[ 53.716807][ T26] audit: type=1800 audit(1573055034.605:27): pid=7879 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 53.746430][ T26] audit: type=1800 audit(1573055034.605:28): pid=7879 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. [ 54.621497][ T26] audit: type=1800 audit(1573055035.595:29): pid=7879 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 [ 54.641956][ T26] audit: type=1800 audit(1573055035.595:30): pid=7879 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 '10.128.0.166' (ECDSA) to the list of known hosts. 2019/11/06 15:44:02 fuzzer started 2019/11/06 15:44:04 dialing manager at 10.128.0.105:44951 2019/11/06 15:44:06 syscalls: 2553 2019/11/06 15:44:06 code coverage: enabled 2019/11/06 15:44:06 comparison tracing: enabled 2019/11/06 15:44:06 extra coverage: extra coverage is not supported by the kernel 2019/11/06 15:44:06 setuid sandbox: enabled 2019/11/06 15:44:06 namespace sandbox: enabled 2019/11/06 15:44:06 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/06 15:44:06 fault injection: enabled 2019/11/06 15:44:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/06 15:44:06 net packet injection: enabled 2019/11/06 15:44:06 net device setup: enabled 2019/11/06 15:44:06 concurrency sanitizer: enabled 2019/11/06 15:44:06 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 68.708114][ T8047] KCSAN: could not find function: 'poll_schedule_timeout' 2019/11/06 15:44:13 adding functions to KCSAN blacklist: '__skb_try_recv_from_queue' 'blk_mq_sched_dispatch_requests' 'generic_fillattr' '__ext4_new_inode' 'lruvec_lru_size' 'common_perm_cond' 'echo_char' 'pipe_poll' 'do_exit' 'ktime_get_seconds' 'p9_poll_workfn' 'ext4_free_inodes_count' 'do_syslog' 'ep_poll' 'generic_permission' 'blk_mq_dispatch_rq_list' 'ktime_get_real_seconds' 'taskstats_exit' 'ext4_nonda_switch' 'poll_schedule_timeout' 'xas_clear_mark' '__hrtimer_run_queues' 'tomoyo_supervisor' 'mod_timer' 'dd_has_work' 'sit_tunnel_xmit' 'add_timer' 'ext4_free_inode' 'generic_write_end' 'tick_do_update_jiffies64' 'do_nanosleep' 'vm_area_dup' 'run_timer_softirq' 'tcp_add_backlog' 'tick_nohz_next_event' 'rcu_gp_fqs_loop' 'rcu_gp_fqs_check_wake' 'tick_sched_do_timer' 'pid_update_inode' 'wbt_done' 'init_peercred' 'find_next_bit' 'blk_mq_get_request' [ 109.162992][ T0] ================================================================== [ 109.171162][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 109.184675][ T0] [ 109.187006][ T0] write to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 0: [ 109.194363][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 109.200126][ T0] do_idle+0x1a5/0x280 [ 109.204334][ T0] cpu_startup_entry+0x1b/0x20 [ 109.209207][ T0] rest_init+0xec/0xf6 [ 109.214018][ T0] arch_call_rest_init+0x17/0x37 [ 109.219311][ T0] start_kernel+0x838/0x85e [ 109.224199][ T0] x86_64_start_reservations+0x29/0x2b [ 109.230133][ T0] x86_64_start_kernel+0x72/0x76 [ 109.235061][ T0] secondary_startup_64+0xa4/0xb0 [ 109.240418][ T0] [ 109.242734][ T0] read to 0xffffffff85cb26d0 of 4 bytes by task 0 on cpu 1: [ 109.250103][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 109.255822][ T0] do_idle+0x1a5/0x280 [ 109.259988][ T0] cpu_startup_entry+0x1b/0x20 [ 109.265286][ T0] start_secondary+0x208/0x260 [ 109.270749][ T0] secondary_startup_64+0xa4/0xb0 [ 109.276663][ T0] [ 109.279579][ T0] Reported by Kernel Concurrency Sanitizer on: [ 109.285923][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 109.293010][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 109.303405][ T0] ================================================================== [ 109.311709][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 109.318796][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc6+ #0 [ 109.327097][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 109.337695][ T0] Call Trace: [ 109.341080][ T0] dump_stack+0xf5/0x159 [ 109.345676][ T0] panic+0x210/0x640 [ 109.349674][ T0] ? vprintk_func+0x8d/0x140 [ 109.358965][ T0] kcsan_report.cold+0xc/0xe [ 109.363581][ T0] kcsan_setup_watchpoint+0x3fe/0x410 [ 109.368952][ T0] __tsan_read4+0x145/0x1f0 [ 109.373661][ T0] tick_nohz_idle_stop_tick+0x193/0x670 [ 109.379220][ T0] ? __tsan_read4+0x145/0x1f0 [ 109.383898][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 109.390398][ T0] do_idle+0x1a5/0x280 [ 109.394478][ T0] cpu_startup_entry+0x1b/0x20 [ 109.399245][ T0] start_secondary+0x208/0x260 [ 109.404088][ T0] secondary_startup_64+0xa4/0xb0 [ 109.410819][ T0] Kernel Offset: disabled [ 109.415170][ T0] Rebooting in 86400 seconds..