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-386-4,10.128.15.233' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   44.174358] ==================================================================
[   44.175458] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   44.176380] Write of size 8 at addr ffff8801d1cd3600 by task syzkaller535947/2989
[   44.177374] 
[   44.177605] CPU: 1 PID: 2989 Comm: syzkaller535947 Not tainted 4.14.0-rc5+ #52
[   44.178571] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.179789] Call Trace:
[   44.180145]  dump_stack+0x194/0x257
[   44.180637]  ? arch_local_irq_restore+0x53/0x53
[   44.181259]  ? show_regs_print_info+0x65/0x65
[   44.181863]  ? __kernel_text_address+0xd/0x40
[   44.182464]  ? __internal_add_timer+0x275/0x2d0
[   44.183086]  print_address_description+0x73/0x250
[   44.183758]  ? __internal_add_timer+0x275/0x2d0
[   44.184382]  kasan_report+0x25b/0x340
[   44.184897]  __asan_report_store8_noabort+0x17/0x20
[   44.185561]  __internal_add_timer+0x275/0x2d0
[   44.186174]  ? calc_wheel_index+0x200/0x200
[   44.186760]  mod_timer+0x622/0x15b0
[   44.187256]  ? mod_timer_pending+0x14e0/0x14e0
[   44.187867]  ? __lock_is_held+0xb6/0x140
[   44.188423]  ? __lock_is_held+0xb6/0x140
[   44.188972]  ? __lockdep_init_map+0xe4/0x650
[   44.189562]  ? lockdep_init_map+0x9/0x10
[   44.190107]  ? init_timer_key+0x126/0x3b0
[   44.190663]  ? try_to_del_timer_sync+0x120/0x120
[   44.191322]  ? round_jiffies_up+0xce/0x100
[   44.191939]  ? __round_jiffies_up_relative+0x150/0x150
[   44.192655]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   44.193310]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   44.194062]  __tun_chr_ioctl+0x1b17/0x3d20
[   44.194640]  ? tun_chr_read_iter+0x1e0/0x1e0
[   44.199013]  ? find_held_lock+0x35/0x1d0
[   44.203047]  ? __might_sleep+0x95/0x190
[   44.206985]  ? handle_mm_fault+0x248/0x8d0
[   44.211192]  ? selinux_file_ioctl+0x444/0x690
[   44.215651]  ? __fget_light+0x297/0x380
[   44.219590]  ? selinux_capable+0x40/0x40
[   44.223629]  ? handle_mm_fault+0x410/0x8d0
[   44.227835]  tun_chr_compat_ioctl+0x29/0x30
[   44.232122]  ? tun_chr_compat_ioctl+0x29/0x30
[   44.236584]  compat_SyS_ioctl+0x1d7/0x3290
[   44.240785]  ? up_read+0x1a/0x40
[   44.244119]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   44.248495]  ? do_ioctl+0x60/0x60
[   44.251918]  ? do_fast_syscall_32+0x158/0xf05
[   44.256382]  ? do_ioctl+0x60/0x60
[   44.259802]  do_fast_syscall_32+0x3f2/0xf05
[   44.264095]  ? do_int80_syscall_32+0x940/0x940
[   44.268644]  ? kasan_check_read+0x11/0x20
[   44.272758]  ? syscall_return_slowpath+0x510/0x510
[   44.277655]  ? SyS_rt_sigaction+0x94/0x1b0
[   44.281855]  ? SyS_sigprocmask+0x4b0/0x4b0
[   44.286054]  ? SyS_read+0x184/0x220
[   44.289647]  ? retint_user+0x18/0x20
[   44.293330]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   44.298144]  entry_SYSENTER_compat+0x51/0x60
[   44.302516] RIP: 0023:0xf7f14c79
[   44.305844] RSP: 002b:00000000ffc340cc EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   44.313517] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   44.320751] RDX: 0000000020927fd8 RSI: 0000000000000037 RDI: 0000000000000005
[   44.327985] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   44.335219] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   44.342452] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   44.349704] 
[   44.351297] Allocated by task 2989:
[   44.354891]  save_stack_trace+0x16/0x20
[   44.358826]  save_stack+0x43/0xd0
[   44.362243]  kasan_kmalloc+0xad/0xe0
[   44.365919]  __kmalloc_node+0x47/0x70
[   44.369683]  kvmalloc_node+0x64/0xd0
[   44.373360]  alloc_netdev_mqs+0x16e/0xed0
[   44.377474]  __tun_chr_ioctl+0x12b2/0x3d20
[   44.381671]  tun_chr_compat_ioctl+0x29/0x30
[   44.385955]  compat_SyS_ioctl+0x1d7/0x3290
[   44.390153]  do_fast_syscall_32+0x3f2/0xf05
[   44.394438]  entry_SYSENTER_compat+0x51/0x60
[   44.398808] 
[   44.400400] Freed by task 2989:
[   44.403642]  save_stack_trace+0x16/0x20
[   44.407582]  save_stack+0x43/0xd0
[   44.410998]  kasan_slab_free+0x71/0xc0
[   44.414851]  kfree+0xca/0x250
[   44.417921]  kvfree+0x36/0x60
[   44.420989]  free_netdev+0x2cf/0x360
[   44.424668]  __tun_chr_ioctl+0x2cea/0x3d20
[   44.428865]  tun_chr_compat_ioctl+0x29/0x30
[   44.433150]  compat_SyS_ioctl+0x1d7/0x3290
[   44.437349]  do_fast_syscall_32+0x3f2/0xf05
[   44.441632]  entry_SYSENTER_compat+0x51/0x60
[   44.446000] 
[   44.447592] The buggy address belongs to the object at ffff8801d1cd02c0
[   44.447592]  which belongs to the cache kmalloc-16384 of size 16384
[   44.460559] The buggy address is located 13120 bytes inside of
[   44.460559]  16384-byte region [ffff8801d1cd02c0, ffff8801d1cd42c0)
[   44.472743] The buggy address belongs to the page:
[   44.477638] page:ffffea0007473400 count:1 mapcount:0 mapping:ffff8801d1cd02c0 index:0x0 compound_mapcount: 0
[   44.487568] flags: 0x200000000008100(slab|head)
[   44.492203] raw: 0200000000008100 ffff8801d1cd02c0 0000000000000000 0000000100000001
[   44.500049] raw: ffffea000701e020 ffffea0007462820 ffff8801dac02200 0000000000000000
[   44.507890] page dumped because: kasan: bad access detected
[   44.513559] 
[   44.515149] Memory state around the buggy address:
[   44.520041]  ffff8801d1cd3500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.527362]  ffff8801d1cd3580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.534685] >ffff8801d1cd3600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.542005]                    ^
[   44.545335]  ffff8801d1cd3680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.552659]  ffff8801d1cd3700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   44.559979] ==================================================================
[   44.567298] Disabling lock debugging due to kernel taint
[   44.572708] Kernel panic - not syncing: panic_on_warn set ...
[   44.572708] 
[   44.580035] CPU: 1 PID: 2989 Comm: syzkaller535947 Tainted: G    B           4.14.0-rc5+ #52
[   44.588572] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   44.597888] Call Trace:
[   44.600440]  dump_stack+0x194/0x257
[   44.604031]  ? arch_local_irq_restore+0x53/0x53
[   44.608664]  ? kasan_end_report+0x32/0x50
[   44.612777]  ? lock_downgrade+0x990/0x990
[   44.616889]  ? __internal_add_timer+0x1f0/0x2d0
[   44.621521]  panic+0x1e4/0x417
[   44.624676]  ? __warn+0x1d9/0x1d9
[   44.628097]  ? __internal_add_timer+0x275/0x2d0
[   44.632726]  kasan_end_report+0x50/0x50
[   44.636664]  kasan_report+0x144/0x340
[   44.640429]  __asan_report_store8_noabort+0x17/0x20
[   44.645405]  __internal_add_timer+0x275/0x2d0
[   44.649862]  ? calc_wheel_index+0x200/0x200
[   44.654153]  mod_timer+0x622/0x15b0
[   44.657747]  ? mod_timer_pending+0x14e0/0x14e0
[   44.662293]  ? __lock_is_held+0xb6/0x140
[   44.666322]  ? __lock_is_held+0xb6/0x140
[   44.670351]  ? __lockdep_init_map+0xe4/0x650
[   44.674723]  ? lockdep_init_map+0x9/0x10
[   44.678746]  ? init_timer_key+0x126/0x3b0
[   44.682857]  ? try_to_del_timer_sync+0x120/0x120
[   44.687578]  ? round_jiffies_up+0xce/0x100
[   44.691775]  ? __round_jiffies_up_relative+0x150/0x150
[   44.697013]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   44.701905]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   44.707408]  __tun_chr_ioctl+0x1b17/0x3d20
[   44.711612]  ? tun_chr_read_iter+0x1e0/0x1e0
[   44.715981]  ? find_held_lock+0x35/0x1d0
[   44.720008]  ? __might_sleep+0x95/0x190
[   44.723943]  ? handle_mm_fault+0x248/0x8d0
[   44.728144]  ? selinux_file_ioctl+0x444/0x690
[   44.732601]  ? __fget_light+0x297/0x380
[   44.736548]  ? selinux_capable+0x40/0x40
[   44.741048]  ? handle_mm_fault+0x410/0x8d0
[   44.745255]  tun_chr_compat_ioctl+0x29/0x30
[   44.749539]  ? tun_chr_compat_ioctl+0x29/0x30
[   44.753999]  compat_SyS_ioctl+0x1d7/0x3290
[   44.758195]  ? up_read+0x1a/0x40
[   44.761525]  ? __tun_chr_ioctl+0x3d20/0x3d20
[   44.765895]  ? do_ioctl+0x60/0x60
[   44.769316]  ? do_fast_syscall_32+0x158/0xf05
[   44.773773]  ? do_ioctl+0x60/0x60
[   44.777188]  do_fast_syscall_32+0x3f2/0xf05
[   44.781476]  ? do_int80_syscall_32+0x940/0x940
[   44.786020]  ? kasan_check_read+0x11/0x20
[   44.790132]  ? syscall_return_slowpath+0x510/0x510
[   44.795028]  ? SyS_rt_sigaction+0x94/0x1b0
[   44.799226]  ? SyS_sigprocmask+0x4b0/0x4b0
[   44.803427]  ? SyS_read+0x184/0x220
[   44.807019]  ? retint_user+0x18/0x20
[   44.810699]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[   44.815507]  entry_SYSENTER_compat+0x51/0x60
[   44.819876] RIP: 0023:0xf7f14c79
[   44.823203] RSP: 002b:00000000ffc340cc EFLAGS: 00000207 ORIG_RAX: 0000000000000036
[   44.830874] RAX: ffffffffffffffda RBX: 0000000000000006 RCX: 00000000400454ca
[   44.838106] RDX: 0000000020927fd8 RSI: 0000000000000037 RDI: 0000000000000005
[   44.845339] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   44.852572] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000
[   44.859804] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
[   44.867078] Dumping ftrace buffer:
[   44.870582]    (ftrace buffer empty)
[   44.874255] Kernel Offset: disabled
[   44.877845] Rebooting in 86400 seconds..