[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.003011][ T25] audit: type=1800 audit(1570903884.240:25): pid=6986 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.022625][ T25] audit: type=1800 audit(1570903884.240:26): pid=6986 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.022639][ T25] audit: type=1800 audit(1570903884.240:27): pid=6986 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 '10.128.1.42' (ECDSA) to the list of known hosts. 2019/10/12 18:11:31 fuzzer started 2019/10/12 18:11:32 dialing manager at 10.128.0.105:43913 2019/10/12 18:11:32 syscalls: 2523 2019/10/12 18:11:32 code coverage: enabled 2019/10/12 18:11:32 comparison tracing: enabled 2019/10/12 18:11:32 extra coverage: extra coverage is not supported by the kernel 2019/10/12 18:11:32 setuid sandbox: enabled 2019/10/12 18:11:32 namespace sandbox: enabled 2019/10/12 18:11:32 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 18:11:32 fault injection: enabled 2019/10/12 18:11:32 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 18:11:32 net packet injection: enabled 2019/10/12 18:11:32 net device setup: enabled 2019/10/12 18:11:32 concurrency sanitizer: enabled syzkaller login: [ 45.795676][ C0] ================================================================== [ 45.803796][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 45.812698][ C0] [ 45.815002][ C0] write to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 1: [ 45.822608][ C0] tick_do_update_jiffies64+0x105/0x260 [ 45.828169][ C0] tick_sched_do_timer+0xd4/0xe0 [ 45.833083][ C0] tick_sched_timer+0x43/0xe0 [ 45.837736][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.842911][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.847824][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.853345][ C0] apic_timer_interrupt+0xf/0x20 [ 45.858265][ C0] __kcsan_check_watchpoint+0x51/0x180 [ 45.863705][ C0] __tsan_read4+0x15/0x30 [ 45.868068][ C0] ipt_do_table+0x51/0xe40 [ 45.872465][ C0] iptable_raw_hook+0x4a/0x60 [ 45.877122][ C0] nf_hook_slow+0x83/0x160 [ 45.881513][ C0] __ip_local_out+0x1f7/0x2b0 [ 45.886178][ C0] ip_local_out+0x31/0x90 [ 45.890475][ C0] [ 45.892791][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 45.900311][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 45.905744][ C0] tick_sched_do_timer+0xd4/0xe0 [ 45.910654][ C0] tick_sched_timer+0x43/0xe0 [ 45.915307][ C0] __hrtimer_run_queues+0x288/0x600 [ 45.920477][ C0] hrtimer_interrupt+0x22a/0x480 [ 45.925389][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 45.930820][ C0] apic_timer_interrupt+0xf/0x20 [ 45.935744][ C0] __kcsan_check_watchpoint+0xbb/0x180 [ 45.941176][ C0] __tsan_write8+0x18/0x40 [ 45.945568][ C0] tcp_gro_receive+0x6c7/0x7a0 [ 45.950316][ C0] tcp4_gro_receive+0x365/0x4b0 [ 45.955155][ C0] inet_gro_receive+0x7b5/0x800 [ 45.959978][ C0] dev_gro_receive+0xa05/0x1190 [ 45.964796][ C0] [ 45.967096][ C0] Reported by Kernel Concurrency Sanitizer on: [ 45.973223][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 45.980127][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.990165][ C0] ================================================================== [ 45.998197][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.004760][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.3.0+ #0 [ 46.011663][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.021701][ C0] Call Trace: [ 46.024955][ C0] [ 46.027786][ C0] dump_stack+0xf5/0x159 [ 46.032020][ C0] panic+0x209/0x639 [ 46.035901][ C0] ? __tsan_write8+0x18/0x40 [ 46.040478][ C0] ? vprintk_func+0x8d/0x140 [ 46.045043][ C0] kcsan_report.cold+0xc/0x1b [ 46.049710][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.055232][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.060841][ C0] __tsan_read8+0x2c/0x30 [ 46.065193][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 46.070632][ C0] tick_sched_do_timer+0xd4/0xe0 [ 46.075553][ C0] tick_sched_timer+0x43/0xe0 [ 46.080212][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.085389][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.090525][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.095446][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.100888][ C0] apic_timer_interrupt+0xf/0x20 [ 46.105798][ C0] [ 46.108715][ C0] RIP: 0010:__kcsan_check_watchpoint+0xbb/0x180 [ 46.114932][ C0] Code: 8d 44 1e ff 41 89 c3 41 c1 fb 1f 41 c1 eb 1a 44 01 d8 83 e0 3f 44 29 d8 48 98 4c 8d 1c c5 20 2c 04 86 48 8b 04 c5 20 2c 04 86 <48> 83 f8 01 76 2c 48 89 c3 49 89 c7 48 c1 eb 31 49 21 cf 81 e3 ff [ 46.141113][ C0] RSP: 0018:ffffc90000cb38c0 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 46.149502][ C0] RAX: 0000000000000000 RBX: 0000000000000002 RCX: 0000ffffffffffff [ 46.157451][ C0] RDX: 0000000000000002 RSI: 000000000000003e RDI: 00008881242fe828 [ 46.165394][ C0] RBP: ffffc90000cb38e8 R08: 0000000000000001 R09: 00008881242fe82f [ 46.173338][ C0] R10: 00000000aaaaaaab R11: ffffffff86042e18 R12: 0000000000000001 [ 46.181284][ C0] R13: ffff8881242fe828 R14: 0000000000000008 R15: 00000000000000b2 [ 46.189243][ C0] __tsan_write8+0x18/0x40 [ 46.193637][ C0] tcp_gro_receive+0x6c7/0x7a0 [ 46.198380][ C0] tcp4_gro_receive+0x365/0x4b0 [ 46.203211][ C0] inet_gro_receive+0x7b5/0x800 [ 46.208044][ C0] dev_gro_receive+0xa05/0x1190 [ 46.212886][ C0] napi_gro_receive+0x7c/0x330 [ 46.217631][ C0] receive_buf+0x284/0x30b0 [ 46.222114][ C0] ? __tsan_write8+0x32/0x40 [ 46.226689][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 46.232123][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.237734][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 46.243346][ C0] virtnet_poll+0x436/0x7d0 [ 46.247832][ C0] net_rx_action+0x3ae/0xa50 [ 46.252442][ C0] __do_softirq+0x115/0x33f [ 46.256984][ C0] ? takeover_tasklets+0x250/0x250 [ 46.262072][ C0] run_ksoftirqd+0x46/0x60 [ 46.266467][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 46.271381][ C0] kthread+0x1d4/0x200 [ 46.275428][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 46.281379][ C0] ? kthread_bind+0x50/0x50 [ 46.285869][ C0] ret_from_fork+0x1f/0x30 [ 46.291495][ C0] Kernel Offset: disabled [ 46.295815][ C0] Rebooting in 86400 seconds..