executing program syzkaller login: [ 22.129552] netlink: 13 bytes leftover after parsing attributes in process `syzkaller412266'. [ 22.130678] kasan: CONFIG_KASAN_INLINE enabled [ 22.131228] kasan: GPF could be caused by NULL-ptr deref or user memory access [ 22.132174] general protection fault: 0000 [#1] SMP KASAN [ 22.133148] Dumping ftrace buffer: [ 22.133674] (ftrace buffer empty) [ 22.133988] Modules linked in: [ 22.134290] CPU: 2 PID: 3030 Comm: syzkaller412266 Not tainted 4.13.0-rc5-next-20170817+ #5 [ 22.135759] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Bochs 01/01/2011 [ 22.136526] task: ffff88003d4aa7c0 task.stack: ffff88003cae0000 [ 22.137131] RIP: 0010:fib_dump_info+0x3aa/0x1470 [ 22.137439] RSP: 0018:ffff88003cae6c08 EFLAGS: 00010206 [ 22.137865] RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 22.138520] RDX: 0000000000000006 RSI: 0000000000000002 RDI: 0000000000000030 [ 22.139045] RBP: ffff88003cae6e60 R08: ffffed000db65db9 R09: ffffed000db65db9 [ 22.139575] R10: 0000000000000001 R11: ffffed000db65db8 R12: ffff88006db2edb5 [ 22.140330] R13: 0000000000000000 R14: ffff88006db2eda4 R15: ffff880069f17a00 [ 22.141086] FS: 000000000244d880(0000) GS:ffff88006de00000(0000) knlGS:0000000000000000 [ 22.141845] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 22.142382] CR2: 0000000020b9fff0 CR3: 000000006c124000 CR4: 00000000000006e0 [ 22.143044] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 22.143792] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 22.144455] Call Trace: [ 22.144716] ? ip_route_input_noref+0x1e0/0x1e0 [ 22.145474] ? kasan_unpoison_shadow+0x35/0x50 [ 22.146274] ? fib_create_info+0x38c0/0x38c0 [ 22.146882] ? __kmalloc_node_track_caller+0x47/0x70 [ 22.147280] ? memset+0x31/0x40 [ 22.147514] ? __alloc_skb+0x548/0x740 [ 22.147795] ? lock_acquire+0x1d5/0x580 [ 22.148160] ? lock_acquire+0x1d5/0x580 [ 22.148508] ? inet_rtm_getroute+0xaa0/0x2d60 [ 22.148922] ? lock_release+0xa40/0xa40 [ 22.149300] ? nla_parse+0x29a/0x3d0 [ 22.149628] ? nla_validate+0x1c0/0x1c0 [ 22.149957] inet_rtm_getroute+0xf9c/0x2d60 [ 22.150403] ? ipv4_sk_update_pmtu+0xa90/0xa90 [ 22.151094] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.151930] ? get_kernel_page+0x110/0x110 [ 22.152625] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.153116] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.153486] ? lock_acquire+0x1d5/0x580 [ 22.153792] ? __is_insn_slot_addr+0x1fc/0x330 [ 22.154235] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.154774] ? lock_acquire+0x1d5/0x580 [ 22.155178] ? __is_insn_slot_addr+0x1fc/0x330 [ 22.155640] ? lock_release+0xa40/0xa40 [ 22.156299] ? __read_once_size_nocheck.constprop.8+0x10/0x10 [ 22.156808] ? entry_SYSCALL_64_fastpath+0x1f/0xbe [ 22.157205] ? bpf_prog_kallsyms_find+0xbd/0x440 [ 22.157524] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 22.157977] ? do_raw_spin_trylock+0x190/0x190 [ 22.158379] ? ipv4_sk_update_pmtu+0xa90/0xa90 [ 22.158788] rtnetlink_rcv_msg+0x51c/0x1090 [ 22.159185] ? rtnl_calcit.isra.23+0x4f0/0x4f0 [ 22.159628] ? trace_hardirqs_on+0xd/0x10 [ 22.160017] ? depot_save_stack+0x3b5/0x490 [ 22.160407] ? lock_acquire+0x1d5/0x580 [ 22.160751] ? lock_acquire+0x1d5/0x580 [ 22.161100] ? netlink_lookup+0x5f7/0xa90 [ 22.161463] ? lock_downgrade+0x990/0x990 [ 22.161827] ? vfs_writev+0x18a/0x340 [ 22.162160] ? lock_release+0xa40/0xa40 [ 22.162509] ? lock_acquire+0x1d5/0x580 [ 22.162853] ? lock_acquire+0x1d5/0x580 [ 22.163217] ? ipv4_sk_update_pmtu+0xa90/0xa90 [ 22.163623] ? lock_downgrade+0x990/0x990 [ 22.163983] ? lock_release+0xa40/0xa40 [ 22.164331] ? netlink_lookup+0x620/0xa90 [ 22.164693] ? ipv4_sk_update_pmtu+0xa90/0xa90 [ 22.165089] ? netlink_connect+0x4e0/0x4e0 [ 22.165457] ? netlink_deliver_tap+0x176/0xa60 [ 22.165854] ? iov_iter_advance+0x2a1/0x13f0 [ 22.166236] ? sock_has_perm+0x29c/0x400 [ 22.166587] netlink_rcv_skb+0x216/0x440 [ 22.166859] ? rtnl_calcit.isra.23+0x4f0/0x4f0 [ 22.167253] ? netlink_ack+0xab0/0xab0 [ 22.167602] ? netlink_skb_destructor+0x1d0/0x1d0 [ 22.168024] ? selinux_nlmsg_lookup+0x32b/0x430 [ 22.168427] rtnetlink_rcv+0x1c/0x20 [ 22.168744] netlink_unicast+0x4e8/0x6f0 [ 22.169111] ? netlink_attachskb+0x8a0/0x8a0 [ 22.169538] ? security_netlink_send+0x81/0xb0 [ 22.170008] netlink_sendmsg+0xa4a/0xe60 [ 22.170371] ? netlink_unicast+0x6f0/0x6f0 [ 22.170741] ? security_socket_sendmsg+0x89/0xb0 [ 22.171183] ? netlink_unicast+0x6f0/0x6f0 [ 22.171581] sock_sendmsg+0xca/0x110 [ 22.171909] sock_write_iter+0x31a/0x5d0 [ 22.172271] ? sock_sendmsg+0x110/0x110 [ 22.172634] ? selinux_capset+0x100/0x100 [ 22.172999] ? __might_sleep+0x4c/0x190 [ 22.173365] do_iter_readv_writev+0x525/0x7f0 [ 22.173783] ? vfs_dedupe_file_range+0x900/0x900 [ 22.174226] ? rw_verify_area+0xe5/0x2b0 [ 22.174598] do_iter_write+0x154/0x540 [ 22.174958] ? dup_iter+0x260/0x260 [ 22.175289] ? __do_page_fault+0x51b/0xb60 [ 22.175685] vfs_writev+0x18a/0x340 [ 22.176006] ? __fget_light+0x297/0x380 [ 22.176379] ? vfs_iter_write+0xb0/0xb0 [ 22.176768] ? __handle_mm_fault+0x3980/0x3980 [ 22.177192] ? vmacache_find+0x61/0x270 [ 22.177844] ? vmacache_update+0xfe/0x130 [ 22.178228] ? up_read+0x1a/0x40 [ 22.178534] ? __do_page_fault+0x35b/0xb60 [ 22.178913] ? __fdget_pos+0x130/0x190 [ 22.179266] ? __fdget_raw+0x20/0x20 [ 22.179618] ? do_page_fault+0x70/0x70 [ 22.179971] do_writev+0xfc/0x2a0 [ 22.180285] ? do_writev+0xfc/0x2a0 [ 22.180615] ? vfs_writev+0x340/0x340 [ 22.180957] ? perf_trace_sys_enter+0xc20/0xc20 [ 22.181375] SyS_writev+0x27/0x30 [ 22.181694] entry_SYSCALL_64_fastpath+0x1f/0xbe [ 22.182124] RIP: 0033:0x434ec9 [ 22.182407] RSP: 002b:00007ffd350c8b28 EFLAGS: 00000203 ORIG_RAX: 0000000000000014 [ 22.183083] RAX: ffffffffffffffda RBX: 00000000004002b0 RCX: 0000000000434ec9 [ 22.183716] RDX: 0000000000000001 RSI: 0000000020b9fff0 RDI: 0000000000000003 [ 22.184358] RBP: 00000000006c0018 R08: 0000000000000000 R09: 0000000000000000 [ 22.184998] R10: 0000000000000000 R11: 0000000000000203 R12: 0000000000000000 [ 22.185621] R13: 0000000000401840 R14: 00000000004018d0 R15: 0000000000000000 [ 22.186251] 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 [ 22.188053] RIP: fib_dump_info+0x3aa/0x1470 RSP: ffff88003cae6c08 [ 22.188653] ---[ end trace 3b29c525d3317b76 ]--- [ 22.189098] Kernel panic - not syncing: Fatal exception [ 22.189696] Dumping ftrace buffer: [ 22.190012] (ftrace buffer empty) [ 22.190335] Kernel Offset: disabled [ 22.190665] Rebooting in 86400 seconds..