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-1,10.128.0.20' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   41.339849] ==================================================================
[   41.340953] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   41.341902] Write of size 8 at addr ffff8801d219b500 by task syzkaller159730/2987
[   41.342927] 
[   41.343162] CPU: 1 PID: 2987 Comm: syzkaller159730 Not tainted 4.14.0-rc5+ #142
[   41.344136] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   41.345355] Call Trace:
[   41.345713]  dump_stack+0x194/0x257
[   41.346203]  ? arch_local_irq_restore+0x53/0x53
[   41.346849]  ? show_regs_print_info+0x65/0x65
[   41.347453]  ? __kernel_text_address+0xd/0x40
[   41.348052]  ? __internal_add_timer+0x275/0x2d0
[   41.348676]  print_address_description+0x73/0x250
[   41.349320]  ? __internal_add_timer+0x275/0x2d0
[   41.349943]  kasan_report+0x25b/0x340
[   41.350459]  __asan_report_store8_noabort+0x17/0x20
[   41.351137]  __internal_add_timer+0x275/0x2d0
[   41.351738]  ? calc_wheel_index+0x200/0x200
[   41.352325]  mod_timer+0x622/0x15b0
[   41.352824]  ? mod_timer_pending+0x14e0/0x14e0
[   41.353437]  ? __lock_is_held+0xb6/0x140
[   41.354013]  ? __lock_is_held+0xb6/0x140
[   41.354564]  ? __lockdep_init_map+0xe4/0x650
[   41.355156]  ? lockdep_init_map+0x9/0x10
[   41.355699]  ? init_timer_key+0x126/0x3b0
[   41.356256]  ? try_to_del_timer_sync+0x120/0x120
[   41.356890]  ? round_jiffies_up+0xce/0x100
[   41.357455]  ? __round_jiffies_up_relative+0x150/0x150
[   41.358170]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   41.358825]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   41.359564]  __tun_chr_ioctl+0x1b17/0x3d20
[   41.360994]  ? tun_chr_read_iter+0x1e0/0x1e0
[   41.365365]  ? find_held_lock+0x35/0x1d0
[   41.369402]  ? __do_page_fault+0x64c/0xd60
[   41.373606]  ? lock_downgrade+0x990/0x990
[   41.377728]  ? handle_mm_fault+0x410/0x8d0
[   41.381944]  ? check_same_owner+0x320/0x320
[   41.386230]  ? up_read+0x1a/0x40
[   41.389563]  ? __do_page_fault+0x3d6/0xd60
[   41.393767]  ? tun_chr_compat_ioctl+0x30/0x30
[   41.398229]  tun_chr_ioctl+0x2a/0x40
[   41.401910]  ? tun_chr_ioctl+0x2a/0x40
[   41.405769]  do_vfs_ioctl+0x1b1/0x1520
[   41.409630]  ? ioctl_preallocate+0x2b0/0x2b0
[   41.414006]  ? selinux_capable+0x40/0x40
[   41.418041]  ? syscall_return_slowpath+0x2b3/0x510
[   41.422945]  ? security_file_ioctl+0x89/0xb0
[   41.427321]  SyS_ioctl+0x8f/0xc0
[   41.430659]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.435377] RIP: 0033:0x443dc9
[   41.438532] RSP: 002b:00007ffe30b2ad28 EFLAGS: 00000203 ORIG_RAX: 0000000000000010
[   41.446202] RAX: ffffffffffffffda RBX: 92b7c5cdcceb9f57 RCX: 0000000000443dc9
[   41.453437] RDX: 000000002087ffd8 RSI: 00000000400454ca RDI: 0000000000000005
[   41.460674] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   41.467907] R10: 0000000000000000 R11: 0000000000000203 R12: ce8808c2878d3ab8
[   41.475144] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   41.482394] 
[   41.483988] Allocated by task 2987:
[   41.487578]  save_stack_trace+0x16/0x20
[   41.491516]  save_stack+0x43/0xd0
[   41.494933]  kasan_kmalloc+0xad/0xe0
[   41.498610]  __kmalloc_node+0x47/0x70
[   41.502374]  kvmalloc_node+0x64/0xd0
[   41.506055]  alloc_netdev_mqs+0x16e/0xed0
[   41.510164]  __tun_chr_ioctl+0x12b2/0x3d20
[   41.514362]  tun_chr_ioctl+0x2a/0x40
[   41.518040]  do_vfs_ioctl+0x1b1/0x1520
[   41.521891]  SyS_ioctl+0x8f/0xc0
[   41.525237]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.529955] 
[   41.531547] Freed by task 2987:
[   41.534790]  save_stack_trace+0x16/0x20
[   41.538731]  save_stack+0x43/0xd0
[   41.542149]  kasan_slab_free+0x71/0xc0
[   41.545999]  kfree+0xca/0x250
[   41.549070]  kvfree+0x36/0x60
[   41.552139]  free_netdev+0x2cf/0x360
[   41.555814]  __tun_chr_ioctl+0x2cea/0x3d20
[   41.560009]  tun_chr_ioctl+0x2a/0x40
[   41.563685]  do_vfs_ioctl+0x1b1/0x1520
[   41.567534]  SyS_ioctl+0x8f/0xc0
[   41.570864]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.575582] 
[   41.577176] The buggy address belongs to the object at ffff8801d21981c0
[   41.577176]  which belongs to the cache kmalloc-16384 of size 16384
[   41.590143] The buggy address is located 13120 bytes inside of
[   41.590143]  16384-byte region [ffff8801d21981c0, ffff8801d219c1c0)
[   41.602323] The buggy address belongs to the page:
[   41.607218] page:ffffea0007486600 count:1 mapcount:0 mapping:ffff8801d21981c0 index:0x0 compound_mapcount: 0
[   41.617149] flags: 0x200000000008100(slab|head)
[   41.621788] raw: 0200000000008100 ffff8801d21981c0 0000000000000000 0000000100000001
[   41.629632] raw: ffffea000765a020 ffffea000747f020 ffff8801dac02200 0000000000000000
[   41.637472] page dumped because: kasan: bad access detected
[   41.643145] 
[   41.644735] Memory state around the buggy address:
[   41.649626]  ffff8801d219b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.656954]  ffff8801d219b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.664278] >ffff8801d219b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.671598]                    ^
[   41.674929]  ffff8801d219b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.682251]  ffff8801d219b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.689570] ==================================================================
[   41.696891] Disabling lock debugging due to kernel taint
[   41.702305] Kernel panic - not syncing: panic_on_warn set ...
[   41.702305] 
[   41.709629] CPU: 1 PID: 2987 Comm: syzkaller159730 Tainted: G    B           4.14.0-rc5+ #142
[   41.718251] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   41.727569] Call Trace:
[   41.730124]  dump_stack+0x194/0x257
[   41.733718]  ? arch_local_irq_restore+0x53/0x53
[   41.738350]  ? kasan_end_report+0x32/0x50
[   41.742461]  ? lock_downgrade+0x990/0x990
[   41.746573]  ? __internal_add_timer+0x1f0/0x2d0
[   41.751206]  panic+0x1e4/0x417
[   41.754364]  ? __warn+0x1d9/0x1d9
[   41.757787]  ? __internal_add_timer+0x275/0x2d0
[   41.762417]  kasan_end_report+0x50/0x50
[   41.766353]  kasan_report+0x144/0x340
[   41.770123]  __asan_report_store8_noabort+0x17/0x20
[   41.775103]  __internal_add_timer+0x275/0x2d0
[   41.779562]  ? calc_wheel_index+0x200/0x200
[   41.783853]  mod_timer+0x622/0x15b0
[   41.787449]  ? mod_timer_pending+0x14e0/0x14e0
[   41.791993]  ? __lock_is_held+0xb6/0x140
[   41.796024]  ? __lock_is_held+0xb6/0x140
[   41.800052]  ? __lockdep_init_map+0xe4/0x650
[   41.804425]  ? lockdep_init_map+0x9/0x10
[   41.808446]  ? init_timer_key+0x126/0x3b0
[   41.812558]  ? try_to_del_timer_sync+0x120/0x120
[   41.817278]  ? round_jiffies_up+0xce/0x100
[   41.821474]  ? __round_jiffies_up_relative+0x150/0x150
[   41.827225]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   41.832118]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   41.837622]  __tun_chr_ioctl+0x1b17/0x3d20
[   41.841825]  ? tun_chr_read_iter+0x1e0/0x1e0
[   41.846197]  ? find_held_lock+0x35/0x1d0
[   41.850226]  ? __do_page_fault+0x64c/0xd60
[   41.854425]  ? lock_downgrade+0x990/0x990
[   41.858541]  ? handle_mm_fault+0x410/0x8d0
[   41.862746]  ? check_same_owner+0x320/0x320
[   41.867033]  ? up_read+0x1a/0x40
[   41.870363]  ? __do_page_fault+0x3d6/0xd60
[   41.874562]  ? tun_chr_compat_ioctl+0x30/0x30
[   41.879022]  tun_chr_ioctl+0x2a/0x40
[   41.882698]  ? tun_chr_ioctl+0x2a/0x40
[   41.886549]  do_vfs_ioctl+0x1b1/0x1520
[   41.890403]  ? ioctl_preallocate+0x2b0/0x2b0
[   41.894775]  ? selinux_capable+0x40/0x40
[   41.898804]  ? syscall_return_slowpath+0x2b3/0x510
[   41.903703]  ? security_file_ioctl+0x89/0xb0
[   41.908076]  SyS_ioctl+0x8f/0xc0
[   41.911412]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.916132] RIP: 0033:0x443dc9
[   41.919285] RSP: 002b:00007ffe30b2ad28 EFLAGS: 00000203 ORIG_RAX: 0000000000000010
[   41.926957] RAX: ffffffffffffffda RBX: 92b7c5cdcceb9f57 RCX: 0000000000443dc9
[   41.934190] RDX: 000000002087ffd8 RSI: 00000000400454ca RDI: 0000000000000005
[   41.941423] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   41.948656] R10: 0000000000000000 R11: 0000000000000203 R12: ce8808c2878d3ab8
[   41.955891] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   41.963167] Dumping ftrace buffer:
[   41.966670]    (ftrace buffer empty)
[   41.970346] Kernel Offset: disabled
[   41.973940] Rebooting in 86400 seconds..