[ 42.572352][ T25] audit: type=1800 audit(1572676856.669:24): pid=7219 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 43.018016][ T25] audit: type=1800 audit(1572676857.209:25): pid=7219 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 43.045330][ T25] audit: type=1800 audit(1572676857.209:26): pid=7219 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 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 '10.128.0.216' (ECDSA) to the list of known hosts. 2019/11/02 06:41:07 fuzzer started 2019/11/02 06:41:09 dialing manager at 10.128.0.105:41349 2019/11/02 06:41:09 syscalls: 2540 2019/11/02 06:41:09 code coverage: enabled 2019/11/02 06:41:09 comparison tracing: enabled 2019/11/02 06:41:09 extra coverage: extra coverage is not supported by the kernel 2019/11/02 06:41:09 setuid sandbox: enabled 2019/11/02 06:41:09 namespace sandbox: enabled 2019/11/02 06:41:09 Android sandbox: /sys/fs/selinux/policy does not exist 2019/11/02 06:41:09 fault injection: enabled 2019/11/02 06:41:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/11/02 06:41:09 net packet injection: enabled 2019/11/02 06:41:09 net device setup: enabled 2019/11/02 06:41:09 concurrency sanitizer: enabled syzkaller login: [ 69.125991][ T7392] KCSAN: could not find function: 'poll_schedule_timeout' [ 72.421755][ T7392] KCSAN: could not find function: 'calc_wb_limits' 2019/11/02 06:41:31 adding functions to KCSAN blacklist: 'tick_do_update_jiffies64' '__nf_ct_refresh_acct' 'do_nanosleep' 'ktime_get_seconds' 'icmp_global_allow' 'kernfs_refresh_inode' 'inet_putpeer' 'task_dump_owner' 'kauditd_thread' '__skb_try_recv_from_queue' 'tick_nohz_idle_stop_tick' 'fasync_remove_entry' 'osq_lock' 'do_wait' 'snd_seq_prioq_cell_out' 'ext4_free_inode' 'datagram_poll' 'ext4_da_write_end' 'echo_char' 'blk_mq_dispatch_rq_list' 'pipe_wait' 'copy_creds' 'process_srcu' 'mm_update_next_owner' 'balance_dirty_pages' 'atime_needs_update' 'blk_mq_sched_dispatch_requests' 'shmem_file_read_iter' 'sit_tunnel_xmit' 'ip_finish_output2' 'ext4_has_free_clusters' 'xas_clear_mark' 'tomoyo_supervisor' 'copy_process' 'snd_seq_check_queue' '__dev_queue_xmit' 'ktime_get_real_seconds' 'find_get_pages_range_tag' 'kvm_write_tsc' 'add_timer_on' 'ext4_mark_iloc_dirty' '__hrtimer_run_queues' '__delete_from_page_cache' '__filemap_fdatawrite_range' 'kvm_arch_vcpu_load' 'common_perm_cond' 'tcp_poll' 'dd_has_work' 'blk_mq_get_request' '__skb_wait_for_more_packets' '__rb_erase_color' 'mem_cgroup_select_victim_node' 'blk_mq_run_hw_queue' '__do_page_fault' 'rcu_gp_fqs_check_wake' 'virtqueue_get_buf_ctx' 'find_next_bit' 'poll_schedule_timeout' '__alloc_file' 'page_counter_try_charge' 'ep_poll' 'generic_fillattr' 'generic_write_end' '__snd_rawmidi_transmit_ack' '__add_to_page_cache_locked' 'integrity_iint_find' 'tcp_add_backlog' 'vm_area_dup' '__find_get_block' 'install_new_memslots' 'shmem_add_to_page_cache' 'generic_permission' 'iput' 'audit_log_start' 'mod_timer' 'taskstats_exit' 'pid_update_inode' 'tick_sched_do_timer' 'calc_wb_limits' 'update_defense_level' '__acct_update_integrals' 'ksys_read' '__nf_conntrack_find_get' 'n_tty_receive_buf_common' 'wbt_issue' 'blk_stat_add' '__dentry_kill' 'run_timer_softirq' 'add_timer' 'xas_find_marked' 'p9_poll_workfn' 'ext4_nonda_switch' 'ext4_setattr' 'tcp_v4_rcv' 'list_lru_count_one' 'shmem_getpage_gfp' 'exit_signals' 'ext4_free_inodes_count' 'rcu_gp_fqs_loop' 'snapshot_refaults' '__mark_inode_dirty' 'do_syslog' 'pipe_poll' '__ext4_new_inode' 'timer_clear_idle' 'handle_mm_fault' [ 206.331986][ C1] ================================================================== [ 206.340128][ C1] BUG: KCSAN: data-race in ktime_get_with_offset / timekeeping_advance [ 206.348333][ C1] [ 206.350641][ C1] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 206.358417][ C1] timekeeping_advance+0x893/0xd80 [ 206.363501][ C1] update_wall_time+0x19/0x20 [ 206.368157][ C1] tick_do_update_jiffies64+0x1ae/0x260 [ 206.373678][ C1] tick_sched_do_timer+0xd4/0xe0 [ 206.378589][ C1] tick_sched_timer+0x43/0xe0 [ 206.383242][ C1] __hrtimer_run_queues+0x288/0x600 [ 206.388414][ C1] hrtimer_interrupt+0x22a/0x480 [ 206.393329][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 206.398796][ C1] apic_timer_interrupt+0xf/0x20 [ 206.403713][ C1] __sanitizer_cov_trace_const_cmp1+0x1b/0x20 [ 206.409775][ C1] dev_hard_start_xmit+0x3f5/0x430 [ 206.414872][ C1] sch_direct_xmit+0x2b3/0x870 [ 206.419609][ C1] __dev_queue_xmit+0x19c6/0x1b60 [ 206.424605][ C1] dev_queue_xmit+0x21/0x30 [ 206.429090][ C1] [ 206.431399][ C1] read to 0xffffffff86040b24 of 4 bytes by interrupt on cpu 1: [ 206.438913][ C1] ktime_get_with_offset+0x14d/0x230 [ 206.444171][ C1] netif_receive_skb_internal+0x13e/0x190 [ 206.449862][ C1] napi_gro_receive+0x28f/0x330 [ 206.454688][ C1] receive_buf+0x284/0x30b0 [ 206.459162][ C1] virtnet_poll+0x436/0x7d0 [ 206.463649][ C1] net_rx_action+0x3ae/0xa90 [ 206.468212][ C1] __do_softirq+0x115/0x33f [ 206.472695][ C1] run_ksoftirqd+0x46/0x60 [ 206.477083][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 206.482005][ C1] kthread+0x1d4/0x200 [ 206.486057][ C1] ret_from_fork+0x1f/0x30 [ 206.490438][ C1] [ 206.492741][ C1] Reported by Kernel Concurrency Sanitizer on: [ 206.498869][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 206.506206][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 206.516277][ C1] ================================================================== [ 206.524324][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 206.530889][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 206.538240][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 206.548265][ C1] Call Trace: [ 206.551576][ C1] dump_stack+0xf5/0x159 [ 206.555794][ C1] panic+0x210/0x640 [ 206.559698][ C1] ? smpboot_thread_fn+0x37d/0x4a0 [ 206.564793][ C1] ? vprintk_func+0x8d/0x140 [ 206.569388][ C1] kcsan_report.cold+0xc/0x10 [ 206.574058][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 206.579613][ C1] __tsan_read4+0x2c/0x30 [ 206.583920][ C1] ktime_get_with_offset+0x14d/0x230 [ 206.589544][ C1] netif_receive_skb_internal+0x13e/0x190 [ 206.595239][ C1] napi_gro_receive+0x28f/0x330 [ 206.600066][ C1] receive_buf+0x284/0x30b0 [ 206.604543][ C1] ? __tsan_write8+0x32/0x40 [ 206.609127][ C1] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 206.614560][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 206.620178][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 206.625785][ C1] virtnet_poll+0x436/0x7d0 [ 206.630269][ C1] net_rx_action+0x3ae/0xa90 [ 206.634839][ C1] __do_softirq+0x115/0x33f [ 206.639322][ C1] ? takeover_tasklets+0x250/0x250 [ 206.644406][ C1] run_ksoftirqd+0x46/0x60 [ 206.648796][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 206.653721][ C1] kthread+0x1d4/0x200 [ 206.657766][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 206.663722][ C1] ? kthread_stop+0x2d0/0x2d0 [ 206.668388][ C1] ret_from_fork+0x1f/0x30 [ 206.674217][ C1] Kernel Offset: disabled [ 206.678538][ C1] Rebooting in 86400 seconds..