[info] Using makefile-style concurrent boot in runlevel 2. [ 54.365196][ T27] audit: type=1800 audit(1581531033.981:21): pid=7698 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 54.419738][ T27] audit: type=1800 audit(1581531033.981:22): pid=7698 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.10.55' (ECDSA) to the list of known hosts. 2020/02/12 18:10:42 fuzzer started 2020/02/12 18:10:43 dialing manager at 10.128.0.105:43163 2020/02/12 18:10:44 syscalls: 2905 2020/02/12 18:10:44 code coverage: enabled 2020/02/12 18:10:44 comparison tracing: enabled 2020/02/12 18:10:44 extra coverage: enabled 2020/02/12 18:10:44 setuid sandbox: enabled 2020/02/12 18:10:44 namespace sandbox: enabled 2020/02/12 18:10:44 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/12 18:10:44 fault injection: enabled 2020/02/12 18:10:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/12 18:10:44 net packet injection: enabled 2020/02/12 18:10:44 net device setup: enabled 2020/02/12 18:10:44 concurrency sanitizer: enabled 2020/02/12 18:10:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/02/12 18:10:47 adding functions to KCSAN blacklist: 'vm_area_dup' 'ext4_free_inode' 'copy_process' 'generic_write_end' 'xas_clear_mark' 'audit_log_start' 'taskstats_exit' 'wbt_done' 'ext4_nonda_switch' 'do_signal_stop' 'n_tty_receive_buf_common' 'mod_timer' 'blk_mq_sched_dispatch_requests' 'wbt_issue' 'find_get_pages_range_tag' 'run_timer_softirq' '__lru_cache_add' 'tick_do_update_jiffies64' 'ktime_get_real_seconds' 'blk_mq_get_request' 'do_nanosleep' 'ext4_free_inodes_count' 'tomoyo_supervisor' 'ep_poll' 'kauditd_thread' syzkaller login: [ 94.450637][ T0] ================================================================== [ 94.458896][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 94.467023][ T0] [ 94.469373][ T0] write to 0xffffffff85ebb050 of 4 bytes by interrupt on cpu 0: [ 94.477032][ T0] tick_sched_do_timer+0xc0/0xe0 [ 94.481964][ T0] tick_sched_timer+0x43/0xe0 [ 94.486630][ T0] __hrtimer_run_queues+0x274/0x5f0 [ 94.491809][ T0] hrtimer_interrupt+0x22a/0x480 [ 94.496742][ T0] smp_apic_timer_interrupt+0xdc/0x280 [ 94.502203][ T0] apic_timer_interrupt+0xf/0x20 [ 94.507137][ T0] tcp_v4_do_rcv+0x1/0x520 [ 94.511539][ T0] ip_protocol_deliver_rcu+0x4d/0x420 [ 94.516907][ T0] ip_local_deliver_finish+0x110/0x140 [ 94.523398][ T0] ip_local_deliver+0x133/0x210 [ 94.528229][ T0] ip_sublist_rcv_finish+0xf8/0x140 [ 94.533404][ T0] ip_sublist_rcv+0x418/0x550 [ 94.538057][ T0] ip_list_rcv+0x2f5/0x322 [ 94.542455][ T0] __netif_receive_skb_list_core+0x350/0x5c0 [ 94.548416][ T0] netif_receive_skb_list_internal+0x5d8/0x830 [ 94.554548][ T0] gro_normal_list.part.0+0x3a/0xb0 [ 94.559724][ T0] gro_normal_one+0x162/0x170 [ 94.564381][ T0] napi_gro_receive+0x288/0x300 [ 94.569222][ T0] receive_buf+0x284/0x30b0 [ 94.573701][ T0] virtnet_poll+0x436/0x7d0 [ 94.578184][ T0] net_rx_action+0x3ae/0xa90 [ 94.582752][ T0] __do_softirq+0x115/0x33f [ 94.587492][ T0] run_ksoftirqd+0x46/0x60 [ 94.591896][ T0] smpboot_thread_fn+0x37d/0x4a0 [ 94.596810][ T0] kthread+0x1d4/0x200 [ 94.601031][ T0] ret_from_fork+0x1f/0x30 [ 94.605417][ T0] [ 94.607724][ T0] read to 0xffffffff85ebb050 of 4 bytes by task 0 on cpu 1: [ 94.614985][ T0] tick_nohz_next_event+0x19d/0x370 [ 94.620160][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 94.625684][ T0] do_idle+0x1b8/0x290 [ 94.629729][ T0] cpu_startup_entry+0x1b/0x20 [ 94.634482][ T0] start_secondary+0x168/0x1b0 [ 94.639223][ T0] secondary_startup_64+0xa4/0xb0 [ 94.644226][ T0] [ 94.646530][ T0] Reported by Kernel Concurrency Sanitizer on: [ 94.652660][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0 [ 94.660609][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.670637][ T0] ================================================================== [ 94.678673][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 94.685240][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.5.0-rc1-syzkaller #0 [ 94.693106][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 94.703147][ T0] Call Trace: [ 94.706415][ T0] dump_stack+0x11d/0x181 [ 94.710725][ T0] panic+0x210/0x640 [ 94.714601][ T0] ? vprintk_func+0x8d/0x140 [ 94.719172][ T0] kcsan_report.cold+0xc/0x15 [ 94.723851][ T0] kcsan_setup_watchpoint+0x2e2/0x380 [ 94.729208][ T0] __tsan_read4+0xc6/0x100 [ 94.733612][ T0] tick_nohz_next_event+0x19d/0x370 [ 94.738801][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 94.744333][ T0] ? debug_smp_processor_id+0x43/0x137 [ 94.749786][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 94.756010][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 94.762269][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 94.768497][ T0] do_idle+0x1b8/0x290 [ 94.772551][ T0] ? debug_smp_processor_id+0x3e/0x137 [ 94.778294][ T0] cpu_startup_entry+0x1b/0x20 [ 94.783072][ T0] start_secondary+0x168/0x1b0 [ 94.787821][ T0] secondary_startup_64+0xa4/0xb0 [ 94.794288][ T0] Kernel Offset: disabled [ 94.798616][ T0] Rebooting in 86400 seconds..