[info] Using makefile-style concurrent boot in runlevel 2.
[   46.306336][   T27] audit: type=1800 audit(1578225727.907:21): pid=7699 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[   46.361521][   T27] audit: type=1800 audit(1578225727.907:22): pid=7699 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 '10.128.0.104' (ECDSA) to the list of known hosts.
2020/01/05 12:02:19 fuzzer started
2020/01/05 12:02:20 dialing manager at 10.128.0.105:45929
2020/01/05 12:02:20 checking machine...
2020/01/05 12:02:20 checking revisions...
2020/01/05 12:02:20 testing simple program...
syzkaller login: [   59.123637][ T7872] IPVS: ftp: loaded support on port[0] = 21
2020/01/05 12:02:20 building call list...
[   59.485021][  T590] tipc: TX() has been purged, node left!
[   59.895686][   T12] ==================================================================
[   59.903813][   T12] BUG: KCSAN: data-race in find_next_bit / rcu_report_exp_cpu_mult
[   59.911688][   T12] 
[   59.914012][   T12] write to 0xffffffff85c7d140 of 8 bytes by interrupt on cpu 1:
[   59.921658][   T12]  rcu_report_exp_cpu_mult+0x4f/0xa0
[   59.926941][   T12]  rcu_report_exp_rdp+0x6c/0x90
[   59.931796][   T12]  rcu_exp_handler+0xe5/0x190
[   59.936472][   T12]  flush_smp_call_function_queue+0x18c/0x2b0
[   59.942450][   T12]  generic_smp_call_function_single_interrupt+0x1c/0x49
[   59.949388][   T12]  smp_call_function_single_interrupt+0x3f/0x100
[   59.955717][   T12]  call_function_single_interrupt+0xf/0x20
[   59.961524][   T12]  __tsan_read8+0x8a/0x100
[   59.965941][   T12]  seq_vprintf+0xb5/0xf0
[   59.970181][   T12]  seq_printf+0x6c/0x90
[   59.974332][   T12]  s_show+0x189/0x1b0
[   59.978310][   T12]  seq_read+0x7bb/0x9d0
[   59.982475][   T12]  proc_reg_read+0xe9/0x140
[   59.986978][   T12]  __vfs_read+0x67/0xc0
[   59.991141][   T12]  vfs_read+0x143/0x2c0
[   59.995290][   T12]  ksys_read+0xd5/0x1b0
[   59.999444][   T12]  __x64_sys_read+0x4c/0x60
[   60.003948][   T12]  do_syscall_64+0xcc/0x3a0
[   60.008454][   T12]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   60.014343][   T12] 
[   60.016676][   T12] read to 0xffffffff85c7d140 of 8 bytes by task 12 on cpu 0:
[   60.024043][   T12]  find_next_bit+0x57/0xe0
[   60.028482][   T12]  sync_rcu_exp_select_node_cpus+0x28e/0x510
[   60.034463][   T12]  sync_rcu_exp_select_cpus+0x30c/0x590
[   60.040006][   T12]  wait_rcu_exp_gp+0x25/0x40
[   60.044593][   T12]  process_one_work+0x3d4/0x890
[   60.049458][   T12]  worker_thread+0xa0/0x800
[   60.053955][   T12]  kthread+0x1d4/0x200
[   60.058032][   T12]  ret_from_fork+0x1f/0x30
[   60.062431][   T12] 
[   60.064746][   T12] Reported by Kernel Concurrency Sanitizer on:
[   60.070901][   T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.5.0-rc1-syzkaller #0
[   60.079046][   T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   60.089126][   T12] Workqueue: rcu_gp wait_rcu_exp_gp
[   60.094321][   T12] ==================================================================
[   60.102381][   T12] Kernel panic - not syncing: panic_on_warn set ...
[   60.108971][   T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.5.0-rc1-syzkaller #0
[   60.117716][   T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   60.127771][   T12] Workqueue: rcu_gp wait_rcu_exp_gp
[   60.132959][   T12] Call Trace:
[   60.136253][   T12]  dump_stack+0x11d/0x181
[   60.140591][   T12]  panic+0x210/0x640
[   60.144484][   T12]  ? vprintk_func+0x8d/0x140
[   60.149080][   T12]  kcsan_report.cold+0xc/0xd
[   60.154113][   T12]  kcsan_setup_watchpoint+0x3fe/0x460
[   60.159489][   T12]  __tsan_read8+0xc6/0x100
[   60.163900][   T12]  find_next_bit+0x57/0xe0
[   60.168319][   T12]  sync_rcu_exp_select_node_cpus+0x28e/0x510
[   60.174306][   T12]  sync_rcu_exp_select_cpus+0x30c/0x590
[   60.179852][   T12]  wait_rcu_exp_gp+0x25/0x40
[   60.184455][   T12]  process_one_work+0x3d4/0x890
[   60.189313][   T12]  worker_thread+0xa0/0x800
[   60.193826][   T12]  kthread+0x1d4/0x200
[   60.197896][   T12]  ? rescuer_thread+0x6a0/0x6a0
[   60.202739][   T12]  ? kthread_unpark+0xe0/0xe0
[   60.207422][   T12]  ret_from_fork+0x1f/0x30
[   60.213106][   T12] Kernel Offset: disabled
[   60.217469][   T12] Rebooting in 86400 seconds..