[info] Using makefile-style concurrent boot in runlevel 2.
[   45.922147][   T27] audit: type=1800 audit(1581459725.835:21): pid=7782 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   45.949386][   T27] audit: type=1800 audit(1581459725.835:22): pid=7782 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 '10.128.0.247' (ECDSA) to the list of known hosts.
2020/02/11 22:22:18 fuzzer started
2020/02/11 22:22:20 dialing manager at 10.128.0.105:33799
2020/02/11 22:22:20 syscalls: 2904
2020/02/11 22:22:20 code coverage: enabled
2020/02/11 22:22:20 comparison tracing: enabled
2020/02/11 22:22:20 extra coverage: enabled
2020/02/11 22:22:20 setuid sandbox: enabled
2020/02/11 22:22:20 namespace sandbox: enabled
2020/02/11 22:22:20 Android sandbox: /sys/fs/selinux/policy does not exist
2020/02/11 22:22:20 fault injection: enabled
2020/02/11 22:22:20 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/02/11 22:22:20 net packet injection: enabled
2020/02/11 22:22:20 net device setup: enabled
2020/02/11 22:22:20 concurrency sanitizer: enabled
2020/02/11 22:22:20 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/02/11 22:22:26 adding functions to KCSAN blacklist: 'wbt_done' 'kcm_rfree' 'run_timer_softirq' 'do_nanosleep' 'dccp_fin' 'dd_has_work' 'tick_nohz_next_event' 'vm_area_dup' 'xas_clear_mark' 'ext4_mark_iloc_dirty' 'blk_mq_sched_dispatch_requests' '__mark_inode_dirty' 'inode_sync_complete' 'ep_poll' 'generic_fillattr' '__ext4_new_inode' 'copy_process' 'audit_log_start' 'xas_find_marked' 'ext4_writepages' 'kauditd_thread' 'tick_sched_do_timer' 'generic_write_end' 'pcpu_alloc' 'ext4_has_free_clusters' 'mod_timer' 'add_timer' 'ext4_nonda_switch' 'wbt_issue' 'do_syslog' 'tick_do_update_jiffies64' 'blk_mq_dispatch_rq_list' 'ktime_get_real_seconds' 'taskstats_exit' '__snd_rawmidi_transmit_ack' 'ext4_free_inode' 'blk_mq_run_hw_queue' 'timer_clear_idle' 'tomoyo_supervisor' 'find_get_pages_range_tag' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'blk_mq_get_request' '__filemap_fdatawrite_range' 'echo_char' 
syzkaller login: [  165.844990][  T769] ==================================================================
[  165.853142][  T769] BUG: KCSAN: data-race in schedule_hrtimeout_range_clock / watchdog
[  165.861181][  T769] 
[  165.863511][  T769] write to 0xffff8881268a70d0 of 8 bytes by task 7940 on cpu 0:
[  165.871139][  T769]  schedule_hrtimeout_range_clock+0x14e/0x1e0
[  165.877193][  T769]  schedule_hrtimeout_range+0x34/0x50
[  165.882563][  T769]  poll_schedule_timeout.constprop.0+0x75/0xc0
[  165.888701][  T769]  do_select+0xd7f/0x1020
[  165.893012][  T769]  core_sys_select+0x312/0x680
[  165.897767][  T769]  do_pselect.constprop.0+0x11d/0x160
[  165.903125][  T769]  __x64_sys_pselect6+0x12e/0x170
[  165.908134][  T769]  do_syscall_64+0xcc/0x3a0
[  165.912631][  T769]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[  165.918503][  T769] 
[  165.920837][  T769] read to 0xffff8881268a70d0 of 8 bytes by task 769 on cpu 1:
[  165.928274][  T769]  watchdog+0x2b1/0x960
[  165.932420][  T769]  kthread+0x1d4/0x200
[  165.936472][  T769]  ret_from_fork+0x1f/0x30
[  165.940869][  T769] 
[  165.943298][  T769] Reported by Kernel Concurrency Sanitizer on:
[  165.949431][  T769] CPU: 1 PID: 769 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #0
[  165.957554][  T769] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  165.967605][  T769] ==================================================================
[  165.975823][  T769] Kernel panic - not syncing: panic_on_warn set ...
[  165.982408][  T769] CPU: 1 PID: 769 Comm: khungtaskd Not tainted 5.5.0-rc1-syzkaller #0
[  165.990636][  T769] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  166.000674][  T769] Call Trace:
[  166.003952][  T769]  dump_stack+0x11d/0x181
[  166.008267][  T769]  panic+0x210/0x640
[  166.012170][  T769]  ? vprintk_func+0x8d/0x140
[  166.016746][  T769]  kcsan_report.cold+0xc/0x15
[  166.021415][  T769]  kcsan_setup_watchpoint+0x2e2/0x380
[  166.026771][  T769]  __tsan_read8+0xc6/0x100
[  166.031344][  T769]  watchdog+0x2b1/0x960
[  166.035513][  T769]  ? constant_test_bit+0x12/0x30
[  166.040441][  T769]  kthread+0x1d4/0x200
[  166.044494][  T769]  ? __read_once_size.constprop.0+0x20/0x20
[  166.050371][  T769]  ? kthread_unpark+0xe0/0xe0
[  166.055037][  T769]  ret_from_fork+0x1f/0x30
[  166.060857][  T769] Kernel Offset: disabled
[  166.065195][  T769] Rebooting in 86400 seconds..