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-386-3,10.128.0.35' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   46.919473] ==================================================================
[   46.920614] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   46.921557] Write of size 8 at addr ffff8801d228b600 by task syzkaller952077/2985
[   46.922553] 
[   46.922801] CPU: 1 PID: 2985 Comm: syzkaller952077 Not tainted 4.14.0-rc5+ #48
[   46.923765] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   46.924983] Call Trace:
[   46.925339]  dump_stack+0x194/0x257
[   46.925832]  ? arch_local_irq_restore+0x53/0x53
[   46.926454]  ? show_regs_print_info+0x65/0x65
[   46.927094]  ? __kernel_text_address+0xd/0x40
[   46.927710]  ? __internal_add_timer+0x275/0x2d0
[   46.928333]  print_address_description+0x73/0x250
[   46.928995]  ? __internal_add_timer+0x275/0x2d0
[   46.929617]  kasan_report+0x25b/0x340
[   46.930131]  __asan_report_store8_noabort+0x17/0x20
[   46.930823]  __internal_add_timer+0x275/0x2d0
[   46.931443]  ? calc_wheel_index+0x200/0x200
[   46.932086]  mod_timer+0x622/0x15b0
[   46.932583]  ? mod_timer_pending+0x14e0/0x14e0
[   46.933236]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   46.933956]  ? trace_hardirqs_on+0xd/0x10
[   46.934518]  ? _crng_backtrack_protect+0xd9/0x130
[   46.935168]  ? __lock_is_held+0xb6/0x140
[   46.935720]  ? __lockdep_init_map+0xe4/0x650
[   46.936347]  ? lockdep_init_map+0x9/0x10
[   46.936892]  ? init_timer_key+0x126/0x3b0
[   46.937450]  ? try_to_del_timer_sync+0x120/0x120
[   46.938088]  ? round_jiffies_up+0xce/0x100
[   46.938657]  ? __round_jiffies_up_relative+0x150/0x150
[   46.939359]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   46.942541]  __tun_chr_ioctl+0x1b17/0x3d20
[   46.946753]  ? tun_chr_read_iter+0x1e0/0x1e0
[   46.951125]  ? find_held_lock+0x35/0x1d0
[   46.955161]  ? __might_sleep+0x95/0x190
[   46.959099]  ? handle_mm_fault+0x248/0x8d0
[   46.963307]  ? selinux_file_ioctl+0x444/0x690
[   46.967767]  ? __fget_light+0x297/0x380
[   46.971710]  ? selinux_capable+0x40/0x40
[   46.975747]  ? handle_mm_fault+0x410/0x8d0
[   46.979959]  tun_chr_compat_ioctl+0x29/0x30
[   46.984947]  ? tun_chr_compat_ioctl+0x29/0x30
[   46.989413]  compat_SyS_ioctl+0x1d7/0x3290
[   46.993614]  ? up_read+0x1a/0x40
[   46.996946]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   47.001321]  ? do_ioctl+0x60/0x60
[   47.004743]  ? do_fast_syscall_32+0x158/0xf05
[   47.009208]  ? do_ioctl+0x60/0x60
[   47.012628]  do_fast_syscall_32+0x3f2/0xf05
[   47.016923]  ? do_int80_syscall_32+0x940/0x940
[   47.021470]  ? kasan_check_read+0x11/0x20
[   47.025587]  ? syscall_return_slowpath+0x510/0x510
[   47.030485]  ? SyS_rt_sigaction+0x94/0x1b0
[   47.034691]  ? SyS_sigprocmask+0x4b0/0x4b0
[   47.038891]  ? SyS_read+0x184/0x220
[   47.042486]  ? retint_user+0x18/0x20
[   47.046189]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.051007]  entry_SYSENTER_compat+0x51/0x60
[   47.055380] RIP: 0023:0xf7f53c79
[   47.058712] RSP: 002b:00000000ff86078c EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   47.066386] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   47.073620] RDX: 0000000020fc3fd8 RSI: 0000000000000029 RDI: 0000000000000005
[   47.080854] RBP: 00000000ff8607e8 R08: 0000000000000000 R09: 0000000000000000
[   47.088089] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   47.095324] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   47.102578] 
[   47.104172] Allocated by task 2985:
[   47.107767]  save_stack_trace+0x16/0x20
[   47.111707]  save_stack+0x43/0xd0
[   47.115126]  kasan_kmalloc+0xad/0xe0
[   47.118804]  __kmalloc_node+0x47/0x70
[   47.122569]  kvmalloc_node+0x64/0xd0
[   47.126250]  alloc_netdev_mqs+0x16e/0xed0
[   47.130360]  __tun_chr_ioctl+0x12b2/0x3d20
[   47.134560]  tun_chr_compat_ioctl+0x29/0x30
[   47.138846]  compat_SyS_ioctl+0x1d7/0x3290
[   47.143043]  do_fast_syscall_32+0x3f2/0xf05
[   47.147330]  entry_SYSENTER_compat+0x51/0x60
[   47.151708] 
[   47.153310] Freed by task 2985:
[   47.156563]  save_stack_trace+0x16/0x20
[   47.160502]  save_stack+0x43/0xd0
[   47.163920]  kasan_slab_free+0x71/0xc0
[   47.167772]  kfree+0xca/0x250
[   47.170842]  kvfree+0x36/0x60
[   47.173913]  free_netdev+0x2cf/0x360
[   47.177589]  __tun_chr_ioctl+0x2cea/0x3d20
[   47.181786]  tun_chr_compat_ioctl+0x29/0x30
[   47.186072]  compat_SyS_ioctl+0x1d7/0x3290
[   47.190271]  do_fast_syscall_32+0x3f2/0xf05
[   47.194561]  entry_SYSENTER_compat+0x51/0x60
[   47.198930] 
[   47.200525] The buggy address belongs to the object at ffff8801d22882c0
[   47.200525]  which belongs to the cache kmalloc-16384 of size 16384
[   47.213494] The buggy address is located 13120 bytes inside of
[   47.213494]  16384-byte region [ffff8801d22882c0, ffff8801d228c2c0)
[   47.225677] The buggy address belongs to the page:
[   47.230571] page:ffffea000748a200 count:1 mapcount:0 mapping:ffff8801d22882c0 index:0x0 compound_mapcount: 0
[   47.240503] flags: 0x200000000008100(slab|head)
[   47.245136] raw: 0200000000008100 ffff8801d22882c0 0000000000000000 0000000100000001
[   47.253090] raw: ffffea0007656020 ffffea000747fa20 ffff8801dac02200 0000000000000000
[   47.260932] page dumped because: kasan: bad access detected
[   47.266605] 
[   47.268199] Memory state around the buggy address:
[   47.273092]  ffff8801d228b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   47.280418]  ffff8801d228b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   47.287741] >ffff8801d228b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   47.295062]                    ^
[   47.298391]  ffff8801d228b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   47.305713]  ffff8801d228b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   47.313035] ==================================================================
[   47.320355] Disabling lock debugging due to kernel taint
[   47.325770] Kernel panic - not syncing: panic_on_warn set ...
[   47.325770] 
[   47.333097] CPU: 1 PID: 2985 Comm: syzkaller952077 Tainted: G    B           4.14.0-rc5+ #48
[   47.341634] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   47.350950] Call Trace:
[   47.353507]  dump_stack+0x194/0x257
[   47.357101]  ? arch_local_irq_restore+0x53/0x53
[   47.361733]  ? kasan_end_report+0x32/0x50
[   47.365845]  ? lock_downgrade+0x990/0x990
[   47.369957]  ? __internal_add_timer+0x1c0/0x2d0
[   47.374592]  panic+0x1e4/0x417
[   47.377749]  ? __warn+0x1d9/0x1d9
[   47.381172]  ? __internal_add_timer+0x275/0x2d0
[   47.385805]  kasan_end_report+0x50/0x50
[   47.389741]  kasan_report+0x144/0x340
[   47.393508]  __asan_report_store8_noabort+0x17/0x20
[   47.398487]  __internal_add_timer+0x275/0x2d0
[   47.402945]  ? calc_wheel_index+0x200/0x200
[   47.407234]  mod_timer+0x622/0x15b0
[   47.410828]  ? mod_timer_pending+0x14e0/0x14e0
[   47.415374]  ? trace_hardirqs_on_caller+0x421/0x5c0
[   47.420355]  ? trace_hardirqs_on+0xd/0x10
[   47.424471]  ? _crng_backtrack_protect+0xd9/0x130
[   47.429281]  ? __lock_is_held+0xb6/0x140
[   47.433307]  ? __lockdep_init_map+0xe4/0x650
[   47.437682]  ? lockdep_init_map+0x9/0x10
[   47.441706]  ? init_timer_key+0x126/0x3b0
[   47.445818]  ? try_to_del_timer_sync+0x120/0x120
[   47.450538]  ? round_jiffies_up+0xce/0x100
[   47.454739]  ? __round_jiffies_up_relative+0x150/0x150
[   47.459980]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   47.464876]  __tun_chr_ioctl+0x1b17/0x3d20
[   47.469079]  ? tun_chr_read_iter+0x1e0/0x1e0
[   47.473453]  ? find_held_lock+0x35/0x1d0
[   47.477658]  ? __might_sleep+0x95/0x190
[   47.481597]  ? handle_mm_fault+0x248/0x8d0
[   47.485802]  ? selinux_file_ioctl+0x444/0x690
[   47.490260]  ? __fget_light+0x297/0x380
[   47.494198]  ? selinux_capable+0x40/0x40
[   47.498226]  ? handle_mm_fault+0x410/0x8d0
[   47.502426]  tun_chr_compat_ioctl+0x29/0x30
[   47.506712]  ? tun_chr_compat_ioctl+0x29/0x30
[   47.511172]  compat_SyS_ioctl+0x1d7/0x3290
[   47.515369]  ? up_read+0x1a/0x40
[   47.518702]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   47.523074]  ? do_ioctl+0x60/0x60
[   47.526492]  ? do_fast_syscall_32+0x158/0xf05
[   47.530953]  ? do_ioctl+0x60/0x60
[   47.534370]  do_fast_syscall_32+0x3f2/0xf05
[   47.538667]  ? do_int80_syscall_32+0x940/0x940
[   47.543213]  ? kasan_check_read+0x11/0x20
[   47.547326]  ? syscall_return_slowpath+0x510/0x510
[   47.552219]  ? SyS_rt_sigaction+0x94/0x1b0
[   47.556418]  ? SyS_sigprocmask+0x4b0/0x4b0
[   47.560617]  ? SyS_read+0x184/0x220
[   47.564213]  ? retint_user+0x18/0x20
[   47.567891]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   47.572703]  entry_SYSENTER_compat+0x51/0x60
[   47.577083] RIP: 0023:0xf7f53c79
[   47.580411] RSP: 002b:00000000ff86078c EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   47.588083] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   47.595665] RDX: 0000000020fc3fd8 RSI: 0000000000000029 RDI: 0000000000000005
[   47.602900] RBP: 00000000ff8607e8 R08: 0000000000000000 R09: 0000000000000000
[   47.610135] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   47.617368] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   47.624645] Dumping ftrace buffer:
[   47.628150]    (ftrace buffer empty)
[   47.631829] Kernel Offset: disabled
[   47.635421] Rebooting in 86400 seconds..