[info] Using makefile-style concurrent boot in runlevel 2.
[   47.512846][   T27] audit: type=1800 audit(1581943616.423:21): pid=7849 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   47.559633][   T27] audit: type=1800 audit(1581943616.433:22): pid=7849 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 '10.128.0.49' (ECDSA) to the list of known hosts.
2020/02/17 12:47:07 fuzzer started
2020/02/17 12:47:09 dialing manager at 10.128.0.105:38853
2020/02/17 12:47:13 syscalls: 2910
2020/02/17 12:47:13 code coverage: enabled
2020/02/17 12:47:13 comparison tracing: enabled
2020/02/17 12:47:13 extra coverage: enabled
2020/02/17 12:47:13 setuid sandbox: enabled
2020/02/17 12:47:13 namespace sandbox: enabled
2020/02/17 12:47:13 Android sandbox: /sys/fs/selinux/policy does not exist
2020/02/17 12:47:13 fault injection: enabled
2020/02/17 12:47:13 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/02/17 12:47:13 net packet injection: enabled
2020/02/17 12:47:13 net device setup: enabled
2020/02/17 12:47:13 concurrency sanitizer: enabled
2020/02/17 12:47:13 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/02/17 12:47:15 adding functions to KCSAN blacklist: 'ext4_has_free_clusters' 'tick_sched_do_timer' '__ext4_new_inode' 'blk_mq_dispatch_rq_list' 'ext4_writepages' 'generic_write_end' 'ep_poll' 'find_get_pages_range_tag' 'generic_update_time' 'do_nanosleep' 'vm_area_dup' 'ext4_nonda_switch' 'ext4_mark_iloc_dirty' 'xas_clear_mark' 
syzkaller login: [   92.235657][    T0] ==================================================================
[   92.243791][    T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event
[   92.252350][    T0] 
[   92.254663][    T0] write to 0xffffffff85f05590 of 4 bytes by task 0 on cpu 1:
[   92.262150][    T0]  tick_nohz_idle_stop_tick+0x525/0x670
[   92.267679][    T0]  do_idle+0x1b8/0x290
[   92.271726][    T0]  cpu_startup_entry+0x1b/0x20
[   92.276466][    T0]  start_secondary+0x168/0x1b0
[   92.281208][    T0]  secondary_startup_64+0xa4/0xb0
[   92.286202][    T0] 
[   92.288512][    T0] read to 0xffffffff85f05590 of 4 bytes by task 0 on cpu 0:
[   92.295820][    T0]  tick_nohz_next_event+0x19d/0x370
[   92.300996][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   92.306517][    T0]  do_idle+0x1b8/0x290
[   92.310564][    T0]  cpu_startup_entry+0x1b/0x20
[   92.315305][    T0]  rest_init+0xec/0xf6
[   92.319352][    T0]  arch_call_rest_init+0x17/0x37
[   92.324292][    T0]  start_kernel+0xcd4/0xcfc
[   92.328776][    T0]  x86_64_start_reservations+0x29/0x2b
[   92.334471][    T0]  x86_64_start_kernel+0x72/0x76
[   92.339389][    T0]  secondary_startup_64+0xa4/0xb0
[   92.344382][    T0] 
[   92.346686][    T0] Reported by Kernel Concurrency Sanitizer on:
[   92.352816][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   92.360679][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   92.370718][    T0] ==================================================================
[   92.378757][    T0] Kernel panic - not syncing: panic_on_warn set ...
[   92.385367][    T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[   92.393233][    T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   92.403267][    T0] Call Trace:
[   92.406566][    T0]  dump_stack+0x11d/0x181
[   92.410937][    T0]  panic+0x210/0x640
[   92.414828][    T0]  ? vprintk_func+0x8d/0x140
[   92.419585][    T0]  kcsan_report.cold+0xc/0x1a
[   92.424262][    T0]  kcsan_setup_watchpoint+0x3a3/0x3e0
[   92.429621][    T0]  __tsan_read4+0xc6/0x100
[   92.434035][    T0]  tick_nohz_next_event+0x19d/0x370
[   92.439403][    T0]  tick_nohz_idle_stop_tick+0x3c2/0x670
[   92.444941][    T0]  ? debug_smp_processor_id+0x43/0x137
[   92.450424][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   92.456646][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   92.462869][    T0]  ? __sanitizer_cov_trace_const_cmp4+0x16/0x20
[   92.469127][    T0]  do_idle+0x1b8/0x290
[   92.473176][    T0]  ? debug_smp_processor_id+0x43/0x137
[   92.478652][    T0]  cpu_startup_entry+0x1b/0x20
[   92.483397][    T0]  rest_init+0xec/0xf6
[   92.487449][    T0]  arch_call_rest_init+0x17/0x37
[   92.492404][    T0]  start_kernel+0xcd4/0xcfc
[   92.496893][    T0]  x86_64_start_reservations+0x29/0x2b
[   92.502327][    T0]  x86_64_start_kernel+0x72/0x76
[   92.507245][    T0]  secondary_startup_64+0xa4/0xb0
[   92.513654][    T0] Kernel Offset: disabled
[   92.517977][    T0] Rebooting in 86400 seconds..