[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.265339][ T25] audit: type=1800 audit(1570813046.680:25): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.305824][ T25] audit: type=1800 audit(1570813046.690:26): pid=7061 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.326976][ T25] audit: type=1800 audit(1570813046.690:27): pid=7061 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 '10.128.0.29' (ECDSA) to the list of known hosts. 2019/10/11 16:57:38 fuzzer started 2019/10/11 16:57:39 dialing manager at 10.128.0.105:43913 2019/10/11 16:57:39 syscalls: 2523 2019/10/11 16:57:39 code coverage: enabled 2019/10/11 16:57:39 comparison tracing: enabled 2019/10/11 16:57:39 extra coverage: extra coverage is not supported by the kernel 2019/10/11 16:57:39 setuid sandbox: enabled 2019/10/11 16:57:39 namespace sandbox: enabled 2019/10/11 16:57:39 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 16:57:39 fault injection: enabled 2019/10/11 16:57:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 16:57:39 net packet injection: enabled 2019/10/11 16:57:39 net device setup: enabled 2019/10/11 16:57:39 concurrency sanitizer: enabled syzkaller login: [ 51.157359][ C0] ================================================================== [ 51.165489][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 51.173670][ C0] [ 51.175980][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 51.183596][ C0] tick_sched_do_timer+0xc0/0xe0 [ 51.188558][ C0] tick_sched_timer+0x43/0xe0 [ 51.193214][ C0] __hrtimer_run_queues+0x288/0x600 [ 51.198389][ C0] hrtimer_interrupt+0x22a/0x480 [ 51.203305][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 51.208742][ C0] apic_timer_interrupt+0xf/0x20 [ 51.213669][ C0] __kcsan_check_watchpoint+0x12/0x180 [ 51.219108][ C0] ipt_do_table+0x8bf/0xe40 [ 51.223602][ C0] iptable_raw_hook+0x4a/0x60 [ 51.228257][ C0] nf_hook_slow+0x83/0x160 [ 51.232650][ C0] ip_rcv+0x12f/0x1a0 [ 51.236608][ C0] __netif_receive_skb_one_core+0xa7/0xe0 [ 51.242304][ C0] __netif_receive_skb+0x37/0xf0 [ 51.247216][ C0] netif_receive_skb_internal+0x59/0x190 [ 51.252824][ C0] [ 51.255132][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 51.262652][ C0] tick_sched_do_timer+0x33/0xe0 [ 51.267574][ C0] tick_sched_timer+0x43/0xe0 [ 51.272229][ C0] __hrtimer_run_queues+0x288/0x600 [ 51.277404][ C0] hrtimer_interrupt+0x22a/0x480 [ 51.282328][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 51.287768][ C0] apic_timer_interrupt+0xf/0x20 [ 51.292672][ C0] [ 51.294986][ C0] Reported by Kernel Concurrency Sanitizer on: [ 51.301130][ C0] CPU: 0 PID: 7225 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 51.308210][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.318250][ C0] ================================================================== [ 51.326296][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 51.332858][ C0] CPU: 0 PID: 7225 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 51.339949][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 51.349980][ C0] Call Trace: [ 51.353251][ C0] [ 51.356103][ C0] dump_stack+0xf5/0x159 [ 51.360338][ C0] panic+0x209/0x639 [ 51.364225][ C0] ? vprintk_func+0x8d/0x140 [ 51.368795][ C0] kcsan_report.cold+0xc/0x1b [ 51.373465][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 51.379090][ C0] __tsan_read4+0x2c/0x30 [ 51.383401][ C0] tick_sched_do_timer+0x33/0xe0 [ 51.388316][ C0] tick_sched_timer+0x43/0xe0 [ 51.392983][ C0] __hrtimer_run_queues+0x288/0x600 [ 51.398162][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 51.403255][ C0] hrtimer_interrupt+0x22a/0x480 [ 51.408174][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 51.413621][ C0] apic_timer_interrupt+0xf/0x20 [ 51.418533][ C0] [ 51.421457][ C0] RIP: 0033:0x6086e9 [ 51.425332][ C0] Code: 48 8d 91 88 10 00 00 84 02 48 8b 91 90 10 00 00 48 8b 99 88 10 00 00 48 8b b1 a0 10 00 00 48 39 d6 0f 83 f9 09 00 00 88 04 33 <48> 8b 91 a0 10 00 00 48 ff c2 48 89 91 a0 10 00 00 48 8b 99 98 10 [ 51.444927][ C0] RSP: 002b:000000c4203c1ab8 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 [ 51.453313][ C0] RAX: 0000000000000053 RBX: 000000c4204b4000 RCX: 000000c420318000 [ 51.461262][ C0] RDX: 0000000000008000 RSI: 00000000000000b4 RDI: 0000000000000053 [ 51.469208][ C0] RBP: 000000c4203c1b50 R08: 0000000000000539 R09: 00000000000003e6 [ 51.477156][ C0] R10: ffffffffffffffff R11: 0000000000000001 R12: 0000000000000008 [ 51.485104][ C0] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 51.494384][ C0] Kernel Offset: disabled [ 51.498703][ C0] Rebooting in 86400 seconds..