[ 37.640484][ T26] audit: type=1800 audit(1572817729.615:22): pid=7254 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 37.663804][ T26] audit: type=1800 audit(1572817729.615:23): pid=7254 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 37.683747][ T26] audit: type=1800 audit(1572817729.615:24): pid=7254 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.83' (ECDSA) to the list of known hosts. 2019/11/03 21:49:02 fuzzer started 2019/11/03 21:49:03 dialing manager at 10.128.0.105:42255 2019/11/03 21:49:04 syscalls: 2553 2019/11/03 21:49:04 code coverage: enabled 2019/11/03 21:49:04 comparison tracing: enabled 2019/11/03 21:49:04 extra coverage: extra coverage is not supported by the kernel 2019/11/03 21:49:04 setuid sandbox: enabled 2019/11/03 21:49:04 namespace sandbox: enabled 2019/11/03 21:49:04 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/03 21:49:04 fault injection: enabled 2019/11/03 21:49:04 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/03 21:49:04 net packet injection: enabled 2019/11/03 21:49:04 net device setup: enabled 2019/11/03 21:49:04 concurrency sanitizer: enabled 2019/11/03 21:49:04 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/03 21:49:11 adding functions to KCSAN blacklist: 'ep_poll' 'pipe_poll' 'wbt_issue' 'blk_mq_dispatch_rq_list' 'get_wchan' 'generic_write_end' 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'generic_fillattr' 'task_dump_owner' 'generic_permission' 'audit_log_start' 'find_next_bit' 'vm_area_dup' 'fsnotify' 'ext4_nonda_switch' 'mod_timer' 'pid_update_inode' 'ktime_get_real_seconds' '__tcp_select_window' '__hrtimer_run_queues' 'tomoyo_supervisor' '__splice_from_pipe' 'blk_stat_add' 'blk_mq_sched_dispatch_requests' '__nf_ct_refresh_acct' 'xas_clear_mark' 'do_nanosleep' 'ext4_free_inode' 'tcp_add_backlog' 'blk_mq_get_request' 'tcp_poll' 'run_timer_softirq' '__nf_conntrack_find_get' 'find_get_pages_range_tag' 'add_timer' 'taskstats_exit' 'snapshot_refaults' syzkaller login: [ 76.704051][ T0] ================================================================== [ 76.712165][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 76.720978][ T0] [ 76.723292][ T0] write to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 76.730642][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 76.736191][ T0] do_idle+0x1a5/0x280 [ 76.740263][ T0] cpu_startup_entry+0x1b/0x20 [ 76.745034][ T0] rest_init+0xec/0xf6 [ 76.749090][ T0] arch_call_rest_init+0x17/0x37 [ 76.754004][ T0] start_kernel+0x838/0x85e [ 76.758501][ T0] x86_64_start_reservations+0x29/0x2b [ 76.763935][ T0] x86_64_start_kernel+0x72/0x76 [ 76.768851][ T0] secondary_startup_64+0xa4/0xb0 [ 76.773855][ T0] [ 76.776162][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 1: [ 76.783436][ T0] tick_nohz_next_event+0x1a4/0x380 [ 76.788621][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 76.794145][ T0] do_idle+0x1a5/0x280 [ 76.798190][ T0] cpu_startup_entry+0x1b/0x20 [ 76.802932][ T0] start_secondary+0x208/0x260 [ 76.807697][ T0] secondary_startup_64+0xa4/0xb0 [ 76.812699][ T0] [ 76.815002][ T0] Reported by Kernel Concurrency Sanitizer on: [ 76.821133][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 76.828223][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.838252][ T0] ================================================================== [ 76.846290][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 76.852867][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 76.860032][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 76.870073][ T0] Call Trace: [ 76.873346][ T0] dump_stack+0xf5/0x159 [ 76.877577][ T0] panic+0x210/0x640 [ 76.881516][ T0] ? vprintk_func+0x8d/0x140 [ 76.886092][ T0] kcsan_report.cold+0xc/0x10 [ 76.890756][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 76.896290][ T0] __tsan_read4+0x2c/0x30 [ 76.900602][ T0] tick_nohz_next_event+0x1a4/0x380 [ 76.905780][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 76.911306][ T0] ? __tsan_read4+0x2c/0x30 [ 76.915900][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 76.922439][ T0] do_idle+0x1a5/0x280 [ 76.926515][ T0] cpu_startup_entry+0x1b/0x20 [ 76.931283][ T0] start_secondary+0x208/0x260 [ 76.936638][ T0] secondary_startup_64+0xa4/0xb0 [ 76.942927][ T0] Kernel Offset: disabled [ 76.947256][ T0] Rebooting in 86400 seconds..