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-next-kasan-gce-2,10.128.0.3' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   38.547907] ==================================================================
[   38.555319] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   38.562303] Write of size 8 at addr ffff8801ce55b6c8 by task syzkaller469057/2981
[   38.569889] 
[   38.571488] CPU: 1 PID: 2981 Comm: syzkaller469057 Not tainted 4.13.0-next-20170913+ #21
[   38.579680] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   38.589004] Call Trace:
[   38.591561]  dump_stack+0x194/0x257
[   38.595166]  ? arch_local_irq_restore+0x53/0x53
[   38.599804]  ? show_regs_print_info+0x65/0x65
[   38.604274]  ? __internal_add_timer+0x275/0x2d0
[   38.608916]  print_address_description+0x73/0x250
[   38.613727]  ? __internal_add_timer+0x275/0x2d0
[   38.618371]  kasan_report+0x24e/0x340
[   38.622156]  __asan_report_store8_noabort+0x17/0x20
[   38.627141]  __internal_add_timer+0x275/0x2d0
[   38.631607]  ? calc_wheel_index+0x200/0x200
[   38.635908]  mod_timer+0x622/0x15b0
[   38.639513]  ? mod_timer_pending+0x14e0/0x14e0
[   38.644064]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   38.649050]  ? trace_hardirqs_on+0xd/0x10
[   38.653170]  ? _crng_backtrack_protect+0xd9/0x130
[   38.657990]  ? __lock_is_held+0xbc/0x140
[   38.662021]  ? __lockdep_init_map+0xe4/0x650
[   38.666402]  ? lockdep_init_map+0x3d/0x70
[   38.670518]  ? rcu_read_lock_sched_held+0x108/0x120
[   38.675506]  ? init_timer_key+0x126/0x3b0
[   38.679623]  ? try_to_del_timer_sync+0x120/0x120
[   38.684357]  ? round_jiffies_up+0xce/0x100
[   38.688601]  ? __round_jiffies_up_relative+0x150/0x150
[   38.693855]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   38.698765]  __tun_chr_ioctl+0x1b23/0x3d20
[   38.702978]  ? tun_chr_read_iter+0x1e0/0x1e0
[   38.707366]  ? lock_downgrade+0x990/0x990
[   38.711507]  ? check_same_owner+0x320/0x320
[   38.715799]  ? __handle_mm_fault+0x39c0/0x39c0
[   38.720348]  ? vmacache_find+0x61/0x270
[   38.724305]  ? tun_chr_compat_ioctl+0x30/0x30
[   38.728769]  tun_chr_ioctl+0x2a/0x40
[   38.732450]  ? tun_chr_ioctl+0x2a/0x40
[   38.736310]  do_vfs_ioctl+0x1b1/0x1530
[   38.740179]  ? ioctl_preallocate+0x2b0/0x2b0
[   38.744558]  ? selinux_capable+0x40/0x40
[   38.748592]  ? putname+0xf3/0x130
[   38.752018]  ? do_sys_open+0x320/0x6d0
[   38.755883]  ? security_file_ioctl+0x7d/0xb0
[   38.760260]  ? security_file_ioctl+0x89/0xb0
[   38.764640]  SyS_ioctl+0x8f/0xc0
[   38.767983]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   38.772706] RIP: 0033:0x443db9
[   38.775863] RSP: 002b:00007ffd030192c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[   38.783541] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443db9
[   38.790785] RDX: 0000000020521fd8 RSI: 00000000400454ca RDI: 0000000000000004
[   38.798024] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   38.805262] R10: 0000000000000000 R11: 0000000000000202 R12: 4f2c96c3699c0cef
[   38.812502] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   38.819757] 
[   38.821353] Allocated by task 2981:
[   38.824952]  save_stack_trace+0x16/0x20
[   38.828898]  save_stack+0x43/0xd0
[   38.832319]  kasan_kmalloc+0xad/0xe0
[   38.836001]  __kmalloc_node+0x47/0x70
[   38.839773]  kvmalloc_node+0x64/0xd0
[   38.843457]  alloc_netdev_mqs+0x16e/0xed0
[   38.847572]  __tun_chr_ioctl+0x12be/0x3d20
[   38.851773]  tun_chr_ioctl+0x2a/0x40
[   38.855453]  do_vfs_ioctl+0x1b1/0x1530
[   38.859308]  SyS_ioctl+0x8f/0xc0
[   38.862643]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   38.867364] 
[   38.868960] Freed by task 2981:
[   38.872209]  save_stack_trace+0x16/0x20
[   38.876148]  save_stack+0x43/0xd0
[   38.879569]  kasan_slab_free+0x71/0xc0
[   38.883426]  kfree+0xca/0x250
[   38.886502]  kvfree+0x36/0x60
[   38.889577]  free_netdev+0x2cf/0x360
[   38.893259]  __tun_chr_ioctl+0x2cf6/0x3d20
[   38.897464]  tun_chr_ioctl+0x2a/0x40
[   38.901148]  do_vfs_ioctl+0x1b1/0x1530
[   38.905000]  SyS_ioctl+0x8f/0xc0
[   38.908336]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   38.913056] 
[   38.914653] The buggy address belongs to the object at ffff8801ce5582c0
[   38.914653]  which belongs to the cache kmalloc-16384 of size 16384
[   38.927621] The buggy address is located 13320 bytes inside of
[   38.927621]  16384-byte region [ffff8801ce5582c0, ffff8801ce55c2c0)
[   38.939813] The buggy address belongs to the page:
[   38.944708] page:ffffea0007395600 count:1 mapcount:0 mapping:ffff8801ce5582c0 index:0x0 compound_mapcount: 0
[   38.954648] flags: 0x200000000008100(slab|head)
[   38.959286] raw: 0200000000008100 ffff8801ce5582c0 0000000000000000 0000000100000001
[   38.967133] raw: ffffea0007554220 ffffea000739da20 ffff8801dac02200 0000000000000000
[   38.974978] page dumped because: kasan: bad access detected
[   38.980652] 
[   38.982249] Memory state around the buggy address:
[   38.987147]  ffff8801ce55b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   38.994473]  ffff8801ce55b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   39.001799] >ffff8801ce55b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   39.009122]                                               ^
[   39.014798]  ffff8801ce55b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   39.022123]  ffff8801ce55b780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   39.029446] ==================================================================
[   39.036770] Disabling lock debugging due to kernel taint
[   39.042179] Kernel panic - not syncing: panic_on_warn set ...
[   39.042179] 
[   39.049503] CPU: 1 PID: 2981 Comm: syzkaller469057 Tainted: G    B           4.13.0-next-20170913+ #21
[   39.058905] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   39.068222] Call Trace:
[   39.070775]  dump_stack+0x194/0x257
[   39.074367]  ? arch_local_irq_restore+0x53/0x53
[   39.079000]  ? vprintk_default+0x28/0x30
[   39.083027]  ? __internal_add_timer+0x1f0/0x2d0
[   39.087658]  panic+0x1e4/0x417
[   39.090813]  ? __warn+0x1d9/0x1d9
[   39.094235]  ? __internal_add_timer+0x275/0x2d0
[   39.098869]  kasan_end_report+0x50/0x50
[   39.102805]  kasan_report+0x137/0x340
[   39.106574]  __asan_report_store8_noabort+0x17/0x20
[   39.111552]  __internal_add_timer+0x275/0x2d0
[   39.116011]  ? calc_wheel_index+0x200/0x200
[   39.120303]  mod_timer+0x622/0x15b0
[   39.123898]  ? mod_timer_pending+0x14e0/0x14e0
[   39.128443]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   39.133424]  ? trace_hardirqs_on+0xd/0x10
[   39.137539]  ? _crng_backtrack_protect+0xd9/0x130
[   39.142349]  ? __lock_is_held+0xbc/0x140
[   39.146375]  ? __lockdep_init_map+0xe4/0x650
[   39.150748]  ? lockdep_init_map+0x3d/0x70
[   39.154860]  ? rcu_read_lock_sched_held+0x108/0x120
[   39.159839]  ? init_timer_key+0x126/0x3b0
[   39.163950]  ? try_to_del_timer_sync+0x120/0x120
[   39.168673]  ? round_jiffies_up+0xce/0x100
[   39.172870]  ? __round_jiffies_up_relative+0x150/0x150
[   39.178109]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   39.183008]  __tun_chr_ioctl+0x1b23/0x3d20
[   39.187212]  ? tun_chr_read_iter+0x1e0/0x1e0
[   39.191598]  ? lock_downgrade+0x990/0x990
[   39.195723]  ? check_same_owner+0x320/0x320
[   39.200007]  ? __handle_mm_fault+0x39c0/0x39c0
[   39.204552]  ? vmacache_find+0x61/0x270
[   39.208490]  ? tun_chr_compat_ioctl+0x30/0x30
[   39.212949]  tun_chr_ioctl+0x2a/0x40
[   39.216624]  ? tun_chr_ioctl+0x2a/0x40
[   39.220474]  do_vfs_ioctl+0x1b1/0x1530
[   39.224329]  ? ioctl_preallocate+0x2b0/0x2b0
[   39.228703]  ? selinux_capable+0x40/0x40
[   39.232726]  ? putname+0xf3/0x130
[   39.236147]  ? do_sys_open+0x320/0x6d0
[   39.240001]  ? security_file_ioctl+0x7d/0xb0
[   39.244371]  ? security_file_ioctl+0x89/0xb0
[   39.248744]  SyS_ioctl+0x8f/0xc0
[   39.252078]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   39.256795] RIP: 0033:0x443db9
[   39.259947] RSP: 002b:00007ffd030192c8 EFLAGS: 00000202 ORIG_RAX: 0000000000000010
[   39.267616] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443db9
[   39.274851] RDX: 0000000020521fd8 RSI: 00000000400454ca RDI: 0000000000000004
[   39.282087] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   39.289327] R10: 0000000000000000 R11: 0000000000000202 R12: 4f2c96c3699c0cef
[   39.296559] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   39.303836] Dumping ftrace buffer:
[   39.307341]    (ftrace buffer empty)
[   39.311015] Kernel Offset: disabled
[   39.314605] Rebooting in 86400 seconds..