[....] Starting enhanced syslogd: rsyslogd[ 12.142677] audit: type=1400 audit(1515935050.835:5): avc: denied { syslog } for pid=3496 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: [ 18.218828] audit: type=1400 audit(1515935056.911:6): avc: denied { map } for pid=3637 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 '10.128.15.225' (ECDSA) to the list of known hosts. executing program [ 38.811407] audit: type=1400 audit(1515935077.504:7): avc: denied { map } for pid=3654 comm="syzkaller301142" path="/root/syzkaller301142266" 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 [ 38.815216] ================================================================== [ 38.815227] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 38.815231] Read of size 8 at addr ffff8801ba7b2af0 by task syzkaller301142/3654 [ 38.815232] [ 38.815237] CPU: 0 PID: 3654 Comm: syzkaller301142 Not tainted 4.15.0-rc7+ #171 [ 38.815239] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.815240] Call Trace: [ 38.815248] dump_stack+0x194/0x257 [ 38.815253] ? arch_local_irq_restore+0x53/0x53 [ 38.815258] ? show_regs_print_info+0x18/0x18 [ 38.815262] ? print_irqtrace_events+0x270/0x270 [ 38.815266] ? __lock_acquire+0x664/0x3e00 [ 38.815270] ? __lock_acquire+0x3d4d/0x3e00 [ 38.815275] print_address_description+0x73/0x250 [ 38.815279] ? __lock_acquire+0x3d4d/0x3e00 [ 38.815283] kasan_report+0x25b/0x340 [ 38.815288] __asan_report_load8_noabort+0x14/0x20 [ 38.815291] __lock_acquire+0x3d4d/0x3e00 [ 38.815295] ? __lock_acquire+0x664/0x3e00 [ 38.815298] ? lock_downgrade+0x980/0x980 [ 38.815301] ? lock_downgrade+0x980/0x980 [ 38.815305] ? print_irqtrace_events+0x270/0x270 [ 38.815311] ? remove_wait_queue+0x81/0x350 [ 38.815316] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.815320] ? __lock_acquire+0x664/0x3e00 [ 38.815324] ? check_noncircular+0x20/0x20 [ 38.815331] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.815335] ? lock_acquire+0x1d5/0x580 [ 38.815338] ? lock_acquire+0x1d5/0x580 [ 38.815343] ? ep_free+0xf4/0x320 [ 38.815348] ? lock_release+0xa40/0xa40 [ 38.815353] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.815356] ? print_irqtrace_events+0x270/0x270 [ 38.815359] ? print_irqtrace_events+0x270/0x270 [ 38.815365] ? rcu_note_context_switch+0x710/0x710 [ 38.815370] ? __might_sleep+0x95/0x190 [ 38.815373] ? ep_free+0xf4/0x320 [ 38.815378] ? __mutex_lock+0x16f/0x1a80 [ 38.815381] ? ep_free+0xf4/0x320 [ 38.815385] ? print_irqtrace_events+0x270/0x270 [ 38.815388] ? ep_free+0xf4/0x320 [ 38.815393] lock_acquire+0x1d5/0x580 [ 38.815396] ? lock_acquire+0x1d5/0x580 [ 38.815400] ? remove_wait_queue+0x81/0x350 [ 38.815405] ? lock_release+0xa40/0xa40 [ 38.815413] ? lock_acquire+0x1d5/0x580 [ 38.815418] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.815421] ? lock_acquire+0x1d5/0x580 [ 38.815427] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 38.815435] _raw_spin_lock_irqsave+0x96/0xc0 [ 38.815438] ? remove_wait_queue+0x81/0x350 [ 38.815442] remove_wait_queue+0x81/0x350 [ 38.815448] ? depot_save_stack+0x3b5/0x490 [ 38.815452] ? add_wait_queue+0x290/0x290 [ 38.815456] ? rcutorture_record_progress+0x10/0x10 [ 38.815459] ? lock_release+0xa40/0xa40 [ 38.815464] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 38.815471] ? __kernel_text_address+0xd/0x40 [ 38.815476] ? clear_tfile_check_list+0x370/0x370 [ 38.815480] ? check_noncircular+0x20/0x20 [ 38.815486] ? locks_remove_file+0x3fa/0x5a0 [ 38.815492] ep_free+0x13f/0x320 [ 38.815496] ? ep_remove+0x800/0x800 [ 38.815499] ? fsnotify_first_mark+0x2b0/0x2b0 [ 38.815504] ? ep_free+0x320/0x320 [ 38.815508] ep_eventpoll_release+0x44/0x60 [ 38.815512] __fput+0x327/0x7e0 [ 38.815517] ? fput+0x140/0x140 [ 38.815522] ? _raw_spin_unlock_irq+0x27/0x70 [ 38.815527] ____fput+0x15/0x20 [ 38.815531] task_work_run+0x199/0x270 [ 38.815535] ? task_work_cancel+0x210/0x210 [ 38.815540] ? _raw_spin_unlock+0x22/0x30 [ 38.815543] ? switch_task_namespaces+0x87/0xc0 [ 38.815550] do_exit+0x9bb/0x1ad0 [ 38.815555] ? __handle_mm_fault+0x2330/0x3ce0 [ 38.815560] ? mm_update_next_owner+0x930/0x930 [ 38.815566] ? do_raw_spin_trylock+0x190/0x190 [ 38.815570] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.815574] ? check_noncircular+0x20/0x20 [ 38.815578] ? _raw_spin_unlock+0x22/0x30 [ 38.815582] ? __handle_mm_fault+0x80e/0x3ce0 [ 38.815586] ? check_noncircular+0x20/0x20 [ 38.815590] ? __pmd_alloc+0x4e0/0x4e0 [ 38.815593] ? lock_downgrade+0x980/0x980 [ 38.815598] ? find_held_lock+0x35/0x1d0 [ 38.815603] ? handle_mm_fault+0x248/0x8d0 [ 38.815607] ? find_held_lock+0x35/0x1d0 [ 38.815614] ? __do_page_fault+0x5f7/0xc90 [ 38.815618] ? lock_downgrade+0x980/0x980 [ 38.815623] ? handle_mm_fault+0x410/0x8d0 [ 38.815626] ? down_read_trylock+0xdb/0x170 [ 38.815630] ? __do_page_fault+0x32d/0xc90 [ 38.815633] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 38.815638] ? vmacache_find+0x5f/0x280 [ 38.815643] do_group_exit+0x149/0x400 [ 38.815647] ? __do_page_fault+0x3d6/0xc90 [ 38.815650] ? SyS_exit+0x30/0x30 [ 38.815657] ? do_fast_syscall_32+0x156/0xf9d [ 38.815660] ? do_group_exit+0x400/0x400 [ 38.815664] SyS_exit_group+0x1d/0x20 [ 38.815668] do_fast_syscall_32+0x3ee/0xf9d [ 38.815673] ? do_int80_syscall_32+0x9d0/0x9d0 [ 38.815677] ? kasan_check_read+0x11/0x20 [ 38.815681] ? syscall_return_slowpath+0x550/0x550 [ 38.815686] ? SyS_rt_sigaction+0x94/0x1b0 [ 38.815690] ? SyS_sigprocmask+0x4b0/0x4b0 [ 38.815693] ? SyS_read+0x184/0x220 [ 38.815696] ? retint_user+0x18/0x18 [ 38.815701] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.815706] entry_SYSENTER_compat+0x54/0x63 [ 38.815711] RIP: 0023:0xf7f1ec79 [ 38.815713] RSP: 002b:00000000ffd9885c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 38.815717] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 38.815719] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 38.815721] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 38.815723] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 38.815725] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 38.815729] [ 38.815731] Allocated by task 3654: [ 38.815735] save_stack+0x43/0xd0 [ 38.815738] kasan_kmalloc+0xad/0xe0 [ 38.815741] kmem_cache_alloc_trace+0x136/0x750 [ 38.815747] binder_get_thread+0x1cf/0x870 [ 38.815750] binder_poll+0x8c/0x390 [ 38.815753] ep_item_poll.isra.10+0xec/0x320 [ 38.815756] ep_insert+0x6a3/0x1b10 [ 38.815760] SyS_epoll_ctl+0x12e4/0x1ab0 [ 38.815763] do_fast_syscall_32+0x3ee/0xf9d [ 38.815765] entry_SYSENTER_compat+0x54/0x63 [ 38.815766] [ 38.815768] Freed by task 3654: [ 38.815770] save_stack+0x43/0xd0 [ 38.815773] kasan_slab_free+0x71/0xc0 [ 38.815776] kfree+0xd6/0x260 [ 38.815779] binder_thread_dec_tmpref+0x27f/0x310 [ 38.815782] binder_thread_release+0x27d/0x540 [ 38.815786] binder_ioctl+0xc02/0x1417 [ 38.815789] compat_SyS_ioctl+0x151/0x2a30 [ 38.815792] do_fast_syscall_32+0x3ee/0xf9d [ 38.815795] entry_SYSENTER_compat+0x54/0x63 [ 38.815796] [ 38.815798] The buggy address belongs to the object at ffff8801ba7b2a40 [ 38.815798] which belongs to the cache kmalloc-512 of size 512 [ 38.815801] The buggy address is located 176 bytes inside of [ 38.815801] 512-byte region [ffff8801ba7b2a40, ffff8801ba7b2c40) [ 38.815802] The buggy address belongs to the page: [ 38.815805] page:ffffea0006e9ec80 count:1 mapcount:0 mapping:ffff8801ba7b2040 index:0x0 [ 38.815809] flags: 0x2fffc0000000100(slab) [ 38.815815] raw: 02fffc0000000100 ffff8801ba7b2040 0000000000000000 0000000100000006 [ 38.815819] raw: ffffea0006e929e0 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 38.815821] page dumped because: kasan: bad access detected [ 38.815821] [ 38.815822] Memory state around the buggy address: [ 38.815825] ffff8801ba7b2980: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 38.815828] ffff8801ba7b2a00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 38.815830] >ffff8801ba7b2a80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.815832] ^ [ 38.815834] ffff8801ba7b2b00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.815837] ffff8801ba7b2b80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 38.815838] ================================================================== [ 38.815839] Disabling lock debugging due to kernel taint [ 38.815842] Kernel panic - not syncing: panic_on_warn set ... [ 38.815842] [ 38.815846] CPU: 0 PID: 3654 Comm: syzkaller301142 Tainted: G B 4.15.0-rc7+ #171 [ 38.815848] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 38.815848] Call Trace: [ 38.815853] dump_stack+0x194/0x257 [ 38.815857] ? arch_local_irq_restore+0x53/0x53 [ 38.815861] ? kasan_end_report+0x32/0x50 [ 38.815864] ? lock_downgrade+0x980/0x980 [ 38.815870] ? vsnprintf+0x1ed/0x1900 [ 38.815873] ? __lock_acquire+0x3cb0/0x3e00 [ 38.815877] panic+0x1e4/0x41c [ 38.815880] ? refcount_error_report+0x214/0x214 [ 38.815884] ? add_taint+0x40/0x50 [ 38.815887] ? add_taint+0x1c/0x50 [ 38.815891] ? __lock_acquire+0x3d4d/0x3e00 [ 38.815895] kasan_end_report+0x50/0x50 [ 38.815898] kasan_report+0x144/0x340 [ 38.815903] __asan_report_load8_noabort+0x14/0x20 [ 38.815907] __lock_acquire+0x3d4d/0x3e00 [ 38.815910] ? __lock_acquire+0x664/0x3e00 [ 38.815914] ? lock_downgrade+0x980/0x980 [ 38.815917] ? lock_downgrade+0x980/0x980 [ 38.815921] ? print_irqtrace_events+0x270/0x270 [ 38.815924] ? remove_wait_queue+0x81/0x350 [ 38.815929] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.815935] ? __lock_acquire+0x664/0x3e00 [ 38.815938] ? check_noncircular+0x20/0x20 [ 38.815945] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.815949] ? lock_acquire+0x1d5/0x580 [ 38.815952] ? lock_acquire+0x1d5/0x580 [ 38.815956] ? ep_free+0xf4/0x320 [ 38.815962] ? lock_release+0xa40/0xa40 [ 38.815965] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.815969] ? print_irqtrace_events+0x270/0x270 [ 38.815972] ? print_irqtrace_events+0x270/0x270 [ 38.815976] ? rcu_note_context_switch+0x710/0x710 [ 38.815985] ? __might_sleep+0x95/0x190 [ 38.815989] ? ep_free+0xf4/0x320 [ 38.815992] ? __mutex_lock+0x16f/0x1a80 [ 38.815995] ? ep_free+0xf4/0x320 [ 38.815999] ? print_irqtrace_events+0x270/0x270 [ 38.816005] ? ep_free+0xf4/0x320 [ 38.816010] lock_acquire+0x1d5/0x580 [ 38.816014] ? lock_acquire+0x1d5/0x580 [ 38.816017] ? remove_wait_queue+0x81/0x350 [ 38.816022] ? lock_release+0xa40/0xa40 [ 38.816027] ? lock_acquire+0x1d5/0x580 [ 38.816030] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 38.816033] ? lock_acquire+0x1d5/0x580 [ 38.816037] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 38.816041] _raw_spin_lock_irqsave+0x96/0xc0 [ 38.816045] ? remove_wait_queue+0x81/0x350 [ 38.816049] remove_wait_queue+0x81/0x350 [ 38.816052] ? depot_save_stack+0x3b5/0x490 [ 38.816056] ? add_wait_queue+0x290/0x290 [ 38.816060] ? rcutorture_record_progress+0x10/0x10 [ 38.816063] ? lock_release+0xa40/0xa40 [ 38.816068] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 38.816072] ? __kernel_text_address+0xd/0x40 [ 38.816077] ? clear_tfile_check_list+0x370/0x370 [ 38.816082] ? check_noncircular+0x20/0x20 [ 38.816086] ? locks_remove_file+0x3fa/0x5a0 [ 38.816091] ep_free+0x13f/0x320 [ 38.816095] ? ep_remove+0x800/0x800 [ 38.816098] ? fsnotify_first_mark+0x2b0/0x2b0 [ 38.816103] ? ep_free+0x320/0x320 [ 38.816106] ep_eventpoll_release+0x44/0x60 [ 38.816110] __fput+0x327/0x7e0 [ 38.816115] ? fput+0x140/0x140 [ 38.816119] ? _raw_spin_unlock_irq+0x27/0x70 [ 38.816124] ____fput+0x15/0x20 [ 38.816128] task_work_run+0x199/0x270 [ 38.816132] ? task_work_cancel+0x210/0x210 [ 38.816136] ? _raw_spin_unlock+0x22/0x30 [ 38.816140] ? switch_task_namespaces+0x87/0xc0 [ 38.816144] do_exit+0x9bb/0x1ad0 [ 38.816148] ? __handle_mm_fault+0x2330/0x3ce0 [ 38.816152] ? mm_update_next_owner+0x930/0x930 [ 38.816157] ? do_raw_spin_trylock+0x190/0x190 [ 38.816162] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 38.816165] ? check_noncircular+0x20/0x20 [ 38.816169] ? _raw_spin_unlock+0x22/0x30 [ 38.816173] ? __handle_mm_fault+0x80e/0x3ce0 [ 38.816178] ? check_noncircular+0x20/0x20 [ 38.816180] ? __pmd_alloc+0x4e0/0x4e0 [ 38.816184] ? lock_downgrade+0x980/0x980 [ 38.816188] ? find_held_lock+0x35/0x1d0 [ 38.816193] ? handle_mm_fault+0x248/0x8d0 [ 38.816197] ? find_held_lock+0x35/0x1d0 [ 38.816202] ? __do_page_fault+0x5f7/0xc90 [ 38.816206] ? lock_downgrade+0x980/0x980 [ 38.816211] ? handle_mm_fault+0x410/0x8d0 [ 38.816214] ? down_read_trylock+0xdb/0x170 [ 38.816217] ? __do_page_fault+0x32d/0xc90 [ 38.816221] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 38.816224] ? vmacache_find+0x5f/0x280 [ 38.816229] do_group_exit+0x149/0x400 [ 38.816233] ? __do_page_fault+0x3d6/0xc90 [ 38.816237] ? SyS_exit+0x30/0x30 [ 38.816241] ? do_fast_syscall_32+0x156/0xf9d [ 38.816244] ? do_group_exit+0x400/0x400 [ 38.816248] SyS_exit_group+0x1d/0x20 [ 38.816252] do_fast_syscall_32+0x3ee/0xf9d [ 38.816257] ? do_int80_syscall_32+0x9d0/0x9d0 [ 38.816260] ? kasan_check_read+0x11/0x20 [ 38.816264] ? syscall_return_slowpath+0x550/0x550 [ 38.816268] ? SyS_rt_sigaction+0x94/0x1b0 [ 38.816272] ? SyS_sigprocmask+0x4b0/0x4b0 [ 38.816275] ? SyS_read+0x184/0x220 [ 38.816279] ? retint_user+0x18/0x18 [ 38.816283] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 38.816288] entry_SYSENTER_compat+0x54/0x63 [ 38.816290] RIP: 0023:0xf7f1ec79 [ 38.816292] RSP: 002b:00000000ffd9885c EFLAGS: 00000296 ORIG_RAX: 00000000000000fc [ 38.816296] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 38.816298] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 38.816299] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 38.816301] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 38.816303] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 38.837306] Dumping ftrace buffer: [ 38.837309] (ftrace buffer empty) [ 38.837312] Kernel Offset: disabled [ 40.121053] Rebooting in 86400 seconds..