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-386-0,10.128.0.61' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   32.016817] ==================================================================
[   32.017951] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   32.018890] Write of size 8 at addr ffff8801d1cc3600 by task syzkaller413489/2991
[   32.019888] 
[   32.020121] CPU: 0 PID: 2991 Comm: syzkaller413489 Not tainted 4.14.0-rc5+ #50
[   32.021096] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.022315] Call Trace:
[   32.022676]  dump_stack+0x194/0x257
[   32.023167]  ? arch_local_irq_restore+0x53/0x53
[   32.023807]  ? show_regs_print_info+0x65/0x65
[   32.024484]  ? __kernel_text_address+0xd/0x40
[   32.025083]  ? __internal_add_timer+0x275/0x2d0
[   32.025707]  print_address_description+0x73/0x250
[   32.026352]  ? __internal_add_timer+0x275/0x2d0
[   32.026975]  kasan_report+0x25b/0x340
[   32.027489]  __asan_report_store8_noabort+0x17/0x20
[   32.028167]  __internal_add_timer+0x275/0x2d0
[   32.028768]  ? calc_wheel_index+0x200/0x200
[   32.029356]  mod_timer+0x622/0x15b0
[   32.029854]  ? mod_timer_pending+0x14e0/0x14e0
[   32.030467]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   32.031152]  ? trace_hardirqs_on+0xd/0x10
[   32.031712]  ? _crng_backtrack_protect+0xd9/0x130
[   32.032363]  ? __lock_is_held+0xb6/0x140
[   32.032912]  ? __lockdep_init_map+0xe4/0x650
[   32.033521]  ? lockdep_init_map+0x9/0x10
[   32.034081]  ? init_timer_key+0x126/0x3b0
[   32.034639]  ? try_to_del_timer_sync+0x120/0x120
[   32.035275]  ? round_jiffies_up+0xce/0x100
[   32.035841]  ? __round_jiffies_up_relative+0x150/0x150
[   32.036542]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   32.038514]  __tun_chr_ioctl+0x1b17/0x3d20
[   32.042726]  ? tun_chr_read_iter+0x1e0/0x1e0
[   32.047102]  ? find_held_lock+0x35/0x1d0
[   32.051140]  ? __might_sleep+0x95/0x190
[   32.055080]  ? handle_mm_fault+0x248/0x8d0
[   32.059292]  ? selinux_file_ioctl+0x444/0x690
[   32.063755]  ? __fget_light+0x297/0x380
[   32.067698]  ? selinux_capable+0x40/0x40
[   32.071738]  ? handle_mm_fault+0x410/0x8d0
[   32.075946]  tun_chr_compat_ioctl+0x29/0x30
[   32.080233]  ? tun_chr_compat_ioctl+0x29/0x30
[   32.084698]  compat_SyS_ioctl+0x1d7/0x3290
[   32.088897]  ? up_read+0x1a/0x40
[   32.092232]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   32.096609]  ? do_ioctl+0x60/0x60
[   32.100035]  ? do_fast_syscall_32+0x158/0xf05
[   32.104499]  ? do_ioctl+0x60/0x60
[   32.107922]  do_fast_syscall_32+0x3f2/0xf05
[   32.112217]  ? do_int80_syscall_32+0x940/0x940
[   32.116767]  ? kasan_check_read+0x11/0x20
[   32.120884]  ? syscall_return_slowpath+0x510/0x510
[   32.125782]  ? SyS_rt_sigaction+0x94/0x1b0
[   32.129993]  ? SyS_sigprocmask+0x4b0/0x4b0
[   32.134194]  ? SyS_read+0x184/0x220
[   32.137789]  ? retint_user+0x18/0x20
[   32.141474]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.146289]  entry_SYSENTER_compat+0x51/0x60
[   32.150664] RIP: 0023:0xf7fbfc79
[   32.153994] RSP: 002b:00000000ffbcc17c EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   32.161670] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   32.168905] RDX: 00000000206b2fd8 RSI: 0000000000000037 RDI: 0000000000000005
[   32.176140] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   32.183377] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   32.190613] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   32.197865] 
[   32.199460] Allocated by task 2991:
[   32.203058]  save_stack_trace+0x16/0x20
[   32.206999]  save_stack+0x43/0xd0
[   32.210419]  kasan_kmalloc+0xad/0xe0
[   32.214097]  __kmalloc_node+0x47/0x70
[   32.217864]  kvmalloc_node+0x64/0xd0
[   32.221545]  alloc_netdev_mqs+0x16e/0xed0
[   32.225659]  __tun_chr_ioctl+0x12b2/0x3d20
[   32.229857]  tun_chr_compat_ioctl+0x29/0x30
[   32.234144]  compat_SyS_ioctl+0x1d7/0x3290
[   32.238345]  do_fast_syscall_32+0x3f2/0xf05
[   32.242634]  entry_SYSENTER_compat+0x51/0x60
[   32.247005] 
[   32.248598] Freed by task 2991:
[   32.251843]  save_stack_trace+0x16/0x20
[   32.255781]  save_stack+0x43/0xd0
[   32.259199]  kasan_slab_free+0x71/0xc0
[   32.263051]  kfree+0xca/0x250
[   32.266120]  kvfree+0x36/0x60
[   32.269191]  free_netdev+0x2cf/0x360
[   32.272867]  __tun_chr_ioctl+0x2cea/0x3d20
[   32.277068]  tun_chr_compat_ioctl+0x29/0x30
[   32.281356]  compat_SyS_ioctl+0x1d7/0x3290
[   32.285556]  do_fast_syscall_32+0x3f2/0xf05
[   32.289844]  entry_SYSENTER_compat+0x51/0x60
[   32.294214] 
[   32.295809] The buggy address belongs to the object at ffff8801d1cc02c0
[   32.295809]  which belongs to the cache kmalloc-16384 of size 16384
[   32.308775] The buggy address is located 13120 bytes inside of
[   32.308775]  16384-byte region [ffff8801d1cc02c0, ffff8801d1cc42c0)
[   32.320957] The buggy address belongs to the page:
[   32.325853] page:ffffea0007473000 count:1 mapcount:0 mapping:ffff8801d1cc02c0 index:0x0 compound_mapcount: 0
[   32.335787] flags: 0x200000000008100(slab|head)
[   32.340423] raw: 0200000000008100 ffff8801d1cc02c0 0000000000000000 0000000100000001
[   32.348270] raw: ffffea000701a620 ffffea000748aa20 ffff8801dac02200 0000000000000000
[   32.356114] page dumped because: kasan: bad access detected
[   32.361786] 
[   32.363378] Memory state around the buggy address:
[   32.368272]  ffff8801d1cc3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.375597]  ffff8801d1cc3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.382921] >ffff8801d1cc3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.390243]                    ^
[   32.393573]  ffff8801d1cc3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.400895]  ffff8801d1cc3700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.408216] ==================================================================
[   32.415538] Disabling lock debugging due to kernel taint
[   32.420954] Kernel panic - not syncing: panic_on_warn set ...
[   32.420954] 
[   32.428283] CPU: 0 PID: 2991 Comm: syzkaller413489 Tainted: G    B           4.14.0-rc5+ #50
[   32.436818] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.446134] Call Trace:
[   32.448692]  dump_stack+0x194/0x257
[   32.452286]  ? arch_local_irq_restore+0x53/0x53
[   32.456919]  ? kasan_end_report+0x32/0x50
[   32.461034]  ? lock_downgrade+0x990/0x990
[   32.465148]  ? __internal_add_timer+0x1d0/0x2d0
[   32.469782]  panic+0x1e4/0x417
[   32.472939]  ? __warn+0x1d9/0x1d9
[   32.476369]  ? __internal_add_timer+0x275/0x2d0
[   32.481003]  kasan_end_report+0x50/0x50
[   32.484941]  kasan_report+0x144/0x340
[   32.488711]  __asan_report_store8_noabort+0x17/0x20
[   32.493689]  __internal_add_timer+0x275/0x2d0
[   32.498151]  ? calc_wheel_index+0x200/0x200
[   32.502443]  mod_timer+0x622/0x15b0
[   32.506040]  ? mod_timer_pending+0x14e0/0x14e0
[   32.510586]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   32.515567]  ? trace_hardirqs_on+0xd/0x10
[   32.519681]  ? _crng_backtrack_protect+0xd9/0x130
[   32.524492]  ? __lock_is_held+0xb6/0x140
[   32.528520]  ? __lockdep_init_map+0xe4/0x650
[   32.532894]  ? lockdep_init_map+0x9/0x10
[   32.536917]  ? init_timer_key+0x126/0x3b0
[   32.541030]  ? try_to_del_timer_sync+0x120/0x120
[   32.545750]  ? round_jiffies_up+0xce/0x100
[   32.549952]  ? __round_jiffies_up_relative+0x150/0x150
[   32.555194]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   32.560092]  __tun_chr_ioctl+0x1b17/0x3d20
[   32.564297]  ? tun_chr_read_iter+0x1e0/0x1e0
[   32.568668]  ? find_held_lock+0x35/0x1d0
[   32.572699]  ? __might_sleep+0x95/0x190
[   32.576636]  ? handle_mm_fault+0x248/0x8d0
[   32.580841]  ? selinux_file_ioctl+0x444/0x690
[   32.585302]  ? __fget_light+0x297/0x380
[   32.589239]  ? selinux_capable+0x40/0x40
[   32.593268]  ? handle_mm_fault+0x410/0x8d0
[   32.597470]  tun_chr_compat_ioctl+0x29/0x30
[   32.601754]  ? tun_chr_compat_ioctl+0x29/0x30
[   32.606215]  compat_SyS_ioctl+0x1d7/0x3290
[   32.610412]  ? up_read+0x1a/0x40
[   32.613743]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   32.618115]  ? do_ioctl+0x60/0x60
[   32.621536]  ? do_fast_syscall_32+0x158/0xf05
[   32.625997]  ? do_ioctl+0x60/0x60
[   32.629415]  do_fast_syscall_32+0x3f2/0xf05
[   32.633703]  ? do_int80_syscall_32+0x940/0x940
[   32.638250]  ? kasan_check_read+0x11/0x20
[   32.642364]  ? syscall_return_slowpath+0x510/0x510
[   32.647260]  ? SyS_rt_sigaction+0x94/0x1b0
[   32.651460]  ? SyS_sigprocmask+0x4b0/0x4b0
[   32.655661]  ? SyS_read+0x184/0x220
[   32.659253]  ? retint_user+0x18/0x20
[   32.662933]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   32.667752]  entry_SYSENTER_compat+0x51/0x60
[   32.672126] RIP: 0023:0xf7fbfc79
[   32.675453] RSP: 002b:00000000ffbcc17c EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   32.683126] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   32.690359] RDX: 00000000206b2fd8 RSI: 0000000000000037 RDI: 0000000000000005
[   32.697594] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   32.704829] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   32.712062] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   32.719652] Dumping ftrace buffer:
[   32.723157]    (ftrace buffer empty)
[   32.726831] Kernel Offset: disabled
[   32.730424] Rebooting in 86400 seconds..