Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. 2020/01/23 08:32:21 fuzzer started 2020/01/23 08:32:23 dialing manager at 10.128.0.105:37633 2020/01/23 08:32:24 syscalls: 2861 2020/01/23 08:32:24 code coverage: enabled 2020/01/23 08:32:24 comparison tracing: enabled 2020/01/23 08:32:24 extra coverage: enabled 2020/01/23 08:32:24 setuid sandbox: enabled 2020/01/23 08:32:24 namespace sandbox: enabled 2020/01/23 08:32:24 Android sandbox: /sys/fs/selinux/policy does not exist 2020/01/23 08:32:24 fault injection: enabled 2020/01/23 08:32:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/01/23 08:32:24 net packet injection: enabled 2020/01/23 08:32:24 net device setup: enabled 2020/01/23 08:32:24 concurrency sanitizer: enabled 2020/01/23 08:32:24 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 70.964261][ T7983] KCSAN: could not find function: 'poll_schedule_timeout' [ 72.917683][ T7983] KCSAN: could not find function: 'may_open' 2020/01/23 08:32:38 adding functions to KCSAN blacklist: 'timer_clear_idle' 'd_instantiate_new' 'n_tty_receive_buf_common' 'do_nanosleep' 'audit_log_start' 'ext4_mb_good_group' 'pid_update_inode' '__dev_queue_xmit' 'find_next_bit' 'pcpu_alloc' 'rcu_gp_fqs_check_wake' 'wbc_detach_inode' 'alloc_empty_file' 'do_syslog' 'lruvec_lru_size' 'futex_wait_queue_me' 'generic_file_read_iter' '__add_to_page_cache_locked' 'snd_seq_check_queue' 'ext4_writepages' '__filemap_fdatawrite_range' 'tick_do_update_jiffies64' 'blk_mq_dispatch_rq_list' 'ext4_free_inode' '__snd_rawmidi_transmit_ack' '__delete_from_page_cache' 'ext4_free_inodes_count' 'generic_update_time' 'blk_mq_sched_dispatch_requests' 'ext4_nonda_switch' 'blk_stat_add' 'process_srcu' 'dd_has_work' 'wbt_issue' 'yama_ptracer_del' 'enqueue_timer' 'poll_schedule_timeout' 'tick_sched_do_timer' 'queue_access_lock' 'bio_endio' 'shmem_file_read_iter' 'echo_char' 'blk_mq_run_hw_queue' 'page_counter_charge' 'tick_nohz_idle_stop_tick' 'ktime_get_real_seconds' 'may_open' 'del_timer' 'snd_seq_prioq_cell_out' 'ep_poll' '__rb_insert_augmented' 'clear_inode' 'tick_nohz_next_event' '__ext4_new_inode' 'wbt_done' '__skb_try_recv_from_queue' '__d_lookup_done' 'tomoyo_supervisor' 'find_get_pages_range_tag' 'mm_update_next_owner' 'find_alive_thread' 'kauditd_thread' 'xas_clear_mark' 'generic_fillattr' 'xas_find_marked' 'do_signal_stop' '__hrtimer_run_queues' 'taskstats_exit' 'rcu_gp_fqs_loop' 'evict' 'mark_buffer_dirty_inode' '__writeback_single_inode' 'generic_write_end' 'add_timer' 'mod_timer' 'atime_needs_update' 'vm_area_dup' 'kvm_mmu_notifier_invalidate_range_end' 'ext4_has_free_clusters' 'sit_tunnel_xmit' 'iomap_dio_bio_actor' 'tomoyo_domain_quota_is_ok' 'ondemand_readahead' 'pipe_double_lock' 'blk_mq_get_request' 'wbt_wait' 'run_timer_softirq' 'copy_process' '__mark_inode_dirty' [ 82.783289][ T21] ================================================================== [ 82.791485][ T21] BUG: KCSAN: data-race in __wb_update_bandwidth / percpu_counter_add_batch [ 82.800153][ T21] [ 82.802505][ T21] write to 0xffff888129629558 of 8 bytes by interrupt on cpu 1: [ 82.810149][ T21] percpu_counter_add_batch+0xca/0x150 [ 82.815628][ T21] test_clear_page_writeback+0x508/0x790 [ 82.821331][ T21] end_page_writeback+0x9e/0x190 [ 82.826316][ T21] ext4_finish_bio+0x40d/0x520 [ 82.831081][ T21] ext4_end_bio+0xd2/0x2f0 [ 82.835496][ T21] bio_endio+0x2fa/0x400 [ 82.839728][ T21] blk_update_request+0x427/0x7b0 [ 82.845153][ T21] scsi_end_request+0x6b/0x360 [ 82.849946][ T21] scsi_io_completion+0x11d/0xc80 [ 82.854990][ T21] scsi_finish_command+0x283/0x380 [ 82.860151][ T21] scsi_softirq_done+0x259/0x280 [ 82.865197][ T21] blk_done_softirq+0x1eb/0x250 [ 82.870195][ T21] __do_softirq+0x115/0x33f [ 82.874685][ T21] irq_exit+0xbb/0xe0 [ 82.878954][ T21] do_IRQ+0x81/0x130 [ 82.882849][ T21] ret_from_intr+0x0/0x21 [ 82.887158][ T21] [ 82.889480][ T21] read to 0xffff888129629558 of 8 bytes by task 21 on cpu 0: [ 82.897023][ T21] __wb_update_bandwidth+0xb0/0x3c0 [ 82.902219][ T21] wb_update_bandwidth+0x90/0xc0 [ 82.907152][ T21] wb_writeback+0x21d/0x6a0 [ 82.911756][ T21] wb_workfn+0x7bb/0x970 [ 82.915984][ T21] process_one_work+0x3d4/0x890 [ 82.920829][ T21] worker_thread+0xa0/0x800 [ 82.925326][ T21] kthread+0x1d4/0x200 [ 82.929405][ T21] ret_from_fork+0x1f/0x30 [ 82.933799][ T21] [ 82.936129][ T21] Reported by Kernel Concurrency Sanitizer on: [ 82.942276][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.5.0-rc1-syzkaller #0 [ 82.950506][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.960717][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 82.966697][ T21] ================================================================== [ 82.974892][ T21] Kernel panic - not syncing: panic_on_warn set ... [ 82.981477][ T21] CPU: 0 PID: 21 Comm: kworker/u4:1 Not tainted 5.5.0-rc1-syzkaller #0 [ 82.989981][ T21] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 83.000325][ T21] Workqueue: writeback wb_workfn (flush-8:0) [ 83.006723][ T21] Call Trace: [ 83.010014][ T21] dump_stack+0x11d/0x181 [ 83.014485][ T21] panic+0x210/0x640 [ 83.018391][ T21] ? vprintk_func+0x8d/0x140 [ 83.022989][ T21] kcsan_report.cold+0xc/0xd [ 83.027571][ T21] kcsan_setup_watchpoint+0x3fe/0x460 [ 83.033038][ T21] __tsan_read8+0xc6/0x100 [ 83.037452][ T21] __wb_update_bandwidth+0xb0/0x3c0 [ 83.042682][ T21] wb_update_bandwidth+0x90/0xc0 [ 83.047618][ T21] wb_writeback+0x21d/0x6a0 [ 83.052125][ T21] ? cpumask_next+0x35/0x40 [ 83.057084][ T21] wb_workfn+0x7bb/0x970 [ 83.061331][ T21] ? find_next_bit+0xcb/0xe0 [ 83.065976][ T21] process_one_work+0x3d4/0x890 [ 83.070899][ T21] worker_thread+0xa0/0x800 [ 83.075429][ T21] kthread+0x1d4/0x200 [ 83.079506][ T21] ? rescuer_thread+0x6a0/0x6a0 [ 83.084489][ T21] ? kthread_unpark+0xe0/0xe0 [ 83.089367][ T21] ret_from_fork+0x1f/0x30 [ 83.095344][ T21] Kernel Offset: disabled [ 83.099687][ T21] Rebooting in 86400 seconds..