executing program
syzkaller login: [   17.507076] netlink: 13 bytes leftover after parsing attributes in process `syzkaller048598'.
[   17.508135] kasan: CONFIG_KASAN_INLINE enabled
[   17.508631] kasan: GPF could be caused by NULL-ptr deref or user memory access
[   17.509581] general protection fault: 0000 [#1] SMP KASAN
[   17.509982] Dumping ftrace buffer:
[   17.510237]    (ftrace buffer empty)
[   17.510493] Modules linked in:
[   17.510710] CPU: 1 PID: 2926 Comm: syzkaller048598 Not tainted 4.13.0-rc4-next-20170811 #1
[   17.511273] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011
[   17.511893] task: ffff88006c752940 task.stack: ffff880068bc0000
[   17.512511] RIP: 0010:fib_dump_info+0x3aa/0x1470
[   17.512946] RSP: 0018:ffff880068bc6c08 EFLAGS: 00010206
[   17.513313] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
[   17.513792] RDX: 0000000000000006 RSI: 0000000000000002 RDI: 0000000000000030
[   17.514312] RBP: ffff880068bc6e60 R08: ffffed0007c78d81 R09: ffffed0007c78d81
[   17.515020] R10: 0000000000000001 R11: ffffed0007c78d80 R12: ffff88003e3c6bf5
[   17.515720] R13: 0000000000000000 R14: ffff88003e3c6be4 R15: ffff88003d4b76c0
[   17.516211] FS:  00000000024ac880(0000) GS:ffff88003fd00000(0000) knlGS:0000000000000000
[   17.516769] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   17.517199] CR2: 0000000020b9fff0 CR3: 000000003a032000 CR4: 00000000000006e0
[   17.518014] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   17.518763] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   17.519539] Call Trace:
[   17.519770]  ? ip_route_input_noref+0x1e0/0x1e0
[   17.520172]  ? kmem_cache_alloc_node_trace+0x323/0x710
[   17.520651]  ? fib_create_info+0x3870/0x3870
[   17.521032]  ? __kmalloc_node_track_caller+0x47/0x70
[   17.521503]  ? memset+0x31/0x40
[   17.521794]  ? __alloc_skb+0x548/0x740
[   17.522155]  ? lock_acquire+0x1d5/0x580
[   17.522483]  ? lock_acquire+0x1d5/0x580
[   17.522750]  ? inet_rtm_getroute+0xaa0/0x2d40
[   17.523051]  ? lock_release+0xa40/0xa40
[   17.523326]  ? nla_parse+0x29a/0x3d0
[   17.523578]  inet_rtm_getroute+0xfb7/0x2d40
[   17.523867]  ? rtnetlink_rcv_msg+0x65c/0x1090
[   17.524214]  ? ipv4_sk_update_pmtu+0xa90/0xa90
[   17.524542]  ? __might_sleep+0x95/0x190
[   17.524809]  ? rtnetlink_rcv_msg+0x65c/0x1090
[   17.525108]  ? __mutex_lock+0x16f/0x1870
[   17.525386]  ? rtnetlink_rcv_msg+0x65c/0x1090
[   17.525685]  ? rtnetlink_rcv_msg+0x65c/0x1090
[   17.525986]  ? mutex_lock_io_nested+0x1740/0x1740
[   17.526374]  ? __lock_acquire+0x6aa/0x3bc0
[   17.526658]  ? check_noncircular+0x20/0x20
[   17.526945]  ? __lock_acquire+0x6aa/0x3bc0
[   17.527227]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   17.527585]  ? check_noncircular+0x20/0x20
[   17.528330]  ? debug_check_no_locks_freed+0x3c0/0x3c0
[   17.528689]  ? __lock_acquire+0x6aa/0x3bc0
[   17.528974]  ? check_noncircular+0x20/0x20
[   17.529279]  ? ipv4_sk_update_pmtu+0xa90/0xa90
[   17.529597]  rtnetlink_rcv_msg+0x733/0x1090
[   17.529888]  ? rtnl_calcit.isra.23+0x4f0/0x4f0
[   17.530203]  ? trace_hardirqs_on+0xd/0x10
[   17.530497]  ? check_noncircular+0x20/0x20
[   17.530781]  ? find_held_lock+0x35/0x1d0
[   17.531054]  ? netlink_lookup+0x5f7/0xa90
[   17.531341]  ? find_held_lock+0x35/0x1d0
[   17.531624]  ? ipv4_sk_update_pmtu+0xa90/0xa90
[   17.531933]  ? lock_downgrade+0x990/0x990
[   17.532209]  ? lock_release+0xa40/0xa40
[   17.532493]  ? netlink_lookup+0x620/0xa90
[   17.532770]  ? ipv4_sk_update_pmtu+0xa90/0xa90
[   17.533076]  ? netlink_connect+0x4e0/0x4e0
[   17.533366]  ? netlink_deliver_tap+0x176/0xa60
[   17.533681]  ? iov_iter_advance+0x2a1/0x13f0
[   17.533976]  ? sock_has_perm+0x29c/0x400
[   17.534262]  netlink_rcv_skb+0x216/0x440
[   17.534544]  ? rtnl_calcit.isra.23+0x4f0/0x4f0
[   17.534850]  ? netlink_ack+0xab0/0xab0
[   17.535111]  ? netlink_skb_destructor+0x1d0/0x1d0
[   17.535448]  ? selinux_nlmsg_lookup+0x32b/0x430
[   17.535768]  rtnetlink_rcv+0x1c/0x20
[   17.536016]  netlink_unicast+0x4e8/0x6f0
[   17.536300]  ? netlink_attachskb+0x8a0/0x8a0
[   17.536605]  ? security_netlink_send+0x81/0xb0
[   17.536910]  netlink_sendmsg+0xa4a/0xe60
[   17.537217]  ? netlink_unicast+0x6f0/0x6f0
[   17.537522]  ? security_socket_sendmsg+0x89/0xb0
[   17.537842]  ? netlink_unicast+0x6f0/0x6f0
[   17.538167]  sock_sendmsg+0xca/0x110
[   17.538450]  sock_write_iter+0x31a/0x5d0
[   17.538735]  ? sock_sendmsg+0x110/0x110
[   17.539004]  ? selinux_capset+0x100/0x100
[   17.539292]  ? ___might_sleep+0x45c/0x470
[   17.539582]  do_iter_readv_writev+0x525/0x7f0
[   17.539883]  ? vfs_dedupe_file_range+0x900/0x900
[   17.540201]  ? rw_verify_area+0xe5/0x2b0
[   17.540487]  do_iter_write+0x154/0x540
[   17.540759]  ? dup_iter+0x260/0x260
[   17.541006]  ? __do_page_fault+0x51b/0xb60
[   17.541303]  vfs_writev+0x18a/0x340
[   17.541554]  ? __fget_light+0x297/0x380
[   17.541818]  ? vfs_iter_write+0xb0/0xb0
[   17.542085]  ? downgrade_write+0x150/0x150
[   17.542383]  ? vmacache_find+0x61/0x270
[   17.542658]  ? up_read+0x1a/0x40
[   17.542883]  ? __do_page_fault+0x35b/0xb60
[   17.543169]  ? __fdget_pos+0x130/0x190
[   17.543438]  ? __fdget_raw+0x20/0x20
[   17.543695]  ? do_page_fault+0x70/0x70
[   17.543958]  do_writev+0xfc/0x2a0
[   17.544188]  ? do_writev+0xfc/0x2a0
[   17.544443]  ? vfs_writev+0x340/0x340
[   17.544704]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   17.545027]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   17.545374]  SyS_writev+0x27/0x30
[   17.545614]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   17.545931] RIP: 0033:0x434ec9
[   17.546144] RSP: 002b:00007ffe62164548 EFLAGS: 00000203 ORIG_RAX: 0000000000000014
[   17.546675] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000434ec9
[   17.547150] RDX: 0000000000000001 RSI: 0000000020b9fff0 RDI: 0000000000000003
[   17.547646] RBP: 0000000000000086 R08: 0000000000000000 R09: 0000000000000000
[   17.548123] R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000000000
[   17.548620] R13: 0000000000401840 R14: 00000000004018d0 R15: 0000000000000000
[   17.549125] Code: 0f b6 b5 e4 fd ff ff 48 8b 85 f0 fd ff ff 40 88 70 17 48 8b 45 28 48 8d 78 30 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8d 0e 00 00 48 8b 45 28 44 
[   17.551168] RIP: fib_dump_info+0x3aa/0x1470 RSP: ffff880068bc6c08
[   17.551732] ---[ end trace 3df3427e9b9d91b4 ]---
[   17.552070] Kernel panic - not syncing: Fatal exception
[   17.553471] Dumping ftrace buffer:
[   17.553794]    (ftrace buffer empty)
[   17.554112] Kernel Offset: disabled
[   17.554515] Rebooting in 86400 seconds..