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-7,10.128.0.38' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   30.345010] ==================================================================
[   30.346122] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   30.347043] Write of size 8 at addr ffff8801d18e3600 by task syzkaller216083/2988
[   30.348088] 
[   30.348320] CPU: 1 PID: 2988 Comm: syzkaller216083 Not tainted 4.14.0-rc5+ #142
[   30.349293] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.350526] Call Trace:
[   30.350886]  dump_stack+0x194/0x257
[   30.351380]  ? arch_local_irq_restore+0x53/0x53
[   30.352000]  ? show_regs_print_info+0x65/0x65
[   30.352627]  ? __kernel_text_address+0xd/0x40
[   30.353225]  ? __internal_add_timer+0x275/0x2d0
[   30.353847]  print_address_description+0x73/0x250
[   30.354522]  ? __internal_add_timer+0x275/0x2d0
[   30.355142]  kasan_report+0x25b/0x340
[   30.355674]  __asan_report_store8_noabort+0x17/0x20
[   30.356338]  __internal_add_timer+0x275/0x2d0
[   30.356938]  ? calc_wheel_index+0x200/0x200
[   30.357524]  mod_timer+0x622/0x15b0
[   30.358031]  ? mod_timer_pending+0x14e0/0x14e0
[   30.358641]  ? __lock_is_held+0xb6/0x140
[   30.359200]  ? __lock_is_held+0xb6/0x140
[   30.359751]  ? __lockdep_init_map+0xe4/0x650
[   30.360343]  ? lockdep_init_map+0x9/0x10
[   30.360884]  ? init_timer_key+0x126/0x3b0
[   30.361441]  ? try_to_del_timer_sync+0x120/0x120
[   30.362075]  ? round_jiffies_up+0xce/0x100
[   30.362639]  ? __round_jiffies_up_relative+0x150/0x150
[   30.363348]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   30.364029]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   30.364815]  __tun_chr_ioctl+0x1b17/0x3d20
[   30.366926]  ? tun_chr_read_iter+0x1e0/0x1e0
[   30.371297]  ? find_held_lock+0x35/0x1d0
[   30.375337]  ? __do_page_fault+0x64c/0xd60
[   30.379539]  ? lock_downgrade+0x990/0x990
[   30.383661]  ? handle_mm_fault+0x410/0x8d0
[   30.387874]  ? check_same_owner+0x320/0x320
[   30.392158]  ? up_read+0x1a/0x40
[   30.395491]  ? __do_page_fault+0x3d6/0xd60
[   30.399692]  ? tun_chr_compat_ioctl+0x30/0x30
[   30.404152]  tun_chr_ioctl+0x2a/0x40
[   30.407830]  ? tun_chr_ioctl+0x2a/0x40
[   30.411686]  do_vfs_ioctl+0x1b1/0x1520
[   30.415546]  ? ioctl_preallocate+0x2b0/0x2b0
[   30.419925]  ? selinux_capable+0x40/0x40
[   30.423954]  ? putname+0xf3/0x130
[   30.427380]  ? do_sys_open+0x320/0x6d0
[   30.431242]  ? security_file_ioctl+0x89/0xb0
[   30.435623]  SyS_ioctl+0x8f/0xc0
[   30.438962]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   30.443682] RIP: 0033:0x443dc9
[   30.446837] RSP: 002b:00007ffeaa0d1a98 EFLAGS: 00000207 ORIG_RAX: 0000000000000010
[   30.454509] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   30.461743] RDX: 0000000020927fd8 RSI: 00000000400454ca RDI: 0000000000000006
[   30.468977] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   30.476212] R10: 0000000000000000 R11: 0000000000000207 R12: 74510301d31222e1
[   30.483447] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   30.490699] 
[   30.492290] Allocated by task 2988:
[   30.495885]  save_stack_trace+0x16/0x20
[   30.499833]  save_stack+0x43/0xd0
[   30.503257]  kasan_kmalloc+0xad/0xe0
[   30.506935]  __kmalloc_node+0x47/0x70
[   30.510699]  kvmalloc_node+0x64/0xd0
[   30.514378]  alloc_netdev_mqs+0x16e/0xed0
[   30.518489]  __tun_chr_ioctl+0x12b2/0x3d20
[   30.522689]  tun_chr_ioctl+0x2a/0x40
[   30.526369]  do_vfs_ioctl+0x1b1/0x1520
[   30.530221]  SyS_ioctl+0x8f/0xc0
[   30.533552]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   30.538269] 
[   30.539863] Freed by task 2988:
[   30.543109]  save_stack_trace+0x16/0x20
[   30.547047]  save_stack+0x43/0xd0
[   30.550463]  kasan_slab_free+0x71/0xc0
[   30.554313]  kfree+0xca/0x250
[   30.557386]  kvfree+0x36/0x60
[   30.560453]  free_netdev+0x2cf/0x360
[   30.564128]  __tun_chr_ioctl+0x2cea/0x3d20
[   30.568325]  tun_chr_ioctl+0x2a/0x40
[   30.572001]  do_vfs_ioctl+0x1b1/0x1520
[   30.575852]  SyS_ioctl+0x8f/0xc0
[   30.579182]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   30.583898] 
[   30.585491] The buggy address belongs to the object at ffff8801d18e02c0
[   30.585491]  which belongs to the cache kmalloc-16384 of size 16384
[   30.598455] The buggy address is located 13120 bytes inside of
[   30.598455]  16384-byte region [ffff8801d18e02c0, ffff8801d18e42c0)
[   30.610647] The buggy address belongs to the page:
[   30.615552] page:ffffea0007463800 count:1 mapcount:0 mapping:ffff8801d18e02c0 index:0x0 compound_mapcount: 0
[   30.625484] flags: 0x200000000008100(slab|head)
[   30.630121] raw: 0200000000008100 ffff8801d18e02c0 0000000000000000 0000000100000001
[   30.637965] raw: ffffea0007653420 ffffea000747ee20 ffff8801dac02200 0000000000000000
[   30.645806] page dumped because: kasan: bad access detected
[   30.651479] 
[   30.653073] Memory state around the buggy address:
[   30.657965]  ffff8801d18e3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   30.665288]  ffff8801d18e3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   30.672608] >ffff8801d18e3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   30.680366]                    ^
[   30.683697]  ffff8801d18e3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   30.691018]  ffff8801d18e3700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   30.698336] ==================================================================
[   30.705659] Disabling lock debugging due to kernel taint
[   30.711076] Kernel panic - not syncing: panic_on_warn set ...
[   30.711076] 
[   30.718400] CPU: 1 PID: 2988 Comm: syzkaller216083 Tainted: G    B           4.14.0-rc5+ #142
[   30.727023] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   30.736345] Call Trace:
[   30.738900]  dump_stack+0x194/0x257
[   30.742495]  ? arch_local_irq_restore+0x53/0x53
[   30.747125]  ? kasan_end_report+0x32/0x50
[   30.751239]  ? lock_downgrade+0x990/0x990
[   30.755358]  ? __internal_add_timer+0x1f0/0x2d0
[   30.759991]  panic+0x1e4/0x417
[   30.763147]  ? __warn+0x1d9/0x1d9
[   30.766569]  ? __internal_add_timer+0x275/0x2d0
[   30.771200]  kasan_end_report+0x50/0x50
[   30.775135]  kasan_report+0x144/0x340
[   30.778900]  __asan_report_store8_noabort+0x17/0x20
[   30.783879]  __internal_add_timer+0x275/0x2d0
[   30.788341]  ? calc_wheel_index+0x200/0x200
[   30.792630]  mod_timer+0x622/0x15b0
[   30.796224]  ? mod_timer_pending+0x14e0/0x14e0
[   30.800771]  ? __lock_is_held+0xb6/0x140
[   30.804802]  ? __lock_is_held+0xb6/0x140
[   30.808828]  ? __lockdep_init_map+0xe4/0x650
[   30.813203]  ? lockdep_init_map+0x9/0x10
[   30.817226]  ? init_timer_key+0x126/0x3b0
[   30.821341]  ? try_to_del_timer_sync+0x120/0x120
[   30.826062]  ? round_jiffies_up+0xce/0x100
[   30.830258]  ? __round_jiffies_up_relative+0x150/0x150
[   30.835498]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   30.840392]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   30.845895]  __tun_chr_ioctl+0x1b17/0x3d20
[   30.850097]  ? tun_chr_read_iter+0x1e0/0x1e0
[   30.854469]  ? find_held_lock+0x35/0x1d0
[   30.858498]  ? __do_page_fault+0x64c/0xd60
[   30.862696]  ? lock_downgrade+0x990/0x990
[   30.866812]  ? handle_mm_fault+0x410/0x8d0
[   30.871016]  ? check_same_owner+0x320/0x320
[   30.875300]  ? up_read+0x1a/0x40
[   30.878632]  ? __do_page_fault+0x3d6/0xd60
[   30.882832]  ? tun_chr_compat_ioctl+0x30/0x30
[   30.887289]  tun_chr_ioctl+0x2a/0x40
[   30.890964]  ? tun_chr_ioctl+0x2a/0x40
[   30.894815]  do_vfs_ioctl+0x1b1/0x1520
[   30.898669]  ? ioctl_preallocate+0x2b0/0x2b0
[   30.903042]  ? selinux_capable+0x40/0x40
[   30.907066]  ? putname+0xf3/0x130
[   30.910485]  ? do_sys_open+0x320/0x6d0
[   30.914343]  ? security_file_ioctl+0x89/0xb0
[   30.918715]  SyS_ioctl+0x8f/0xc0
[   30.922050]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   30.926769] RIP: 0033:0x443dc9
[   30.929922] RSP: 002b:00007ffeaa0d1a98 EFLAGS: 00000207 ORIG_RAX: 0000000000000010
[   30.937591] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   30.944825] RDX: 0000000020927fd8 RSI: 00000000400454ca RDI: 0000000000000006
[   30.952057] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   30.959291] R10: 0000000000000000 R11: 0000000000000207 R12: 74510301d31222e1
[   30.966527] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   30.973805] Dumping ftrace buffer:
[   30.977312]    (ftrace buffer empty)
[   30.980988] Kernel Offset: disabled
[   30.984582] Rebooting in 86400 seconds..