[ 61.678476][ T27] audit: type=1800 audit(1580911475.266:27): pid=7820 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [ 61.712063][ T27] audit: type=1800 audit(1580911475.266:28): pid=7820 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="ssh" dev="sda1" ino=2450 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. [ 62.538049][ T27] audit: type=1800 audit(1580911476.206:29): pid=7820 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 62.558430][ T27] audit: type=1800 audit(1580911476.206:30): pid=7820 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.104' (ECDSA) to the list of known hosts. 2020/02/05 14:04:43 fuzzer started 2020/02/05 14:04:45 dialing manager at 10.128.0.105:44419 2020/02/05 14:04:46 syscalls: 2904 2020/02/05 14:04:46 code coverage: enabled 2020/02/05 14:04:46 comparison tracing: enabled 2020/02/05 14:04:46 extra coverage: enabled 2020/02/05 14:04:46 setuid sandbox: enabled 2020/02/05 14:04:46 namespace sandbox: enabled 2020/02/05 14:04:46 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/05 14:04:46 fault injection: enabled 2020/02/05 14:04:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/05 14:04:46 net packet injection: enabled 2020/02/05 14:04:46 net device setup: enabled 2020/02/05 14:04:46 concurrency sanitizer: enabled 2020/02/05 14:04:46 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/02/05 14:04:49 adding functions to KCSAN blacklist: 'tomoyo_supervisor' 'xas_clear_mark' 'find_next_bit' 'blk_mq_get_request' 'tick_nohz_idle_stop_tick' '__rb_rotate_set_parents' 'ext4_nonda_switch' 'l2tp_tunnel_del_work' 'rcu_gp_fqs_check_wake' 'do_syslog' 'mod_timer' '__hrtimer_run_queues' 'taskstats_exit' 'run_timer_softirq' 'vm_area_dup' '__ext4_new_inode' 'tick_sched_do_timer' 'ep_poll' syzkaller login: [ 85.627358][ T0] ================================================================== [ 85.635532][ T0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 85.644459][ T0] [ 85.646796][ T0] write to 0xffffffff8624c7c8 of 8 bytes by interrupt on cpu 1: [ 85.654560][ T0] tick_do_update_jiffies64+0x100/0x250 [ 85.660114][ T0] tick_sched_do_timer+0xd4/0xe0 [ 85.665060][ T0] tick_sched_timer+0x43/0xe0 [ 85.669751][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 85.674955][ T0] hrtimer_interrupt+0x22a/0x480 [ 85.679904][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 85.685474][ T0] apic_timer_interrupt+0xf/0x20 [ 85.690421][ T0] __tsan_read2+0x6a/0x100 [ 85.694842][ T0] ipt_do_table+0x70/0xe60 [ 85.699268][ T0] iptable_mangle_hook+0x7a/0x260 [ 85.704309][ T0] nf_hook_slow+0x83/0x160 [ 85.708720][ T0] ip_local_deliver+0x1e5/0x210 [ 85.714612][ T0] ip_sublist_rcv_finish+0xf8/0x140 [ 85.719794][ T0] ip_sublist_rcv+0x418/0x550 [ 85.724458][ T0] ip_list_rcv+0x2f5/0x322 [ 85.728861][ T0] __netif_receive_skb_list_core+0x350/0x5c0 [ 85.734832][ T0] netif_receive_skb_list_internal+0x5d8/0x830 [ 85.741214][ T0] gro_normal_list.part.0+0x3a/0xb0 [ 85.746425][ T0] gro_normal_one+0x162/0x170 [ 85.751143][ T0] napi_gro_receive+0x288/0x300 [ 85.755992][ T0] receive_buf+0x284/0x30b0 [ 85.760508][ T0] virtnet_poll+0x436/0x7d0 [ 85.764998][ T0] net_rx_action+0x3ae/0xa90 [ 85.769582][ T0] __do_softirq+0x115/0x33f [ 85.774077][ T0] run_ksoftirqd+0x46/0x60 [ 85.778477][ T0] smpboot_thread_fn+0x37d/0x4a0 [ 85.783405][ T0] kthread+0x1d4/0x200 [ 85.787468][ T0] ret_from_fork+0x1f/0x30 [ 85.792777][ T0] [ 85.795531][ T0] read to 0xffffffff8624c7c8 of 8 bytes by task 0 on cpu 0: [ 85.802818][ T0] tick_do_update_jiffies64+0x2b/0x250 [ 85.808268][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 85.814179][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 85.820092][ T0] do_idle+0xb1/0x290 [ 85.824118][ T0] cpu_startup_entry+0x1b/0x20 [ 85.829007][ T0] rest_init+0xec/0xf6 [ 85.833070][ T0] arch_call_rest_init+0x17/0x37 [ 85.838004][ T0] start_kernel+0x838/0x85e [ 85.842617][ T0] x86_64_start_reservations+0x29/0x2b [ 85.848166][ T0] x86_64_start_kernel+0x72/0x76 [ 85.854295][ T0] secondary_startup_64+0xa4/0xb0 [ 85.859583][ T0] [ 85.862851][ T0] Reported by Kernel Concurrency Sanitizer on: [ 85.869226][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 85.877369][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.887501][ T0] ================================================================== [ 85.895732][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 85.902975][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.5.0-rc1-syzkaller #0 [ 85.910892][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 85.920934][ T0] Call Trace: [ 85.924214][ T0] dump_stack+0x11d/0x181 [ 85.928533][ T0] panic+0x210/0x640 [ 85.932417][ T0] ? vprintk_func+0x8d/0x140 [ 85.937006][ T0] kcsan_report.cold+0xc/0xd [ 85.941602][ T0] kcsan_setup_watchpoint+0x3fe/0x460 [ 85.946959][ T0] __tsan_read8+0xc6/0x100 [ 85.951370][ T0] tick_do_update_jiffies64+0x2b/0x250 [ 85.956847][ T0] __tick_nohz_idle_restart_tick+0x31/0x1b0 [ 85.962734][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 85.967868][ T0] do_idle+0xb1/0x290 [ 85.971838][ T0] cpu_startup_entry+0x1b/0x20 [ 85.976644][ T0] rest_init+0xec/0xf6 [ 85.980789][ T0] ? trace_event_define_fields_vector_free_moved+0xb4/0xb4 [ 85.988094][ T0] arch_call_rest_init+0x17/0x37 [ 85.993099][ T0] start_kernel+0x838/0x85e [ 85.997598][ T0] x86_64_start_reservations+0x29/0x2b [ 86.003046][ T0] x86_64_start_kernel+0x72/0x76 [ 86.008028][ T0] secondary_startup_64+0xa4/0xb0 [ 86.014511][ T0] Kernel Offset: disabled [ 86.018840][ T0] Rebooting in 86400 seconds..