[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.134770][ T25] audit: type=1800 audit(1571178322.719:25): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.188876][ T25] audit: type=1800 audit(1571178322.719:26): pid=7045 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 42.216146][ T25] audit: type=1800 audit(1571178322.719:27): pid=7045 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 '10.128.15.216' (ECDSA) to the list of known hosts. 2019/10/15 22:25:31 fuzzer started 2019/10/15 22:25:32 dialing manager at 10.128.0.105:38903 2019/10/15 22:25:32 syscalls: 2523 2019/10/15 22:25:32 code coverage: enabled 2019/10/15 22:25:32 comparison tracing: enabled 2019/10/15 22:25:32 extra coverage: extra coverage is not supported by the kernel 2019/10/15 22:25:32 setuid sandbox: enabled 2019/10/15 22:25:32 namespace sandbox: enabled 2019/10/15 22:25:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 22:25:32 fault injection: enabled 2019/10/15 22:25:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 22:25:32 net packet injection: enabled 2019/10/15 22:25:32 net device setup: enabled 2019/10/15 22:25:32 concurrency sanitizer: enabled syzkaller login: [ 52.917654][ T0] ================================================================== [ 52.925948][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 52.934850][ T0] [ 52.937164][ T0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 52.944783][ T0] tick_do_update_jiffies64+0x105/0x260 [ 52.950305][ T0] tick_sched_do_timer+0xd4/0xe0 [ 52.955231][ T0] tick_sched_timer+0x43/0xe0 [ 52.960062][ T0] __hrtimer_run_queues+0x288/0x600 [ 52.965237][ T0] hrtimer_interrupt+0x22a/0x480 [ 52.970151][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 52.975584][ T0] apic_timer_interrupt+0xf/0x20 [ 52.980496][ T0] write_comp_data+0x1e/0x70 [ 52.985072][ T0] __check_object_size+0xbb/0x33f [ 52.990074][ T0] simple_copy_to_iter+0x31/0x60 [ 52.994986][ T0] __skb_datagram_iter+0x28a/0x470 [ 53.000099][ T0] skb_copy_datagram_iter+0x66/0x170 [ 53.005357][ T0] tcp_recvmsg+0x106c/0x1a30 [ 53.009933][ T0] inet_recvmsg+0xbb/0x250 [ 53.014320][ T0] [ 53.016628][ T0] read to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 0: [ 53.023970][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 53.029405][ T0] tick_irq_enter+0x139/0x1c0 [ 53.034055][ T0] irq_enter+0x4f/0x60 [ 53.038110][ T0] do_IRQ+0x55/0x150 [ 53.041980][ T0] ret_from_intr+0x0/0x19 [ 53.046289][ T0] native_safe_halt+0xe/0x10 [ 53.050858][ T0] arch_cpu_idle+0x1f/0x30 [ 53.055275][ T0] default_idle_call+0x1e/0x40 [ 53.060015][ T0] do_idle+0x1ea/0x2c0 [ 53.064060][ T0] cpu_startup_entry+0x1b/0x20 [ 53.068802][ T0] rest_init+0xec/0xf6 [ 53.072866][ T0] arch_call_rest_init+0x17/0x37 [ 53.077949][ T0] start_kernel+0x83e/0x864 [ 53.082420][ T0] [ 53.084722][ T0] Reported by Kernel Concurrency Sanitizer on: [ 53.090870][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 53.097618][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.107648][ T0] ================================================================== [ 53.115708][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 53.122272][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 53.129005][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.139032][ T0] Call Trace: [ 53.142292][ T0] [ 53.145128][ T0] dump_stack+0xf5/0x159 [ 53.149363][ T0] panic+0x209/0x639 [ 53.153249][ T0] ? do_idle+0x1ea/0x2c0 [ 53.157470][ T0] ? vprintk_func+0x8d/0x140 [ 53.162059][ T0] kcsan_report.cold+0xc/0x1b [ 53.166716][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 53.172238][ T0] __tsan_read8+0x2c/0x30 [ 53.176545][ T0] tick_do_update_jiffies64+0x2b/0x260 [ 53.181981][ T0] tick_irq_enter+0x139/0x1c0 [ 53.186732][ T0] irq_enter+0x4f/0x60 [ 53.190777][ T0] do_IRQ+0x55/0x150 [ 53.194661][ T0] common_interrupt+0xf/0xf [ 53.199138][ T0] [ 53.202065][ T0] RIP: 0010:native_safe_halt+0xe/0x10 [ 53.207413][ T0] Code: 90 90 90 90 90 90 90 90 90 90 90 90 e9 07 00 00 00 0f 00 2d ac d2 4e 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 9c d2 4e 00 fb f4 90 55 48 89 e5 41 55 41 54 53 e8 a2 78 a7 fc e8 9d 54 b9 fd 0f [ 53.230118][ T0] RSP: 0018:ffffffff85a03de0 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 53.238518][ T0] RAX: fbe76c8b4395f2af RBX: 0000000000000000 RCX: 00000000000007b8 [ 53.246465][ T0] RDX: 000000000062a200 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a28 [ 53.254413][ T0] RBP: ffffffff85a03e18 R08: 0000000000000000 R09: 0000ffff85a55a2f [ 53.262361][ T0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffffffff85a2b780 [ 53.270306][ T0] R13: ffffffff85a2b780 R14: 0000000000000000 R15: 0000000000000000 [ 53.278268][ T0] ? default_idle+0x50/0x230 [ 53.282842][ T0] arch_cpu_idle+0x1f/0x30 [ 53.287240][ T0] default_idle_call+0x1e/0x40 [ 53.291979][ T0] do_idle+0x1ea/0x2c0 [ 53.296030][ T0] cpu_startup_entry+0x1b/0x20 [ 53.300770][ T0] rest_init+0xec/0xf6 [ 53.304819][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 53.312047][ T0] arch_call_rest_init+0x17/0x37 [ 53.316962][ T0] start_kernel+0x83e/0x864 [ 53.321448][ T0] x86_64_start_reservations+0x29/0x2b [ 53.326929][ T0] x86_64_start_kernel+0x72/0x76 [ 53.331905][ T0] secondary_startup_64+0xa4/0xb0 [ 53.338329][ T0] Kernel Offset: disabled [ 53.342705][ T0] Rebooting in 86400 seconds..