[....] Starting enhanced syslogd: rsyslogd[   10.434754] audit: type=1400 audit(1515500350.584:4): avc:  denied  { syslog } for  pid=3159 comm="rsyslogd" capability=34  scontext=system_u:system_r:kernel_t:s0 tcontext=system_u:system_r:kernel_t:s0 tclass=capability2 permissive=1
[?25l[?1c7[ ok 8[?25h[?0c.
Starting mcstransd: 
[....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c.
[....] Starting file context maintaining daemon: restorecond[?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 '10.128.0.13' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [   34.607961] ==================================================================
[   34.609227] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[   34.610124] Read of size 8 at addr ffff8801c9a19738 by task syzkaller990660/3328
[   34.611197] 
[   34.611430] CPU: 0 PID: 3328 Comm: syzkaller990660 Not tainted 4.9.75-gb54d99a #8
[   34.612468] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.613815]  ffff8801c88c78e0 ffffffff81d93049 ffffea0007268600 ffff8801c9a19738
[   34.615049]  0000000000000000 ffff8801c9a19738 ffff8801c9a19738 ffff8801c88c7918
[   34.616306]  ffffffff8153ca53 ffff8801c9a19738 0000000000000008 0000000000000000
[   34.617525] Call Trace:
[   34.617918]  [<ffffffff81d93049>] dump_stack+0xc1/0x128
[   34.618631]  [<ffffffff8153ca53>] print_address_description+0x73/0x280
[   34.619625]  [<ffffffff8153cf75>] kasan_report+0x275/0x360
[   34.620415]  [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[   34.621223]  [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[   34.622108]  [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[   34.622925]  [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[   34.623751]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   34.624713]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   34.625636]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   34.626554]  [<ffffffff8123a05f>] ? mark_held_locks+0xaf/0x100
[   34.627417]  [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[   34.629325]  [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[   34.634924]  [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[   34.640949]  [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[   34.647244]  [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[   34.653267]  [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[   34.659121]  [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[   34.666110]  [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[   34.673347]  [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[   34.678674]  [<ffffffff816507d6>] ep_free+0x96/0x1b0
[   34.683750]  [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[   34.689078]  [<ffffffff81650934>] ep_eventpoll_release+0x44/0x60
[   34.695198]  [<ffffffff81573eec>] __fput+0x28c/0x6e0
[   34.700265]  [<ffffffff815743c5>] ____fput+0x15/0x20
[   34.705333]  [<ffffffff81194675>] task_work_run+0x115/0x190
[   34.711011]  [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[   34.716270]  [<ffffffff81be9385>] ? selinux_file_ioctl+0x355/0x530
[   34.722555]  [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[   34.728494]  [<ffffffff81652830>] ? SyS_epoll_create+0x190/0x190
[   34.734608]  [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[   34.741241]  [<ffffffff81141868>] do_group_exit+0x108/0x320
[   34.746922]  [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[   34.752512]  [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[   34.759054] 
[   34.760648] Allocated by task 3328:
[   34.764243]  save_stack_trace+0x16/0x20
[   34.768184]  save_stack+0x43/0xd0
[   34.771602]  kasan_kmalloc+0xad/0xe0
[   34.775281]  kmem_cache_alloc_trace+0xfb/0x2a0
[   34.779830]  binder_get_thread+0x15d/0x750
[   34.784030]  binder_poll+0x4a/0x210
[   34.787625]  SyS_epoll_ctl+0x11d7/0x2190
[   34.791649]  entry_SYSCALL_64_fastpath+0x23/0xe2
[   34.796367] 
[   34.797961] Freed by task 3328:
[   34.801205]  save_stack_trace+0x16/0x20
[   34.805144]  save_stack+0x43/0xd0
[   34.808561]  kasan_slab_free+0x72/0xc0
[   34.812412]  kfree+0x103/0x300
[   34.815579]  binder_thread_dec_tmpref+0x1cc/0x240
[   34.820394]  binder_thread_release+0x27d/0x540
[   34.824941]  binder_ioctl+0x9c0/0x11b0
[   34.828798]  do_vfs_ioctl+0x1aa/0x1140
[   34.832648]  SyS_ioctl+0x8f/0xc0
[   34.835982]  entry_SYSCALL_64_fastpath+0x23/0xe2
[   34.840700] 
[   34.842293] The buggy address belongs to the object at ffff8801c9a19680
[   34.842293]  which belongs to the cache kmalloc-512 of size 512
[   34.854915] The buggy address is located 184 bytes inside of
[   34.854915]  512-byte region [ffff8801c9a19680, ffff8801c9a19880)
[   34.866754] The buggy address belongs to the page:
[   34.871665] page:ffffea0007268600 count:1 mapcount:0 mapping:          (null) index:0x0 compound_mapcount: 0
[   34.881829] flags: 0x8000000000004080(slab|head)
[   34.886572] page dumped because: kasan: bad access detected
[   34.892250] 
[   34.893841] Memory state around the buggy address:
[   34.898736]  ffff8801c9a19600: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[   34.906060]  ffff8801c9a19680: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.913384] >ffff8801c9a19700: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.920717]                                         ^
[   34.925871]  ffff8801c9a19780: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.933193]  ffff8801c9a19800: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[   34.940514] ==================================================================
[   34.947839] Disabling lock debugging due to kernel taint
[   34.953253] Kernel panic - not syncing: panic_on_warn set ...
[   34.953253] 
[   34.960666] CPU: 0 PID: 3328 Comm: syzkaller990660 Tainted: G    B           4.9.75-gb54d99a #8
[   34.969465] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   34.978788]  ffff8801c88c7838 ffffffff81d93049 ffffffff84195be7 ffff8801c88c7910
[   34.986745]  0000000000000000 ffff8801c9a19738 ffff8801c9a19738 ffff8801c88c7900
[   34.994696]  ffffffff8142e281 0000000041b58ab3 ffffffff84189648 ffffffff8142e0c5
[   35.003259] Call Trace:
[   35.005815]  [<ffffffff81d93049>] dump_stack+0xc1/0x128
[   35.011143]  [<ffffffff8142e281>] panic+0x1bc/0x3a8
[   35.016126]  [<ffffffff8142e0c5>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[   35.024322]  [<ffffffff8112f8e0>] ? add_taint+0x40/0x50
[   35.029655]  [<ffffffff8153c9c0>] kasan_end_report+0x50/0x50
[   35.035420]  [<ffffffff8153ce67>] kasan_report+0x167/0x360
[   35.041010]  [<ffffffff8123db6f>] ? __lock_acquire+0x2eff/0x3640
[   35.047120]  [<ffffffff8153d0d4>] __asan_report_load8_noabort+0x14/0x20
[   35.053846]  [<ffffffff8123db6f>] __lock_acquire+0x2eff/0x3640
[   35.059792]  [<ffffffff8123b299>] ? __lock_acquire+0x629/0x3640
[   35.065826]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   35.072808]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   35.079788]  [<ffffffff8123ac70>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[   35.086863]  [<ffffffff8123a05f>] ? mark_held_locks+0xaf/0x100
[   35.092800]  [<ffffffff838a7203>] ? mutex_lock_nested+0x5e3/0x870
[   35.099000]  [<ffffffff8123ecee>] lock_acquire+0x12e/0x410
[   35.104598]  [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[   35.110637]  [<ffffffff838b08ce>] _raw_spin_lock_irqsave+0x4e/0x70
[   35.116930]  [<ffffffff81223254>] ? remove_wait_queue+0x14/0x40
[   35.122956]  [<ffffffff81223254>] remove_wait_queue+0x14/0x40
[   35.128817]  [<ffffffff8164fa8f>] ep_unregister_pollwait.isra.6+0xaf/0x240
[   35.135796]  [<ffffffff8164fb0a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[   35.143034]  [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[   35.148366]  [<ffffffff816507d6>] ep_free+0x96/0x1b0
[   35.153435]  [<ffffffff816508f0>] ? ep_free+0x1b0/0x1b0
[   35.158852]  [<ffffffff81650934>] ep_eventpoll_release+0x44/0x60
[   35.164966]  [<ffffffff81573eec>] __fput+0x28c/0x6e0
[   35.170036]  [<ffffffff815743c5>] ____fput+0x15/0x20
[   35.175111]  [<ffffffff81194675>] task_work_run+0x115/0x190
[   35.180798]  [<ffffffff8113b157>] do_exit+0x7e7/0x2a40
[   35.186041]  [<ffffffff81be9385>] ? selinux_file_ioctl+0x355/0x530
[   35.192333]  [<ffffffff8113a970>] ? release_task+0x1240/0x1240
[   35.198290]  [<ffffffff81652830>] ? SyS_epoll_create+0x190/0x190
[   35.204403]  [<ffffffff838b0a8a>] ? entry_SYSCALL_64_fastpath+0x5/0xe2
[   35.211035]  [<ffffffff81141868>] do_group_exit+0x108/0x320
[   35.216712]  [<ffffffff81141a9d>] SyS_exit_group+0x1d/0x20
[   35.222300]  [<ffffffff838b0aa8>] entry_SYSCALL_64_fastpath+0x23/0xe2
[   35.228895] Dumping ftrace buffer:
[   35.232404]    (ftrace buffer empty)
[   35.236080] Kernel Offset: disabled
[   35.239670] Rebooting in 86400 seconds..