[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.049174][ T25] audit: type=1800 audit(1571421164.117:25): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.068992][ T25] audit: type=1800 audit(1571421164.127:26): pid=7062 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.089802][ T25] audit: type=1800 audit(1571421164.127:27): pid=7062 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 '10.128.0.62' (ECDSA) to the list of known hosts. 2019/10/18 17:52:55 fuzzer started 2019/10/18 17:52:57 dialing manager at 10.128.0.105:43535 2019/10/18 17:52:57 syscalls: 2524 2019/10/18 17:52:57 code coverage: enabled 2019/10/18 17:52:57 comparison tracing: enabled 2019/10/18 17:52:57 extra coverage: extra coverage is not supported by the kernel 2019/10/18 17:52:57 setuid sandbox: enabled 2019/10/18 17:52:57 namespace sandbox: enabled 2019/10/18 17:52:57 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/18 17:52:57 fault injection: enabled 2019/10/18 17:52:57 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/18 17:52:57 net packet injection: enabled 2019/10/18 17:52:57 net device setup: enabled 2019/10/18 17:52:57 concurrency sanitizer: enabled syzkaller login: [ 49.899388][ C0] ================================================================== [ 49.908309][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 49.917349][ C0] [ 49.920272][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 49.928696][ C0] tick_do_update_jiffies64+0x105/0x260 [ 49.934671][ C0] tick_sched_do_timer+0xd4/0xe0 [ 49.939790][ C0] tick_sched_timer+0x43/0xe0 [ 49.944445][ C0] __hrtimer_run_queues+0x288/0x600 [ 49.952243][ C0] hrtimer_interrupt+0x22a/0x480 [ 49.957171][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 49.962693][ C0] apic_timer_interrupt+0xf/0x20 [ 49.968239][ C0] __kcsan_setup_watchpoint+0x291/0x4a0 [ 49.973759][ C0] __tsan_read8+0x2c/0x30 [ 49.979122][ C0] virtqueue_add+0x9ec/0x1a80 [ 49.983804][ C0] virtqueue_add_inbuf_ctx+0x50/0x6a [ 49.989095][ C0] try_fill_recv+0x67d/0xda0 [ 49.994069][ C0] virtnet_poll+0x64c/0x7d0 [ 50.000689][ C0] net_rx_action+0x3ae/0xa90 [ 50.005783][ C0] [ 50.008091][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 50.015615][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 50.021057][ C0] tick_sched_do_timer+0xd4/0xe0 [ 50.025978][ C0] tick_sched_timer+0x43/0xe0 [ 50.030632][ C0] __hrtimer_run_queues+0x288/0x600 [ 50.035814][ C0] hrtimer_interrupt+0x22a/0x480 [ 50.040837][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.046548][ C0] apic_timer_interrupt+0xf/0x20 [ 50.051714][ C0] [ 50.054016][ C0] Reported by Kernel Concurrency Sanitizer on: [ 50.060318][ C0] CPU: 0 PID: 7228 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.067845][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.078136][ C0] ================================================================== [ 50.086176][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 50.092837][ C0] CPU: 0 PID: 7228 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 50.100890][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.110977][ C0] Call Trace: [ 50.115040][ C0] [ 50.118349][ C0] dump_stack+0xf5/0x159 [ 50.122746][ C0] panic+0x210/0x640 [ 50.126627][ C0] ? vprintk_func+0x8d/0x140 [ 50.131460][ C0] kcsan_report.cold+0xc/0x10 [ 50.136209][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 50.141833][ C0] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 50.148586][ C0] __tsan_read8+0x2c/0x30 [ 50.152934][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 50.158721][ C0] tick_sched_do_timer+0xd4/0xe0 [ 50.163639][ C0] tick_sched_timer+0x43/0xe0 [ 50.168418][ C0] __hrtimer_run_queues+0x288/0x600 [ 50.173726][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 50.178815][ C0] hrtimer_interrupt+0x22a/0x480 [ 50.183735][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 50.189897][ C0] ? do_IRQ+0xcb/0x180 [ 50.193966][ C0] apic_timer_interrupt+0xf/0x20 [ 50.199752][ C0] [ 50.202670][ C0] RIP: 0033:0x47c530 [ 50.206556][ C0] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 50.226920][ C0] RSP: 002b:000000c420185810 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 50.235827][ C0] RAX: fffffffffffffff5 RBX: 0000000000000000 RCX: 000000000047c530 [ 50.243775][ C0] RDX: 0000000000001000 RSI: 000000c420376000 RDI: 0000000000000003 [ 50.252243][ C0] RBP: 000000c420185868 R08: 0000000000000000 R09: 0000000000000000 [ 50.261234][ C0] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000007 [ 50.269790][ C0] R13: 000000c42007f780 R14: 0000000000000004 R15: ffffffffffffffff [ 50.279533][ C0] Kernel Offset: disabled [ 50.283865][ C0] Rebooting in 86400 seconds..