[ 51.476492][ T26] audit: type=1800 audit(1573052666.164:27): pid=7931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 51.497552][ T26] audit: type=1800 audit(1573052666.164:28): pid=7931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 52.377159][ T26] audit: type=1800 audit(1573052667.134:29): pid=7931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 52.400302][ T26] audit: type=1800 audit(1573052667.134:30): pid=7931 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.232' (ECDSA) to the list of known hosts. 2019/11/06 15:04:37 fuzzer started 2019/11/06 15:04:39 dialing manager at 10.128.0.105:44951 2019/11/06 15:04:39 syscalls: 2553 2019/11/06 15:04:39 code coverage: enabled 2019/11/06 15:04:39 comparison tracing: enabled 2019/11/06 15:04:39 extra coverage: extra coverage is not supported by the kernel 2019/11/06 15:04:39 setuid sandbox: enabled 2019/11/06 15:04:39 namespace sandbox: enabled 2019/11/06 15:04:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/06 15:04:39 fault injection: enabled 2019/11/06 15:04:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/06 15:04:39 net packet injection: enabled 2019/11/06 15:04:39 net device setup: enabled 2019/11/06 15:04:39 concurrency sanitizer: enabled 2019/11/06 15:04:39 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 67.264635][ T8100] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/06 15:04:45 adding functions to KCSAN blacklist: '__skb_try_recv_from_queue' 'blk_mq_sched_dispatch_requests' 'echo_char' 'pipe_poll' 'ktime_get_seconds' 'ep_poll' 'generic_permission' 'tomoyo_supervisor' 'blk_mq_dispatch_rq_list' 'ktime_get_real_seconds' 'taskstats_exit' 'ext4_nonda_switch' '__hrtimer_run_queues' 'poll_schedule_timeout' 'xas_clear_mark' 'dd_has_work' 'sit_tunnel_xmit' 'add_timer' 'tick_do_update_jiffies64' 'do_nanosleep' 'tcp_add_backlog' 'rcu_gp_fqs_check_wake' 'wbt_done' 'pid_update_inode' 'init_peercred' 'find_next_bit' 'blk_mq_get_request' [ 81.384648][ T0] ================================================================== [ 81.392774][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 81.400951][ T0] [ 81.403288][ T0] write to 0xffffffff85cb26d0 of 4 bytes by interrupt on cpu 1: [ 81.410912][ T0] tick_sched_do_timer+0xc0/0xe0 [ 81.415833][ T0] tick_sched_timer+0x43/0xe0 [ 81.420506][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 81.425697][ T0] hrtimer_interrupt+0x22a/0x480 [ 81.430627][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 81.436074][ T0] apic_timer_interrupt+0xf/0x20 [ 81.440994][ T0] tick_nohz_idle_exit+0x136/0x1e0 [ 81.446087][ T0] do_idle+0xb1/0x280 [ 81.450224][ T0] cpu_startup_entry+0x1b/0x20 [ 81.454972][ T0] start_secondary+0x208/0x260 [ 81.459756][ T0] secondary_startup_64+0xa4/0xb0 [ 81.464754][ T0] [ 81.467109][ T0] read to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 0: [ 81.474378][ T0] tick_nohz_next_event+0x19d/0x370 [ 81.479559][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 81.485088][ T0] do_idle+0x1a5/0x280 [ 81.489143][ T0] cpu_startup_entry+0x1b/0x20 [ 81.493924][ T0] rest_init+0xec/0xf6 [ 81.497980][ T0] arch_call_rest_init+0x17/0x37 [ 81.502903][ T0] start_kernel+0x838/0x85e [ 81.507390][ T0] x86_64_start_reservations+0x29/0x2b [ 81.512838][ T0] x86_64_start_kernel+0x72/0x76 [ 81.517757][ T0] secondary_startup_64+0xa4/0xb0 [ 81.522754][ T0] [ 81.525100][ T0] Reported by Kernel Concurrency Sanitizer on: [ 81.531236][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 81.538322][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.548445][ T0] ================================================================== [ 81.556486][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 81.563056][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc6+ #0 [ 81.570157][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 81.581156][ T0] Call Trace: [ 81.584441][ T0] dump_stack+0xf5/0x159 [ 81.588671][ T0] panic+0x210/0x640 [ 81.592555][ T0] ? vprintk_func+0x8d/0x140 [ 81.597133][ T0] kcsan_report.cold+0xc/0xe [ 81.601710][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 81.607088][ T0] __tsan_read4+0x145/0x1f0 [ 81.611616][ T0] tick_nohz_next_event+0x19d/0x370 [ 81.616827][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 81.622362][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.628603][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.634848][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 81.640311][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 81.646579][ T0] do_idle+0x1a5/0x280 [ 81.650637][ T0] cpu_startup_entry+0x1b/0x20 [ 81.655389][ T0] rest_init+0xec/0xf6 [ 81.659442][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 81.666624][ T0] arch_call_rest_init+0x17/0x37 [ 81.671544][ T0] start_kernel+0x838/0x85e [ 81.676036][ T0] x86_64_start_reservations+0x29/0x2b [ 81.681495][ T0] x86_64_start_kernel+0x72/0x76 [ 81.686522][ T0] secondary_startup_64+0xa4/0xb0 [ 81.692908][ T0] Kernel Offset: disabled [ 81.697240][ T0] Rebooting in 86400 seconds..