[info] Using makefile-style concurrent boot in runlevel 2. [ 47.440335][ T27] audit: type=1800 audit(1578592453.444:21): pid=7814 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 47.498634][ T27] audit: type=1800 audit(1578592453.444:22): pid=7814 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 '10.128.0.72' (ECDSA) to the list of known hosts. 2020/01/09 17:54:26 fuzzer started 2020/01/09 17:54:28 dialing manager at 10.128.0.105:46059 2020/01/09 17:54:28 syscalls: 2812 2020/01/09 17:54:28 code coverage: enabled 2020/01/09 17:54:28 comparison tracing: enabled 2020/01/09 17:54:28 extra coverage: enabled 2020/01/09 17:54:28 setuid sandbox: enabled 2020/01/09 17:54:28 namespace sandbox: enabled 2020/01/09 17:54:28 Android sandbox: /sys/fs/selinux/policy does not exist 2020/01/09 17:54:28 fault injection: enabled 2020/01/09 17:54:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/01/09 17:54:28 net packet injection: enabled 2020/01/09 17:54:28 net device setup: enabled 2020/01/09 17:54:28 concurrency sanitizer: enabled 2020/01/09 17:54:28 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 63.817581][ T7982] KCSAN: could not find function: 'poll_schedule_timeout' 2020/01/09 17:54:37 adding functions to KCSAN blacklist: 'ext4_free_inode' 'blk_mq_dispatch_rq_list' 'do_exit' 'ext4_mb_good_group' 'taskstats_exit' 'ext4_has_free_clusters' 'poll_schedule_timeout' 'wbt_done' 'ext4_free_inodes_count' 'process_srcu' 'pid_update_inode' 'vm_area_dup' '__lru_cache_add' 'file_update_time' 'futex_wait_queue_me' 'run_timer_softirq' 'generic_write_end' 'blk_mq_run_hw_queue' 'echo_char' 'generic_fillattr' 'pcpu_alloc' 'tick_sched_do_timer' 'find_next_bit' 'copy_process' '__d_lookup_done' 'do_nanosleep' 'audit_log_start' '__snd_rawmidi_transmit_ack' 'virtqueue_disable_cb' 'fasync_remove_entry' 'lookup_fast' 'timer_clear_idle' 'ktime_get_real_seconds' 'blk_mq_get_request' 'blk_mq_sched_dispatch_requests' 'kauditd_thread' 'xas_find_marked' 'ep_poll' '__send_signal' 'tick_do_update_jiffies64' 'rcu_gp_fqs_check_wake' 'snd_seq_check_queue' '__hrtimer_run_queues' 'blk_stat_add' 'sit_tunnel_xmit' 'do_signal_stop' 'find_get_pages_range_tag' 'can_receive' 'ext4_nonda_switch' 'dd_has_work' 'tomoyo_supervisor' '__ext4_new_inode' 'page_counter_charge' 'tick_nohz_idle_stop_tick' 'iput' 'page_counter_try_charge' 'alloc_empty_file' 'xas_clear_mark' 'rcu_gp_fqs_loop' 'mod_timer' '__mark_inode_dirty' 'common_perm_cond' 'clear_inode' [ 167.804574][ T7972] ================================================================== [ 167.812741][ T7972] BUG: KCSAN: data-race in handle_mm_fault / watchdog [ 167.819475][ T7972] [ 167.821787][ T7972] read to 0xffff88812aedc050 of 8 bytes by task 1063 on cpu 0: [ 167.829312][ T7972] watchdog+0x2b1/0x960 [ 167.833445][ T7972] kthread+0x1d4/0x200 [ 167.837498][ T7972] ret_from_fork+0x1f/0x30 [ 167.841886][ T7972] [ 167.844196][ T7972] write to 0xffff88812aedc050 of 8 bytes by task 7972 on cpu 1: [ 167.851850][ T7972] handle_mm_fault+0x4a/0x530 [ 167.856508][ T7972] __do_page_fault+0x456/0x8d0 [ 167.861290][ T7972] do_page_fault+0x38/0x194 [ 167.865775][ T7972] page_fault+0x34/0x40 [ 167.869948][ T7972] [ 167.872254][ T7972] Reported by Kernel Concurrency Sanitizer on: [ 167.878426][ T7972] CPU: 1 PID: 7972 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 167.886638][ T7972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 167.896669][ T7972] ================================================================== [ 167.904707][ T7972] Kernel panic - not syncing: panic_on_warn set ... [ 167.911276][ T7972] CPU: 1 PID: 7972 Comm: syz-fuzzer Not tainted 5.5.0-rc1-syzkaller #0 [ 167.919505][ T7972] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 167.929642][ T7972] Call Trace: [ 167.932925][ T7972] dump_stack+0x11d/0x181 [ 167.937236][ T7972] panic+0x210/0x640 [ 167.941113][ T7972] ? vprintk_func+0x8d/0x140 [ 167.945684][ T7972] kcsan_report.cold+0xc/0xd [ 167.950255][ T7972] kcsan_setup_watchpoint+0x3fe/0x460 [ 167.955607][ T7972] __tsan_unaligned_write8+0xc7/0x110 [ 167.960958][ T7972] handle_mm_fault+0x4a/0x530 [ 167.965620][ T7972] __do_page_fault+0x456/0x8d0 [ 167.970367][ T7972] do_page_fault+0x38/0x194 [ 167.974854][ T7972] page_fault+0x34/0x40 [ 167.978985][ T7972] RIP: 0033:0x45a2a3 [ 167.982863][ T7972] Code: 00 48 81 eb 00 01 00 00 48 81 c7 00 01 00 00 48 81 fb 00 01 00 00 73 82 e9 07 ff ff ff c5 fd ef c0 48 81 fb 00 00 00 02 73 46 fe 7f 07 c5 fe 7f 47 20 c5 fe 7f 47 40 c5 fe 7f 47 60 48 81 eb [ 168.002446][ T7972] RSP: 002b:000000c420051e98 EFLAGS: 00010287 [ 168.008505][ T7972] RAX: 0000000000000000 RBX: 0000000000002000 RCX: 0000000000002000 [ 168.016457][ T7972] RDX: 0000000000000000 RSI: 0000000000000001 RDI: 000000c42b7ec000 [ 168.024416][ T7972] RBP: 000000c420051ee0 R08: 000000c000000000 R09: 0000000000005bf6 [ 168.032371][ T7972] R10: 00007fb35cb7a1e0 R11: 3fffffffffffffff R12: 0000000000000000 [ 168.040320][ T7972] R13: 0000000000000002 R14: 0000000000000002 R15: 0000000000000002 [ 168.049618][ T7972] Kernel Offset: disabled [ 168.053948][ T7972] Rebooting in 86400 seconds..