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syzkaller login: [   23.113464] multiple allocations for the same socket
[   23.113578] ------------[ cut here ]------------
[   23.114310] WARNING: CPU: 2 PID: 3498 at net/core/sock_reuseport.c:41 reuseport_alloc+0x306/0x3b0
[   23.115039] Kernel panic - not syncing: panic_on_warn set ...
[   23.115039] 
[   23.115715] CPU: 2 PID: 3498 Comm: syzkaller703992 Not tainted 4.14.0-rc5-next-20171018+ #8
[   23.116483] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   23.117230] Call Trace:
[   23.117481]  dump_stack+0x194/0x257
[   23.117909]  ? arch_local_irq_restore+0x53/0x53
[   23.118331]  ? vsnprintf+0x1ed/0x1900
[   23.118684]  panic+0x1e4/0x41c
[   23.118982]  ? refcount_error_report+0x214/0x214
[   23.119397]  ? show_regs_print_info+0x65/0x65
[   23.119789]  ? retint_kernel+0x10/0x10
[   23.120144]  ? __warn+0x1a9/0x1e0
[   23.120448]  ? reuseport_alloc+0x306/0x3b0
[   23.120829]  __warn+0x1c4/0x1e0
[   23.121138]  ? reuseport_alloc+0x306/0x3b0
[   23.121518]  report_bug+0x211/0x2d0
[   23.121882]  fixup_bug+0x40/0x90
[   23.122206]  do_trap+0x260/0x390
[   23.122540]  do_error_trap+0x120/0x390
[   23.122917]  ? do_trap+0x390/0x390
[   23.123262]  ? reuseport_alloc+0x306/0x3b0
[   23.123672]  ? vprintk_emit+0x3ea/0x590
[   23.124070]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   23.124543]  do_invalid_op+0x1b/0x20
[   23.124905]  invalid_op+0x18/0x20
[   23.125280] RIP: 0010:reuseport_alloc+0x306/0x3b0
[   23.125734] RSP: 0018:ffff88006961fa40 EFLAGS: 00010282
[   23.126330] RAX: 0000000000000028 RBX: ffff88003adc3500 RCX: 0000000000000000
[   23.127013] RDX: 0000000000000028 RSI: 1ffff1000d2c3f08 RDI: ffffed000d2c3f3c
[   23.127698] RBP: ffff88006961fb10 R08: 0000000000000001 R09: 0000000000000000
[   23.128380] R10: ffff88006961f8f8 R11: 0000000000000000 R12: 1ffff1000d2c3f49
[   23.129062] R13: ffff88003adc3500 R14: ffff88006961fae8 R15: ffff88003adc3938
[   23.129800]  ? reuseport_select_sock+0xb60/0xb60
[   23.130243]  ? xdp_do_generic_redirect+0x1110/0x1110
[   23.130705]  __reuseport_attach_prog+0x208/0x280
[   23.131007]  ? bpf_prog_destroy+0x20/0x20
[   23.131303]  ? bpf_prog_store_orig_filter.isra.43+0x147/0x1f0
[   23.131735]  ? _copy_from_user+0x99/0x110
[   23.132371]  ? __get_filter+0xb7/0x220
[   23.132635]  sk_reuseport_attach_filter+0x38/0x80
[   23.132989]  sock_setsockopt+0x164d/0x1ad0
[   23.133313]  ? sock_enable_timestamp+0xb0/0xb0
[   23.133748]  ? handle_mm_fault+0x410/0x8d0
[   23.134149]  ? down_read_trylock+0xdb/0x170
[   23.134559]  ? __do_page_fault+0x31e/0xd60
[   23.134966]  ? vmacache_find+0x5f/0x280
[   23.135358]  ? sock_has_perm+0x29c/0x400
[   23.135755]  ? __fget_light+0x297/0x380
[   23.136126]  ? selinux_secmark_relabel_packet+0xc0/0xc0
[   23.136624]  ? selinux_netlbl_socket_setsockopt+0x10c/0x460
[   23.137202]  ? selinux_netlbl_sock_rcv_skb+0x730/0x730
[   23.137725]  ? do_raw_spin_trylock+0x190/0x190
[   23.138196]  ? selinux_socket_setsockopt+0x64/0x80
[   23.138718]  ? security_socket_setsockopt+0x89/0xb0
[   23.139225]  SyS_setsockopt+0x2ff/0x360
[   23.139621]  ? SyS_recv+0x40/0x40
[   23.139950]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   23.140401]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   23.140884]  ? trace_hardirqs_on_thunk+0x1a/0x1c
[   23.141347]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   23.142178] RIP: 0033:0x43b0b9
[   23.142483] RSP: 002b:00007eff528fedb8 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
[   23.143192] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000043b0b9
[   23.143870] RDX: 0000000000000033 RSI: 0000000000000001 RDI: 000000000000007f
[   23.144547] RBP: 0000000000000082 R08: 0000000000000010 R09: 0000000000000000
[   23.145222] R10: 0000000020e9bff0 R11: 0000000000000246 R12: 0000000000000000
[   23.145966] R13: 0000000000000000 R14: 00007eff528ff9c0 R15: 00007eff528ff700
[   23.146906] Dumping ftrace buffer:
[   23.147318]    (ftrace buffer empty)
[   23.147731] Kernel Offset: disabled
[   23.148115] Rebooting in 86400 seconds..