[....] 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. [ 56.855523][ T26] kauditd_printk_skb: 8 callbacks suppressed [ 56.855538][ T26] audit: type=1800 audit(1573838784.975:29): pid=7501 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 [ 56.883245][ T26] audit: type=1800 audit(1573838784.975:30): pid=7501 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 '10.128.0.52' (ECDSA) to the list of known hosts. 2019/11/15 17:26:35 fuzzer started 2019/11/15 17:26:36 dialing manager at 10.128.0.105:44219 2019/11/15 17:26:36 syscalls: 2566 2019/11/15 17:26:36 code coverage: enabled 2019/11/15 17:26:36 comparison tracing: enabled 2019/11/15 17:26:36 extra coverage: extra coverage is not supported by the kernel 2019/11/15 17:26:36 setuid sandbox: enabled 2019/11/15 17:26:36 namespace sandbox: enabled 2019/11/15 17:26:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/15 17:26:36 fault injection: enabled 2019/11/15 17:26:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/15 17:26:36 net packet injection: enabled 2019/11/15 17:26:36 net device setup: enabled 2019/11/15 17:26:36 concurrency sanitizer: enabled 2019/11/15 17:26:36 devlink PCI setup: PCI device 0000:00:10.0 is not available 2019/11/15 17:26:39 adding functions to KCSAN blacklist: 'generic_permission' 'tcp_add_backlog' 'alloc_empty_file' 'tick_sched_do_timer' 'tick_do_update_jiffies64' 'find_next_bit' 'add_timer' '__rb_rotate_set_parents' 'pipe_wait' 'pcpu_alloc' 'common_perm_cond' '__ext4_new_inode' 'rcu_gp_fqs_check_wake' '__hrtimer_run_queues' 'pid_update_inode' 'ep_insert' 'vm_area_dup' 'pipe_poll' 'do_syslog' 'tomoyo_supervisor' 'run_timer_softirq' '__rb_insert_augmented' 'timer_clear_idle' 'ep_poll' 'generic_fillattr' 'mod_timer' syzkaller login: [ 72.212646][ T0] ================================================================== [ 72.220888][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 72.229845][ T0] [ 72.232167][ T0] read to 0xffffffff85cb3ad0 of 4 bytes by task 0 on cpu 0: [ 72.239466][ T0] tick_nohz_next_event+0x19d/0x370 [ 72.244648][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 72.250173][ T0] do_idle+0x1a5/0x280 [ 72.254221][ T0] cpu_startup_entry+0x1b/0x20 [ 72.259053][ T0] rest_init+0xec/0xf6 [ 72.263102][ T0] arch_call_rest_init+0x17/0x37 [ 72.268021][ T0] start_kernel+0x838/0x85e [ 72.272505][ T0] x86_64_start_reservations+0x29/0x2b [ 72.277940][ T0] x86_64_start_kernel+0x72/0x76 [ 72.282957][ T0] secondary_startup_64+0xa4/0xb0 [ 72.287957][ T0] [ 72.290277][ T0] write to 0xffffffff85cb3ad0 of 4 bytes by task 0 on cpu 1: [ 72.297632][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 72.303154][ T0] do_idle+0x1a5/0x280 [ 72.307202][ T0] cpu_startup_entry+0x1b/0x20 [ 72.312051][ T0] start_secondary+0x168/0x1b0 [ 72.318270][ T0] secondary_startup_64+0xa4/0xb0 [ 72.323262][ T0] [ 72.325565][ T0] Reported by Kernel Concurrency Sanitizer on: [ 72.331930][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc7+ #0 [ 72.339011][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.349063][ T0] ================================================================== [ 72.357137][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 72.363710][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc7+ #0 [ 72.370806][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 72.380866][ T0] Call Trace: [ 72.384167][ T0] dump_stack+0x11d/0x181 [ 72.388509][ T0] panic+0x210/0x640 [ 72.392413][ T0] ? vprintk_func+0x8d/0x140 [ 72.397102][ T0] kcsan_report.cold+0xc/0xd [ 72.401703][ T0] kcsan_setup_watchpoint+0x3fe/0x460 [ 72.407087][ T0] __tsan_unaligned_write4+0xc4/0x100 [ 72.412469][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 72.418026][ T0] ? debug_smp_processor_id+0x4c/0x172 [ 72.423496][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 72.429743][ T0] do_idle+0x1a5/0x280 [ 72.433818][ T0] ? debug_smp_processor_id+0x47/0x172 [ 72.439294][ T0] cpu_startup_entry+0x1b/0x20 [ 72.444063][ T0] start_secondary+0x168/0x1b0 [ 72.448926][ T0] secondary_startup_64+0xa4/0xb0 [ 72.455584][ T0] Kernel Offset: disabled [ 72.459936][ T0] Rebooting in 86400 seconds..