[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.963108][ T25] audit: type=1800 audit(1570896303.026:25): pid=7074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.000101][ T25] audit: type=1800 audit(1570896303.026:26): pid=7074 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.020487][ T25] audit: type=1800 audit(1570896303.026:27): pid=7074 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 '10.128.10.22' (ECDSA) to the list of known hosts. 2019/10/12 16:05:13 fuzzer started 2019/10/12 16:05:14 dialing manager at 10.128.0.105:43913 2019/10/12 16:05:14 syscalls: 2523 2019/10/12 16:05:14 code coverage: enabled 2019/10/12 16:05:14 comparison tracing: enabled 2019/10/12 16:05:14 extra coverage: extra coverage is not supported by the kernel 2019/10/12 16:05:14 setuid sandbox: enabled 2019/10/12 16:05:14 namespace sandbox: enabled 2019/10/12 16:05:14 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 16:05:14 fault injection: enabled 2019/10/12 16:05:14 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 16:05:14 net packet injection: enabled 2019/10/12 16:05:14 net device setup: enabled 2019/10/12 16:05:14 concurrency sanitizer: enabled syzkaller login: [ 47.434410][ C1] ================================================================== [ 47.442646][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 47.451550][ C1] [ 47.453876][ C1] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 47.461479][ C1] tick_do_update_jiffies64+0x105/0x260 [ 47.467016][ C1] tick_sched_do_timer+0xd4/0xe0 [ 47.471927][ C1] tick_sched_timer+0x43/0xe0 [ 47.476584][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.481792][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.486706][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.492140][ C1] apic_timer_interrupt+0xf/0x20 [ 47.497047][ C1] [ 47.499352][ C1] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 47.506887][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 47.512318][ C1] tick_sched_do_timer+0xd4/0xe0 [ 47.517242][ C1] tick_sched_timer+0x43/0xe0 [ 47.521908][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.527103][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.532015][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.537458][ C1] apic_timer_interrupt+0xf/0x20 [ 47.542375][ C1] __kcsan_check_watchpoint+0x0/0x180 [ 47.547732][ C1] virtqueue_add+0xa3d/0x1a80 [ 47.552389][ C1] virtqueue_add_inbuf_ctx+0x50/0x6a [ 47.557658][ C1] try_fill_recv+0x68e/0xdc0 [ 47.562223][ C1] virtnet_poll+0x64c/0x7d0 [ 47.566760][ C1] net_rx_action+0x3ae/0xa50 [ 47.571337][ C1] [ 47.573637][ C1] Reported by Kernel Concurrency Sanitizer on: [ 47.579765][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 47.586754][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.596780][ C1] ================================================================== [ 47.604825][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 47.611390][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.3.0+ #0 [ 47.618380][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.628407][ C1] Call Trace: [ 47.631692][ C1] [ 47.634524][ C1] dump_stack+0xf5/0x159 [ 47.638748][ C1] panic+0x209/0x639 [ 47.642621][ C1] ? virtqueue_add+0xa3d/0x1a80 [ 47.647452][ C1] ? vprintk_func+0x8d/0x140 [ 47.652022][ C1] kcsan_report.cold+0xc/0x1b [ 47.656677][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 47.662212][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.667832][ C1] __tsan_read8+0x2c/0x30 [ 47.672155][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 47.677591][ C1] tick_sched_do_timer+0xd4/0xe0 [ 47.682504][ C1] tick_sched_timer+0x43/0xe0 [ 47.687162][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.692338][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 47.697441][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.702362][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.707799][ C1] apic_timer_interrupt+0xf/0x20 [ 47.712720][ C1] [ 47.715637][ C1] RIP: 0010:__kcsan_check_watchpoint+0x0/0x180 [ 47.721768][ C1] Code: 7e a9 00 01 1f 00 75 10 65 48 8b 04 25 40 6c 01 00 89 b8 e4 09 00 00 c3 65 89 3d 5f 97 af 7e c3 66 2e 0f 1f 84 00 00 00 00 00 <0f> b6 0d d9 57 b1 04 31 c0 84 c9 0f 84 53 01 00 00 55 41 89 d0 65 [ 47.741345][ C1] RSP: 0018:ffffc90000cf3ae8 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 [ 47.749730][ C1] RAX: 000000000000480e RBX: 000000000000480f RCX: 000000000000078a [ 47.757684][ C1] RDX: 0000000000000001 RSI: 0000000000000002 RDI: ffff88821aa9aa32 [ 47.765728][ C1] RBP: ffffc90000cf3af8 R08: 0000000000000000 R09: 000088821aa9aa33 [ 47.773674][ C1] R10: 00000000aaaaaaab R11: ffffffff86042ce8 R12: ffff88821aa9aa32 [ 47.781637][ C1] R13: ffff88821aa9aa20 R14: ffff888128db0000 R15: ffff88821aa9a9c0 [ 47.789612][ C1] ? __tsan_write2+0x18/0x40 [ 47.794182][ C1] virtqueue_add+0xa3d/0x1a80 [ 47.798837][ C1] ? __alloc_pages_nodemask+0x270/0x4d0 [ 47.804390][ C1] virtqueue_add_inbuf_ctx+0x50/0x6a [ 47.809656][ C1] try_fill_recv+0x68e/0xdc0 [ 47.814219][ C1] ? __kcsan_setup_watchpoint+0x96/0x510 [ 47.819830][ C1] virtnet_poll+0x64c/0x7d0 [ 47.824331][ C1] ? __sanitizer_cov_trace_cmp2+0x18/0x20 [ 47.830044][ C1] net_rx_action+0x3ae/0xa50 [ 47.834638][ C1] __do_softirq+0x115/0x33f [ 47.839123][ C1] ? takeover_tasklets+0x250/0x250 [ 47.844209][ C1] run_ksoftirqd+0x46/0x60 [ 47.848617][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 47.853533][ C1] kthread+0x1d4/0x200 [ 47.857597][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 47.863564][ C1] ? kthread_bind+0x50/0x50 [ 47.868046][ C1] ret_from_fork+0x1f/0x30 [ 47.873890][ C1] Kernel Offset: disabled [ 47.878234][ C1] Rebooting in 86400 seconds..