[info] Using makefile-style concurrent boot in runlevel 2. [ 48.185440][ T27] audit: type=1800 audit(1578912890.059:21): 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 [ 48.233193][ T27] audit: type=1800 audit(1578912890.059:22): 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 '10.128.0.132' (ECDSA) to the list of known hosts. 2020/01/13 10:55:00 fuzzer started 2020/01/13 10:55:01 dialing manager at 10.128.0.105:37871 2020/01/13 10:55:01 checking machine... 2020/01/13 10:55:01 checking revisions... 2020/01/13 10:55:01 testing simple program... syzkaller login: [ 59.981400][ T7864] IPVS: ftp: loaded support on port[0] = 21 2020/01/13 10:55:01 building call list... [ 60.349730][ T371] tipc: TX() has been purged, node left! [ 60.609995][ T2411] ================================================================== [ 60.618132][ T2411] BUG: KCSAN: data-race in find_next_bit / rcu_report_exp_cpu_mult [ 60.626008][ T2411] [ 60.628336][ T2411] write to 0xffffffff85c7d080 of 8 bytes by interrupt on cpu 0: [ 60.637365][ T2411] rcu_report_exp_cpu_mult+0x4f/0xa0 [ 60.642651][ T2411] rcu_report_exp_rdp+0x6c/0x90 [ 60.647502][ T2411] rcu_exp_handler+0xe5/0x190 [ 60.652171][ T2411] flush_smp_call_function_queue+0x18c/0x2b0 [ 60.658153][ T2411] generic_smp_call_function_single_interrupt+0x1c/0x49 [ 60.665096][ T2411] smp_call_function_single_interrupt+0x3f/0x100 [ 60.671427][ T2411] call_function_single_interrupt+0xf/0x20 [ 60.677229][ T2411] __tsan_read1+0x66/0x100 [ 60.681651][ T2411] number+0x580/0x7b0 [ 60.685631][ T2411] pointer+0x2fa/0x4e0 [ 60.689695][ T2411] vsnprintf+0x342/0xb40 [ 60.693930][ T2411] seq_vprintf+0xaa/0xf0 [ 60.698165][ T2411] seq_printf+0x6c/0x90 [ 60.702428][ T2411] s_show+0x189/0x1b0 [ 60.706418][ T2411] seq_read+0x7bb/0x9d0 [ 60.710568][ T2411] proc_reg_read+0xe9/0x140 [ 60.715074][ T2411] __vfs_read+0x67/0xc0 [ 60.719240][ T2411] vfs_read+0x143/0x2c0 [ 60.723395][ T2411] ksys_read+0xd5/0x1b0 [ 60.727550][ T2411] __x64_sys_read+0x4c/0x60 [ 60.732057][ T2411] do_syscall_64+0xcc/0x3a0 [ 60.736567][ T2411] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 60.742449][ T2411] [ 60.744807][ T2411] read to 0xffffffff85c7d080 of 8 bytes by task 2411 on cpu 1: [ 60.752348][ T2411] find_next_bit+0x57/0xe0 [ 60.756772][ T2411] sync_rcu_exp_select_node_cpus+0x28e/0x510 [ 60.762760][ T2411] sync_rcu_exp_select_cpus+0x30c/0x590 [ 60.768311][ T2411] wait_rcu_exp_gp+0x25/0x40 [ 60.772905][ T2411] process_one_work+0x3d4/0x890 [ 60.777775][ T2411] worker_thread+0xa0/0x800 [ 60.782292][ T2411] kthread+0x1d4/0x200 [ 60.786372][ T2411] ret_from_fork+0x1f/0x30 [ 60.790777][ T2411] [ 60.793112][ T2411] Reported by Kernel Concurrency Sanitizer on: [ 60.799285][ T2411] CPU: 1 PID: 2411 Comm: kworker/1:2 Not tainted 5.5.0-rc1-syzkaller #0 [ 60.807618][ T2411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.817744][ T2411] Workqueue: rcu_gp wait_rcu_exp_gp [ 60.822940][ T2411] ================================================================== [ 60.830993][ T2411] Kernel panic - not syncing: panic_on_warn set ... [ 60.838107][ T2411] CPU: 1 PID: 2411 Comm: kworker/1:2 Not tainted 5.5.0-rc1-syzkaller #0 [ 60.846427][ T2411] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.856493][ T2411] Workqueue: rcu_gp wait_rcu_exp_gp [ 60.861674][ T2411] Call Trace: [ 60.864969][ T2411] dump_stack+0x11d/0x181 [ 60.869307][ T2411] panic+0x210/0x640 [ 60.873210][ T2411] ? vprintk_func+0x8d/0x140 [ 60.877811][ T2411] kcsan_report.cold+0xc/0xd [ 60.882411][ T2411] kcsan_setup_watchpoint+0x3fe/0x460 [ 60.887786][ T2411] __tsan_read8+0xc6/0x100 [ 60.892203][ T2411] find_next_bit+0x57/0xe0 [ 60.896642][ T2411] sync_rcu_exp_select_node_cpus+0x28e/0x510 [ 60.902631][ T2411] sync_rcu_exp_select_cpus+0x30c/0x590 [ 60.908182][ T2411] wait_rcu_exp_gp+0x25/0x40 [ 60.912778][ T2411] process_one_work+0x3d4/0x890 [ 60.917642][ T2411] worker_thread+0xa0/0x800 [ 60.922155][ T2411] kthread+0x1d4/0x200 [ 60.926225][ T2411] ? rescuer_thread+0x6a0/0x6a0 [ 60.931073][ T2411] ? kthread_unpark+0xe0/0xe0 [ 60.935752][ T2411] ret_from_fork+0x1f/0x30 [ 60.941573][ T2411] Kernel Offset: disabled [ 60.945900][ T2411] Rebooting in 86400 seconds..