[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.098009][ T26] audit: type=1800 audit(1571052322.169:25): pid=7201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.117994][ T26] audit: type=1800 audit(1571052322.169:26): pid=7201 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.139973][ T26] audit: type=1800 audit(1571052322.169:27): pid=7201 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 '10.128.15.199' (ECDSA) to the list of known hosts. 2019/10/14 11:25:33 fuzzer started 2019/10/14 11:25:34 dialing manager at 10.128.0.105:43961 2019/10/14 11:25:34 syscalls: 2523 2019/10/14 11:25:34 code coverage: enabled 2019/10/14 11:25:34 comparison tracing: enabled 2019/10/14 11:25:34 extra coverage: extra coverage is not supported by the kernel 2019/10/14 11:25:34 setuid sandbox: enabled 2019/10/14 11:25:34 namespace sandbox: enabled 2019/10/14 11:25:34 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 11:25:34 fault injection: enabled 2019/10/14 11:25:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 11:25:34 net packet injection: enabled 2019/10/14 11:25:34 net device setup: enabled 2019/10/14 11:25:34 concurrency sanitizer: enabled syzkaller login: [ 47.595097][ T0] ================================================================== [ 47.603355][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 47.611548][ T0] [ 47.613874][ T0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 47.621498][ T0] tick_sched_do_timer+0xc0/0xe0 [ 47.626425][ T0] tick_sched_timer+0x43/0xe0 [ 47.631175][ T0] __hrtimer_run_queues+0x288/0x600 [ 47.636353][ T0] hrtimer_interrupt+0x22a/0x480 [ 47.641275][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 47.646727][ T0] apic_timer_interrupt+0xf/0x20 [ 47.651653][ T0] iptable_mangle_hook+0x6/0x260 [ 47.656593][ T0] nf_hook_slow+0x83/0x160 [ 47.661001][ T0] __ip_local_out+0x1f7/0x2b0 [ 47.666874][ T0] ip_local_out+0x31/0x90 [ 47.671185][ T0] __ip_queue_xmit+0x3a8/0xa40 [ 47.675932][ T0] ip_queue_xmit+0x45/0x60 [ 47.680344][ T0] __tcp_transmit_skb+0xdeb/0x1cd0 [ 47.685443][ T0] tcp_write_xmit+0x9f3/0x3080 [ 47.690179][ T0] [ 47.692516][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 47.699898][ T0] tick_nohz_next_event+0x1a4/0x380 [ 47.705377][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 47.710910][ T0] do_idle+0x1e0/0x2c0 [ 47.715080][ T0] cpu_startup_entry+0x1b/0x20 [ 47.719900][ T0] rest_init+0xec/0xf6 [ 47.724255][ T0] arch_call_rest_init+0x17/0x37 [ 47.729211][ T0] start_kernel+0x83e/0x864 [ 47.733696][ T0] x86_64_start_reservations+0x29/0x2b [ 47.739141][ T0] x86_64_start_kernel+0x72/0x76 [ 47.744097][ T0] secondary_startup_64+0xa4/0xb0 [ 47.749105][ T0] [ 47.751414][ T0] Reported by Kernel Concurrency Sanitizer on: [ 47.757549][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.764287][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.774536][ T0] ================================================================== [ 47.782583][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 47.789168][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 47.795921][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.805969][ T0] Call Trace: [ 47.809266][ T0] dump_stack+0xf5/0x159 [ 47.813639][ T0] panic+0x209/0x639 [ 47.817535][ T0] ? x86_64_start_kernel+0x72/0x76 [ 47.822638][ T0] ? vprintk_func+0x8d/0x140 [ 47.827212][ T0] kcsan_report.cold+0xc/0x1b [ 47.831872][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.837404][ T0] __tsan_read4+0x2c/0x30 [ 47.841869][ T0] tick_nohz_next_event+0x1a4/0x380 [ 47.847413][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 47.853188][ T0] ? __tsan_read4+0x2c/0x30 [ 47.857689][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 47.864037][ T0] do_idle+0x1e0/0x2c0 [ 47.868126][ T0] cpu_startup_entry+0x1b/0x20 [ 47.872876][ T0] rest_init+0xec/0xf6 [ 47.876931][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 47.884126][ T0] arch_call_rest_init+0x17/0x37 [ 47.889053][ T0] start_kernel+0x83e/0x864 [ 47.893541][ T0] x86_64_start_reservations+0x29/0x2b [ 47.898998][ T0] x86_64_start_kernel+0x72/0x76 [ 47.903918][ T0] secondary_startup_64+0xa4/0xb0 [ 47.910562][ T0] Kernel Offset: disabled [ 47.914913][ T0] Rebooting in 86400 seconds..