[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.028829][ T25] audit: type=1800 audit(1571355179.249:25): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.074937][ T25] audit: type=1800 audit(1571355179.249:26): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.103430][ T25] audit: type=1800 audit(1571355179.249:27): pid=7118 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 '10.128.0.142' (ECDSA) to the list of known hosts. 2019/10/17 23:33:10 fuzzer started 2019/10/17 23:33:12 dialing manager at 10.128.0.105:43535 2019/10/17 23:33:12 syscalls: 2524 2019/10/17 23:33:12 code coverage: enabled 2019/10/17 23:33:12 comparison tracing: enabled 2019/10/17 23:33:12 extra coverage: extra coverage is not supported by the kernel 2019/10/17 23:33:12 setuid sandbox: enabled 2019/10/17 23:33:12 namespace sandbox: enabled 2019/10/17 23:33:12 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 23:33:12 fault injection: enabled 2019/10/17 23:33:12 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 23:33:12 net packet injection: enabled 2019/10/17 23:33:12 net device setup: enabled 2019/10/17 23:33:12 concurrency sanitizer: enabled syzkaller login: [ 48.980580][ C1] ================================================================== [ 48.988718][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 48.997628][ C1] [ 48.999944][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 49.007559][ C1] tick_do_update_jiffies64+0x105/0x260 [ 49.013090][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.018011][ C1] tick_sched_timer+0x43/0xe0 [ 49.022676][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.027855][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.032776][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.038217][ C1] apic_timer_interrupt+0xf/0x20 [ 49.043128][ C1] [ 49.045445][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 49.052974][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 49.058416][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.063336][ C1] tick_sched_timer+0x43/0xe0 [ 49.068082][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.073263][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.078185][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.083624][ C1] apic_timer_interrupt+0xf/0x20 [ 49.088798][ C1] [ 49.091104][ C1] Reported by Kernel Concurrency Sanitizer on: [ 49.097767][ C1] CPU: 1 PID: 7284 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.105201][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.115235][ C1] ================================================================== [ 49.123292][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 49.129876][ C1] CPU: 1 PID: 7284 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.137314][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.147354][ C1] Call Trace: [ 49.150620][ C1] [ 49.153483][ C1] dump_stack+0xf5/0x159 [ 49.157713][ C1] panic+0x210/0x640 [ 49.161596][ C1] ? vprintk_func+0x8d/0x140 [ 49.166184][ C1] kcsan_report.cold+0xc/0x10 [ 49.170850][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.176390][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.182010][ C1] __tsan_read8+0x2c/0x30 [ 49.186331][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 49.191865][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.196788][ C1] tick_sched_timer+0x43/0xe0 [ 49.201454][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.206641][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 49.211743][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.216677][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.222123][ C1] ? smp_call_function_single_interrupt+0x80/0x1c0 [ 49.228619][ C1] apic_timer_interrupt+0xf/0x20 [ 49.233543][ C1] [ 49.236468][ C1] RIP: 0033:0x41d12b [ 49.240355][ C1] Code: 00 00 48 83 ec 70 48 89 6c 24 68 48 8d 6c 24 68 48 8b 05 50 8b 40 01 48 89 44 24 60 48 8b 0d 4c 8b 40 01 48 89 4c 24 58 31 d2 <48> 8b 9c 24 80 00 00 00 48 39 da 0f 83 2b 01 00 00 48 89 d6 48 c1 [ 49.259952][ C1] RSP: 002b:000000c4202f3e10 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 49.268351][ C1] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420600000 [ 49.276312][ C1] RDX: 0000000000022980 RSI: 0000000000022980 RDI: 00007fc3ac8e0000 [ 49.284270][ C1] RBP: 000000c4202f3e78 R08: 0000000000000008 R09: 00000000011e4f80 [ 49.292227][ C1] R10: 00000000008aade3 R11: 000000c4202f3fc0 R12: 0000000000000020 [ 49.300197][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.309566][ C1] Kernel Offset: disabled [ 49.313902][ C1] Rebooting in 86400 seconds..