[....] Starting enhanced syslogd: rsyslogd[ 13.381824] audit: type=1400 audit(1516087565.318:5): 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 periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. Starting mcstransd: [....] 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: [ 18.314358] audit: type=1400 audit(1516087570.251:6): 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 '10.128.0.15' (ECDSA) to the list of known hosts. executing program [ 24.547512] audit: type=1400 audit(1516087576.484:7): avc: denied { map } for pid=3651 comm="syzkaller275517" path="/root/syzkaller275517910" 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 [ 24.552264] ================================================================== [ 24.552278] BUG: KASAN: use-after-free in __lock_acquire+0x3d4d/0x3e00 [ 24.552284] Read of size 8 at addr ffff8801bc25ddf0 by task syzkaller275517/3651 [ 24.552285] [ 24.552292] CPU: 1 PID: 3651 Comm: syzkaller275517 Not tainted 4.15.0-rc8+ #173 [ 24.552295] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.552297] Call Trace: [ 24.552308] dump_stack+0x194/0x257 [ 24.552316] ? arch_local_irq_restore+0x53/0x53 [ 24.552323] ? show_regs_print_info+0x18/0x18 [ 24.552329] ? print_irqtrace_events+0x270/0x270 [ 24.552335] ? __lock_acquire+0x664/0x3e00 [ 24.552342] ? __lock_acquire+0x3d4d/0x3e00 [ 24.552350] print_address_description+0x73/0x250 [ 24.552356] ? __lock_acquire+0x3d4d/0x3e00 [ 24.552362] kasan_report+0x25b/0x340 [ 24.552370] __asan_report_load8_noabort+0x14/0x20 [ 24.552376] __lock_acquire+0x3d4d/0x3e00 [ 24.552382] ? __lock_acquire+0x664/0x3e00 [ 24.552388] ? lock_downgrade+0x980/0x980 [ 24.552393] ? lock_downgrade+0x980/0x980 [ 24.552400] ? print_irqtrace_events+0x270/0x270 [ 24.552407] ? remove_wait_queue+0x81/0x350 [ 24.552416] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.552423] ? __lock_acquire+0x664/0x3e00 [ 24.552428] ? check_noncircular+0x20/0x20 [ 24.552441] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.552448] ? lock_acquire+0x1d5/0x580 [ 24.552453] ? lock_acquire+0x1d5/0x580 [ 24.552461] ? ep_free+0xf4/0x320 [ 24.552470] ? lock_release+0xa40/0xa40 [ 24.552477] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.552482] ? print_irqtrace_events+0x270/0x270 [ 24.552488] ? print_irqtrace_events+0x270/0x270 [ 24.552496] ? rcu_note_context_switch+0x710/0x710 [ 24.552503] ? __might_sleep+0x95/0x190 [ 24.552509] ? ep_free+0xf4/0x320 [ 24.552516] ? __mutex_lock+0x16f/0x1a80 [ 24.552521] ? ep_free+0xf4/0x320 [ 24.552528] ? print_irqtrace_events+0x270/0x270 [ 24.552533] ? ep_free+0xf4/0x320 [ 24.552541] lock_acquire+0x1d5/0x580 [ 24.552547] ? lock_acquire+0x1d5/0x580 [ 24.552552] ? remove_wait_queue+0x81/0x350 [ 24.552560] ? lock_release+0xa40/0xa40 [ 24.552570] ? lock_acquire+0x1d5/0x580 [ 24.552575] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.552580] ? lock_acquire+0x1d5/0x580 [ 24.552587] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 24.552595] _raw_spin_lock_irqsave+0x96/0xc0 [ 24.552600] ? remove_wait_queue+0x81/0x350 [ 24.552607] remove_wait_queue+0x81/0x350 [ 24.552614] ? depot_save_stack+0x3b5/0x490 [ 24.552621] ? add_wait_queue+0x290/0x290 [ 24.552627] ? rcutorture_record_progress+0x10/0x10 [ 24.552632] ? lock_release+0xa40/0xa40 [ 24.552642] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 24.552649] ? __kernel_text_address+0xd/0x40 [ 24.552657] ? clear_tfile_check_list+0x370/0x370 [ 24.552665] ? check_noncircular+0x20/0x20 [ 24.552673] ? locks_remove_file+0x3fa/0x5a0 [ 24.552682] ep_free+0x13f/0x320 [ 24.552689] ? ep_remove+0x800/0x800 [ 24.552694] ? fsnotify_first_mark+0x2b0/0x2b0 [ 24.552702] ? ep_free+0x320/0x320 [ 24.552708] ep_eventpoll_release+0x44/0x60 [ 24.552715] __fput+0x327/0x7e0 [ 24.552724] ? fput+0x140/0x140 [ 24.552731] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.552739] ____fput+0x15/0x20 [ 24.552745] task_work_run+0x199/0x270 [ 24.552753] ? task_work_cancel+0x210/0x210 [ 24.552760] ? _raw_spin_unlock+0x22/0x30 [ 24.552766] ? switch_task_namespaces+0x87/0xc0 [ 24.552775] do_exit+0x9bb/0x1ad0 [ 24.552782] ? __handle_mm_fault+0x2330/0x3ce0 [ 24.552789] ? mm_update_next_owner+0x930/0x930 [ 24.552799] ? do_raw_spin_trylock+0x190/0x190 [ 24.552806] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.552812] ? check_noncircular+0x20/0x20 [ 24.552820] ? _raw_spin_unlock+0x22/0x30 [ 24.552826] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.552834] ? check_noncircular+0x20/0x20 [ 24.552838] ? __pmd_alloc+0x4e0/0x4e0 [ 24.552844] ? lock_downgrade+0x980/0x980 [ 24.552852] ? find_held_lock+0x35/0x1d0 [ 24.552860] ? handle_mm_fault+0x248/0x8d0 [ 24.552867] ? find_held_lock+0x35/0x1d0 [ 24.552877] ? __do_page_fault+0x5f7/0xc90 [ 24.552883] ? lock_downgrade+0x980/0x980 [ 24.552892] ? handle_mm_fault+0x410/0x8d0 [ 24.552897] ? down_read_trylock+0xdb/0x170 [ 24.552903] ? __do_page_fault+0x32d/0xc90 [ 24.552909] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 24.552915] ? vmacache_find+0x5f/0x280 [ 24.552924] do_group_exit+0x149/0x400 [ 24.552931] ? __do_page_fault+0x3d6/0xc90 [ 24.552936] ? SyS_exit+0x30/0x30 [ 24.552945] ? do_fast_syscall_32+0x156/0xf9d [ 24.552951] ? do_group_exit+0x400/0x400 [ 24.552958] SyS_exit_group+0x1d/0x20 [ 24.552964] do_fast_syscall_32+0x3ee/0xf9d [ 24.552972] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.552978] ? kasan_check_read+0x11/0x20 [ 24.552985] ? syscall_return_slowpath+0x550/0x550 [ 24.552992] ? SyS_rt_sigaction+0x94/0x1b0 [ 24.552999] ? SyS_sigprocmask+0x4b0/0x4b0 [ 24.553008] ? SyS_read+0x184/0x220 [ 24.553014] ? retint_user+0x18/0x18 [ 24.553022] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.553035] entry_SYSENTER_compat+0x54/0x63 [ 24.553040] RIP: 0023:0xf7fb1c79 [ 24.553043] RSP: 002b:00000000ff85efdc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 24.553050] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 24.553053] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 24.553056] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 24.553059] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.553063] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.553071] [ 24.553074] Allocated by task 3651: [ 24.553080] save_stack+0x43/0xd0 [ 24.553085] kasan_kmalloc+0xad/0xe0 [ 24.553090] kmem_cache_alloc_trace+0x136/0x750 [ 24.553097] binder_get_thread+0x1cf/0x870 [ 24.553102] binder_poll+0x8c/0x390 [ 24.553107] ep_item_poll.isra.10+0xec/0x320 [ 24.553112] ep_insert+0x6a3/0x1b10 [ 24.553117] SyS_epoll_ctl+0x12e4/0x1ab0 [ 24.553122] do_fast_syscall_32+0x3ee/0xf9d [ 24.553127] entry_SYSENTER_compat+0x54/0x63 [ 24.553128] [ 24.553130] Freed by task 3651: [ 24.553134] save_stack+0x43/0xd0 [ 24.553139] kasan_slab_free+0x71/0xc0 [ 24.553143] kfree+0xd6/0x260 [ 24.553148] binder_thread_dec_tmpref+0x27f/0x310 [ 24.553154] binder_thread_release+0x27d/0x540 [ 24.553159] binder_ioctl+0xc02/0x1417 [ 24.553164] compat_SyS_ioctl+0x151/0x2a30 [ 24.553169] do_fast_syscall_32+0x3ee/0xf9d [ 24.553174] entry_SYSENTER_compat+0x54/0x63 [ 24.553175] [ 24.553179] The buggy address belongs to the object at ffff8801bc25dd40 [ 24.553179] which belongs to the cache kmalloc-512 of size 512 [ 24.553184] The buggy address is located 176 bytes inside of [ 24.553184] 512-byte region [ffff8801bc25dd40, ffff8801bc25df40) [ 24.553186] The buggy address belongs to the page: [ 24.553190] page:ffffea0006f09740 count:1 mapcount:0 mapping:ffff8801bc25d0c0 index:0x0 [ 24.553196] flags: 0x2fffc0000000100(slab) [ 24.553204] raw: 02fffc0000000100 ffff8801bc25d0c0 0000000000000000 0000000100000006 [ 24.553211] raw: ffffea0006f0fd20 ffff8801dac01748 ffff8801dac00940 0000000000000000 [ 24.553213] page dumped because: kasan: bad access detected [ 24.553214] [ 24.553216] Memory state around the buggy address: [ 24.553221] ffff8801bc25dc80: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc [ 24.553225] ffff8801bc25dd00: fc fc fc fc fc fc fc fc fb fb fb fb fb fb fb fb [ 24.553229] >ffff8801bc25dd80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.553231] ^ [ 24.553236] ffff8801bc25de00: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.553240] ffff8801bc25de80: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb [ 24.553242] ================================================================== [ 24.553243] Disabling lock debugging due to kernel taint [ 24.553246] Kernel panic - not syncing: panic_on_warn set ... [ 24.553246] [ 24.553252] CPU: 1 PID: 3651 Comm: syzkaller275517 Tainted: G B 4.15.0-rc8+ #173 [ 24.553255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 24.553257] Call Trace: [ 24.553263] dump_stack+0x194/0x257 [ 24.553271] ? arch_local_irq_restore+0x53/0x53 [ 24.553276] ? kasan_end_report+0x32/0x50 [ 24.553282] ? lock_downgrade+0x980/0x980 [ 24.553288] ? vsnprintf+0x1ed/0x1900 [ 24.553295] ? __lock_acquire+0x3c70/0x3e00 [ 24.553300] panic+0x1e4/0x41c [ 24.553306] ? refcount_error_report+0x214/0x214 [ 24.553313] ? add_taint+0x40/0x50 [ 24.553318] ? add_taint+0x1c/0x50 [ 24.553325] ? __lock_acquire+0x3d4d/0x3e00 [ 24.553331] kasan_end_report+0x50/0x50 [ 24.553337] kasan_report+0x144/0x340 [ 24.553345] __asan_report_load8_noabort+0x14/0x20 [ 24.553350] __lock_acquire+0x3d4d/0x3e00 [ 24.553356] ? __lock_acquire+0x664/0x3e00 [ 24.553362] ? lock_downgrade+0x980/0x980 [ 24.553367] ? lock_downgrade+0x980/0x980 [ 24.553373] ? print_irqtrace_events+0x270/0x270 [ 24.553379] ? remove_wait_queue+0x81/0x350 [ 24.553388] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.553394] ? __lock_acquire+0x664/0x3e00 [ 24.553400] ? check_noncircular+0x20/0x20 [ 24.553411] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.553418] ? lock_acquire+0x1d5/0x580 [ 24.553424] ? lock_acquire+0x1d5/0x580 [ 24.553429] ? ep_free+0xf4/0x320 [ 24.553437] ? lock_release+0xa40/0xa40 [ 24.553443] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.553449] ? print_irqtrace_events+0x270/0x270 [ 24.553454] ? print_irqtrace_events+0x270/0x270 [ 24.553460] ? rcu_note_context_switch+0x710/0x710 [ 24.553467] ? __might_sleep+0x95/0x190 [ 24.553473] ? ep_free+0xf4/0x320 [ 24.553479] ? __mutex_lock+0x16f/0x1a80 [ 24.553484] ? ep_free+0xf4/0x320 [ 24.553491] ? print_irqtrace_events+0x270/0x270 [ 24.553496] ? ep_free+0xf4/0x320 [ 24.553504] lock_acquire+0x1d5/0x580 [ 24.553510] ? lock_acquire+0x1d5/0x580 [ 24.553516] ? remove_wait_queue+0x81/0x350 [ 24.553524] ? lock_release+0xa40/0xa40 [ 24.553532] ? lock_acquire+0x1d5/0x580 [ 24.553538] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 24.553543] ? lock_acquire+0x1d5/0x580 [ 24.553549] ? ep_unregister_pollwait.isra.7+0x323/0x590 [ 24.553557] _raw_spin_lock_irqsave+0x96/0xc0 [ 24.553562] ? remove_wait_queue+0x81/0x350 [ 24.553569] remove_wait_queue+0x81/0x350 [ 24.553575] ? depot_save_stack+0x3b5/0x490 [ 24.553581] ? add_wait_queue+0x290/0x290 [ 24.553587] ? rcutorture_record_progress+0x10/0x10 [ 24.553593] ? lock_release+0xa40/0xa40 [ 24.553602] ep_unregister_pollwait.isra.7+0x18c/0x590 [ 24.553609] ? __kernel_text_address+0xd/0x40 [ 24.553617] ? clear_tfile_check_list+0x370/0x370 [ 24.553624] ? check_noncircular+0x20/0x20 [ 24.553632] ? locks_remove_file+0x3fa/0x5a0 [ 24.553641] ep_free+0x13f/0x320 [ 24.553647] ? ep_remove+0x800/0x800 [ 24.553652] ? fsnotify_first_mark+0x2b0/0x2b0 [ 24.553660] ? ep_free+0x320/0x320 [ 24.553666] ep_eventpoll_release+0x44/0x60 [ 24.553672] __fput+0x327/0x7e0 [ 24.553681] ? fput+0x140/0x140 [ 24.553687] ? _raw_spin_unlock_irq+0x27/0x70 [ 24.553696] ____fput+0x15/0x20 [ 24.553702] task_work_run+0x199/0x270 [ 24.553709] ? task_work_cancel+0x210/0x210 [ 24.553716] ? _raw_spin_unlock+0x22/0x30 [ 24.553722] ? switch_task_namespaces+0x87/0xc0 [ 24.553729] do_exit+0x9bb/0x1ad0 [ 24.553735] ? __handle_mm_fault+0x2330/0x3ce0 [ 24.553742] ? mm_update_next_owner+0x930/0x930 [ 24.553751] ? do_raw_spin_trylock+0x190/0x190 [ 24.553758] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 24.553764] ? check_noncircular+0x20/0x20 [ 24.553771] ? _raw_spin_unlock+0x22/0x30 [ 24.553778] ? __handle_mm_fault+0x80e/0x3ce0 [ 24.553785] ? check_noncircular+0x20/0x20 [ 24.553790] ? __pmd_alloc+0x4e0/0x4e0 [ 24.553795] ? lock_downgrade+0x980/0x980 [ 24.553803] ? find_held_lock+0x35/0x1d0 [ 24.553812] ? handle_mm_fault+0x248/0x8d0 [ 24.553818] ? find_held_lock+0x35/0x1d0 [ 24.553827] ? __do_page_fault+0x5f7/0xc90 [ 24.553833] ? lock_downgrade+0x980/0x980 [ 24.553842] ? handle_mm_fault+0x410/0x8d0 [ 24.553847] ? down_read_trylock+0xdb/0x170 [ 24.553852] ? __do_page_fault+0x32d/0xc90 [ 24.553859] ? __handle_mm_fault+0x3ce0/0x3ce0 [ 24.553864] ? vmacache_find+0x5f/0x280 [ 24.553872] do_group_exit+0x149/0x400 [ 24.553878] ? __do_page_fault+0x3d6/0xc90 [ 24.553884] ? SyS_exit+0x30/0x30 [ 24.553891] ? do_fast_syscall_32+0x156/0xf9d [ 24.553897] ? do_group_exit+0x400/0x400 [ 24.553904] SyS_exit_group+0x1d/0x20 [ 24.553910] do_fast_syscall_32+0x3ee/0xf9d [ 24.553918] ? do_int80_syscall_32+0x9d0/0x9d0 [ 24.553924] ? kasan_check_read+0x11/0x20 [ 24.553931] ? syscall_return_slowpath+0x550/0x550 [ 24.553937] ? SyS_rt_sigaction+0x94/0x1b0 [ 24.553944] ? SyS_sigprocmask+0x4b0/0x4b0 [ 24.553949] ? SyS_read+0x184/0x220 [ 24.553954] ? retint_user+0x18/0x18 [ 24.553962] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 24.553970] entry_SYSENTER_compat+0x54/0x63 [ 24.553974] RIP: 0023:0xf7fb1c79 [ 24.553977] RSP: 002b:00000000ff85efdc EFLAGS: 00000292 ORIG_RAX: 00000000000000fc [ 24.553982] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 00000000080f0298 [ 24.553986] RDX: 0000000000000000 RSI: 00000000080d9ad8 RDI: 00000000080f02a0 [ 24.553989] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000 [ 24.553992] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 24.553995] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 24.573848] Dumping ftrace buffer: [ 24.573851] (ftrace buffer empty) [ 24.573854] Kernel Offset: disabled [ 25.857462] Rebooting in 86400 seconds..