[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.603490][ T26] audit: type=1800 audit(1571291598.127:25): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.640901][ T26] audit: type=1800 audit(1571291598.127:26): pid=7043 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.678516][ T26] audit: type=1800 audit(1571291598.137:27): pid=7043 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 '10.128.0.81' (ECDSA) to the list of known hosts. 2019/10/17 05:53:26 fuzzer started 2019/10/17 05:53:28 dialing manager at 10.128.0.105:33899 2019/10/17 05:53:28 syscalls: 2524 2019/10/17 05:53:28 code coverage: enabled 2019/10/17 05:53:28 comparison tracing: enabled 2019/10/17 05:53:28 extra coverage: extra coverage is not supported by the kernel 2019/10/17 05:53:28 setuid sandbox: enabled 2019/10/17 05:53:28 namespace sandbox: enabled 2019/10/17 05:53:28 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 05:53:28 fault injection: enabled 2019/10/17 05:53:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 05:53:28 net packet injection: enabled 2019/10/17 05:53:28 net device setup: enabled 2019/10/17 05:53:28 concurrency sanitizer: enabled syzkaller login: [ 45.797562][ C0] ================================================================== [ 45.805697][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 45.814651][ C0] [ 45.817002][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 45.824612][ C0] tick_do_update_jiffies64+0x105/0x260 [ 45.830175][ C0] tick_sched_do_timer+0xd4/0xe0 [ 45.835127][ C0] tick_sched_timer+0x43/0xe0 [ 45.839790][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.844962][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.849877][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.855397][ C0] apic_timer_interrupt+0xf/0x20 [ 45.860316][ C0] [ 45.862622][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 45.870144][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 45.875578][ C0] tick_sched_do_timer+0xd4/0xe0 [ 45.880491][ C0] tick_sched_timer+0x43/0xe0 [ 45.885168][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.890356][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.895285][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.900717][ C0] apic_timer_interrupt+0xf/0x20 [ 45.905638][ C0] [ 45.907940][ C0] Reported by Kernel Concurrency Sanitizer on: [ 45.914071][ C0] CPU: 0 PID: 7196 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.921497][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.931545][ C0] ================================================================== [ 45.939581][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 45.946145][ C0] CPU: 0 PID: 7196 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.953573][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.963602][ C0] Call Trace: [ 45.966859][ C0] [ 45.969694][ C0] dump_stack+0xf5/0x159 [ 45.973911][ C0] panic+0x210/0x640 [ 45.977784][ C0] ? vprintk_func+0x8d/0x140 [ 45.982350][ C0] kcsan_report.cold+0xc/0x1b [ 45.987004][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.992524][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 45.998133][ C0] __tsan_read8+0x2c/0x30 [ 46.002441][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 46.007892][ C0] tick_sched_do_timer+0xd4/0xe0 [ 46.012809][ C0] tick_sched_timer+0x43/0xe0 [ 46.017466][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.022640][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.027729][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.032665][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.038110][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 46.043720][ C0] apic_timer_interrupt+0xf/0x20 [ 46.048629][ C0] [ 46.051544][ C0] RIP: 0033:0x41d178 [ 46.055420][ C0] Code: 17 41 84 00 0f b6 14 17 85 d2 75 06 48 8d 56 40 eb cb 45 31 c0 eb 09 49 ff c0 d1 ea 48 83 c6 08 49 83 f8 08 0f 8d e7 00 00 00 <48> 39 de 0f 83 de 00 00 00 0f ba e2 00 0f 83 ca 00 00 00 4c 8b 4c [ 46.075020][ C0] RSP: 002b:00007ffc8ef666c0 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13 [ 46.083412][ C0] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420600000 [ 46.091374][ C0] RDX: 0000000000000014 RSI: 0000000000007250 RDI: 00007f9d86e42000 [ 46.099325][ C0] RBP: 00007ffc8ef66728 R08: 0000000000000002 R09: 0000000001624f80 [ 46.107271][ C0] R10: 0000000000000000 R11: 000000c420564030 R12: 0000000000000040 [ 46.115253][ C0] R13: 0000000000000040 R14: 0000000000000011 R15: 00000000000000aa [ 46.124579][ C0] Kernel Offset: disabled [ 46.128903][ C0] Rebooting in 86400 seconds..