[info] Using makefile-style concurrent boot in runlevel 2. [ 47.720266][ T27] audit: type=1800 audit(1582730173.316:21): pid=7526 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 47.763194][ T27] audit: type=1800 audit(1582730173.326:22): pid=7526 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 '10.128.1.7' (ECDSA) to the list of known hosts. 2020/02/26 15:16:25 fuzzer started 2020/02/26 15:16:27 dialing manager at 10.128.0.105:41269 2020/02/26 15:16:29 syscalls: 2955 2020/02/26 15:16:29 code coverage: enabled 2020/02/26 15:16:29 comparison tracing: enabled 2020/02/26 15:16:29 extra coverage: enabled 2020/02/26 15:16:29 setuid sandbox: enabled 2020/02/26 15:16:29 namespace sandbox: enabled 2020/02/26 15:16:29 Android sandbox: /sys/fs/selinux/policy does not exist 2020/02/26 15:16:29 fault injection: enabled 2020/02/26 15:16:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/02/26 15:16:29 net packet injection: enabled 2020/02/26 15:16:29 net device setup: enabled 2020/02/26 15:16:29 concurrency sanitizer: enabled 2020/02/26 15:16:29 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 65.976041][ T7696] KCSAN: could not find function: '_find_next_bit' 2020/02/26 15:16:31 adding functions to KCSAN blacklist: 'blk_mq_get_request' '__ext4_new_inode' 'generic_fillattr' 'blk_mq_dispatch_rq_list' 'run_timer_softirq' 'n_tty_receive_buf_common' 'copy_process' 'ext4_has_free_clusters' 'ep_poll' 'generic_write_end' 'shmem_file_read_iter' 'mod_timer' 'get_cpu_iowait_time_us' 'wbt_issue' 'tick_nohz_idle_stop_tick' 'writeback_sb_inodes' 'do_syslog' '__snd_rawmidi_transmit_ack' 'find_get_pages_range_tag' '_find_next_bit' 'wbt_done' 'ext4_writepages' [ 88.603069][ T0] ================================================================== [ 88.611231][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 88.619371][ T0] [ 88.621703][ T0] write to 0xffffffff85d05610 of 4 bytes by interrupt on cpu 0: [ 88.629336][ T0] tick_sched_do_timer+0xb4/0xd0 [ 88.634278][ T0] tick_sched_timer+0x3f/0xd0 [ 88.638965][ T0] __hrtimer_run_queues+0x271/0x600 [ 88.644167][ T0] hrtimer_interrupt+0x226/0x490 [ 88.649548][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 88.655033][ T0] apic_timer_interrupt+0xf/0x20 [ 88.659974][ T0] kcsan_setup_watchpoint+0x2d3/0x400 [ 88.665359][ T0] ipt_do_table+0x52/0xe70 [ 88.669771][ T0] iptable_filter_hook+0x44/0x60 [ 88.674688][ T0] nf_hook_slow+0x7c/0x160 [ 88.679085][ T0] ip_local_deliver+0x1f2/0x220 [ 88.683917][ T0] ip_sublist_rcv_finish+0xf0/0x140 [ 88.689114][ T0] ip_sublist_rcv+0x3f8/0x530 [ 88.693781][ T0] ip_list_rcv+0x2f3/0x321 [ 88.698180][ T0] __netif_receive_skb_list_core+0x368/0x5c0 [ 88.704138][ T0] netif_receive_skb_list_internal+0x5c7/0x810 [ 88.710269][ T0] gro_normal_list.part.0+0x37/0xa0 [ 88.715450][ T0] gro_normal_one+0x14c/0x160 [ 88.720452][ T0] napi_gro_receive+0x27d/0x2f0 [ 88.725279][ T0] receive_buf+0x24e/0x2e20 [ 88.729776][ T0] virtnet_poll+0x343/0x790 [ 88.734257][ T0] net_rx_action+0x3ad/0xac0 [ 88.738826][ T0] __do_softirq+0x118/0x34a [ 88.743417][ T0] run_ksoftirqd+0x41/0x60 [ 88.747818][ T0] smpboot_thread_fn+0x374/0x4a0 [ 88.752824][ T0] kthread+0x1cb/0x1f0 [ 88.756922][ T0] ret_from_fork+0x1f/0x30 [ 88.763315][ T0] [ 88.765645][ T0] read to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 1: [ 88.773054][ T0] tick_nohz_next_event+0x192/0x350 [ 88.778254][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 88.783825][ T0] do_idle+0x1ad/0x290 [ 88.787913][ T0] cpu_startup_entry+0x14/0x20 [ 88.792939][ T0] start_secondary+0x164/0x1b0 [ 88.797974][ T0] secondary_startup_64+0xa4/0xb0 [ 88.803003][ T0] [ 88.805322][ T0] Reported by Kernel Concurrency Sanitizer on: [ 88.812422][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 88.820297][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.830330][ T0] ================================================================== [ 88.838375][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 88.844954][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 88.852824][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 88.862866][ T0] Call Trace: [ 88.866160][ T0] dump_stack+0x11d/0x187 [ 88.870476][ T0] panic+0x210/0x640 [ 88.874365][ T0] ? vprintk_func+0x89/0x13a [ 88.878942][ T0] kcsan_report.cold+0xc/0x14 [ 88.883617][ T0] kcsan_setup_watchpoint+0x304/0x400 [ 88.888974][ T0] tick_nohz_next_event+0x192/0x350 [ 88.894156][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 88.899681][ T0] ? ktime_get+0x1c9/0x210 [ 88.904078][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 88.909530][ T0] do_idle+0x1ad/0x290 [ 88.913577][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 88.919017][ T0] cpu_startup_entry+0x14/0x20 [ 88.923779][ T0] start_secondary+0x164/0x1b0 [ 88.928589][ T0] secondary_startup_64+0xa4/0xb0 [ 88.935114][ T0] Kernel Offset: disabled [ 88.939456][ T0] Rebooting in 86400 seconds..