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-2,10.128.0.60' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   34.448295] ==================================================================
[   34.449659] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   34.450709] Write of size 8 at addr ffff8801ce0536c8 by task syzkaller030238/2985
[   34.451897] 
[   34.452145] CPU: 0 PID: 2985 Comm: syzkaller030238 Not tainted 4.13.0-next-20170906+ #16
[   34.453395] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.454645] Call Trace:
[   34.455010]  dump_stack+0x194/0x257
[   34.455508]  ? arch_local_irq_restore+0x53/0x53
[   34.456159]  ? show_regs_print_info+0x65/0x65
[   34.456773]  ? __internal_add_timer+0x275/0x2d0
[   34.457405]  print_address_description+0x73/0x250
[   34.458055]  ? __internal_add_timer+0x275/0x2d0
[   34.458714]  kasan_report+0x24e/0x340
[   34.459251]  __asan_report_store8_noabort+0x17/0x20
[   34.459923]  __internal_add_timer+0x275/0x2d0
[   34.460591]  ? calc_wheel_index+0x200/0x200
[   34.461183]  mod_timer+0x622/0x15b0
[   34.461687]  ? mod_timer_pending+0x14e0/0x14e0
[   34.462336]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.463068]  ? trace_hardirqs_on+0xd/0x10
[   34.463647]  ? _crng_backtrack_protect+0xd9/0x130
[   34.464317]  ? __lock_is_held+0xbc/0x140
[   34.464914]  ? __lockdep_init_map+0xe4/0x650
[   34.465530]  ? lockdep_init_map+0x3d/0x70
[   34.466093]  ? rcu_read_lock_sched_held+0x108/0x120
[   34.466873]  ? init_timer_key+0x126/0x3b0
[   34.467453]  ? try_to_del_timer_sync+0x120/0x120
[   34.468133]  ? round_jiffies_up+0xce/0x100
[   34.470167]  ? __round_jiffies_up_relative+0x150/0x150
[   34.475418]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   34.480340]  __tun_chr_ioctl+0x1b23/0x3d20
[   34.484558]  ? tun_chr_read_iter+0x1e0/0x1e0
[   34.488952]  ? lock_downgrade+0x990/0x990
[   34.493098]  ? check_same_owner+0x320/0x320
[   34.497398]  ? __handle_mm_fault+0x39c0/0x39c0
[   34.501972]  ? vmacache_find+0x61/0x270
[   34.505927]  ? tun_chr_compat_ioctl+0x30/0x30
[   34.510394]  tun_chr_ioctl+0x2a/0x40
[   34.514081]  ? tun_chr_ioctl+0x2a/0x40
[   34.518032]  do_vfs_ioctl+0x1b1/0x1530
[   34.521903]  ? ioctl_preallocate+0x2b0/0x2b0
[   34.526292]  ? selinux_capable+0x40/0x40
[   34.530345]  ? putname+0xf3/0x130
[   34.533775]  ? do_sys_open+0x320/0x6d0
[   34.537646]  ? security_file_ioctl+0x7d/0xb0
[   34.542025]  ? security_file_ioctl+0x89/0xb0
[   34.546410]  SyS_ioctl+0x8f/0xc0
[   34.549757]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   34.554485] RIP: 0033:0x443d89
[   34.557648] RSP: 002b:00007ffd6ba8dc68 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[   34.565433] RAX: ffffffffffffffda RBX: b6094372c0b880ce RCX: 0000000000443d89
[   34.572675] RDX: 0000000020001fd8 RSI: 00000000400454ca RDI: 0000000000000004
[   34.579928] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   34.587170] R10: 0000000000000000 R11: 0000000000000206 R12: 74656e2f7665642f
[   34.594424] R13: 0000000000401b00 R14: 0000000000000000 R15: 0000000000000000
[   34.601687] 
[   34.603296] Allocated by task 2985:
[   34.606904]  save_stack_trace+0x16/0x20
[   34.610861]  save_stack+0x43/0xd0
[   34.614284]  kasan_kmalloc+0xad/0xe0
[   34.617972]  __kmalloc_node+0x47/0x70
[   34.621834]  kvmalloc_node+0x64/0xd0
[   34.625521]  alloc_netdev_mqs+0x16e/0xed0
[   34.629639]  __tun_chr_ioctl+0x12be/0x3d20
[   34.633854]  tun_chr_ioctl+0x2a/0x40
[   34.637550]  do_vfs_ioctl+0x1b1/0x1530
[   34.641408]  SyS_ioctl+0x8f/0xc0
[   34.644745]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   34.649473] 
[   34.651074] Freed by task 2985:
[   34.654329]  save_stack_trace+0x16/0x20
[   34.658281]  save_stack+0x43/0xd0
[   34.661721]  kasan_slab_free+0x71/0xc0
[   34.665605]  kfree+0xca/0x250
[   34.668693]  kvfree+0x36/0x60
[   34.671772]  free_netdev+0x2cf/0x360
[   34.675474]  __tun_chr_ioctl+0x2cf6/0x3d20
[   34.679681]  tun_chr_ioctl+0x2a/0x40
[   34.683374]  do_vfs_ioctl+0x1b1/0x1530
[   34.687234]  SyS_ioctl+0x8f/0xc0
[   34.690576]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   34.695331] 
[   34.696941] The buggy address belongs to the object at ffff8801ce0502c0
[   34.696941]  which belongs to the cache kmalloc-16384 of size 16384
[   34.709926] The buggy address is located 13320 bytes inside of
[   34.709926]  16384-byte region [ffff8801ce0502c0, ffff8801ce0542c0)
[   34.722143] The buggy address belongs to the page:
[   34.727058] page:ffffea0007381400 count:1 mapcount:0 mapping:ffff8801ce0502c0 index:0x0 compound_mapcount: 0
[   34.737023] flags: 0x200000000008100(slab|head)
[   34.743059] raw: 0200000000008100 ffff8801ce0502c0 0000000000000000 0000000100000001
[   34.750913] raw: ffffea0007556a20 ffffea0007380220 ffff8801dac02200 0000000000000000
[   34.758779] page dumped because: kasan: bad access detected
[   34.764463] 
[   34.766061] Memory state around the buggy address:
[   34.770966]  ffff8801ce053580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.778298]  ffff8801ce053600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.785636] >ffff8801ce053680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.792967]                                               ^
[   34.798668]  ffff8801ce053700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.806012]  ffff8801ce053780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.813341] ==================================================================
[   34.820930] Disabling lock debugging due to kernel taint
[   34.826349] Kernel panic - not syncing: panic_on_warn set ...
[   34.826349] 
[   34.833688] CPU: 0 PID: 2985 Comm: syzkaller030238 Tainted: G    B           4.13.0-next-20170906+ #16
[   34.843098] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.852418] Call Trace:
[   34.854984]  dump_stack+0x194/0x257
[   34.858580]  ? arch_local_irq_restore+0x53/0x53
[   34.863221]  ? vprintk_default+0x28/0x30
[   34.867251]  ? __internal_add_timer+0x1e0/0x2d0
[   34.871975]  panic+0x1e4/0x417
[   34.875134]  ? __warn+0x1d9/0x1d9
[   34.878561]  ? __internal_add_timer+0x275/0x2d0
[   34.883196]  kasan_end_report+0x50/0x50
[   34.887137]  kasan_report+0x137/0x340
[   34.890907]  __asan_report_store8_noabort+0x17/0x20
[   34.895890]  __internal_add_timer+0x275/0x2d0
[   34.900353]  ? calc_wheel_index+0x200/0x200
[   34.904647]  mod_timer+0x622/0x15b0
[   34.908246]  ? mod_timer_pending+0x14e0/0x14e0
[   34.912798]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   34.917781]  ? trace_hardirqs_on+0xd/0x10
[   34.921897]  ? _crng_backtrack_protect+0xd9/0x130
[   34.926709]  ? __lock_is_held+0xbc/0x140
[   34.930765]  ? __lockdep_init_map+0xe4/0x650
[   34.935231]  ? lockdep_init_map+0x3d/0x70
[   34.939347]  ? rcu_read_lock_sched_held+0x108/0x120
[   34.944339]  ? init_timer_key+0x126/0x3b0
[   34.948456]  ? try_to_del_timer_sync+0x120/0x120
[   34.953182]  ? round_jiffies_up+0xce/0x100
[   34.957385]  ? __round_jiffies_up_relative+0x150/0x150
[   34.962628]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   34.967531]  __tun_chr_ioctl+0x1b23/0x3d20
[   34.971739]  ? tun_chr_read_iter+0x1e0/0x1e0
[   34.976124]  ? lock_downgrade+0x990/0x990
[   34.980348]  ? check_same_owner+0x320/0x320
[   34.984638]  ? __handle_mm_fault+0x39c0/0x39c0
[   34.989186]  ? vmacache_find+0x61/0x270
[   34.993145]  ? tun_chr_compat_ioctl+0x30/0x30
[   34.997609]  tun_chr_ioctl+0x2a/0x40
[   35.001289]  ? tun_chr_ioctl+0x2a/0x40
[   35.005149]  do_vfs_ioctl+0x1b1/0x1530
[   35.009051]  ? ioctl_preallocate+0x2b0/0x2b0
[   35.013434]  ? selinux_capable+0x40/0x40
[   35.017462]  ? putname+0xf3/0x130
[   35.020885]  ? do_sys_open+0x320/0x6d0
[   35.024748]  ? security_file_ioctl+0x7d/0xb0
[   35.029122]  ? security_file_ioctl+0x89/0xb0
[   35.033504]  SyS_ioctl+0x8f/0xc0
[   35.036847]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   35.041582] RIP: 0033:0x443d89
[   35.045089] RSP: 002b:00007ffd6ba8dc68 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
[   35.052764] RAX: ffffffffffffffda RBX: b6094372c0b880ce RCX: 0000000000443d89
[   35.060001] RDX: 0000000020001fd8 RSI: 00000000400454ca RDI: 0000000000000004
[   35.067256] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   35.074504] R10: 0000000000000000 R11: 0000000000000206 R12: 74656e2f7665642f
[   35.081760] R13: 0000000000401b00 R14: 0000000000000000 R15: 0000000000000000
[   35.089071] Dumping ftrace buffer:
[   35.092589]    (ftrace buffer empty)
[   35.096452] Kernel Offset: disabled
[   35.100656] Rebooting in 86400 seconds..