serialport: Connected to syzkaller.us-central1-c.ci-upstream-kasan-gce-3 port 1 (session ID: 4205cb363386d61afa65dee406f40c43004cea3de158f749a46d470d540bccb6, active connections: 1).
INIT: Entering runlevel: 2

[info] Using makefile-style concurrent boot in runlevel 2.
[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c.

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added 'ci-upstream-kasan-gce-3,10.128.0.20' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   57.771406] usercopy: kernel memory exposure attempt detected from ffff8801d1ea480e (<wrapped address>) (18446744073709551610 bytes)
[   57.773218] ------------[ cut here ]------------
[   57.773886] kernel BUG at mm/usercopy.c:72!
[   57.774701] invalid opcode: 0000 [#1] SMP KASAN
[   57.775434] Dumping ftrace buffer:
[   57.775975]    (ftrace buffer empty)
[   57.776467] Modules linked in:
[   57.776951] CPU: 0 PID: 2917 Comm: syzkaller842281 Not tainted 4.13.0-rc3+ #16
[   57.777965] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   57.779181] task: ffff8801d2fa40c0 task.stack: ffff8801d1fe8000
[   57.779998] RIP: 0010:__check_object_size+0x3ad/0x500
[   57.780741] RSP: 0018:ffff8801d1fef8a8 EFLAGS: 00010286
[   57.781447] RAX: 0000000000000078 RBX: ffffffff847102c0 RCX: 0000000000000000
[   57.782450] RDX: 0000000000000078 RSI: 1ffff1003a3fded5 RDI: ffffed003a3fdf09
[   57.783427] RBP: ffff8801d1fef998 R08: 0000000000000001 R09: 0000000000000000
[   57.784374] R10: 0000000000000000 R11: 0000000000000000 R12: ffff8801d1ea480e
[   57.785321] R13: fffffffffffffffa R14: ffffffff84710280 R15: dffffc0000000000
[   57.786377] FS:  0000000001360880(0000) GS:ffff8801dc000000(0000) knlGS:0000000000000000
[   57.787477] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   57.788282] CR2: 00000000202ecfe4 CR3: 00000001d1ff8000 CR4: 00000000001406f0
[   57.789276] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   57.790225] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   57.791174] Call Trace:
[   57.791546]  ? finish_task_switch+0x1d3/0x740
[   57.796041]  ? check_stack_object+0x140/0x140
[   57.800503]  ? do_raw_spin_trylock+0x190/0x190
[   57.805055]  ? lock_release+0xa40/0xa40
[   57.808994]  ? compat_start_thread+0x80/0x80
[   57.813370]  udpv6_recvmsg+0x1040/0x1af0
[   57.817526]  ? udp_lib_close+0x20/0x20
[   57.821387]  ? preempt_notifier_dec+0x20/0x20
[   57.825863]  ? __schedule+0x8f0/0x2070
[   57.829722]  ? sock_has_perm+0x29c/0x400
[   57.833749]  ? __sched_text_start+0x8/0x8
[   57.837870]  inet_recvmsg+0x14c/0x5f0
[   57.841637]  ? inet_create+0xf50/0xf50
[   57.845492]  ? inet_sendmsg+0x11f/0x5e0
[   57.849428]  ? inet_sendmsg+0x126/0x5e0
[   57.853373]  ? selinux_socket_recvmsg+0x36/0x40
[   57.858015]  ? security_socket_recvmsg+0x91/0xc0
[   57.862740]  ? inet_create+0xf50/0xf50
[   57.866594]  sock_recvmsg+0xc9/0x110
[   57.870271]  ? sockfd_lookup_light+0x104/0x150
[   57.874823]  SYSC_recvfrom+0x2d6/0x570
[   57.878679]  ? SYSC_getpeername+0x460/0x460
[   57.882972]  ? find_held_lock+0x35/0x1d0
[   57.887008]  ? exit_to_usermode_loop+0x98/0x2d0
[   57.891653]  ? trace_hardirqs_off+0xd/0x10
[   57.895862]  ? exit_to_usermode_loop+0x1dc/0x2d0
[   57.900597]  ? down_read_trylock+0xdb/0x170
[   57.904886]  ? __do_page_fault+0x2b8/0xb60
[   57.909096]  ? syscall_return_slowpath+0x22f/0x450
[   57.914005]  ? prepare_exit_to_usermode+0x220/0x220
[   57.919007]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   57.923882]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   57.928892]  SyS_recvfrom+0x40/0x50
[   57.932498]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   57.937224] RIP: 0033:0x43fe59
[   57.940380] RSP: 002b:00007ffe9d04e668 EFLAGS: 00000203 ORIG_RAX: 000000000000002d
[   57.948070] RAX: ffffffffffffffda RBX: 00000000006ccd60 RCX: 000000000043fe59
[   57.955313] RDX: 0000000000000000 RSI: 00000000207df000 RDI: 0000000000000004
[   57.962556] RBP: 0000000000000082 R08: 000000002034eff6 R09: 0000000000000008
[   57.969808] R10: 0000000020000043 R11: 0000000000000203 R12: ffffffffffffffff
[   57.977052] R13: 9abcdb1737225b7b R14: 0000000000000000 R15: 0000000000000000
[   57.984304] Code: 48 0f 44 da e8 c5 d5 ca ff 48 8b 85 28 ff ff ff 4d 89 e9 4c 89 e1 4c 89 f2 48 89 de 48 c7 c7 00 03 71 84 49 89 c0 e8 a8 49 b6 ff <0f> 0b 48 c7 c0 c0 00 71 84 eb 96 48 c7 c0 00 01 71 84 eb 8d 48 
[   58.003378] RIP: __check_object_size+0x3ad/0x500 RSP: ffff8801d1fef8a8
[   58.010071] ---[ end trace 2141bb72cdf9cbf2 ]---
[   58.014963] Kernel panic - not syncing: Fatal exception
[   58.020326] Dumping ftrace buffer:
[   58.023834]    (ftrace buffer empty)
[   58.027510] Kernel Offset: disabled
[   58.031117] Rebooting in 86400 seconds..