[ 45.549299][ T27] audit: type=1800 audit(1582865898.863:21): pid=7613 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 45.580640][ T27] audit: type=1800 audit(1582865898.873:22): pid=7613 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. [ 46.669191][ T7682] sshd (7682) used greatest stack depth: 10384 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.52' (ECDSA) to the list of known hosts. 2020/02/28 04:58:27 fuzzer started 2020/02/28 04:58:29 dialing manager at 10.128.0.105:45113 2020/02/28 04:58:29 syscalls: 2955 2020/02/28 04:58:29 code coverage: enabled 2020/02/28 04:58:29 comparison tracing: enabled 2020/02/28 04:58:29 extra coverage: enabled 2020/02/28 04:58:29 setuid sandbox: enabled 2020/02/28 04:58:29 namespace sandbox: enabled 2020/02/28 04:58:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/28 04:58:29 fault injection: enabled 2020/02/28 04:58:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/28 04:58:29 net packet injection: enabled 2020/02/28 04:58:29 net device setup: enabled 2020/02/28 04:58:29 concurrency sanitizer: enabled 2020/02/28 04:58:29 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 60.365266][ T7781] KCSAN: could not find function: '_find_next_bit' [ 61.521073][ T7781] KCSAN: could not find function: 'poll_schedule_timeout' 2020/02/28 04:58:35 adding functions to KCSAN blacklist: 'blk_mq_run_hw_queue' '__filemap_fdatawrite_range' 'ext4_has_free_clusters' 'ext4_mark_iloc_dirty' 'blk_mq_sched_dispatch_requests' 'snd_seq_check_queue' 'mod_timer' 'file_update_time' 'audit_log_start' 'kcm_rfree' 'atime_needs_update' 'find_alive_thread' 'tick_nohz_next_event' 'find_get_pages_range_tag' 'blk_mq_get_request' 'add_timer' 'page_counter_charge' 'dd_has_work' 'wbt_done' '__add_to_page_cache_locked' 'ktime_get_real_seconds' 'futex_wait_queue_me' 'snd_seq_prioq_cell_out' 'shmem_add_to_page_cache' 'echo_char' '__snd_rawmidi_transmit_ack' 'tick_sched_do_timer' 'generic_fillattr' 'ext4_nonda_switch' '__lru_cache_add' 'page_counter_try_charge' 'ep_poll' '__ext4_new_inode' 'do_syslog' 'run_timer_softirq' '__process_echoes' '_find_next_bit' 'do_nanosleep' 'copy_process' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'poll_schedule_timeout' 'do_sendfile' 'generic_write_end' 'kauditd_thread' 'vfs_unlink' 'snd_timer_pause' 'xas_clear_mark' 'lruvec_lru_size' [ 232.873078][ T0] ================================================================== [ 232.881360][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick [ 232.890368][ T0] [ 232.892691][ T0] write to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 1: [ 232.900264][ T0] tick_nohz_idle_stop_tick+0x52c/0x680 [ 232.906097][ T0] do_idle+0x1ad/0x290 [ 232.910218][ T0] cpu_startup_entry+0x14/0x20 [ 232.914989][ T0] start_secondary+0x164/0x1b0 [ 232.920234][ T0] secondary_startup_64+0xa4/0xb0 [ 232.925367][ T0] [ 232.927704][ T0] read to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 0: [ 232.935189][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 232.940911][ T0] do_idle+0x1ad/0x290 [ 232.944966][ T0] cpu_startup_entry+0x14/0x20 [ 232.949730][ T0] rest_init+0xe4/0xeb [ 232.954085][ T0] arch_call_rest_init+0x13/0x2b [ 232.959192][ T0] start_kernel+0xcc2/0xceb [ 232.963711][ T0] secondary_startup_64+0xa4/0xb0 [ 232.968713][ T0] [ 232.971049][ T0] Reported by Kernel Concurrency Sanitizer on: [ 232.977340][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 232.985209][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 232.995417][ T0] ================================================================== [ 233.003583][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 233.011169][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 233.019056][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 233.029100][ T0] Call Trace: [ 233.032393][ T0] dump_stack+0x11d/0x187 [ 233.037277][ T0] panic+0x210/0x640 [ 233.041201][ T0] ? vprintk_func+0x89/0x13a [ 233.045908][ T0] kcsan_report.cold+0xc/0x14 [ 233.050961][ T0] kcsan_setup_watchpoint+0x304/0x400 [ 233.056330][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 233.061877][ T0] do_idle+0x1ad/0x290 [ 233.065943][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 233.071414][ T0] cpu_startup_entry+0x14/0x20 [ 233.076602][ T0] rest_init+0xe4/0xeb [ 233.080658][ T0] arch_call_rest_init+0x13/0x2b [ 233.085594][ T0] start_kernel+0xcc2/0xceb [ 233.090097][ T0] secondary_startup_64+0xa4/0xb0 [ 233.096418][ T0] Kernel Offset: disabled [ 233.101038][ T0] Rebooting in 86400 seconds..