[....] 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.
[   52.106921][   T27] kauditd_printk_skb: 7 callbacks suppressed
[   52.106943][   T27] audit: type=1800 audit(1580229211.570:29): pid=7879 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0
[   52.133419][   T27] audit: type=1800 audit(1580229211.570:30): pid=7879 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0

Debian GNU/Linux 7 syzkaller ttyS0

Warning: Permanently added '10.128.1.45' (ECDSA) to the list of known hosts.
2020/01/28 16:33:42 fuzzer started
2020/01/28 16:33:43 dialing manager at 10.128.0.105:34991
2020/01/28 16:33:43 checking machine...
2020/01/28 16:33:43 checking revisions...
2020/01/28 16:33:44 testing simple program...
syzkaller login: [   64.833713][ T8052] IPVS: ftp: loaded support on port[0] = 21
2020/01/28 16:33:44 building call list...
[   65.235273][    T7] tipc: TX() has been purged, node left!
[   65.275441][   T12] ==================================================================
[   65.283582][   T12] BUG: KCSAN: data-race in find_next_bit / rcu_report_exp_cpu_mult
[   65.291552][   T12] 
[   65.294156][   T12] write to 0xffffffff85c7d080 of 8 bytes by interrupt on cpu 1:
[   65.301970][   T12]  rcu_report_exp_cpu_mult+0x4f/0xa0
[   65.307270][   T12]  rcu_report_exp_rdp+0x6c/0x90
[   65.312143][   T12]  rcu_exp_handler+0xe5/0x190
[   65.316996][   T12]  flush_smp_call_function_queue+0x18c/0x2b0
[   65.322993][   T12]  generic_smp_call_function_single_interrupt+0x1c/0x49
[   65.329935][   T12]  smp_call_function_single_interrupt+0x3f/0x100
[   65.336276][   T12]  call_function_single_interrupt+0xf/0x20
[   65.342091][   T12]  __tsan_read1+0x2d/0x100
[   65.346626][   T12]  string_nocheck+0xb5/0x100
[   65.351219][   T12]  string+0x97/0xa0
[   65.355051][   T12]  vsnprintf+0x574/0xb40
[   65.359302][   T12]  seq_vprintf+0xaa/0xf0
[   65.363582][   T12]  seq_printf+0x6c/0x90
[   65.367760][   T12]  s_show+0x189/0x1b0
[   65.371834][   T12]  seq_read+0x7bb/0x9d0
[   65.376098][   T12]  proc_reg_read+0xe9/0x140
[   65.380616][   T12]  __vfs_read+0x67/0xc0
[   65.384781][   T12]  vfs_read+0x143/0x2c0
[   65.388953][   T12]  ksys_read+0xd5/0x1b0
[   65.393115][   T12]  __x64_sys_read+0x4c/0x60
[   65.397657][   T12]  do_syscall_64+0xcc/0x3a0
[   65.402188][   T12]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
[   65.408073][   T12] 
[   65.410461][   T12] read to 0xffffffff85c7d080 of 8 bytes by task 12 on cpu 0:
[   65.417842][   T12]  find_next_bit+0x57/0xe0
[   65.422375][   T12]  sync_rcu_exp_select_node_cpus+0x28e/0x510
[   65.428713][   T12]  sync_rcu_exp_select_cpus+0x30c/0x590
[   65.434278][   T12]  wait_rcu_exp_gp+0x25/0x40
[   65.438890][   T12]  process_one_work+0x3d4/0x890
[   65.443775][   T12]  worker_thread+0xa0/0x800
[   65.448294][   T12]  kthread+0x1d4/0x200
[   65.452514][   T12]  ret_from_fork+0x1f/0x30
[   65.456921][   T12] 
[   65.459263][   T12] Reported by Kernel Concurrency Sanitizer on:
[   65.465425][   T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.5.0-rc1-syzkaller #0
[   65.473577][   T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.483890][   T12] Workqueue: rcu_gp wait_rcu_exp_gp
[   65.489097][   T12] ==================================================================
[   65.497320][   T12] Kernel panic - not syncing: panic_on_warn set ...
[   65.503936][   T12] CPU: 0 PID: 12 Comm: kworker/0:1 Not tainted 5.5.0-rc1-syzkaller #0
[   65.512112][   T12] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[   65.522312][   T12] Workqueue: rcu_gp wait_rcu_exp_gp
[   65.527618][   T12] Call Trace:
[   65.530936][   T12]  dump_stack+0x11d/0x181
[   65.535530][   T12]  panic+0x210/0x640
[   65.539452][   T12]  ? vprintk_func+0x8d/0x140
[   65.544056][   T12]  kcsan_report.cold+0xc/0xd
[   65.548649][   T12]  kcsan_setup_watchpoint+0x3fe/0x460
[   65.554078][   T12]  __tsan_read8+0xc6/0x100
[   65.558510][   T12]  find_next_bit+0x57/0xe0
[   65.562951][   T12]  sync_rcu_exp_select_node_cpus+0x28e/0x510
[   65.568963][   T12]  sync_rcu_exp_select_cpus+0x30c/0x590
[   65.574516][   T12]  wait_rcu_exp_gp+0x25/0x40
[   65.579141][   T12]  process_one_work+0x3d4/0x890
[   65.584017][   T12]  worker_thread+0xa0/0x800
[   65.588531][   T12]  kthread+0x1d4/0x200
[   65.592768][   T12]  ? rescuer_thread+0x6a0/0x6a0
[   65.597625][   T12]  ? kthread_unpark+0xe0/0xe0
[   65.602341][   T12]  ret_from_fork+0x1f/0x30
[   65.608244][   T12] Kernel Offset: disabled
[   65.612594][   T12] Rebooting in 86400 seconds..