[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.697663][ T26] audit: type=1800 audit(1571261059.816:25): pid=7100 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.732863][ T26] audit: type=1800 audit(1571261059.816:26): pid=7100 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.762520][ T26] audit: type=1800 audit(1571261059.816:27): pid=7100 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 '10.128.1.47' (ECDSA) to the list of known hosts. 2019/10/16 21:24:29 fuzzer started 2019/10/16 21:24:31 dialing manager at 10.128.0.105:33899 2019/10/16 21:24:31 syscalls: 2524 2019/10/16 21:24:31 code coverage: enabled 2019/10/16 21:24:31 comparison tracing: enabled 2019/10/16 21:24:31 extra coverage: extra coverage is not supported by the kernel 2019/10/16 21:24:31 setuid sandbox: enabled 2019/10/16 21:24:31 namespace sandbox: enabled 2019/10/16 21:24:31 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 21:24:31 fault injection: enabled 2019/10/16 21:24:31 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 21:24:31 net packet injection: enabled 2019/10/16 21:24:31 net device setup: enabled 2019/10/16 21:24:31 concurrency sanitizer: enabled syzkaller login: [ 46.559638][ C1] ================================================================== [ 46.567783][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.576700][ C1] [ 46.579636][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 46.587936][ C1] tick_do_update_jiffies64+0x105/0x260 [ 46.593458][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.598387][ C1] tick_sched_timer+0x43/0xe0 [ 46.603063][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.608250][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.613263][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.618729][ C1] apic_timer_interrupt+0xf/0x20 [ 46.623651][ C1] __sanitizer_cov_trace_cmp4+0x0/0x20 [ 46.629090][ C1] iptable_filter_hook+0x4a/0x60 [ 46.634015][ C1] nf_hook_slow+0x83/0x160 [ 46.638420][ C1] ip_local_deliver+0x1e5/0x210 [ 46.643337][ C1] ip_rcv_finish+0x121/0x160 [ 46.648009][ C1] ip_rcv+0x18f/0x1a0 [ 46.652040][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 46.657730][ C1] [ 46.660057][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 46.667755][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.673192][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.678105][ C1] tick_sched_timer+0x43/0xe0 [ 46.682756][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.687935][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.692848][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.698303][ C1] apic_timer_interrupt+0xf/0x20 [ 46.703208][ C1] [ 46.705510][ C1] Reported by Kernel Concurrency Sanitizer on: [ 46.711640][ C1] CPU: 1 PID: 7259 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.719066][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.729095][ C1] ================================================================== [ 46.737308][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 46.743884][ C1] CPU: 1 PID: 7259 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.751318][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.761347][ C1] Call Trace: [ 46.764605][ C1] [ 46.767441][ C1] dump_stack+0xf5/0x159 [ 46.771664][ C1] panic+0x210/0x640 [ 46.775538][ C1] ? vprintk_func+0x8d/0x140 [ 46.780116][ C1] kcsan_report.cold+0xc/0x1b [ 46.784822][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.790387][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.796094][ C1] __tsan_read8+0x2c/0x30 [ 46.800406][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.805843][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.810771][ C1] tick_sched_timer+0x43/0xe0 [ 46.815432][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.820620][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 46.825761][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.830748][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.836187][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 46.841800][ C1] apic_timer_interrupt+0xf/0x20 [ 46.846709][ C1] [ 46.849626][ C1] RIP: 0033:0x609a3a [ 46.853500][ C1] Code: 44 24 50 00 00 00 00 48 89 4c 24 58 48 89 44 24 60 48 8b 6c 24 30 48 83 c4 38 c3 8b 53 18 89 d7 81 e2 ff 01 00 00 8b 54 90 08 <41> 89 d0 83 e2 0f 48 83 fa 09 0f 86 1b 01 00 00 48 8b 90 10 08 00 [ 46.873079][ C1] RSP: 002b:000000c4204f3a40 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 46.881466][ C1] RAX: 000000c4203d4028 RBX: 000000c4203d4000 RCX: 000000c420085080 [ 46.889413][ C1] RDX: 0000000000000109 RSI: 000000000000000f RDI: 0000000000007ecd [ 46.897591][ C1] RBP: 000000c4204f3a70 R08: 000000c4203da000 R09: 0000000000007ecd [ 46.905572][ C1] R10: 00000000ffffffff R11: 0000000000004b51 R12: 0000000000000080 [ 46.913519][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.922836][ C1] Kernel Offset: disabled [ 46.927158][ C1] Rebooting in 86400 seconds..