[....] Starting enhanced syslogd: rsyslogd[ 16.299286] audit: type=1400 audit(1517330917.971:5): avc: denied { syslog } for pid=4007 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 file context maintaining daemon: restorecond[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 syzkaller login: [ 22.286527] audit: type=1400 audit(1517330923.958:6): avc: denied { map } for pid=4146 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 '10.128.0.42' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 50.447492] audit: type=1400 audit(1517330952.119:7): avc: denied { map } for pid=4162 comm="syzkaller941916" path="/root/syzkaller941916324" 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 executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program [ 53.600634] ================================================================== [ 53.608051] BUG: KASAN: use-after-free in perf_trace_lock_acquire+0x5b7/0x980 [ 53.615313] Read of size 8 at addr ffff8801b32280b8 by task syzkaller941916/6287 [ 53.622830] [ 53.624450] CPU: 1 PID: 6287 Comm: syzkaller941916 Not tainted 4.15.0+ #196 [ 53.631531] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.640871] Call Trace: [ 53.643445] dump_stack+0x194/0x257 [ 53.647061] ? arch_local_irq_restore+0x53/0x53 [ 53.651715] ? show_regs_print_info+0x18/0x18 [ 53.656281] ? perf_trace_lock_acquire+0x5b7/0x980 [ 53.661187] print_address_description+0x73/0x250 [ 53.666010] ? perf_trace_lock_acquire+0x5b7/0x980 [ 53.670920] kasan_report+0x25b/0x340 [ 53.674695] __asan_report_load8_noabort+0x14/0x20 [ 53.679593] perf_trace_lock_acquire+0x5b7/0x980 [ 53.684322] ? lock_release+0xa40/0xa40 [ 53.688267] ? usleep_range+0x190/0x190 [ 53.692211] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 53.698074] ? perf_trace_lock+0x900/0x900 [ 53.702279] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.706747] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.711731] ? trace_hardirqs_on+0xd/0x10 [ 53.715861] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.720333] ? wait_for_completion+0xe0/0x770 [ 53.724807] ? wait_for_completion_interruptible+0x7e0/0x7e0 [ 53.730573] ? __lockdep_init_map+0xe4/0x650 [ 53.734963] ? llist_add_batch+0xf3/0x180 [ 53.739081] ? find_last_bit+0xd0/0xd0 [ 53.742943] lock_acquire+0x394/0x580 [ 53.746715] ? remove_wait_queue+0x81/0x350 [ 53.751007] ? lock_release+0xa40/0xa40 [ 53.754963] ? vhost_work_queue+0xc0/0xc0 [ 53.759090] ? vhost_poll_stop+0x90/0x90 [ 53.763125] ? wait_for_completion+0x770/0x770 [ 53.767681] _raw_spin_lock_irqsave+0x96/0xc0 [ 53.772156] ? remove_wait_queue+0x81/0x350 [ 53.776940] remove_wait_queue+0x81/0x350 [ 53.781064] ? add_wait_queue+0x290/0x290 [ 53.785185] ? vhost_poll_flush+0x3f/0x60 [ 53.789305] ? vhost_net_flush+0x209/0x2a0 [ 53.793512] vhost_dev_stop+0x15c/0x2a0 [ 53.797458] ? vhost_net_compat_ioctl+0x30/0x30 [ 53.802096] vhost_net_release+0x6e/0x190 [ 53.806213] __fput+0x327/0x7e0 [ 53.809462] ? fput+0x140/0x140 [ 53.812711] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 53.818563] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.823035] ____fput+0x15/0x20 [ 53.826286] task_work_run+0x199/0x270 [ 53.830143] ? task_work_cancel+0x210/0x210 [ 53.834433] ? _raw_spin_unlock+0x22/0x30 [ 53.838559] ? switch_task_namespaces+0x87/0xc0 [ 53.843207] do_exit+0x9bb/0x1ad0 [ 53.846636] ? mm_update_next_owner+0x930/0x930 [ 53.851282] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 53.856441] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 53.861599] ? lock_acquire+0x1d5/0x580 [ 53.865559] ? __lock_is_held+0xb6/0x140 [ 53.869592] ? perf_trace_lock_acquire+0xe3/0x980 [ 53.874406] ? perf_trace_lock_acquire+0xe3/0x980 [ 53.879224] ? perf_trace_lock+0x900/0x900 [ 53.883436] ? check_noncircular+0x20/0x20 [ 53.887645] ? perf_event_sync_stat+0x5b0/0x5b0 [ 53.892285] ? __perf_event_task_sched_in+0x200/0xc20 [ 53.897449] ? find_held_lock+0x35/0x1d0 [ 53.901482] ? get_signal+0x7ae/0x16c0 [ 53.905338] ? lock_downgrade+0x980/0x980 [ 53.909459] do_group_exit+0x149/0x400 [ 53.913324] ? do_raw_spin_trylock+0x190/0x190 [ 53.917883] ? SyS_exit+0x30/0x30 [ 53.921307] ? _raw_spin_unlock_irq+0x27/0x70 [ 53.925773] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 53.930761] get_signal+0x73f/0x16c0 [ 53.934450] ? ptrace_notify+0x130/0x130 [ 53.938481] ? __schedule+0x8f3/0x2060 [ 53.942356] ? __sched_text_start+0x8/0x8 [ 53.946481] ? vhost_net_ioctl+0x2af/0x1910 [ 53.950784] do_signal+0x90/0x1eb0 [ 53.954313] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 53.960170] ? rcu_note_context_switch+0x710/0x710 [ 53.965078] ? setup_sigcontext+0x7d0/0x7d0 [ 53.969378] ? __might_sleep+0x95/0x190 [ 53.973332] ? schedule+0xf5/0x430 [ 53.976841] ? __schedule+0x2060/0x2060 [ 53.980793] ? selinux_capable+0x40/0x40 [ 53.984833] ? exit_to_usermode_loop+0x8c/0x310 [ 53.989478] exit_to_usermode_loop+0x214/0x310 [ 53.994036] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 53.999548] ? lock_downgrade+0x980/0x980 [ 54.003665] ? do_fast_syscall_32+0x156/0xf9d [ 54.008132] do_fast_syscall_32+0xbfd/0xf9d [ 54.012426] ? do_raw_spin_trylock+0x190/0x190 [ 54.016978] ? do_int80_syscall_32+0x9d0/0x9d0 [ 54.021532] ? syscall_return_slowpath+0x2ad/0x550 [ 54.026433] ? prepare_exit_to_usermode+0x340/0x340 [ 54.031418] ? sysret32_from_system_call+0x5/0x3b [ 54.036229] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.041045] entry_SYSENTER_compat+0x54/0x63 [ 54.045423] RIP: 0023:0xf7feec79 [ 54.048756] RSP: 002b:00000000f7f8713c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 [ 54.056433] RAX: 0000000000000001 RBX: 0000000008100f94 RCX: 0000000000000001 [ 54.063673] RDX: 0000000008049815 RSI: 0000000000000000 RDI: 0000000000000000 [ 54.070915] RBP: 00000000003d0f00 R08: 0000000000000000 R09: 0000000000000000 [ 54.078157] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 54.085399] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 54.092648] [ 54.094254] Allocated by task 6259: [ 54.097856] save_stack+0x43/0xd0 [ 54.101280] kasan_kmalloc+0xad/0xe0 [ 54.104964] kmem_cache_alloc_trace+0x136/0x750 [ 54.109603] eventfd_file_create.part.3+0x96/0x250 [ 54.114502] SyS_eventfd+0x2c/0x80 [ 54.118014] do_fast_syscall_32+0x3ee/0xf9d [ 54.122319] entry_SYSENTER_compat+0x54/0x63 [ 54.126700] [ 54.128303] Freed by task 6287: [ 54.131548] save_stack+0x43/0xd0 [ 54.134968] kasan_slab_free+0x71/0xc0 [ 54.138825] kfree+0xd6/0x260 [ 54.141907] eventfd_ctx_put+0x26/0x30 [ 54.145760] eventfd_release+0x52/0x60 [ 54.149616] __fput+0x327/0x7e0 [ 54.152863] ____fput+0x15/0x20 [ 54.156111] task_work_run+0x199/0x270 [ 54.159969] do_exit+0x9bb/0x1ad0 [ 54.163389] do_group_exit+0x149/0x400 [ 54.167245] get_signal+0x73f/0x16c0 [ 54.170927] do_signal+0x90/0x1eb0 [ 54.174437] exit_to_usermode_loop+0x214/0x310 [ 54.178992] do_fast_syscall_32+0xbfd/0xf9d [ 54.183285] entry_SYSENTER_compat+0x54/0x63 [ 54.187658] [ 54.189254] The buggy address belongs to the object at ffff8801b3228080 [ 54.189254] which belongs to the cache kmalloc-96 of size 96 [ 54.201703] The buggy address is located 56 bytes inside of [ 54.201703] 96-byte region [ffff8801b3228080, ffff8801b32280e0) [ 54.213368] The buggy address belongs to the page: [ 54.218266] page:ffffea0006cc8a00 count:1 mapcount:0 mapping:ffff8801b3228000 index:0x0 [ 54.226374] flags: 0x2fffc0000000100(slab) [ 54.230582] raw: 02fffc0000000100 ffff8801b3228000 0000000000000000 0000000100000020 [ 54.238430] raw: ffffea0006dcab20 ffffea0006cbb1e0 ffff8801db0004c0 0000000000000000 [ 54.246277] page dumped because: kasan: bad access detected [ 54.251950] [ 54.253543] Memory state around the buggy address: [ 54.258440] ffff8801b3227f80: ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff ff [ 54.265764] ffff8801b3228000: 00 00 00 00 00 00 00 00 00 00 00 00 fc fc fc fc [ 54.273095] >ffff8801b3228080: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 54.280424] ^ [ 54.285583] ffff8801b3228100: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 54.292910] ffff8801b3228180: fb fb fb fb fb fb fb fb fb fb fb fb fc fc fc fc [ 54.300236] ================================================================== [ 54.307561] Disabling lock debugging due to kernel taint [ 54.312978] Kernel panic - not syncing: panic_on_warn set ... [ 54.312978] [ 54.320314] CPU: 1 PID: 6287 Comm: syzkaller941916 Tainted: G B 4.15.0+ #196 [ 54.328680] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.338001] Call Trace: [ 54.340572] dump_stack+0x194/0x257 [ 54.344169] ? arch_local_irq_restore+0x53/0x53 [ 54.348805] ? kasan_end_report+0x32/0x50 [ 54.352922] ? lock_downgrade+0x980/0x980 [ 54.357041] ? vsnprintf+0x1ed/0x1900 [ 54.360813] ? perf_trace_lock_acquire+0x5a0/0x980 [ 54.365712] panic+0x1e4/0x41c [ 54.368877] ? refcount_error_report+0x214/0x214 [ 54.373610] ? add_taint+0x40/0x50 [ 54.377121] ? add_taint+0x1c/0x50 [ 54.380632] ? perf_trace_lock_acquire+0x5b7/0x980 [ 54.385528] kasan_end_report+0x50/0x50 [ 54.389478] kasan_report+0x144/0x340 [ 54.393255] __asan_report_load8_noabort+0x14/0x20 [ 54.398157] perf_trace_lock_acquire+0x5b7/0x980 [ 54.402885] ? lock_release+0xa40/0xa40 [ 54.406832] ? usleep_range+0x190/0x190 [ 54.410775] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 54.416626] ? perf_trace_lock+0x900/0x900 [ 54.420828] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.425295] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 54.430290] ? trace_hardirqs_on+0xd/0x10 [ 54.434406] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.438872] ? wait_for_completion+0xe0/0x770 [ 54.443339] ? wait_for_completion_interruptible+0x7e0/0x7e0 [ 54.449113] ? __lockdep_init_map+0xe4/0x650 [ 54.453501] ? llist_add_batch+0xf3/0x180 [ 54.457622] ? find_last_bit+0xd0/0xd0 [ 54.461482] lock_acquire+0x394/0x580 [ 54.465256] ? remove_wait_queue+0x81/0x350 [ 54.469567] ? lock_release+0xa40/0xa40 [ 54.473519] ? vhost_work_queue+0xc0/0xc0 [ 54.477637] ? vhost_poll_stop+0x90/0x90 [ 54.481672] ? wait_for_completion+0x770/0x770 [ 54.486224] _raw_spin_lock_irqsave+0x96/0xc0 [ 54.490692] ? remove_wait_queue+0x81/0x350 [ 54.494981] remove_wait_queue+0x81/0x350 [ 54.499102] ? add_wait_queue+0x290/0x290 [ 54.503220] ? vhost_poll_flush+0x3f/0x60 [ 54.507343] ? vhost_net_flush+0x209/0x2a0 [ 54.511547] vhost_dev_stop+0x15c/0x2a0 [ 54.515502] ? vhost_net_compat_ioctl+0x30/0x30 [ 54.520140] vhost_net_release+0x6e/0x190 [ 54.524255] __fput+0x327/0x7e0 [ 54.527507] ? fput+0x140/0x140 [ 54.530755] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 54.536611] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.541078] ____fput+0x15/0x20 [ 54.544326] task_work_run+0x199/0x270 [ 54.548185] ? task_work_cancel+0x210/0x210 [ 54.552479] ? _raw_spin_unlock+0x22/0x30 [ 54.556596] ? switch_task_namespaces+0x87/0xc0 [ 54.561237] do_exit+0x9bb/0x1ad0 [ 54.564661] ? mm_update_next_owner+0x930/0x930 [ 54.569306] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 54.574473] ? debug_check_no_locks_freed+0x3c0/0x3c0 [ 54.579638] ? lock_acquire+0x1d5/0x580 [ 54.583581] ? __lock_is_held+0xb6/0x140 [ 54.587616] ? perf_trace_lock_acquire+0xe3/0x980 [ 54.592427] ? perf_trace_lock_acquire+0xe3/0x980 [ 54.597244] ? perf_trace_lock+0x900/0x900 [ 54.601448] ? check_noncircular+0x20/0x20 [ 54.605657] ? perf_event_sync_stat+0x5b0/0x5b0 [ 54.610296] ? __perf_event_task_sched_in+0x200/0xc20 [ 54.615464] ? find_held_lock+0x35/0x1d0 [ 54.619499] ? get_signal+0x7ae/0x16c0 [ 54.623355] ? lock_downgrade+0x980/0x980 [ 54.627471] do_group_exit+0x149/0x400 [ 54.631333] ? do_raw_spin_trylock+0x190/0x190 [ 54.635882] ? SyS_exit+0x30/0x30 [ 54.639305] ? _raw_spin_unlock_irq+0x27/0x70 [ 54.643769] ? trace_hardirqs_on_caller+0x421/0x5c0 [ 54.648760] get_signal+0x73f/0x16c0 [ 54.652451] ? ptrace_notify+0x130/0x130 [ 54.656489] ? __schedule+0x8f3/0x2060 [ 54.660358] ? __sched_text_start+0x8/0x8 [ 54.664475] ? vhost_net_ioctl+0x2af/0x1910 [ 54.668768] do_signal+0x90/0x1eb0 [ 54.672277] ? trace_event_raw_event_sched_switch+0x800/0x800 [ 54.678130] ? rcu_note_context_switch+0x710/0x710 [ 54.683038] ? setup_sigcontext+0x7d0/0x7d0 [ 54.687334] ? __might_sleep+0x95/0x190 [ 54.691278] ? schedule+0xf5/0x430 [ 54.694787] ? __schedule+0x2060/0x2060 [ 54.698732] ? selinux_capable+0x40/0x40 [ 54.702767] ? exit_to_usermode_loop+0x8c/0x310 [ 54.707404] exit_to_usermode_loop+0x214/0x310 [ 54.711955] ? trace_event_raw_event_sys_exit+0x260/0x260 [ 54.717468] ? lock_downgrade+0x980/0x980 [ 54.721593] ? do_fast_syscall_32+0x156/0xf9d [ 54.726066] do_fast_syscall_32+0xbfd/0xf9d [ 54.730359] ? do_raw_spin_trylock+0x190/0x190 [ 54.734909] ? do_int80_syscall_32+0x9d0/0x9d0 [ 54.739461] ? syscall_return_slowpath+0x2ad/0x550 [ 54.744357] ? prepare_exit_to_usermode+0x340/0x340 [ 54.749342] ? sysret32_from_system_call+0x5/0x3b [ 54.754152] ? trace_hardirqs_off_thunk+0x1a/0x1c [ 54.758963] entry_SYSENTER_compat+0x54/0x63 [ 54.763339] RIP: 0023:0xf7feec79 [ 54.766669] RSP: 002b:00000000f7f8713c EFLAGS: 00000296 ORIG_RAX: 00000000000000f0 [ 54.774343] RAX: 0000000000000001 RBX: 0000000008100f94 RCX: 0000000000000001 [ 54.781580] RDX: 0000000008049815 RSI: 0000000000000000 RDI: 0000000000000000 [ 54.788817] RBP: 00000000003d0f00 R08: 0000000000000000 R09: 0000000000000000 [ 54.796056] R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000000 [ 54.803293] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 [ 54.810950] Dumping ftrace buffer: [ 54.814461] (ftrace buffer empty) [ 54.818139] Kernel Offset: disabled [ 54.821733] Rebooting in 86400 seconds..