------------[ cut here ]------------
WARNING: CPU: 0 PID: 8479 at net/core/sock_reuseport.c:41 reuseport_alloc+0x223/0x290 net/core/sock_reuseport.c:39
multiple allocations for the same socket
Kernel panic - not syncing: panic_on_warn set ...

 [<ffffffff814d16c1>] do_anonymous_page mm/memory.c:2747 [inline]
 [<ffffffff814d16c1>] handle_pte_fault mm/memory.c:3488 [inline]
 [<ffffffff814d16c1>] __handle_mm_fault mm/memory.c:3577 [inline]
 [<ffffffff814d16c1>] handle_mm_fault+0x1fd1/0x2530 mm/memory.c:3614
 [<ffffffff810e1447>] __do_page_fault+0x5b7/0xd70 arch/x86/mm/fault.c:1396
 [<ffffffff810e1c27>] do_page_fault+0x27/0x30 arch/x86/mm/fault.c:1460
 [<ffffffff838b0658>] page_fault+0x28/0x30 arch/x86/entry/entry_64.S:1012
 [<ffffffff838af485>] entry_SYSCALL_64_fastpath+0x23/0xc6
CPU: 0 PID: 8479 Comm: syz-executor5 Not tainted 4.9.62-gf09daf1 #91
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801aa77fa88 ffffffff81d94429 ffffffff83a46ce0 ffff8801aa77fb60
 ffffffff83ee9300 ffffffff82f98573 0000000000000009 ffff8801aa77fb50
 ffffffff814304e1 0000000041b58ab3 ffffffff84186b40 ffffffff81430325
Call Trace:
 [<ffffffff81d94429>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81d94429>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff814304e1>] panic+0x1bc/0x3a8 kernel/panic.c:179
 [<ffffffff81133404>] __warn+0x1c4/0x1e0 kernel/panic.c:542
 [<ffffffff811334e4>] warn_slowpath_fmt+0xc4/0x110 kernel/panic.c:565
 [<ffffffff82f98573>] reuseport_alloc+0x223/0x290 net/core/sock_reuseport.c:39
 [<ffffffff82f90b11>] __reuseport_attach_prog net/core/filter.c:1212 [inline]
 [<ffffffff82f90b11>] sk_reuseport_attach_filter+0x1c1/0x2a0 net/core/filter.c:1300
 [<ffffffff82ee70b7>] sock_setsockopt+0x5f7/0x18e0 net/core/sock.c:912
 [<ffffffff82ed62d6>] SYSC_setsockopt net/socket.c:1767 [inline]
 [<ffffffff82ed62d6>] SyS_setsockopt+0x216/0x250 net/socket.c:1750
 [<ffffffff838af485>] entry_SYSCALL_64_fastpath+0x23/0xc6
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled
Rebooting in 86400 seconds..