[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.126368][ T25] audit: type=1800 audit(1571936277.263:25): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.153880][ T25] audit: type=1800 audit(1571936277.263:26): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.189511][ T25] audit: type=1800 audit(1571936277.273:27): pid=7107 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="restorecond" dev="sda1" ino=2469 res=0 [....] 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 '10.128.1.3' (ECDSA) to the list of known hosts. 2019/10/24 16:58:08 fuzzer started 2019/10/24 16:58:10 dialing manager at 10.128.0.105:42135 2019/10/24 16:58:10 syscalls: 2524 2019/10/24 16:58:10 code coverage: enabled 2019/10/24 16:58:10 comparison tracing: enabled 2019/10/24 16:58:10 extra coverage: extra coverage is not supported by the kernel 2019/10/24 16:58:10 setuid sandbox: enabled 2019/10/24 16:58:10 namespace sandbox: enabled 2019/10/24 16:58:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/24 16:58:10 fault injection: enabled 2019/10/24 16:58:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/24 16:58:10 net packet injection: enabled 2019/10/24 16:58:10 net device setup: enabled 2019/10/24 16:58:10 concurrency sanitizer: enabled syzkaller login: [ 54.495058][ T7272] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/24 16:58:32 adding functions to KCSAN blacklist: 'generic_fillattr' 'page_counter_try_charge' 'sbitmap_queue_clear' 'do_nanosleep' 'blk_mq_sched_dispatch_requests' 'dd_has_work' 'mm_update_next_owner' 'fsnotify' 'taskstats_exit' '__snd_rawmidi_transmit_ack' 'do_readlinkat' 'kvm_mmu_notifier_invalidate_range_end' 'dput' 'pid_update_inode' 'atime_needs_update' '__dev_queue_xmit' 'ipip_tunnel_xmit' 'exit_signals' 'snd_seq_check_queue' 'hrtimer_wakeup' 'rcu_gp_fqs_check_wake' 'mod_timer' 'shmem_getpage_gfp' 'kvm_arch_vcpu_load' '__neigh_event_send' 'kernfs_refresh_inode' 'task_dump_owner' 'poll_schedule_timeout' 'run_timer_softirq' 'add_timer_on' 'ktime_get_seconds' 'mem_cgroup_select_victim_node' 'ext4_has_free_clusters' 'snd_seq_timer_get_cur_tick' 'filemap_map_pages' 'tomoyo_supervisor' 'wbt_issue' 'blk_mq_get_request' 'find_next_bit' '__splice_from_pipe' '__skb_try_recv_from_queue' '__tcp_select_window' 'process_srcu' '__mark_inode_dirty' 'do_exit' 'p9_poll_workfn' 'wq_watchdog_reset_touched' 'ext4_nonda_switch' 'bio_endio' 'tick_nohz_idle_stop_tick' 'balance_dirty_pages' 'osq_lock' 'sit_tunnel_xmit' 'ext4_writepages' 'shmem_file_read_iter' 'ext4_mark_iloc_dirty' '__hrtimer_run_queues' '__alloc_file' 'iput' 'vm_area_dup' '__ext4_new_inode' 'padata_find_next' '__perf_event_overflow' 'kvm_write_tsc' '__writeback_single_inode' 'ktime_get_real_seconds' '__filemap_fdatawrite_range' 'vti_tunnel_xmit' 'tick_do_update_jiffies64' 'tcp_add_backlog' 'ext4_free_inode' 'update_defense_level' 'blk_mq_dispatch_rq_list' 'ep_poll' 'tcp_poll' 'find_get_pages_range_tag' 'lru_add_drain_all' 'wbc_detach_inode' 'tick_sched_do_timer' 'snapshot_refaults' 'get_task_cred' 'add_timer' 'xas_find_marked' 'generic_write_end' 'sk_wait_data' 'install_new_memslots' 'ext4_mb_good_group' 'timer_clear_idle' 'wbt_wait' 'rcu_gp_fqs_loop' 'list_lru_count_one' '__skb_wait_for_more_packets' 'copy_process' 'pipe_wait' 'blk_mq_run_hw_queue' 'udp6_lib_lookup2' 'pcpu_alloc' 'unix_release_sock' 'ext4_free_inodes_count' 'generic_permission' '__nf_ct_refresh_acct' 'ext4_da_write_end' 'icmp_global_allow' '__find_get_block' 'pipe_poll' 'l2tp_tunnel_del_work' 'do_syslog' 'd_delete' [ 265.639707][ T7255] ================================================================== [ 265.647855][ T7255] BUG: KCSAN: data-race in __acct_update_integrals / mmap_region [ 265.655565][ T7255] [ 265.657902][ T7255] read to 0xffff88812555f380 of 8 bytes by interrupt on cpu 0: [ 265.665474][ T7255] __acct_update_integrals+0x1b1/0x1e0 [ 265.670941][ T7255] acct_account_cputime+0x4e/0x60 [ 265.675976][ T7255] account_user_time+0xb2/0xc0 [ 265.680746][ T7255] irqtime_account_process_tick.isra.0+0x14e/0x1b0 [ 265.687251][ T7255] account_process_tick+0x14e/0x190 [ 265.692441][ T7255] update_process_times+0x29/0x80 [ 265.697505][ T7255] tick_sched_handle+0x75/0x100 [ 265.702346][ T7255] tick_sched_timer+0x58/0xe0 [ 265.707011][ T7255] __hrtimer_run_queues+0x288/0x600 [ 265.712203][ T7255] hrtimer_interrupt+0x22a/0x480 [ 265.717139][ T7255] smp_apic_timer_interrupt+0xdc/0x280 [ 265.722596][ T7255] apic_timer_interrupt+0xf/0x20 [ 265.727512][ T7255] [ 265.729831][ T7255] write to 0xffff88812555f380 of 8 bytes by task 7255 on cpu 1: [ 265.737448][ T7255] mmap_region+0x328/0xd50 [ 265.741871][ T7255] do_mmap+0x6d4/0xba0 [ 265.745977][ T7255] vm_mmap_pgoff+0x12d/0x190 [ 265.750558][ T7255] ksys_mmap_pgoff+0x99/0x420 [ 265.755226][ T7255] __x64_sys_mmap+0x91/0xc0 [ 265.759718][ T7255] do_syscall_64+0xcc/0x370 [ 265.764215][ T7255] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 265.770088][ T7255] [ 265.772418][ T7255] Reported by Kernel Concurrency Sanitizer on: [ 265.778559][ T7255] CPU: 1 PID: 7255 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 265.786100][ T7255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 265.796308][ T7255] ================================================================== [ 265.804353][ T7255] Kernel panic - not syncing: panic_on_warn set ... [ 265.810933][ T7255] CPU: 1 PID: 7255 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 265.818379][ T7255] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 265.828421][ T7255] Call Trace: [ 265.831705][ T7255] dump_stack+0xf5/0x159 [ 265.835947][ T7255] panic+0x210/0x640 [ 265.839835][ T7255] ? vprintk_func+0x8d/0x140 [ 265.844426][ T7255] kcsan_report.cold+0xc/0x10 [ 265.849094][ T7255] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 265.854629][ T7255] __tsan_write8+0x32/0x40 [ 265.859069][ T7255] mmap_region+0x328/0xd50 [ 265.863465][ T7255] ? __tsan_read8+0x2c/0x30 [ 265.867963][ T7255] do_mmap+0x6d4/0xba0 [ 265.872036][ T7255] vm_mmap_pgoff+0x12d/0x190 [ 265.876645][ T7255] ksys_mmap_pgoff+0x99/0x420 [ 265.881335][ T7255] __x64_sys_mmap+0x91/0xc0 [ 265.885869][ T7255] do_syscall_64+0xcc/0x370 [ 265.890375][ T7255] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 265.896251][ T7255] RIP: 0033:0x45b014 [ 265.900131][ T7255] Code: 03 cc cc cc cc cc 48 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 44 8b 44 24 20 44 8b 4c 24 24 b8 09 00 00 00 0f 05 <48> 3d 01 f0 ff ff 76 15 48 f7 d0 48 ff c0 48 c7 44 24 28 00 00 00 [ 265.920687][ T7255] RSP: 002b:00007ffca96c0c80 EFLAGS: 00000246 ORIG_RAX: 0000000000000009 [ 265.929095][ T7255] RAX: ffffffffffffffda RBX: 000000c42002d738 RCX: 000000000045b014 [ 265.937043][ T7255] RDX: 0000000000000003 RSI: 0000000000040000 RDI: 0000000000000000 [ 265.945005][ T7255] RBP: 00007ffca96c0cf0 R08: 00000000ffffffff R09: 0000000000000000 [ 265.952964][ T7255] R10: 0000000000000022 R11: 0000000000000246 R12: 0000000000000000 [ 265.960914][ T7255] R13: 0000000000000010 R14: 0000000000000010 R15: 0000000000000010 [ 265.970227][ T7255] Kernel Offset: disabled [ 265.974552][ T7255] Rebooting in 86400 seconds..