gfs2: not a GFS2 filesystem
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: 17756 Comm: syz-executor0 Not tainted 4.18.0-next-20180815+ #40
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:ffff880195486bd8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff880195486d58 RCX: ffffffff81cb31e3
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880195486d80 R08: ffff88018fd6a480 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801c83a0b88
R13: 0000000000000012 R14: ffff880195486c58 R15: 0000000000000000
FS:  00007f8b20d7d700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: ffffffffff600400 CR3: 0000000007e6a000 CR4: 00000000001406e0
Call Trace:
 send_sigio+0x36f/0x4a0 fs/fcntl.c:794
 kill_fasync_rcu fs/fcntl.c:1005 [inline]
 kill_fasync+0x32e/0x640 fs/fcntl.c:1019
 sock_wake_async+0xbb/0x150 net/socket.c:1195
 sk_wake_async include/net/sock.h:2172 [inline]
 unix_release_sock+0xa28/0xdb0 net/unix/af_unix.c:550
 unix_release+0x44/0x90 net/unix/af_unix.c:833
 __sock_release+0xd7/0x250 net/socket.c:580
 sock_close+0x19/0x20 net/socket.c:1140
 __fput+0x376/0x8a0 fs/file_table.c:279
 ____fput+0x15/0x20 fs/file_table.c:312
 task_work_run+0x1e8/0x2a0 kernel/task_work.c:113
 exit_task_work include/linux/task_work.h:22 [inline]
 do_exit+0x1ae4/0x26e0 kernel/exit.c:871
 do_group_exit+0x177/0x440 kernel/exit.c:974
 get_signal+0x851/0x18e0 kernel/signal.c:2513
 do_signal+0x9c/0x21c0 arch/x86/kernel/signal.c:816
 exit_to_usermode_loop+0x2e5/0x380 arch/x86/entry/common.c:162
 prepare_exit_to_usermode arch/x86/entry/common.c:197 [inline]
 syscall_return_slowpath arch/x86/entry/common.c:268 [inline]
 do_syscall_64+0x6be/0x820 arch/x86/entry/common.c:293
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457089
Code: Bad RIP value.
RSP: 002b:00007f8b20d7cc78 EFLAGS: 00000246 ORIG_RAX: 00000000000000c8
RAX: 0000000000000000 RBX: 00007f8b20d7d6d4 RCX: 0000000000457089
RDX: 0000000000000000 RSI: 0000000000000016 RDI: 00000000000004a8
RBP: 00000000009301e0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004d6c20 R14: 00000000004ca0d7 R15: 0000000000000002
Modules linked in:
Dumping ftrace buffer:
   (ftrace buffer empty)
---[ end trace 4822be6f3709d057 ]---
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:ffff880195486bd8 EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff880195486d58 RCX: ffffffff81cb31e3
RDX: 00000000000000cb RSI: ffffffff81cb2bb3 RDI: 0000000000000658
RBP: ffff880195486d80 R08: ffff88018fd6a480 R09: ffffed003b6246d6
R10: ffffed003b6246d6 R11: ffff8801db1236b3 R12: ffff8801c83a0b88
R13: 0000000000000012 R14: ffff880195486c58 R15: 0000000000000000
FS:  00007f8b20d7d700(0000) GS:ffff8801db100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000045705f CR3: 0000000007e6a000 CR4: 00000000001406e0