffff8801b4b324c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801bfc04108
R13: 0000000000000000 R14: ffff8801961bf8f8 R15: 0000000000000000
FS:  00007f669a5ab700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f445f48b000 CR3: 00000001a90c6000 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_access include/linux/fsnotify.h:185 [inline]
 iterate_dir+0x4e3/0x5d0 fs/readdir.c:55
 ksys_getdents64+0x228/0x450 fs/readdir.c:314
 __do_sys_getdents64 fs/readdir.c:333 [inline]
 __se_sys_getdents64 fs/readdir.c:330 [inline]
 __x64_sys_getdents64+0x73/0xb0 fs/readdir.c:330
 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:00007f669a5aac78 EFLAGS: 00000246 ORIG_RAX: 00000000000000d9
RAX: ffffffffffffffda RBX: 00007f669a5ab6d4 RCX: 0000000000457089
RDX: ffffffffffffff04 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 0000000000930140 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cbaa8 R14: 00000000004c34d3 R15: 0000000000000001
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace d058d2463d8b6a10 ]---
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:ffff8801961bf878 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801961bf9f8 RCX: ffffc9000802d000
RDX: 00000000000000cb RSI: ffffffff81cae4e3 RDI: 0000000000000658
RBP: ffff8801961bfa20 R08: ffff8801b4b324c0 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801bfc04108
R13: 0000000000000000 R14: ffff8801961bf8f8 R15: 0000000000000000
FS:  00007f669a5ab700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f445f48b000 CR3: 00000001a90c6000 CR4: 00000000001406e0