[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.740679][ T26] audit: type=1800 audit(1571144992.461:25): pid=7024 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.784629][ T26] audit: type=1800 audit(1571144992.471:26): pid=7024 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.807616][ T26] audit: type=1800 audit(1571144992.471:27): pid=7024 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 '10.128.1.48' (ECDSA) to the list of known hosts. 2019/10/15 13:10:02 fuzzer started 2019/10/15 13:10:03 dialing manager at 10.128.0.105:38903 2019/10/15 13:10:03 syscalls: 2523 2019/10/15 13:10:03 code coverage: enabled 2019/10/15 13:10:03 comparison tracing: enabled 2019/10/15 13:10:03 extra coverage: extra coverage is not supported by the kernel 2019/10/15 13:10:03 setuid sandbox: enabled 2019/10/15 13:10:03 namespace sandbox: enabled 2019/10/15 13:10:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 13:10:03 fault injection: enabled 2019/10/15 13:10:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 13:10:03 net packet injection: enabled 2019/10/15 13:10:03 net device setup: enabled 2019/10/15 13:10:03 concurrency sanitizer: enabled syzkaller login: [ 53.322468][ C1] ================================================================== [ 53.330634][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 53.339544][ C1] [ 53.341855][ C1] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 53.349468][ C1] tick_do_update_jiffies64+0x105/0x260 [ 53.354988][ C1] tick_sched_do_timer+0xd4/0xe0 [ 53.359899][ C1] tick_sched_timer+0x43/0xe0 [ 53.364573][ C1] __hrtimer_run_queues+0x288/0x600 [ 53.369751][ C1] hrtimer_interrupt+0x22a/0x480 [ 53.374684][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 53.380128][ C1] apic_timer_interrupt+0xf/0x20 [ 53.385046][ C1] __kcsan_check_watchpoint+0xa0/0x180 [ 53.390496][ C1] __tsan_read8+0x15/0x30 [ 53.394801][ C1] skb_push+0x7e/0xb0 [ 53.398772][ C1] packet_rcv_spkt+0x251/0x350 [ 53.403514][ C1] __netif_receive_skb_core+0xe13/0x1a90 [ 53.409121][ C1] __netif_receive_skb_one_core+0x67/0xe0 [ 53.414827][ C1] __netif_receive_skb+0x37/0xf0 [ 53.419734][ C1] [ 53.422044][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 53.429581][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 53.435016][ C1] tick_sched_do_timer+0xd4/0xe0 [ 53.439931][ C1] tick_sched_timer+0x43/0xe0 [ 53.444598][ C1] __hrtimer_run_queues+0x288/0x600 [ 53.449786][ C1] hrtimer_interrupt+0x22a/0x480 [ 53.454700][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 53.460144][ C1] apic_timer_interrupt+0xf/0x20 [ 53.465065][ C1] [ 53.467367][ C1] Reported by Kernel Concurrency Sanitizer on: [ 53.473496][ C1] CPU: 1 PID: 7188 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.480573][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.490603][ C1] ================================================================== [ 53.498652][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 53.505224][ C1] CPU: 1 PID: 7188 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 53.512302][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.522334][ C1] Call Trace: [ 53.525594][ C1] [ 53.528430][ C1] dump_stack+0xf5/0x159 [ 53.532656][ C1] panic+0x209/0x639 [ 53.536547][ C1] ? vprintk_func+0x8d/0x140 [ 53.541113][ C1] kcsan_report.cold+0xc/0x1b [ 53.545768][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 53.551292][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 53.556922][ C1] __tsan_read8+0x2c/0x30 [ 53.561242][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 53.566689][ C1] tick_sched_do_timer+0xd4/0xe0 [ 53.571620][ C1] tick_sched_timer+0x43/0xe0 [ 53.576292][ C1] __hrtimer_run_queues+0x288/0x600 [ 53.581484][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 53.586579][ C1] hrtimer_interrupt+0x22a/0x480 [ 53.591500][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 53.596938][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 53.602559][ C1] apic_timer_interrupt+0xf/0x20 [ 53.607479][ C1] [ 53.610408][ C1] RIP: 0033:0x6098cc [ 53.614296][ C1] Code: ff 0f 0b e8 96 da e4 ff e9 11 fc ff ff cc 64 48 8b 0c 25 f8 ff ff ff 48 3b 61 10 0f 86 d5 00 00 00 48 83 ec 38 48 89 6c 24 30 <48> 8d 6c 24 30 48 8b 44 24 40 48 8b 08 48 8b 50 08 48 8b 49 20 48 [ 53.633880][ C1] RSP: 002b:000000c420051a00 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 53.642280][ C1] RAX: 000000c420420028 RBX: 000000c420420000 RCX: 000000c42006e780 [ 53.650228][ C1] RDX: 000000000000000e RSI: 000000000000000a RDI: 00000000000000f1 [ 53.658192][ C1] RBP: 000000c420051a70 R08: 000000c420426000 R09: 00000000000003a7 [ 53.666138][ C1] R10: 00000000ffffffff R11: 0000000000005cca R12: 0000000000000040 [ 53.674085][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 53.683426][ C1] Kernel Offset: disabled [ 53.687745][ C1] Rebooting in 86400 seconds..