[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.845221][ T26] audit: type=1800 audit(1571685217.355:25): pid=6973 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.885322][ T26] audit: type=1800 audit(1571685217.355:26): pid=6973 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.906468][ T26] audit: type=1800 audit(1571685217.355:27): pid=6973 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 '10.128.1.50' (ECDSA) to the list of known hosts. 2019/10/21 19:13:48 fuzzer started 2019/10/21 19:13:49 dialing manager at 10.128.0.105:39747 2019/10/21 19:13:49 syscalls: 2524 2019/10/21 19:13:49 code coverage: enabled 2019/10/21 19:13:49 comparison tracing: enabled 2019/10/21 19:13:49 extra coverage: extra coverage is not supported by the kernel 2019/10/21 19:13:49 setuid sandbox: enabled 2019/10/21 19:13:49 namespace sandbox: enabled 2019/10/21 19:13:49 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 19:13:49 fault injection: enabled 2019/10/21 19:13:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 19:13:49 net packet injection: enabled 2019/10/21 19:13:49 net device setup: enabled 2019/10/21 19:13:49 concurrency sanitizer: enabled syzkaller login: [ 49.417786][ T0] ================================================================== [ 49.425905][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 49.434042][ T0] [ 49.436352][ T0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 49.443955][ T0] tick_sched_do_timer+0xc0/0xe0 [ 49.448865][ T0] tick_sched_timer+0x43/0xe0 [ 49.453517][ T0] __hrtimer_run_queues+0x288/0x600 [ 49.458689][ T0] hrtimer_interrupt+0x22a/0x480 [ 49.463606][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 49.469034][ T0] apic_timer_interrupt+0xf/0x20 [ 49.473945][ T0] __kcsan_check_watchpoint+0xba/0x180 [ 49.479376][ T0] __tsan_read8+0x15/0x30 [ 49.483679][ T0] ipt_do_table+0x3e4/0xe60 [ 49.488238][ T0] iptable_raw_hook+0x4a/0x60 [ 49.492888][ T0] nf_hook_slow+0x83/0x160 [ 49.497274][ T0] __ip_local_out+0x1f7/0x2b0 [ 49.501924][ T0] ip_local_out+0x31/0x90 [ 49.506223][ T0] __ip_queue_xmit+0x3a8/0xa40 [ 49.511000][ T0] [ 49.513307][ T0] read to 0xffffffff85cb2790 of 4 bytes by task 0 on cpu 0: [ 49.520563][ T0] tick_nohz_next_event+0x1a4/0x380 [ 49.525734][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 49.531255][ T0] do_idle+0x1a5/0x280 [ 49.535296][ T0] cpu_startup_entry+0x1b/0x20 [ 49.540034][ T0] rest_init+0xec/0xf6 [ 49.544076][ T0] arch_call_rest_init+0x17/0x37 [ 49.548984][ T0] start_kernel+0x838/0x85e [ 49.553459][ T0] x86_64_start_reservations+0x29/0x2b [ 49.558889][ T0] x86_64_start_kernel+0x72/0x76 [ 49.563798][ T0] secondary_startup_64+0xa4/0xb0 [ 49.568787][ T0] [ 49.571085][ T0] Reported by Kernel Concurrency Sanitizer on: [ 49.577214][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.584290][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.594326][ T0] ================================================================== [ 49.604216][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 49.610781][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 49.617865][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.627927][ T0] Call Trace: [ 49.631222][ T0] dump_stack+0xf5/0x159 [ 49.635445][ T0] panic+0x210/0x640 [ 49.639318][ T0] ? x86_64_start_kernel+0x72/0x76 [ 49.644404][ T0] ? vprintk_func+0x8d/0x140 [ 49.648971][ T0] kcsan_report.cold+0xc/0x10 [ 49.653623][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.659142][ T0] __tsan_read4+0x2c/0x30 [ 49.663447][ T0] tick_nohz_next_event+0x1a4/0x380 [ 49.668622][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 49.674142][ T0] ? __tsan_read4+0x2c/0x30 [ 49.678630][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 49.684865][ T0] do_idle+0x1a5/0x280 [ 49.688921][ T0] cpu_startup_entry+0x1b/0x20 [ 49.693667][ T0] rest_init+0xec/0xf6 [ 49.697722][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 49.704904][ T0] arch_call_rest_init+0x17/0x37 [ 49.709826][ T0] start_kernel+0x838/0x85e [ 49.714312][ T0] x86_64_start_reservations+0x29/0x2b [ 49.719745][ T0] x86_64_start_kernel+0x72/0x76 [ 49.724663][ T0] secondary_startup_64+0xa4/0xb0 [ 49.731104][ T0] Kernel Offset: disabled [ 49.735419][ T0] Rebooting in 86400 seconds..