[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.435949][ T26] audit: type=1800 audit(1571289908.401:25): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.463194][ T26] audit: type=1800 audit(1571289908.401:26): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.490256][ T26] audit: type=1800 audit(1571289908.401:27): pid=7013 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 '10.128.15.218' (ECDSA) to the list of known hosts. 2019/10/17 05:25:16 fuzzer started 2019/10/17 05:25:18 dialing manager at 10.128.0.105:33899 2019/10/17 05:25:18 syscalls: 2524 2019/10/17 05:25:18 code coverage: enabled 2019/10/17 05:25:18 comparison tracing: enabled 2019/10/17 05:25:18 extra coverage: extra coverage is not supported by the kernel 2019/10/17 05:25:18 setuid sandbox: enabled 2019/10/17 05:25:18 namespace sandbox: enabled 2019/10/17 05:25:18 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 05:25:18 fault injection: enabled 2019/10/17 05:25:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 05:25:18 net packet injection: enabled 2019/10/17 05:25:18 net device setup: enabled 2019/10/17 05:25:18 concurrency sanitizer: enabled syzkaller login: [ 46.621021][ C1] ================================================================== [ 46.629366][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 46.638279][ C1] [ 46.640590][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 46.648297][ C1] tick_do_update_jiffies64+0x105/0x260 [ 46.653851][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.658781][ C1] tick_sched_timer+0x43/0xe0 [ 46.663440][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.668627][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.673632][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.679067][ C1] apic_timer_interrupt+0xf/0x20 [ 46.683987][ C1] poll_select_finish+0x13b/0x440 [ 46.688997][ C1] do_pselect.constprop.0+0x130/0x160 [ 46.694360][ C1] __x64_sys_pselect6+0x12e/0x170 [ 46.699369][ C1] do_syscall_64+0xcc/0x370 [ 46.703875][ C1] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 46.709743][ C1] [ 46.712062][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 46.719708][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.725150][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.730065][ C1] tick_sched_timer+0x43/0xe0 [ 46.734733][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.740025][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.744960][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.750425][ C1] apic_timer_interrupt+0xf/0x20 [ 46.755355][ C1] __kcsan_setup_watchpoint+0x0/0x510 [ 46.760720][ C1] receive_buf+0x1e3/0x30b0 [ 46.765199][ C1] virtnet_poll+0x436/0x7d0 [ 46.769681][ C1] net_rx_action+0x3ae/0xa90 [ 46.774246][ C1] __do_softirq+0x115/0x33f [ 46.778728][ C1] run_ksoftirqd+0x46/0x60 [ 46.784516][ C1] [ 46.786817][ C1] Reported by Kernel Concurrency Sanitizer on: [ 46.792962][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 46.800300][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.810343][ C1] ================================================================== [ 46.818412][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 46.824999][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 46.832352][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.842432][ C1] Call Trace: [ 46.845700][ C1] [ 46.848539][ C1] dump_stack+0xf5/0x159 [ 46.852763][ C1] panic+0x210/0x640 [ 46.856640][ C1] ? receive_buf+0x1e3/0x30b0 [ 46.861304][ C1] ? vprintk_func+0x8d/0x140 [ 46.865885][ C1] kcsan_report.cold+0xc/0x1b [ 46.870540][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.876076][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.881686][ C1] __tsan_read8+0x2c/0x30 [ 46.886008][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 46.891447][ C1] tick_sched_do_timer+0xd4/0xe0 [ 46.896378][ C1] tick_sched_timer+0x43/0xe0 [ 46.901059][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.906247][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 46.911340][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.916283][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.922677][ C1] ? do_IRQ+0xcb/0x180 [ 46.926735][ C1] apic_timer_interrupt+0xf/0x20 [ 46.931656][ C1] [ 46.934573][ C1] RIP: 0010:__kcsan_setup_watchpoint+0x0/0x510 [ 46.940879][ C1] Code: 90 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 c3 bf 04 00 00 00 41 bf 02 00 00 00 e8 6b 0b 00 00 eb bc 66 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 57 41 56 41 55 49 89 fd 41 54 49 89 f4 53 89 d3 48 [ 46.960982][ C1] RSP: 0018:ffffc90000cf3b80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 46.969455][ C1] RAX: 0000000000000001 RBX: 0000000000000002 RCX: 0000ffffffffffff [ 46.977410][ C1] RDX: 0000000000000000 RSI: 0000000000000001 RDI: ffff8881235a2029 [ 46.985400][ C1] RBP: ffffc90000cf3b90 R08: 0000000000000000 R09: 00008881235a2029 [ 46.993355][ C1] R10: 00000000aaaaaaab R11: ffffffff86045d28 R12: ffff8881235a2029 [ 47.001479][ C1] R13: ffff8881235a2029 R14: ffff8881235a2028 R15: ffff8881235a2000 [ 47.009462][ C1] ? __tsan_read1+0x2c/0x30 [ 47.013959][ C1] receive_buf+0x1e3/0x30b0 [ 47.018439][ C1] ? __tsan_write8+0x32/0x40 [ 47.023012][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 47.028452][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.034066][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.039681][ C1] virtnet_poll+0x436/0x7d0 [ 47.044167][ C1] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 47.049873][ C1] net_rx_action+0x3ae/0xa90 [ 47.054450][ C1] __do_softirq+0x115/0x33f [ 47.058952][ C1] ? takeover_tasklets+0x250/0x250 [ 47.064058][ C1] run_ksoftirqd+0x46/0x60 [ 47.068473][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 47.073395][ C1] kthread+0x1d4/0x200 [ 47.077456][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 47.083413][ C1] ? kthread_stop+0x2d0/0x2d0 [ 47.088085][ C1] ret_from_fork+0x1f/0x30 [ 47.093996][ C1] Kernel Offset: disabled [ 47.098318][ C1] Rebooting in 86400 seconds..