[....] Starting enhanced syslogd: rsyslogd[ 10.890947] audit: type=1400 audit(1514315558.483:4): avc: denied { syslog } for pid=3175 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-8,10.128.0.35' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 22.014884] ==================================================================
[ 22.015923] BUG: KASAN: use-after-free in __lock_acquire+0x2eff/0x3640
[ 22.016822] Read of size 8 at addr ffff8801cc879c38 by task syzkaller781015/3330
[ 22.017820]
[ 22.018065] CPU: 0 PID: 3330 Comm: syzkaller781015 Not tainted 4.9.71-g2506378 #113
[ 22.019085] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 22.020302] ffff8801bf5978e0 ffffffff81d922b9 ffffea0007321e00 ffff8801cc879c38
[ 22.021426] 0000000000000000 ffff8801cc879c38 ffff8801cc879c38 ffff8801bf597918
[ 22.022565] ffffffff8153bab3 ffff8801cc879c38 0000000000000008 0000000000000000
[ 22.023685] Call Trace:
[ 22.024040] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 22.024751] [<ffffffff8153bab3>] print_address_description+0x73/0x280
[ 22.025649] [<ffffffff8153bfd5>] kasan_report+0x275/0x360
[ 22.026392] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 22.027243] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 22.028128] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 22.028912] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 22.029709] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.030648] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.031566] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.032509] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 22.033314] [<ffffffff838a5813>] ? mutex_lock_nested+0x5e3/0x870
[ 22.034133] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 22.034889] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 22.040398] [<ffffffff838aedfe>] _raw_spin_lock_irqsave+0x4e/0x70
[ 22.046678] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 22.052701] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 22.058552] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 22.065529] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 22.072762] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 22.078092] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 22.083157] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 22.088482] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 22.094591] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 22.099657] [<ffffffff81573425>] ____fput+0x15/0x20
[ 22.104722] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 22.110396] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 22.115639] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 22.121921] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 22.127858] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 22.133967] [<ffffffff815d0b6d>] ? fd_install+0x4d/0x60
[ 22.139379] [<ffffffff838aef67>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 22.146012] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 22.151686] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 22.157273] [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 22.163815]
[ 22.165409] Allocated by task 3330:
[ 22.169000] save_stack_trace+0x16/0x20
[ 22.172938] save_stack+0x43/0xd0
[ 22.176352] kasan_kmalloc+0xad/0xe0
[ 22.180028] kmem_cache_alloc_trace+0xfb/0x2a0
[ 22.184573] binder_get_thread+0x15d/0x750
[ 22.188771] binder_poll+0x4a/0x210
[ 22.192362] SyS_epoll_ctl+0x11d7/0x2190
[ 22.196386] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 22.201100]
[ 22.202692] Freed by task 3330:
[ 22.205936] save_stack_trace+0x16/0x20
[ 22.209871] save_stack+0x43/0xd0
[ 22.213287] kasan_slab_free+0x72/0xc0
[ 22.217135] kfree+0x103/0x300
[ 22.220290] binder_thread_dec_tmpref+0x1cc/0x240
[ 22.225095] binder_thread_release+0x27d/0x540
[ 22.229638] binder_ioctl+0x9c0/0x11b0
[ 22.233489] do_vfs_ioctl+0x1aa/0x1140
[ 22.237339] SyS_ioctl+0x8f/0xc0
[ 22.240667] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 22.245383]
[ 22.246976] The buggy address belongs to the object at ffff8801cc879b80
[ 22.246976] which belongs to the cache kmalloc-512 of size 512
[ 22.259593] The buggy address is located 184 bytes inside of
[ 22.259593] 512-byte region [ffff8801cc879b80, ffff8801cc879d80)
[ 22.271427] The buggy address belongs to the page:
[ 22.276320] page:ffffea0007321e00 count:1 mapcount:0 mapping: (null) index:0x0 compound_mapcount: 0
[ 22.286472] flags: 0x8000000000004080(slab|head)
[ 22.291186] page dumped because: kasan: bad access detected
[ 22.296856]
[ 22.298447] Memory state around the buggy address:
[ 22.303337] ffff8801cc879b00: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
[ 22.310657] ffff8801cc879b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.317976] >ffff8801cc879c00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.325294] ^
[ 22.330445] ffff8801cc879c80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.337765] ffff8801cc879d00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ 22.345082] ==================================================================
[ 22.352401] Disabling lock debugging due to kernel taint
[ 22.357813] Kernel panic - not syncing: panic_on_warn set ...
[ 22.357813]
[ 22.365136] CPU: 0 PID: 3330 Comm: syzkaller781015 Tainted: G B 4.9.71-g2506378 #113
[ 22.374107] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 22.383425] ffff8801bf597838 ffffffff81d922b9 ffffffff84194b3f ffff8801bf597910
[ 22.391367] 0000000000000000 ffff8801cc879c38 ffff8801cc879c38 ffff8801bf597900
[ 22.399305] ffffffff8142d741 0000000041b58ab3 ffffffff84188580 ffffffff8142d585
[ 22.407255] Call Trace:
[ 22.409807] [<ffffffff81d922b9>] dump_stack+0xc1/0x128
[ 22.415137] [<ffffffff8142d741>] panic+0x1bc/0x3a8
[ 22.420140] [<ffffffff8142d585>] ? percpu_up_read_preempt_enable.constprop.53+0xd7/0xd7
[ 22.428332] [<ffffffff8112ec90>] ? add_taint+0x40/0x50
[ 22.433661] [<ffffffff8153ba20>] kasan_end_report+0x50/0x50
[ 22.439421] [<ffffffff8153bec7>] kasan_report+0x167/0x360
[ 22.445007] [<ffffffff8123cf1f>] ? __lock_acquire+0x2eff/0x3640
[ 22.451114] [<ffffffff8153c134>] __asan_report_load8_noabort+0x14/0x20
[ 22.457830] [<ffffffff8123cf1f>] __lock_acquire+0x2eff/0x3640
[ 22.463765] [<ffffffff8123a649>] ? __lock_acquire+0x629/0x3640
[ 22.469786] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.476762] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.483739] [<ffffffff8123a020>] ? debug_check_no_locks_freed+0x2c0/0x2c0
[ 22.490715] [<ffffffff8123940f>] ? mark_held_locks+0xaf/0x100
[ 22.496654] [<ffffffff838a5813>] ? mutex_lock_nested+0x5e3/0x870
[ 22.502855] [<ffffffff8123e09e>] lock_acquire+0x12e/0x410
[ 22.508445] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 22.514465] [<ffffffff838aedfe>] _raw_spin_lock_irqsave+0x4e/0x70
[ 22.520744] [<ffffffff81222604>] ? remove_wait_queue+0x14/0x40
[ 22.526764] [<ffffffff81222604>] remove_wait_queue+0x14/0x40
[ 22.532611] [<ffffffff8164eaef>] ep_unregister_pollwait.isra.6+0xaf/0x240
[ 22.539587] [<ffffffff8164eb6a>] ? ep_unregister_pollwait.isra.6+0x12a/0x240
[ 22.546824] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 22.552148] [<ffffffff8164f836>] ep_free+0x96/0x1b0
[ 22.557214] [<ffffffff8164f950>] ? ep_free+0x1b0/0x1b0
[ 22.562541] [<ffffffff8164f994>] ep_eventpoll_release+0x44/0x60
[ 22.568650] [<ffffffff81572f4c>] __fput+0x28c/0x6e0
[ 22.573717] [<ffffffff81573425>] ____fput+0x15/0x20
[ 22.578783] [<ffffffff81193a25>] task_work_run+0x115/0x190
[ 22.584458] [<ffffffff8113a507>] do_exit+0x7e7/0x2a40
[ 22.589700] [<ffffffff81be83e5>] ? selinux_file_ioctl+0x355/0x530
[ 22.595983] [<ffffffff81139d20>] ? release_task+0x1240/0x1240
[ 22.601916] [<ffffffff81651890>] ? SyS_epoll_create+0x190/0x190
[ 22.608022] [<ffffffff815d0b6d>] ? fd_install+0x4d/0x60
[ 22.613439] [<ffffffff838aef67>] ? entry_SYSCALL_64_fastpath+0x5/0xc6
[ 22.620068] [<ffffffff81140c18>] do_group_exit+0x108/0x320
[ 22.625740] [<ffffffff81140e4d>] SyS_exit_group+0x1d/0x20
[ 22.631339] [<ffffffff838aef85>] entry_SYSCALL_64_fastpath+0x23/0xc6
[ 22.638288] Dumping ftrace buffer:
[ 22.641795] (ftrace buffer empty)
[ 22.645471] Kernel Offset: disabled
[ 22.649061] Rebooting in 86400 seconds..