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-2,10.128.0.50' (ECDSA) to the list of known hosts.
executing program
executing program
syzkaller login: [   32.501216] ==================================================================
[   32.502304] BUG: KASAN: use-after-free in __internal_add_timer+0x275/0x2d0
[   32.503226] Write of size 8 at addr ffff8801d1f9b600 by task syzkaller432994/2988
[   32.504222] 
[   32.504456] CPU: 1 PID: 2988 Comm: syzkaller432994 Not tainted 4.14.0-rc5+ #142
[   32.505432] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.506649] Call Trace:
[   32.507006]  dump_stack+0x194/0x257
[   32.507745]  ? arch_local_irq_restore+0x53/0x53
[   32.508365]  ? show_regs_print_info+0x65/0x65
[   32.508968]  ? __kernel_text_address+0xd/0x40
[   32.509580]  ? __internal_add_timer+0x275/0x2d0
[   32.510201]  print_address_description+0x73/0x250
[   32.510867]  ? __internal_add_timer+0x275/0x2d0
[   32.511489]  kasan_report+0x25b/0x340
[   32.512003]  __asan_report_store8_noabort+0x17/0x20
[   32.512668]  __internal_add_timer+0x275/0x2d0
[   32.513272]  ? calc_wheel_index+0x200/0x200
[   32.513860]  mod_timer+0x622/0x15b0
[   32.514356]  ? mod_timer_pending+0x14e0/0x14e0
[   32.514965]  ? __lock_is_held+0xb6/0x140
[   32.515521]  ? __lock_is_held+0xb6/0x140
[   32.516070]  ? __lockdep_init_map+0xe4/0x650
[   32.516689]  ? lockdep_init_map+0x9/0x10
[   32.517234]  ? init_timer_key+0x126/0x3b0
[   32.517791]  ? try_to_del_timer_sync+0x120/0x120
[   32.518425]  ? round_jiffies_up+0xce/0x100
[   32.518991]  ? __round_jiffies_up_relative+0x150/0x150
[   32.519689]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   32.520347]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   32.521086]  __tun_chr_ioctl+0x1b17/0x3d20
[   32.523644]  ? tun_chr_read_iter+0x1e0/0x1e0
[   32.528014]  ? find_held_lock+0x35/0x1d0
[   32.532050]  ? __do_page_fault+0x64c/0xd60
[   32.536255]  ? lock_downgrade+0x990/0x990
[   32.540379]  ? handle_mm_fault+0x410/0x8d0
[   32.544597]  ? check_same_owner+0x320/0x320
[   32.548884]  ? up_read+0x1a/0x40
[   32.552234]  ? __do_page_fault+0x3d6/0xd60
[   32.556482]  ? tun_chr_compat_ioctl+0x30/0x30
[   32.560956]  tun_chr_ioctl+0x2a/0x40
[   32.564637]  ? tun_chr_ioctl+0x2a/0x40
[   32.568494]  do_vfs_ioctl+0x1b1/0x1520
[   32.572352]  ? ioctl_preallocate+0x2b0/0x2b0
[   32.576731]  ? selinux_capable+0x40/0x40
[   32.580760]  ? putname+0xf3/0x130
[   32.584184]  ? do_sys_open+0x320/0x6d0
[   32.588051]  ? security_file_ioctl+0x89/0xb0
[   32.592432]  SyS_ioctl+0x8f/0xc0
[   32.595771]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   32.600494] RIP: 0033:0x443dc9
[   32.603649] RSP: 002b:00007ffc51448528 EFLAGS: 00000207 ORIG_RAX: 0000000000000010
[   32.611330] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   32.618568] RDX: 0000000020927fd8 RSI: 00000000400454ca RDI: 0000000000000006
[   32.625806] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   32.633048] R10: 0000000000000000 R11: 0000000000000207 R12: e06f9881650b1748
[   32.640284] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   32.647536] 
[   32.649134] Allocated by task 2988:
[   32.652731]  save_stack_trace+0x16/0x20
[   32.656668]  save_stack+0x43/0xd0
[   32.660085]  kasan_kmalloc+0xad/0xe0
[   32.663764]  __kmalloc_node+0x47/0x70
[   32.667530]  kvmalloc_node+0x64/0xd0
[   32.671209]  alloc_netdev_mqs+0x16e/0xed0
[   32.675321]  __tun_chr_ioctl+0x12b2/0x3d20
[   32.679519]  tun_chr_ioctl+0x2a/0x40
[   32.683199]  do_vfs_ioctl+0x1b1/0x1520
[   32.687050]  SyS_ioctl+0x8f/0xc0
[   32.690384]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   32.695103] 
[   32.696698] Freed by task 2988:
[   32.699943]  save_stack_trace+0x16/0x20
[   32.703882]  save_stack+0x43/0xd0
[   32.707300]  kasan_slab_free+0x71/0xc0
[   32.711153]  kfree+0xca/0x250
[   32.714224]  kvfree+0x36/0x60
[   32.717294]  free_netdev+0x2cf/0x360
[   32.720973]  __tun_chr_ioctl+0x2cea/0x3d20
[   32.725172]  tun_chr_ioctl+0x2a/0x40
[   32.728850]  do_vfs_ioctl+0x1b1/0x1520
[   32.732699]  SyS_ioctl+0x8f/0xc0
[   32.736033]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   32.740750] 
[   32.742346] The buggy address belongs to the object at ffff8801d1f982c0
[   32.742346]  which belongs to the cache kmalloc-16384 of size 16384
[   32.755312] The buggy address is located 13120 bytes inside of
[   32.755312]  16384-byte region [ffff8801d1f982c0, ffff8801d1f9c2c0)
[   32.767494] The buggy address belongs to the page:
[   32.772391] page:ffffea000747e600 count:1 mapcount:0 mapping:ffff8801d1f982c0 index:0x0 compound_mapcount: 0
[   32.782323] flags: 0x200000000008100(slab|head)
[   32.786957] raw: 0200000000008100 ffff8801d1f982c0 0000000000000000 0000000100000001
[   32.794804] raw: ffffea0007641220 ffffea000747d220 ffff8801dac02200 0000000000000000
[   32.802645] page dumped because: kasan: bad access detected
[   32.808315] 
[   32.810167] Memory state around the buggy address:
[   32.815061]  ffff8801d1f9b500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.822385]  ffff8801d1f9b580: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.829706] >ffff8801d1f9b600: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.837028]                    ^
[   32.840356]  ffff8801d1f9b680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.847676]  ffff8801d1f9b700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   32.854997] ==================================================================
[   32.862318] Disabling lock debugging due to kernel taint
[   32.867728] Kernel panic - not syncing: panic_on_warn set ...
[   32.867728] 
[   32.875054] CPU: 1 PID: 2988 Comm: syzkaller432994 Tainted: G    B           4.14.0-rc5+ #142
[   32.883677] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   32.892993] Call Trace:
[   32.895546]  dump_stack+0x194/0x257
[   32.899137]  ? arch_local_irq_restore+0x53/0x53
[   32.903768]  ? kasan_end_report+0x32/0x50
[   32.907880]  ? lock_downgrade+0x990/0x990
[   32.911994]  ? __internal_add_timer+0x1f0/0x2d0
[   32.916628]  panic+0x1e4/0x417
[   32.919784]  ? __warn+0x1d9/0x1d9
[   32.923207]  ? __internal_add_timer+0x275/0x2d0
[   32.927837]  kasan_end_report+0x50/0x50
[   32.931774]  kasan_report+0x144/0x340
[   32.935539]  __asan_report_store8_noabort+0x17/0x20
[   32.940516]  __internal_add_timer+0x275/0x2d0
[   32.944973]  ? calc_wheel_index+0x200/0x200
[   32.949263]  mod_timer+0x622/0x15b0
[   32.952858]  ? mod_timer_pending+0x14e0/0x14e0
[   32.957404]  ? __lock_is_held+0xb6/0x140
[   32.961435]  ? __lock_is_held+0xb6/0x140
[   32.965465]  ? __lockdep_init_map+0xe4/0x650
[   32.969838]  ? lockdep_init_map+0x9/0x10
[   32.973863]  ? init_timer_key+0x126/0x3b0
[   32.977975]  ? try_to_del_timer_sync+0x120/0x120
[   32.982695]  ? round_jiffies_up+0xce/0x100
[   32.986890]  ? __round_jiffies_up_relative+0x150/0x150
[   32.992131]  ? debug_lockdep_rcu_enabled+0x77/0x90
[   32.997026]  ? selinux_tun_dev_alloc_security+0x124/0x170
[   33.002530]  __tun_chr_ioctl+0x1b17/0x3d20
[   33.006734]  ? tun_chr_read_iter+0x1e0/0x1e0
[   33.011108]  ? find_held_lock+0x35/0x1d0
[   33.015139]  ? __do_page_fault+0x64c/0xd60
[   33.019337]  ? lock_downgrade+0x990/0x990
[   33.023452]  ? handle_mm_fault+0x410/0x8d0
[   33.027658]  ? check_same_owner+0x320/0x320
[   33.031940]  ? up_read+0x1a/0x40
[   33.035269]  ? __do_page_fault+0x3d6/0xd60
[   33.039472]  ? tun_chr_compat_ioctl+0x30/0x30
[   33.043932]  tun_chr_ioctl+0x2a/0x40
[   33.047607]  ? tun_chr_ioctl+0x2a/0x40
[   33.051459]  do_vfs_ioctl+0x1b1/0x1520
[   33.055311]  ? ioctl_preallocate+0x2b0/0x2b0
[   33.059685]  ? selinux_capable+0x40/0x40
[   33.064076]  ? putname+0xf3/0x130
[   33.067512]  ? do_sys_open+0x320/0x6d0
[   33.071372]  ? security_file_ioctl+0x89/0xb0
[   33.075750]  SyS_ioctl+0x8f/0xc0
[   33.079087]  entry_SYSCALL_64_fastpath+0x1f/0xbe
[   33.083805] RIP: 0033:0x443dc9
[   33.086960] RSP: 002b:00007ffc51448528 EFLAGS: 00000207 ORIG_RAX: 0000000000000010
[   33.094630] RAX: ffffffffffffffda RBX: ffffffffffffffff RCX: 0000000000443dc9
[   33.101867] RDX: 0000000020927fd8 RSI: 00000000400454ca RDI: 0000000000000006
[   33.109102] RBP: 0000000000000082 R08: 0000000000000000 R09: 0000000000000000
[   33.116336] R10: 0000000000000000 R11: 0000000000000207 R12: e06f9881650b1748
[   33.123570] R13: 74656e2f7665642f R14: 0000000000000000 R15: 0000000000000000
[   33.130860] Dumping ftrace buffer:
[   33.134364]    (ftrace buffer empty)
[   33.138039] Kernel Offset: disabled
[   33.141634] Rebooting in 86400 seconds..