[....] Starting enhanced syslogd: rsyslogd[ 11.977785] audit: type=1400 audit(1514163287.464:4): avc: denied { syslog } for pid=3173 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[1G[[32m ok [39;49m8[?25h[?0c.
Starting mcstransd:
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting file context maintaining daemon: restorecond[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added 'ci-android-49-kasan-gce-9,10.128.15.225' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 32.577605] ==================================================================
[ 32.578689] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 32.579565] Read of size 8 at addr ffff8801c8a4afb8 by task syzkaller467194/3344
[ 32.580548]
[ 32.580780] CPU: 0 PID: 3344 Comm: syzkaller467194 Not tainted 4.9.71-g2506378 #113
[ 32.581850] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 32.583068] ffff8801cb3e78e0 ffffffff81d922b9 ffffea0007229280 ffff8801c8a4afb8
[ 32.584197] 0000000000000000 ffff8801c8a4afb8 ffff8801c8a4afb8 ffff8801cb3e7918
[ 32.585326] ffffffff8153bab3 ffff8801c8a4afb8 0000000000000008 0000000000000000
[ 32.586477] Call Trace:
[ 32.586832] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 32.587556] [<ffffffff8153bab3>] print_address_description+0x73/0x280
[ 32.588441] [<ffffffff8153bfd5>] kasan_report+0x275/0x360
[ 32.589200] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 32.590042] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 32.590939] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 32.591723] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 32.592521] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 32.593479] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 32.594400] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 32.595318] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 32.596108] [<ffffffff838a5813>] ? mutex_lock_nested+0x5e3/0x870
[ 32.596966] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 32.597748] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 32.603782] [<ffffffff838aedfe>] _raw_spin_lock_irqsave+0x4e/0x70
[ 32.610064] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 32.616086] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 32.621944] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 32.628923] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 32.636165] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 32.641496] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 32.646570] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 32.651898] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 32.658009] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 32.663079] [<ffffffff81573425>] ____fput+0x15/0x20
[ 32.668147] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 32.673822] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 32.679066] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 32.685351] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 32.691633] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 32.697745] [<ffffffff838aef67>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 32.704374] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 32.710050] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 32.715640] [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 32.722191]
[ 32.723793] Allocated by task 3344:
[ 32.727396] save_stack_trace+0x16/0x20
[ 32.731340] save_stack+0x43/0xd0
[ 32.734759] kasan_kmalloc+0xad/0xe0
[ 32.738438] kmem_cache_alloc_trace+0xfb/0x2a0
[ 32.743006] binder_get_thread+0x15d/0x750
[ 32.747205] binder_poll+0x4a/0x210
[ 32.750805] SyS_epoll_ctl+0x11d7/0x2190
[ 32.755620] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 32.760337]
[ 32.761928] Freed by task 3344:
[ 32.765175] save_stack_trace+0x16/0x20
[ 32.769124] save_stack+0x43/0xd0
[ 32.772551] kasan_slab_free+0x72/0xc0
[ 32.776409] kfree+0x103/0x300
[ 32.779566] binder_thread_dec_tmpref+0x1cc/0x240
[ 32.784375] binder_thread_release+0x27d/0x540
[ 32.788926] binder_ioctl+0x9c0/0x11b0
[ 32.792787] do_vfs_ioctl+0x1aa/0x1140
[ 32.796637] SyS_ioctl+0x8f/0xc0
[ 32.799968] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 32.804684]
[ 32.806278] The buggy address belongs to the object at ffff8801c8a4af00
[ 32.806278] which belongs to the cache kmalloc-512 of size 512
[ 32.818897] The buggy address is located 184 bytes inside of
[ 32.818897] 512-byte region [ffff8801c8a4af00, ffff8801c8a4b100)
[ 32.830735] The buggy address belongs to the page:
[ 32.835629] page:ffffea0007229280 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 32.845780] flags: 0x8000000000004080(slab|head)
[ 32.850515] page dumped because: kasan: bad access detected
[ 32.856212]
[ 32.857806] Memory state around the buggy address:
[ 32.862711] ffff8801c8a4ae80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 32.870046] ffff8801c8a4af00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.877369] >ffff8801c8a4af80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.884692] ^
[ 32.889850] ffff8801c8a4b000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.897181] ffff8801c8a4b080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 32.904517] ==================================================================
[ 32.911842] Disabling lock debugging due to kernel taint
[ 32.917257] Kernel panic - not syncing: panic_on_warn set ...
[ 32.917257]
[ 32.924591] CPU: 0 PID: 3344 Comm: syzkaller467194 Tainted: G B 4.9.71-g2506378 #113
[ 32.933561] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 32.942883] ffff8801cb3e7838 ffffffff81d922b9 ffffffff84194b3f ffff8801cb3e7910
[ 32.950839] 0000000000000000 ffff8801c8a4afb8 ffff8801c8a4afb8 ffff8801cb3e7900
[ 32.958788] ffffffff8142d741 0000000041b58ab3 ffffffff84188580 ffffffff8142d585
[ 32.966736] Call Trace:
[ 32.969308] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 32.974638] [<ffffffff8142d741>] panic+0x1bc/0x3a8
[ 32.979618] [<ffffffff8142d585>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 32.987813] [<ffffffff8112ec90>] ? add_taint+0x40/0x50
[ 32.993150] [<ffffffff8153ba20>] kasan_end_report+0x50/0x50
[ 32.998913] [<ffffffff8153bec7>] kasan_report+0x167/0x360
[ 33.004521] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 33.010634] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 33.017359] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 33.023295] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 33.029328] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 33.036313] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 33.043291] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 33.050278] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 33.056217] [<ffffffff838a5813>] ? mutex_lock_nested+0x5e3/0x870
[ 33.062420] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 33.068013] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 33.074034] [<ffffffff838aedfe>] _raw_spin_lock_irqsave+0x4e/0x70
[ 33.080318] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 33.086350] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 33.092208] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 33.099193] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 33.106432] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 33.111768] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 33.116836] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 33.122162] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 33.128278] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 33.133361] [<ffffffff81573425>] ____fput+0x15/0x20
[ 33.138437] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 33.144112] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 33.149356] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 33.155641] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 33.161574] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 33.167684] [<ffffffff838aef67>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 33.174322] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 33.180000] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 33.185595] [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 33.192482] Dumping ftrace buffer:
[ 33.195995] (ftrace buffer empty)
[ 33.199670] Kernel Offset: disabled
[ 33.203260] Rebooting in 86400 seconds..