[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.640600][ T23] audit: type=1800 audit(1571297163.850:25): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.677574][ T23] audit: type=1800 audit(1571297163.850:26): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.699825][ T23] audit: type=1800 audit(1571297163.850:27): pid=7028 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.0' (ECDSA) to the list of known hosts. 2019/10/17 07:26:15 fuzzer started 2019/10/17 07:26:16 dialing manager at 10.128.0.105:33899 2019/10/17 07:26:16 syscalls: 2524 2019/10/17 07:26:16 code coverage: enabled 2019/10/17 07:26:16 comparison tracing: enabled 2019/10/17 07:26:16 extra coverage: extra coverage is not supported by the kernel 2019/10/17 07:26:16 setuid sandbox: enabled 2019/10/17 07:26:16 namespace sandbox: enabled 2019/10/17 07:26:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 07:26:16 fault injection: enabled 2019/10/17 07:26:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 07:26:16 net packet injection: enabled 2019/10/17 07:26:16 net device setup: enabled 2019/10/17 07:26:16 concurrency sanitizer: enabled syzkaller login: [ 46.502397][ T0] ================================================================== [ 46.510734][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.519655][ T0] [ 46.521987][ T0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 46.529648][ T0] tick_do_update_jiffies64+0x105/0x260 [ 46.535200][ T0] tick_sched_do_timer+0xd4/0xe0 [ 46.540139][ T0] tick_sched_timer+0x43/0xe0 [ 46.544822][ T0] __hrtimer_run_queues+0x288/0x600 [ 46.551074][ T0] hrtimer_interrupt+0x22a/0x480 [ 46.556020][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.561507][ T0] apic_timer_interrupt+0xf/0x20 [ 46.566441][ T0] __kcsan_setup_watchpoint+0x8e/0x510 [ 46.571885][ T0] __tsan_read4+0x2c/0x30 [ 46.576205][ T0] ipt_do_table+0x560/0xe60 [ 46.582168][ T0] iptable_filter_hook+0x4a/0x60 [ 46.587088][ T0] nf_hook_slow+0x83/0x160 [ 46.591505][ T0] ip_local_deliver+0x1e5/0x210 [ 46.596379][ T0] ip_rcv_finish+0x121/0x160 [ 46.600953][ T0] [ 46.604147][ T0] read to 0xffffffff86042008 of 8 bytes by task 0 on cpu 1: [ 46.611426][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 46.616877][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 46.622755][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 46.627859][ T0] do_idle+0xb1/0x280 [ 46.631830][ T0] cpu_startup_entry+0x1b/0x20 [ 46.636582][ T0] start_secondary+0x208/0x260 [ 46.641325][ T0] secondary_startup_64+0xa4/0xb0 [ 46.646320][ T0] [ 46.648634][ T0] Reported by Kernel Concurrency Sanitizer on: [ 46.654776][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 46.661902][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.671981][ T0] ================================================================== [ 46.680072][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 46.686666][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 46.693779][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.703840][ T0] Call Trace: [ 46.707129][ T0] dump_stack+0xf5/0x159 [ 46.711358][ T0] panic+0x210/0x640 [ 46.715241][ T0] ? vprintk_func+0x8d/0x140 [ 46.719814][ T0] kcsan_report.cold+0xc/0x1b [ 46.724480][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.730011][ T0] __tsan_read8+0x2c/0x30 [ 46.734328][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 46.739769][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 46.745653][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 46.753208][ T0] do_idle+0xb1/0x280 [ 46.757191][ T0] ? complete+0x44/0x50 [ 46.761348][ T0] cpu_startup_entry+0x1b/0x20 [ 46.766102][ T0] start_secondary+0x208/0x260 [ 46.770853][ T0] secondary_startup_64+0xa4/0xb0 [ 46.777338][ T0] Kernel Offset: disabled [ 46.781658][ T0] Rebooting in 86400 seconds..