[info] Using makefile-style concurrent boot in runlevel 2. [ 43.250568][ T26] audit: type=1800 audit(1571903573.119:21): pid=7082 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.285589][ T26] audit: type=1800 audit(1571903573.119:22): pid=7082 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 '10.128.1.33' (ECDSA) to the list of known hosts. 2019/10/24 07:53:04 fuzzer started 2019/10/24 07:53:05 dialing manager at 10.128.0.105:42135 2019/10/24 07:53:06 syscalls: 2524 2019/10/24 07:53:06 code coverage: enabled 2019/10/24 07:53:06 comparison tracing: enabled 2019/10/24 07:53:06 extra coverage: extra coverage is not supported by the kernel 2019/10/24 07:53:06 setuid sandbox: enabled 2019/10/24 07:53:06 namespace sandbox: enabled 2019/10/24 07:53:06 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/24 07:53:06 fault injection: enabled 2019/10/24 07:53:06 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/24 07:53:06 net packet injection: enabled 2019/10/24 07:53:06 net device setup: enabled 2019/10/24 07:53:06 concurrency sanitizer: enabled 2019/10/24 07:53:11 adding functions to KCSAN blacklist: '__tcp_select_window' 'tcp_add_backlog' 'ext4_free_inode' 'process_srcu' 'tick_do_update_jiffies64' 'tcp_poll' 'tomoyo_supervisor' 'find_get_pages_range_tag' 'vm_area_dup' 'rcu_gp_fqs_check_wake' 'ep_poll' 'do_nanosleep' 'tick_sched_do_timer' 'generic_permission' 'find_next_bit' '__nf_ct_refresh_acct' 'get_task_cred' 'ktime_get_real_seconds' 'taskstats_exit' 'add_timer' '__hrtimer_run_queues' 'run_timer_softirq' 'poll_schedule_timeout' syzkaller login: [ 61.440673][ T7250] KCSAN: could not find function: 'poll_schedule_timeout' [ 67.169701][ T0] ================================================================== [ 67.177851][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 67.184762][ T0] [ 67.187679][ T0] read to 0xffff88812be1b6e4 of 1 bytes by task 7248 on cpu 1: [ 67.195212][ T0] mod_timer+0x50d/0x7a0 [ 67.199446][ T0] sk_reset_timer+0x2d/0x70 [ 67.203931][ T0] tcp_rearm_rto.part.0+0x190/0x240 [ 67.209107][ T0] tcp_rearm_rto+0x4f/0x60 [ 67.213553][ T0] tcp_event_new_data_sent+0x1bb/0x1c0 [ 67.218987][ T0] tcp_write_xmit+0xa16/0x3080 [ 67.223728][ T0] __tcp_push_pending_frames+0x7b/0x1d0 [ 67.229249][ T0] tcp_push+0x1e9/0x3d0 [ 67.233381][ T0] tcp_sendmsg_locked+0x1d1e/0x1f30 [ 67.238564][ T0] tcp_sendmsg+0x39/0x60 [ 67.242868][ T0] inet_sendmsg+0x6d/0x90 [ 67.247174][ T0] sock_sendmsg+0x9f/0xc0 [ 67.251477][ T0] sock_write_iter+0x16b/0x210 [ 67.256214][ T0] new_sync_write+0x388/0x4a0 [ 67.260876][ T0] [ 67.263182][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 67.270711][ T0] timer_clear_idle+0x42/0x50 [ 67.275462][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.281339][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.286423][ T0] do_idle+0xb1/0x280 [ 67.290384][ T0] cpu_startup_entry+0x1b/0x20 [ 67.295125][ T0] rest_init+0xec/0xf6 [ 67.299168][ T0] arch_call_rest_init+0x17/0x37 [ 67.304088][ T0] start_kernel+0x838/0x85e [ 67.308577][ T0] x86_64_start_reservations+0x29/0x2b [ 67.314010][ T0] x86_64_start_kernel+0x72/0x76 [ 67.318974][ T0] secondary_startup_64+0xa4/0xb0 [ 67.323971][ T0] [ 67.326276][ T0] Reported by Kernel Concurrency Sanitizer on: [ 67.332419][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.339591][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.349730][ T0] ================================================================== [ 67.357780][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 67.364360][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 67.371453][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 67.381492][ T0] Call Trace: [ 67.384770][ T0] dump_stack+0xf5/0x159 [ 67.388995][ T0] panic+0x210/0x640 [ 67.392874][ T0] ? x86_64_start_reservations+0x29/0x2b [ 67.398501][ T0] ? vprintk_func+0x8d/0x140 [ 67.403085][ T0] kcsan_report.cold+0xc/0x10 [ 67.407741][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 67.413274][ T0] __tsan_write1+0x32/0x40 [ 67.417674][ T0] timer_clear_idle+0x42/0x50 [ 67.422340][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 67.428213][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 67.433311][ T0] do_idle+0xb1/0x280 [ 67.437273][ T0] cpu_startup_entry+0x1b/0x20 [ 67.442013][ T0] rest_init+0xec/0xf6 [ 67.446060][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 67.453229][ T0] arch_call_rest_init+0x17/0x37 [ 67.458142][ T0] start_kernel+0x838/0x85e [ 67.462621][ T0] x86_64_start_reservations+0x29/0x2b [ 67.468063][ T0] x86_64_start_kernel+0x72/0x76 [ 67.472977][ T0] secondary_startup_64+0xa4/0xb0 [ 67.479309][ T0] Kernel Offset: disabled [ 67.483629][ T0] Rebooting in 86400 seconds..