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-mmots-kasan-gce-8,10.128.0.29' (ECDSA) to the list of known hosts.
net.ipv6.conf.syz0.accept_dad = 0
net.ipv6.conf.syz0.router_solicitations = 0
executing program
syzkaller login: [   33.093918] ------------[ cut here ]------------
[   33.094737] WARNING: CPU: 1 PID: 2988 at drivers/net/tun.c:1744 tun_get_user+0x2de3/0x36d0
[   33.096021] Kernel panic - not syncing: panic_on_warn set ...
[   33.096021] 
[   33.097034] CPU: 1 PID: 2988 Comm: syzkaller185540 Not tainted 4.14.0-rc5-mm1+ #20
[   33.098042] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   33.099260] Call Trace:
[   33.099620]  dump_stack+0x194/0x257
[   33.100113]  ? arch_local_irq_restore+0x53/0x53
[   33.100740]  ? vsnprintf+0x1ed/0x1900
[   33.101257]  panic+0x1e4/0x41c
[   33.101709]  ? refcount_error_report+0x214/0x214
[   33.102342]  ? show_regs_print_info+0x65/0x65
[   33.102949]  ? __warn+0x1a9/0x1e0
[   33.103429]  ? tun_get_user+0x2de3/0x36d0
[   33.103983]  __warn+0x1c4/0x1e0
[   33.104427]  ? tun_get_user+0x2de3/0x36d0
[   33.104983]  report_bug+0x211/0x2d0
[   33.105477]  fixup_bug+0x40/0x90
[   33.105933]  do_trap+0x260/0x390
[   33.106395]  do_error_trap+0x120/0x390
[   33.106918]  ? kfree_skbmem+0xe2/0x1d0
[   33.107441]  ? do_trap+0x390/0x390
[   33.107917]  ? __mutex_unlock_slowpath+0xe9/0xac0
[   33.108577]  ? tun_get_user+0x2de3/0x36d0
[   33.109133]  ? wait_for_completion+0x770/0x770
[   33.109750]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   33.110399]  do_invalid_op+0x1b/0x20
[   33.110897]  invalid_op+0x18/0x20
[   33.111389] RIP: 0010:tun_get_user+0x2de3/0x36d0
[   33.112020] RSP: 0018:ffff8801d1c0f730 EFLAGS: 00010286
[   33.112729] RAX: dffffc0000000000 RBX: ffff8801d2041b18 RCX: dffffc0000000000
[   33.113680] RDX: ffffffff87024180 RSI: 0000000000000000 RDI: 0000000000000282
[   33.118589] RBP: ffff8801d1c0fae0 R08: 0000000000000001 R09: 0000000000000000
[   33.125824] R10: ffffffff87069320 R11: 0000000000000000 R12: ffff8801d11ec340
[   33.133060] R13: ffff8801d2041b88 R14: 0000000000000000 R15: ffff8801d2028d40
[   33.140333]  ? tun_build_skb.isra.48+0x16e0/0x16e0
[   33.145233]  ? __bpf_prog_release+0xb1/0xf0
[   33.149521]  ? bpf_prepare_filter+0x2e7/0xe00
[   33.153986]  ? check_noncircular+0x20/0x20
[   33.158199]  ? tun_get+0x1ab/0x2e0
[   33.161707]  ? do_seccomp+0x1c7b/0x21f0
[   33.165649]  ? lock_release+0xa40/0xa40
[   33.169593]  ? __lock_is_held+0xb6/0x140
[   33.173630]  ? tun_get+0x1d4/0x2e0
[   33.177136]  ? tun_chr_close+0x60/0x60
[   33.180991]  ? __check_object_size+0x25d/0x4f0
[   33.185538]  ? rcu_note_context_switch+0x710/0x710
[   33.190438]  tun_chr_write_iter+0xb9/0x160
[   33.194639]  do_iter_readv_writev+0x525/0x7f0
[   33.199103]  ? vfs_dedupe_file_range+0x8f0/0x8f0
[   33.203831]  ? rw_verify_area+0xe5/0x2b0
[   33.207862]  do_iter_write+0x154/0x540
[   33.211716]  ? dup_iter+0x260/0x260
[   33.215321]  vfs_writev+0x18a/0x340
[   33.218913]  ? __fget_light+0x297/0x380
[   33.222856]  ? vfs_iter_write+0xb0/0xb0
[   33.226797]  ? up_read+0x1a/0x40
[   33.230130]  ? __do_page_fault+0x3d6/0xd60
[   33.234337]  ? security_mmap_file+0x143/0x180
[   33.238807]  ? mm_fault_error+0x2c0/0x2c0
[   33.242927]  ? __fdget_pos+0x130/0x190
[   33.246782]  ? __fdget_raw+0x20/0x20
[   33.250465]  ? __do_page_fault+0xd60/0xd60
[   33.254668]  do_writev+0xfc/0x2a0
[   33.258086]  ? do_writev+0xfc/0x2a0
[   33.261681]  ? vfs_writev+0x340/0x340
[   33.265450]  ? entry_SYSCALL_64_fastpath+0x5/0xbe
[   33.270261]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   33.275250]  SyS_writev+0x27/0x30
[   33.278688]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   33.283408] RIP: 0033:0x444b30
[   33.286564] RSP: 002b:00007ffc0c3bf118 EFLAGS: 00000246 ORIG_RAX: 0000000000000014
[   33.294236] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000444b30
[   33.301472] RDX: 0000000000000002 RSI: 00007ffc0c3bf120 RDI: 0000000000000003
[   33.308706] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000001
[   33.315940] R10: 0000000002000004 R11: 0000000000000246 R12: 0000000000402240
[   33.323177] R13: 00000000004022d0 R14: 0000000000000000 R15: 0000000000000000
[   33.330851] Dumping ftrace buffer:
[   33.334383]    (ftrace buffer empty)
[   33.338060] Kernel Offset: disabled
[   33.341655] Rebooting in 86400 seconds..