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-8,10.128.0.31' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   41.299931] ==================================================================
[   41.301035] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   41.301957] Write of size 8 at addr ffff8801d218b500 by task syzkaller568273/2992
[   41.302956] 
[   41.303194] CPU: 1 PID: 2992 Comm: syzkaller568273 Not tainted 4.14.0-rc5+ #142
[   41.304169] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   41.305398] Call Trace:
[   41.305758]  dump_stack+0x194/0x257
[   41.306289]  ? arch_local_irq_restore+0x53/0x53
[   41.306944]  ? show_regs_print_info+0x65/0x65
[   41.307569]  ? __kernel_text_address+0xd/0x40
[   41.308171]  ? __internal_add_timer+0x275/0x2d0
[   41.308800]  print_address_description+0x73/0x250
[   41.309445]  ? __internal_add_timer+0x275/0x2d0
[   41.310078]  kasan_report+0x25b/0x340
[   41.310592]  __asan_report_store8_noabort+0x17/0x20
[   41.311258]  __internal_add_timer+0x275/0x2d0
[   41.311886]  ? calc_wheel_index+0x200/0x200
[   41.312477]  mod_timer+0x622/0x15b0
[   41.312978]  ? mod_timer_pending+0x14e0/0x14e0
[   41.313608]  ? __lock_is_held+0xb6/0x140
[   41.314167]  ? __lock_is_held+0xb6/0x140
[   41.314718]  ? __lockdep_init_map+0xe4/0x650
[   41.315310]  ? lockdep_init_map+0x9/0x10
[   41.315854]  ? init_timer_key+0x126/0x3b0
[   41.316429]  ? try_to_del_timer_sync+0x120/0x120
[   41.317064]  ? round_jiffies_up+0xce/0x100
[   41.317635]  ? __round_jiffies_up_relative+0x150/0x150
[   41.318377]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   41.319037]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   41.319781]  __tun_chr_ioctl+0x1b17/0x3d20
[   41.320377]  ? tun_chr_read_iter+0x1e0/0x1e0
[   41.324753]  ? find_held_lock+0x35/0x1d0
[   41.328792]  ? __do_page_fault+0x64c/0xd60
[   41.332996]  ? lock_downgrade+0x990/0x990
[   41.337121]  ? handle_mm_fault+0x410/0x8d0
[   41.341342]  ? check_same_owner+0x320/0x320
[   41.345632]  ? up_read+0x1a/0x40
[   41.348973]  ? __do_page_fault+0x3d6/0xd60
[   41.353179]  ? tun_chr_compat_ioctl+0x30/0x30
[   41.357642]  tun_chr_ioctl+0x2a/0x40
[   41.361323]  ? tun_chr_ioctl+0x2a/0x40
[   41.365182]  do_vfs_ioctl+0x1b1/0x1520
[   41.369051]  ? ioctl_preallocate+0x2b0/0x2b0
[   41.373432]  ? selinux_capable+0x40/0x40
[   41.377463]  ? putname+0xf3/0x130
[   41.380888]  ? do_sys_open+0x320/0x6d0
[   41.384751]  ? security_file_ioctl+0x89/0xb0
[   41.389132]  SyS_ioctl+0x8f/0xc0
[   41.392473]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.397194] RIP: 0033:0x443dc9
[   41.400353] RSP: 002b:00007fffaada4d88 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[   41.408030] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   41.415266] RDX: 000000002003a000 RSI: 00000000400454ca RDI: 0000000000000004
[   41.422502] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   41.429739] R10: 0000000000000000 R11: 0000000000000202 R12: f0f3b45b3b087d9b
[   41.436986] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   41.444241] 
[   41.445835] Allocated by task 2992:
[   41.449438]  save_stack_trace+0x16/0x20
[   41.453381]  save_stack+0x43/0xd0
[   41.456802]  kasan_kmalloc+0xad/0xe0
[   41.460487]  __kmalloc_node+0x47/0x70
[   41.464259]  kvmalloc_node+0x64/0xd0
[   41.467941]  alloc_netdev_mqs+0x16e/0xed0
[   41.472055]  __tun_chr_ioctl+0x12b2/0x3d20
[   41.476254]  tun_chr_ioctl+0x2a/0x40
[   41.479937]  do_vfs_ioctl+0x1b1/0x1520
[   41.483791]  SyS_ioctl+0x8f/0xc0
[   41.487124]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.491849] 
[   41.493446] Freed by task 2992:
[   41.496695]  save_stack_trace+0x16/0x20
[   41.500638]  save_stack+0x43/0xd0
[   41.504057]  kasan_slab_free+0x71/0xc0
[   41.507911]  kfree+0xca/0x250
[   41.510986]  kvfree+0x36/0x60
[   41.514062]  free_netdev+0x2cf/0x360
[   41.517743]  __tun_chr_ioctl+0x2cea/0x3d20
[   41.521943]  tun_chr_ioctl+0x2a/0x40
[   41.525625]  do_vfs_ioctl+0x1b1/0x1520
[   41.529480]  SyS_ioctl+0x8f/0xc0
[   41.532815]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.537537] 
[   41.539150] The buggy address belongs to the object at ffff8801d21881c0
[   41.539150]  which belongs to the cache kmalloc-16384 of size 16384
[   41.552120] The buggy address is located 13120 bytes inside of
[   41.552120]  16384-byte region [ffff8801d21881c0, ffff8801d218c1c0)
[   41.564307] The buggy address belongs to the page:
[   41.569207] page:ffffea0007486200 count:1 mapcount:0 mapping:ffff8801d21881c0 index:0x0 compound_mapcount: 0
[   41.579145] flags: 0x200000000008100(slab|head)
[   41.583781] raw: 0200000000008100 ffff8801d21881c0 0000000000000000 0000000100000001
[   41.591628] raw: ffffea0007645820 ffffea0007471820 ffff8801dac02200 0000000000000000
[   41.599471] page dumped because: kasan: bad access detected
[   41.605144] 
[   41.606739] Memory state around the buggy address:
[   41.611634]  ffff8801d218b400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.618960]  ffff8801d218b480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.626288] >ffff8801d218b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.633615]                    ^
[   41.636955]  ffff8801d218b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.644282]  ffff8801d218b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   41.651605] ==================================================================
[   41.658931] Disabling lock debugging due to kernel taint
[   41.664348] Kernel panic - not syncing: panic_on_warn set ...
[   41.664348] 
[   41.671677] CPU: 1 PID: 2992 Comm: syzkaller568273 Tainted: G    B           4.14.0-rc5+ #142
[   41.680298] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   41.689615] Call Trace:
[   41.692178]  dump_stack+0x194/0x257
[   41.695775]  ? arch_local_irq_restore+0x53/0x53
[   41.700410]  ? kasan_end_report+0x32/0x50
[   41.704527]  ? lock_downgrade+0x990/0x990
[   41.708645]  ? __internal_add_timer+0x1f0/0x2d0
[   41.713280]  panic+0x1e4/0x417
[   41.716440]  ? __warn+0x1d9/0x1d9
[   41.719865]  ? __internal_add_timer+0x275/0x2d0
[   41.724501]  kasan_end_report+0x50/0x50
[   41.728440]  kasan_report+0x144/0x340
[   41.732209]  __asan_report_store8_noabort+0x17/0x20
[   41.737192]  __internal_add_timer+0x275/0x2d0
[   41.741655]  ? calc_wheel_index+0x200/0x200
[   41.745950]  mod_timer+0x622/0x15b0
[   41.749548]  ? mod_timer_pending+0x14e0/0x14e0
[   41.754107]  ? __lock_is_held+0xb6/0x140
[   41.758144]  ? __lock_is_held+0xb6/0x140
[   41.762175]  ? __lockdep_init_map+0xe4/0x650
[   41.766552]  ? lockdep_init_map+0x9/0x10
[   41.770579]  ? init_timer_key+0x126/0x3b0
[   41.774698]  ? try_to_del_timer_sync+0x120/0x120
[   41.779420]  ? round_jiffies_up+0xce/0x100
[   41.783618]  ? __round_jiffies_up_relative+0x150/0x150
[   41.788865]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   41.793768]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   41.799277]  __tun_chr_ioctl+0x1b17/0x3d20
[   41.803482]  ? tun_chr_read_iter+0x1e0/0x1e0
[   41.807854]  ? find_held_lock+0x35/0x1d0
[   41.811885]  ? __do_page_fault+0x64c/0xd60
[   41.816085]  ? lock_downgrade+0x990/0x990
[   41.820204]  ? handle_mm_fault+0x410/0x8d0
[   41.824413]  ? check_same_owner+0x320/0x320
[   41.828696]  ? up_read+0x1a/0x40
[   41.832028]  ? __do_page_fault+0x3d6/0xd60
[   41.836228]  ? tun_chr_compat_ioctl+0x30/0x30
[   41.840687]  tun_chr_ioctl+0x2a/0x40
[   41.844365]  ? tun_chr_ioctl+0x2a/0x40
[   41.848217]  do_vfs_ioctl+0x1b1/0x1520
[   41.852072]  ? ioctl_preallocate+0x2b0/0x2b0
[   41.856446]  ? selinux_capable+0x40/0x40
[   41.860473]  ? putname+0xf3/0x130
[   41.863896]  ? do_sys_open+0x320/0x6d0
[   41.867753]  ? security_file_ioctl+0x89/0xb0
[   41.872130]  SyS_ioctl+0x8f/0xc0
[   41.875463]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   41.880184] RIP: 0033:0x443dc9
[   41.883341] RSP: 002b:00007fffaada4d88 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[   41.891013] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   41.898250] RDX: 000000002003a000 RSI: 00000000400454ca RDI: 0000000000000004
[   41.905487] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   41.912723] R10: 0000000000000000 R11: 0000000000000202 R12: f0f3b45b3b087d9b
[   41.919959] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   41.927242] Dumping ftrace buffer:
[   41.930749]    (ftrace buffer empty)
[   41.934427] Kernel Offset: disabled
[   41.938048] Rebooting in 86400 seconds..