[....] Starting enhanced syslogd: rsyslogd[ 12.600829] audit: type=1400 audit(1515982781.736:5): avc: denied { syslog } for pid=3506 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 OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 18.899827] audit: type=1400 audit(1515982788.035:6): avc: denied { map } for pid=3647 comm="bash" path="/bin/bash" dev="sda1" ino=1457 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=system_u:object_r:file_t:s0 tclass=file permissive=1 Warning: Permanently added '10.128.0.61' (ECDSA) to the list of known hosts. executing program [ 31.642570] audit: type=1400 audit(1515982800.778:7): avc: denied { map } for pid=3664 comm="syzkaller202081" path="/root/syzkaller202081570" dev="sda1" ino=16481 scontext=unconfined_u:system_r:insmod_t:s0-s0:c0.c1023 tcontext=unconfined_u:object_r:user_home_t:s0 tclass=file permissive=1 [ 31.647179] ================================================================== [ 31.647190] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 31.647194] Read of size 8 at addr ffff8801d963caf0 by task syzkaller202081/3664 [ 31.647195] [ 31.647199] CPU: 0 PID: 3664 Comm: syzkaller202081 Not tainted 4.15.0-rc7+ #172 [ 31.647202] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.647203] Call Trace: [ 31.647212] dump_stack+0x194/0x257 [ 31.647221] ? arch_local_irq_restore+0x53/0x53 [ 31.647227] ? show_regs_print_info+0x18/0x18 [ 31.647230] ? print_irqtrace_events+0x270/0x270 [ 31.647234] ? __lock_acquire+0x664/0x3e00 [ 31.647238] ? __lock_acquire+0x3d4d/0x3e00 [ 31.647245] print_address_description+0x73/0x250 [ 31.647249] ? __lock_acquire+0x3d4d/0x3e00 [ 31.647253] kasan_report+0x25b/0x340 [ 31.647257] __asan_report_load8_noabort+0x14/0x20 [ 31.647261] __lock_acquire+0x3d4d/0x3e00 [ 31.647264] ? __lock_acquire+0x664/0x3e00 [ 31.647268] ? lock_downgrade+0x980/0x980 [ 31.647271] ? lock_downgrade+0x980/0x980 [ 31.647275] ? print_irqtrace_events+0x270/0x270 [ 31.647280] ? remove_wait_queue+0x81/0x350 [ 31.647285] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647293] ? __lock_acquire+0x664/0x3e00 [ 31.647297] ? check_noncircular+0x20/0x20 [ 31.647304] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647308] ? lock_acquire+0x1d5/0x580 [ 31.647311] ? lock_acquire+0x1d5/0x580 [ 31.647317] ? ep_free+0xf4/0x320 [ 31.647321] ? lock_release+0xa40/0xa40 [ 31.647327] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 31.647330] ? print_irqtrace_events+0x270/0x270 [ 31.647334] ? print_irqtrace_events+0x270/0x270 [ 31.647340] ? rcu_note_context_switch+0x710/0x710 [ 31.647344] ? __might_sleep+0x95/0x190 [ 31.647348] ? ep_free+0xf4/0x320 [ 31.647352] ? __mutex_lock+0x16f/0x1a80 [ 31.647355] ? ep_free+0xf4/0x320 [ 31.647359] ? print_irqtrace_events+0x270/0x270 [ 31.647362] ? ep_free+0xf4/0x320 [ 31.647367] lock_acquire+0x1d5/0x580 [ 31.647371] ? lock_acquire+0x1d5/0x580 [ 31.647375] ? remove_wait_queue+0x81/0x350 [ 31.647379] ? lock_release+0xa40/0xa40 [ 31.647384] ? lock_acquire+0x1d5/0x580 [ 31.647388] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647391] ? lock_acquire+0x1d5/0x580 [ 31.647395] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 31.647400] _raw_spin_lock_irqsave+0x96/0xc0 [ 31.647403] ? remove_wait_queue+0x81/0x350 [ 31.647407] remove_wait_queue+0x81/0x350 [ 31.647413] ? depot_save_stack+0x3b5/0x490 [ 31.647417] ? add_wait_queue+0x290/0x290 [ 31.647421] ? rcutorture_record_progress+0x10/0x10 [ 31.647424] ? lock_release+0xa40/0xa40 [ 31.647430] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 31.647436] ? __kernel_text_address+0xd/0x40 [ 31.647441] ? clear_tfile_check_list+0x370/0x370 [ 31.647445] ? check_noncircular+0x20/0x20 [ 31.647452] ? locks_remove_file+0x3fa/0x5a0 [ 31.647457] ep_free+0x13f/0x320 [ 31.647461] ? ep_remove+0x800/0x800 [ 31.647464] ? fsnotify_first_mark+0x2b0/0x2b0 [ 31.647469] ? ep_free+0x320/0x320 [ 31.647473] ep_eventpoll_release+0x44/0x60 [ 31.647479] __fput+0x327/0x7e0 [ 31.647484] ? fput+0x140/0x140 [ 31.647488] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.647493] ____fput+0x15/0x20 [ 31.647497] task_work_run+0x199/0x270 [ 31.647502] ? task_work_cancel+0x210/0x210 [ 31.647506] ? _raw_spin_unlock+0x22/0x30 [ 31.647510] ? switch_task_namespaces+0x87/0xc0 [ 31.647516] do_exit+0x9bb/0x1ad0 [ 31.647521] ? __handle_mm_fault+0x2330/0x3ce0 [ 31.647525] ? mm_update_next_owner+0x930/0x930 [ 31.647531] ? do_raw_spin_trylock+0x190/0x190 [ 31.647536] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 31.647539] ? check_noncircular+0x20/0x20 [ 31.647544] ? _raw_spin_unlock+0x22/0x30 [ 31.647547] ? __handle_mm_fault+0x80e/0x3ce0 [ 31.647552] ? check_noncircular+0x20/0x20 [ 31.647555] ? __pmd_alloc+0x4e0/0x4e0 [ 31.647558] ? lock_downgrade+0x980/0x980 [ 31.647563] ? find_held_lock+0x35/0x1d0 [ 31.647567] ? handle_mm_fault+0x248/0x8d0 [ 31.647571] ? find_held_lock+0x35/0x1d0 [ 31.647578] ? __do_page_fault+0x5f7/0xc90 [ 31.647581] ? lock_downgrade+0x980/0x980 [ 31.647586] ? handle_mm_fault+0x410/0x8d0 [ 31.647590] ? down_read_trylock+0xdb/0x170 [ 31.647593] ? __do_page_fault+0x32d/0xc90 [ 31.647597] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 31.647601] ? vmacache_find+0x5f/0x280 [ 31.647606] do_group_exit+0x149/0x400 [ 31.647609] ? __do_page_fault+0x3d6/0xc90 [ 31.647613] ? SyS_exit+0x30/0x30 [ 31.647619] ? do_fast_syscall_32+0x156/0xf9d [ 31.647622] ? do_group_exit+0x400/0x400 [ 31.647626] SyS_exit_group+0x1d/0x20 [ 31.647630] do_fast_syscall_32+0x3ee/0xf9d [ 31.647635] ? do_int80_syscall_32+0x9d0/0x9d0 [ 31.647638] ? kasan_check_read+0x11/0x20 [ 31.647642] ? syscall_return_slowpath+0x550/0x550 [ 31.647647] ? SyS_rt_sigaction+0x94/0x1b0 [ 31.647651] ? SyS_sigprocmask+0x4b0/0x4b0 [ 31.647654] ? SyS_read+0x184/0x220 [ 31.647658] ? retint_user+0x18/0x18 [ 31.647663] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.647668] entry_SYSENTER_compat+0x54/0x63 [ 31.647672] RIP: 0023:0xf7f71c79 [ 31.647674] RSP: 002b:00000000ffb6f55c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 31.647678] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 31.647680] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 31.647682] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 31.647684] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 31.647686] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 31.647690] [ 31.647692] Allocated by task 3664: [ 31.647696] save_stack+0x43/0xd0 [ 31.647699] kasan_kmalloc+0xad/0xe0 [ 31.647702] kmem_cache_alloc_trace+0x136/0x750 [ 31.647706] binder_get_thread+0x1cf/0x870 [ 31.647709] binder_poll+0x8c/0x390 [ 31.647712] ep_item_poll.isra.10+0xec/0x320 [ 31.647715] ep_insert+0x6a3/0x1b10 [ 31.647719] SyS_epoll_ctl+0x12e4/0x1ab0 [ 31.647722] do_fast_syscall_32+0x3ee/0xf9d [ 31.647725] entry_SYSENTER_compat+0x54/0x63 [ 31.647725] [ 31.647727] Freed by task 3664: [ 31.647729] save_stack+0x43/0xd0 [ 31.647732] kasan_slab_free+0x71/0xc0 [ 31.647734] kfree+0xd6/0x260 [ 31.647738] binder_thread_dec_tmpref+0x27f/0x310 [ 31.647741] binder_thread_release+0x27d/0x540 [ 31.647744] binder_ioctl+0xc02/0x1417 [ 31.647748] compat_SyS_ioctl+0x151/0x2a30 [ 31.647751] do_fast_syscall_32+0x3ee/0xf9d [ 31.647753] entry_SYSENTER_compat+0x54/0x63 [ 31.647754] [ 31.647757] The buggy address belongs to the object at ffff8801d963ca40 [ 31.647757] which belongs to the cache kmalloc-512 of size 512 [ 31.647760] The buggy address is located 176 bytes inside of [ 31.647760] 512-byte region [ffff8801d963ca40, ffff8801d963cc40) [ 31.647761] The buggy address belongs to the page: [ 31.647764] page:ffffea0007658f00 count:1 mapcount:0 mapping:ffff8801d963c040 index:0x0 [ 31.647768] flags: 0x2fffc0000000100(slab) [ 31.647774] raw: 02fffc0000000100 ffff8801d963c040 0000000000000000 0000000100000006 [ 31.647778] raw: ffffea0006f1e560 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 31.647779] page dumped because: kasan: bad access detected [ 31.647780] [ 31.647781] Memory state around the buggy address: [ 31.647784] ffff8801d963c980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 31.647787] ffff8801d963ca00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 31.647789] >ffff8801d963ca80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.647791] ^ [ 31.647793] ffff8801d963cb00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.647796] ffff8801d963cb80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 31.647797] ================================================================== [ 31.647799] Disabling lock debugging due to kernel taint [ 31.647801] Kernel panic - not syncing: panic_on_warn set ... [ 31.647801] [ 31.647805] CPU: 0 PID: 3664 Comm: syzkaller202081 Tainted: G B 4.15.0-rc7+ #172 [ 31.647807] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 31.647808] Call Trace: [ 31.647812] dump_stack+0x194/0x257 [ 31.647817] ? arch_local_irq_restore+0x53/0x53 [ 31.647820] ? kasan_end_report+0x32/0x50 [ 31.647824] ? lock_downgrade+0x980/0x980 [ 31.647830] ? vsnprintf+0x1ed/0x1900 [ 31.647833] ? __lock_acquire+0x3c70/0x3e00 [ 31.647837] panic+0x1e4/0x41c [ 31.647840] ? refcount_error_report+0x214/0x214 [ 31.647844] ? add_taint+0x40/0x50 [ 31.647847] ? add_taint+0x1c/0x50 [ 31.647851] ? __lock_acquire+0x3d4d/0x3e00 [ 31.647855] kasan_end_report+0x50/0x50 [ 31.647858] kasan_report+0x144/0x340 [ 31.647863] __asan_report_load8_noabort+0x14/0x20 [ 31.647867] __lock_acquire+0x3d4d/0x3e00 [ 31.647870] ? __lock_acquire+0x664/0x3e00 [ 31.647874] ? lock_downgrade+0x980/0x980 [ 31.647877] ? lock_downgrade+0x980/0x980 [ 31.647880] ? print_irqtrace_events+0x270/0x270 [ 31.647884] ? remove_wait_queue+0x81/0x350 [ 31.647889] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647893] ? __lock_acquire+0x664/0x3e00 [ 31.647896] ? check_noncircular+0x20/0x20 [ 31.647903] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647907] ? lock_acquire+0x1d5/0x580 [ 31.647910] ? lock_acquire+0x1d5/0x580 [ 31.647913] ? ep_free+0xf4/0x320 [ 31.647918] ? lock_release+0xa40/0xa40 [ 31.647922] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 31.647925] ? print_irqtrace_events+0x270/0x270 [ 31.647928] ? print_irqtrace_events+0x270/0x270 [ 31.647932] ? rcu_note_context_switch+0x710/0x710 [ 31.647936] ? __might_sleep+0x95/0x190 [ 31.647940] ? ep_free+0xf4/0x320 [ 31.647943] ? __mutex_lock+0x16f/0x1a80 [ 31.647946] ? ep_free+0xf4/0x320 [ 31.647950] ? print_irqtrace_events+0x270/0x270 [ 31.647953] ? ep_free+0xf4/0x320 [ 31.647958] lock_acquire+0x1d5/0x580 [ 31.647961] ? lock_acquire+0x1d5/0x580 [ 31.647965] ? remove_wait_queue+0x81/0x350 [ 31.647969] ? lock_release+0xa40/0xa40 [ 31.647974] ? lock_acquire+0x1d5/0x580 [ 31.647978] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 31.647981] ? lock_acquire+0x1d5/0x580 [ 31.647985] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 31.647989] _raw_spin_lock_irqsave+0x96/0xc0 [ 31.647993] ? remove_wait_queue+0x81/0x350 [ 31.647997] remove_wait_queue+0x81/0x350 [ 31.648000] ? depot_save_stack+0x3b5/0x490 [ 31.648008] ? add_wait_queue+0x290/0x290 [ 31.648011] ? rcutorture_record_progress+0x10/0x10 [ 31.648015] ? lock_release+0xa40/0xa40 [ 31.648020] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 31.648024] ? __kernel_text_address+0xd/0x40 [ 31.648029] ? clear_tfile_check_list+0x370/0x370 [ 31.648033] ? check_noncircular+0x20/0x20 [ 31.648038] ? locks_remove_file+0x3fa/0x5a0 [ 31.648043] ep_free+0x13f/0x320 [ 31.648047] ? ep_remove+0x800/0x800 [ 31.648050] ? fsnotify_first_mark+0x2b0/0x2b0 [ 31.648054] ? ep_free+0x320/0x320 [ 31.648058] ep_eventpoll_release+0x44/0x60 [ 31.648062] __fput+0x327/0x7e0 [ 31.648067] ? fput+0x140/0x140 [ 31.648071] ? _raw_spin_unlock_irq+0x27/0x70 [ 31.648076] ____fput+0x15/0x20 [ 31.648080] task_work_run+0x199/0x270 [ 31.648084] ? task_work_cancel+0x210/0x210 [ 31.648088] ? _raw_spin_unlock+0x22/0x30 [ 31.648092] ? switch_task_namespaces+0x87/0xc0 [ 31.648096] do_exit+0x9bb/0x1ad0 [ 31.648100] ? __handle_mm_fault+0x2330/0x3ce0 [ 31.648104] ? mm_update_next_owner+0x930/0x930 [ 31.648109] ? do_raw_spin_trylock+0x190/0x190 [ 31.648114] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 31.648117] ? check_noncircular+0x20/0x20 [ 31.648122] ? _raw_spin_unlock+0x22/0x30 [ 31.648125] ? __handle_mm_fault+0x80e/0x3ce0 [ 31.648129] ? check_noncircular+0x20/0x20 [ 31.648132] ? __pmd_alloc+0x4e0/0x4e0 [ 31.648136] ? lock_downgrade+0x980/0x980 [ 31.648140] ? find_held_lock+0x35/0x1d0 [ 31.648145] ? handle_mm_fault+0x248/0x8d0 [ 31.648149] ? find_held_lock+0x35/0x1d0 [ 31.648154] ? __do_page_fault+0x5f7/0xc90 [ 31.648158] ? lock_downgrade+0x980/0x980 [ 31.648163] ? handle_mm_fault+0x410/0x8d0 [ 31.648166] ? down_read_trylock+0xdb/0x170 [ 31.648169] ? __do_page_fault+0x32d/0xc90 [ 31.648173] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 31.648177] ? vmacache_find+0x5f/0x280 [ 31.648181] do_group_exit+0x149/0x400 [ 31.648185] ? __do_page_fault+0x3d6/0xc90 [ 31.648189] ? SyS_exit+0x30/0x30 [ 31.648193] ? do_fast_syscall_32+0x156/0xf9d [ 31.648197] ? do_group_exit+0x400/0x400 [ 31.648200] SyS_exit_group+0x1d/0x20 [ 31.648204] do_fast_syscall_32+0x3ee/0xf9d [ 31.648209] ? do_int80_syscall_32+0x9d0/0x9d0 [ 31.648212] ? kasan_check_read+0x11/0x20 [ 31.648217] ? syscall_return_slowpath+0x550/0x550 [ 31.648221] ? SyS_rt_sigaction+0x94/0x1b0 [ 31.648225] ? SyS_sigprocmask+0x4b0/0x4b0 [ 31.648228] ? SyS_read+0x184/0x220 [ 31.648231] ? retint_user+0x18/0x18 [ 31.648235] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 31.648240] entry_SYSENTER_compat+0x54/0x63 [ 31.648242] RIP: 0023:0xf7f71c79 [ 31.648244] RSP: 002b:00000000ffb6f55c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 31.648247] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 31.648249] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 31.648251] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 31.648253] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 31.648255] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 31.668921] Dumping ftrace buffer: [ 31.668924] (ftrace buffer empty) [ 31.668926] Kernel Offset: disabled [ 32.983396] Rebooting in 86400 seconds..