[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 33.744158][ T26] audit: type=1800 audit(1572324118.499:25): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 33.790849][ T26] audit: type=1800 audit(1572324118.499:26): pid=7079 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 33.812200][ T26] audit: type=1800 audit(1572324118.499:27): pid=7079 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 '10.128.15.196' (ECDSA) to the list of known hosts. 2019/10/29 04:42:07 fuzzer started 2019/10/29 04:42:08 dialing manager at 10.128.0.105:40771 2019/10/29 04:42:10 syscalls: 2540 2019/10/29 04:42:10 code coverage: enabled 2019/10/29 04:42:10 comparison tracing: enabled 2019/10/29 04:42:10 extra coverage: extra coverage is not supported by the kernel 2019/10/29 04:42:10 setuid sandbox: enabled 2019/10/29 04:42:10 namespace sandbox: enabled 2019/10/29 04:42:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/29 04:42:10 fault injection: enabled 2019/10/29 04:42:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/29 04:42:10 net packet injection: enabled 2019/10/29 04:42:10 net device setup: enabled 2019/10/29 04:42:10 concurrency sanitizer: enabled syzkaller login: [ 46.971971][ T7247] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/29 04:42:20 adding functions to KCSAN blacklist: '__ext4_new_inode' 'dccp_rcv_reset' 'taskstats_exit' 'poll_schedule_timeout' 'rcu_gp_fqs_check_wake' 'bio_endio' 'generic_permission' 'tomoyo_supervisor' 'alloc_pid' 'vm_area_dup' 'update_defense_level' 'exit_signals' 'do_exit' 'tcp_add_backlog' 'page_counter_try_charge' 'ep_poll' 'tcp_poll' 'blk_mq_sched_dispatch_requests' 'task_dump_owner' '__nf_ct_refresh_acct' 'mod_timer' 'wbt_done' 'pcpu_alloc' 'tick_sched_do_timer' 'ext4_has_free_clusters' 'blk_mq_dispatch_rq_list' 'ktime_get_real_seconds' 'find_next_bit' 'queue_access_lock' 'generic_write_end' 'dd_has_work' 'tick_do_update_jiffies64' 'pipe_poll' 'p9_poll_workfn' 'find_group_orlov' 'do_nanosleep' '__hrtimer_run_queues' 'pid_update_inode' 'pipe_wait' 'xas_find_marked' 'find_get_pages_range_tag' '__nf_conntrack_find_get' 'tick_nohz_idle_stop_tick' 'run_timer_softirq' 'add_timer' 'ext4_free_inodes_count' [ 73.204438][ T7237] ================================================================== [ 73.212571][ T7237] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 73.220444][ T7237] [ 73.222773][ T7237] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 73.230573][ T7237] timekeeping_advance+0x893/0xd80 [ 73.235683][ T7237] update_wall_time+0x19/0x20 [ 73.240354][ T7237] tick_do_update_jiffies64+0x1ae/0x260 [ 73.245896][ T7237] tick_sched_do_timer+0xd4/0xe0 [ 73.252049][ T7237] tick_sched_timer+0x43/0xe0 [ 73.256725][ T7237] __hrtimer_run_queues+0x288/0x600 [ 73.261920][ T7237] hrtimer_interrupt+0x22a/0x480 [ 73.266851][ T7237] smp_apic_timer_interrupt+0xdc/0x280 [ 73.272304][ T7237] apic_timer_interrupt+0xf/0x20 [ 73.277239][ T7237] __sanitizer_cov_trace_const_cmp4+0x1/0x20 [ 73.283216][ T7237] nf_conntrack_in+0x410/0xa80 [ 73.287971][ T7237] ipv4_conntrack_in+0x27/0x40 [ 73.292731][ T7237] nf_hook_slow+0x83/0x160 [ 73.297139][ T7237] ip_rcv+0x12f/0x1a0 [ 73.301103][ T7237] [ 73.303428][ T7237] read to 0xffffffff86040b80 of 8 bytes by task 7237 on cpu 0: [ 73.310961][ T7237] ktime_get_seconds+0x45/0x70 [ 73.315703][ T7237] tcp_rcv_established+0xeeb/0xf50 [ 73.320791][ T7237] tcp_v4_do_rcv+0x381/0x4e0 [ 73.325359][ T7237] __release_sock+0x135/0x1e0 [ 73.330007][ T7237] release_sock+0x61/0x160 [ 73.334399][ T7237] tcp_recvmsg+0x63b/0x1a30 [ 73.338877][ T7237] inet_recvmsg+0xbb/0x250 [ 73.343274][ T7237] sock_recvmsg+0x92/0xb0 [ 73.347582][ T7237] sock_read_iter+0x15f/0x1e0 [ 73.352237][ T7237] new_sync_read+0x389/0x4f0 [ 73.356805][ T7237] __vfs_read+0xb1/0xc0 [ 73.360935][ T7237] vfs_read+0x143/0x2c0 [ 73.365064][ T7237] ksys_read+0xd5/0x1b0 [ 73.369191][ T7237] [ 73.371492][ T7237] Reported by Kernel Concurrency Sanitizer on: [ 73.377671][ T7237] CPU: 0 PID: 7237 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 73.385099][ T7237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.395130][ T7237] ================================================================== [ 73.403170][ T7237] Kernel panic - not syncing: panic_on_warn set ... [ 73.409748][ T7237] CPU: 0 PID: 7237 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 73.417192][ T7237] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 73.427230][ T7237] Call Trace: [ 73.430531][ T7237] dump_stack+0xf5/0x159 [ 73.434755][ T7237] panic+0x210/0x640 [ 73.438630][ T7237] ? sock_read_iter+0x15f/0x1e0 [ 73.443458][ T7237] ? vprintk_func+0x8d/0x140 [ 73.448037][ T7237] kcsan_report.cold+0xc/0x10 [ 73.452706][ T7237] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 73.458229][ T7237] __tsan_read8+0x2c/0x30 [ 73.462537][ T7237] ktime_get_seconds+0x45/0x70 [ 73.467294][ T7237] tcp_rcv_established+0xeeb/0xf50 [ 73.472410][ T7237] ? ipv4_dst_check+0xc6/0xf0 [ 73.477067][ T7237] tcp_v4_do_rcv+0x381/0x4e0 [ 73.481636][ T7237] __release_sock+0x135/0x1e0 [ 73.486292][ T7237] release_sock+0x61/0x160 [ 73.490699][ T7237] tcp_recvmsg+0x63b/0x1a30 [ 73.495187][ T7237] inet_recvmsg+0xbb/0x250 [ 73.499580][ T7237] ? __tsan_read8+0x2c/0x30 [ 73.504077][ T7237] ? inet_sendpage+0x100/0x100 [ 73.508829][ T7237] sock_recvmsg+0x92/0xb0 [ 73.513147][ T7237] sock_read_iter+0x15f/0x1e0 [ 73.517806][ T7237] new_sync_read+0x389/0x4f0 [ 73.522377][ T7237] __vfs_read+0xb1/0xc0 [ 73.526511][ T7237] vfs_read+0x143/0x2c0 [ 73.530657][ T7237] ksys_read+0xd5/0x1b0 [ 73.534790][ T7237] __x64_sys_read+0x4c/0x60 [ 73.539288][ T7237] do_syscall_64+0xcc/0x370 [ 73.543790][ T7237] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 73.549658][ T7237] RIP: 0033:0x47c530 [ 73.553546][ T7237] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 73.573143][ T7237] RSP: 002b:000000c42030b7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 73.581558][ T7237] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 73.589539][ T7237] RDX: 0000000000001000 RSI: 000000c420152000 RDI: 0000000000000003 [ 73.597487][ T7237] RBP: 000000c42030b830 R08: 0000000000000000 R09: 0000000000000000 [ 73.605445][ T7237] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 73.613393][ T7237] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 73.622842][ T7237] Kernel Offset: disabled [ 73.627161][ T7237] Rebooting in 86400 seconds..