[info] Using makefile-style concurrent boot in runlevel 2. [ 43.960199][ T27] audit: type=1800 audit(1585863693.285:21): pid=7638 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.015889][ T27] audit: type=1800 audit(1585863693.285:22): pid=7638 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 '10.128.0.191' (ECDSA) to the list of known hosts. 2020/04/02 21:41:44 fuzzer started 2020/04/02 21:41:46 dialing manager at 10.128.0.105:45605 2020/04/02 21:41:46 syscalls: 2955 2020/04/02 21:41:46 code coverage: enabled 2020/04/02 21:41:46 comparison tracing: enabled 2020/04/02 21:41:46 extra coverage: enabled 2020/04/02 21:41:46 setuid sandbox: enabled 2020/04/02 21:41:46 namespace sandbox: enabled 2020/04/02 21:41:46 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/02 21:41:46 fault injection: enabled 2020/04/02 21:41:46 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/02 21:41:46 net packet injection: enabled 2020/04/02 21:41:46 net device setup: enabled 2020/04/02 21:41:46 concurrency sanitizer: enabled 2020/04/02 21:41:46 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 61.176914][ T7807] KCSAN: could not find function: '_find_next_bit' [ 62.486644][ T7807] KCSAN: could not find function: 'poll_schedule_timeout' 2020/04/02 21:41:54 adding functions to KCSAN blacklist: 'direct_page_fault' 'ext4_free_inodes_count' 'timer_clear_idle' '__mark_inode_dirty' 'wbt_issue' 'ext4_mark_iloc_dirty' 'ext4_nonda_switch' 'generic_write_end' 'generic_fillattr' 'mod_timer' 'list_lru_count_one' 'pcpu_alloc' 'wbt_wait' 'complete_signal' 'ext4_writepages' 'file_remove_privs' 'futex_wait_queue_me' 'copyout' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'snd_seq_check_queue' 'find_get_pages_range_tag' '__add_to_page_cache_locked' 'get_signal' 'wbt_done' 'shmem_getpage_gfp' 'shmem_file_read_iter' 'ondemand_readahead' 'alloc_empty_file' 'do_exit' 'xas_find_marked' 'filemap_map_pages' 'page_counter_try_charge' 'blk_mq_run_hw_queue' '__remove_assoc_queue' '_find_next_bit' 'tick_sched_do_timer' '__wb_update_bandwidth' 'snd_seq_prioq_cell_out' 'audit_log_start' 'ext4_write_end' 'blk_mq_dispatch_rq_list' 'ktime_get_real_seconds' 'ext4_setattr' '__bpf_lru_node_move_in' 'poll_schedule_timeout' 'kauditd_thread' 'lruvec_lru_size' 'do_syslog' 'do_readlinkat' 'inode_permission' 'tick_nohz_idle_stop_tick' 'xas_clear_mark' '__delete_from_page_cache' 'generic_file_read_iter' '__lru_cache_add' 'get_cpu_iowait_time_us' 'ext4_mb_good_group' 'ext4_has_free_clusters' 'run_timer_softirq' 'echo_char' '__filemap_fdatawrite_range' 'atime_needs_update' 'blk_mq_get_request' 'percpu_counter_add_batch' '__snd_rawmidi_transmit_ack' 'page_counter_charge' 'fat16_ent_put' 'do_signal_stop' '__ext4_new_inode' 'ep_poll' 'copy_process' 'dd_has_work' 'add_timer' 'kcm_rfree' 'n_tty_receive_buf_common' 'delete_from_page_cache_batch' [ 185.035597][ T1078] ================================================================== [ 185.043754][ T1078] BUG: KCSAN: data-race in smpboot_thread_fn / watchdog [ 185.050687][ T1078] [ 185.053021][ T1078] write to 0xffff88812b772050 of 8 bytes by task 9 on cpu 0: [ 185.060389][ T1078] smpboot_thread_fn+0x325/0x4a0 [ 185.065329][ T1078] kthread+0x1cb/0x1f0 [ 185.069407][ T1078] ret_from_fork+0x1f/0x30 [ 185.073810][ T1078] [ 185.076139][ T1078] read to 0xffff88812b772050 of 8 bytes by task 1078 on cpu 1: [ 185.083750][ T1078] watchdog+0x2b8/0x960 [ 185.087903][ T1078] kthread+0x1cb/0x1f0 [ 185.091966][ T1078] ret_from_fork+0x1f/0x30 [ 185.096357][ T1078] [ 185.098940][ T1078] Reported by Kernel Concurrency Sanitizer on: [ 185.105692][ T1078] CPU: 1 PID: 1078 Comm: khungtaskd Not tainted 5.6.0-rc1-syzkaller #0 [ 185.113926][ T1078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 185.123975][ T1078] ================================================================== [ 185.132014][ T1078] Kernel panic - not syncing: panic_on_warn set ... [ 185.138597][ T1078] CPU: 1 PID: 1078 Comm: khungtaskd Not tainted 5.6.0-rc1-syzkaller #0 [ 185.146813][ T1078] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 185.157021][ T1078] Call Trace: [ 185.160302][ T1078] dump_stack+0x11d/0x187 [ 185.164626][ T1078] panic+0x210/0x640 [ 185.168610][ T1078] ? vprintk_func+0x89/0x13a [ 185.173201][ T1078] kcsan_report.cold+0xc/0xf [ 185.177815][ T1078] kcsan_setup_watchpoint+0x3fb/0x440 [ 185.183178][ T1078] watchdog+0x2b8/0x960 [ 185.187315][ T1078] ? constant_test_bit+0xd/0x30 [ 185.192147][ T1078] ? __read_once_size.constprop.0+0x20/0x20 [ 185.198133][ T1078] kthread+0x1cb/0x1f0 [ 185.202213][ T1078] ? kthread_unpark+0xd0/0xd0 [ 185.206898][ T1078] ret_from_fork+0x1f/0x30 [ 185.212873][ T1078] Kernel Offset: disabled [ 185.217237][ T1078] Rebooting in 86400 seconds..