[   45.894081][   T26] audit: type=1800 audit(1585164315.418:21): pid=7610 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   45.935014][   T26] audit: type=1800 audit(1585164315.428:22): pid=7610 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.
[   46.964978][ T7677] sshd (7677) 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 '10.128.1.36' (ECDSA) to the list of known hosts.
2020/03/25 19:25:24 fuzzer started
2020/03/25 19:25:26 dialing manager at 10.128.0.105:36849
2020/03/25 19:25:34 syscalls: 2955
2020/03/25 19:25:34 code coverage: enabled
2020/03/25 19:25:34 comparison tracing: enabled
2020/03/25 19:25:34 extra coverage: enabled
2020/03/25 19:25:34 setuid sandbox: enabled
2020/03/25 19:25:34 namespace sandbox: enabled
2020/03/25 19:25:34 Android sandbox: /sys/fs/selinux/policy does not exist
2020/03/25 19:25:34 fault injection: enabled
2020/03/25 19:25:34 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/03/25 19:25:34 net packet injection: enabled
2020/03/25 19:25:34 net device setup: enabled
2020/03/25 19:25:34 concurrency sanitizer: enabled
2020/03/25 19:25:34 devlink PCI setup: PCI device 0000:00:10.0 is not available
syzkaller login: [   68.711274][ T7771] KCSAN: could not find function: '_find_next_bit'
2020/03/25 19:25:38 adding functions to KCSAN blacklist: 'blk_mq_get_request' 'blk_mq_dispatch_rq_list' 'generic_fillattr' 'do_nanosleep' 'atime_needs_update' 'do_syslog' 'ext4_nonda_switch' 'run_timer_softirq' 'ext4_has_free_clusters' 'generic_write_end' 'wbt_done' 'ext4_free_inodes_count' 'shmem_file_read_iter' 'tick_sched_do_timer' 'xas_clear_mark' 'blk_mq_sched_dispatch_requests' '__ext4_new_inode' 'audit_log_start' 'mod_timer' 'kauditd_thread' 'dd_has_work' '__delete_from_page_cache' 'wbt_issue' 'exit_signals' 'ep_poll' 'find_get_pages_range_tag' 'generic_file_read_iter' '_find_next_bit' 'copy_process' 'ext4_da_write_end' 'lruvec_lru_size' 'add_timer' 'ext4_mark_iloc_dirty' 'timer_clear_idle' 
[   69.129367][    T0] ==================================================================
[   69.137625][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_idle_stop_tick
[   69.146533][    T0] 
[   69.148846][    T0] write to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 0:
[   69.156378][    T0]  tick_nohz_idle_stop_tick+0x52c/0x680
[   69.161911][    T0]  do_idle+0x1ad/0x290
[   69.165964][    T0]  cpu_startup_entry+0x14/0x20
[   69.170725][    T0]  rest_init+0xe4/0xeb
[   69.174802][    T0]  arch_call_rest_init+0x13/0x2b
[   69.179802][    T0]  start_kernel+0xcc2/0xceb
[   69.184302][    T0]  secondary_startup_64+0xa4/0xb0
[   69.189297][    T0] 
[   69.191621][    T0] read to 0xffffffff85d056d0 of 4 bytes by task 0 on cpu 1:
[   69.198899][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   69.204517][    T0]  do_idle+0x1ad/0x290
[   69.208574][    T0]  cpu_startup_entry+0x14/0x20
[   69.213319][    T0]  start_secondary+0x164/0x1b0
[   69.218062][    T0]  secondary_startup_64+0xa4/0xb0
[   69.223065][    T0] 
[   69.225371][    T0] Reported by Kernel Concurrency Sanitizer on:
[   69.231507][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   69.239691][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.249744][    T0] ==================================================================
[   69.257890][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   69.264574][    T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0
[   69.274715][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   69.284787][    T0] Call Trace:
[   69.289295][    T0]  dump_stack+0x11d/0x187
[   69.293618][    T0]  panic+0x210/0x640
[   69.298039][    T0]  ? vprintk_func+0x89/0x13a
[   69.302638][    T0]  kcsan_report.cold+0xc/0xf
[   69.307224][    T0]  kcsan_setup_watchpoint+0x3fb/0x440
[   69.312617][    T0]  tick_nohz_idle_stop_tick+0x191/0x680
[   69.318165][    T0]  do_idle+0x1ad/0x290
[   69.322227][    T0]  cpu_startup_entry+0x14/0x20
[   69.326990][    T0]  start_secondary+0x164/0x1b0
[   69.331738][    T0]  secondary_startup_64+0xa4/0xb0
[   69.338168][    T0] Kernel Offset: disabled
[   69.342607][    T0] Rebooting in 86400 seconds..