[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.606668][ T26] audit: type=1800 audit(1572280988.888:25): pid=7070 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.639270][ T26] audit: type=1800 audit(1572280988.888:26): pid=7070 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.664273][ T26] audit: type=1800 audit(1572280988.888:27): pid=7070 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 '10.128.10.33' (ECDSA) to the list of known hosts. 2019/10/28 16:43:21 fuzzer started 2019/10/28 16:43:23 dialing manager at 10.128.0.105:45117 2019/10/28 16:43:25 syscalls: 2540 2019/10/28 16:43:25 code coverage: enabled 2019/10/28 16:43:25 comparison tracing: enabled 2019/10/28 16:43:25 extra coverage: extra coverage is not supported by the kernel 2019/10/28 16:43:25 setuid sandbox: enabled 2019/10/28 16:43:25 namespace sandbox: enabled 2019/10/28 16:43:25 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/28 16:43:25 fault injection: enabled 2019/10/28 16:43:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/28 16:43:25 net packet injection: enabled 2019/10/28 16:43:25 net device setup: enabled 2019/10/28 16:43:25 concurrency sanitizer: enabled syzkaller login: [ 53.231328][ T7234] KCSAN: could not find function: 'poll_schedule_timeout' 2019/10/28 16:43:34 adding functions to KCSAN blacklist: '__nf_ct_refresh_acct' 'find_next_bit' 'tick_sched_do_timer' 'ext4_nonda_switch' 'd_shrink_add' '__snd_rawmidi_transmit_ack' 'poll_schedule_timeout' 'blk_mq_get_request' 'rcu_gp_fqs_loop' '__tcp_select_window' 'echo_char' 'task_dump_owner' 'do_nanosleep' 'tcp_poll' 'generic_write_end' 'find_get_pages_range_tag' 'blk_mq_sched_dispatch_requests' '__nf_conntrack_find_get' 'tomoyo_supervisor' 'wbt_wait' 'mm_update_next_owner' 'tcp_add_backlog' 'run_timer_softirq' 'mod_timer' 'generic_permission' 'vm_area_dup' 'futex_wait_queue_me' 'taskstats_exit' 'update_defense_level' '__hrtimer_run_queues' 'ep_poll' 'ktime_get_real_seconds' 'ext4_free_inode' 'ext4_free_inodes_count' '__splice_from_pipe' 'tick_nohz_idle_stop_tick' 'pid_update_inode' 'do_syslog' 'pipe_poll' 'vti_tunnel_xmit' 'enqueue_timer' 'rcu_gp_fqs_check_wake' 'tick_do_update_jiffies64' '__ext4_new_inode' 'do_exit' [ 68.488965][ T7222] ================================================================== [ 68.497103][ T7222] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 68.504978][ T7222] [ 68.507303][ T7222] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 68.515100][ T7222] timekeeping_advance+0x893/0xd80 [ 68.520208][ T7222] update_wall_time+0x19/0x20 [ 68.524985][ T7222] tick_do_update_jiffies64+0x1ae/0x260 [ 68.530697][ T7222] tick_sched_do_timer+0xd4/0xe0 [ 68.535680][ T7222] tick_sched_timer+0x43/0xe0 [ 68.540339][ T7222] __hrtimer_run_queues+0x288/0x600 [ 68.545640][ T7222] hrtimer_interrupt+0x22a/0x480 [ 68.550564][ T7222] smp_apic_timer_interrupt+0xdc/0x280 [ 68.556005][ T7222] apic_timer_interrupt+0xf/0x20 [ 68.560923][ T7222] __tsan_read8+0x1/0x30 [ 68.565147][ T7222] nf_hook_slow+0x83/0x160 [ 68.569561][ T7222] ip_rcv+0x12f/0x1a0 [ 68.573638][ T7222] __netif_receive_skb_one_core+0xa7/0xe0 [ 68.579357][ T7222] __netif_receive_skb+0x37/0xf0 [ 68.584271][ T7222] [ 68.586581][ T7222] read to 0xffffffff86040b80 of 8 bytes by task 7222 on cpu 0: [ 68.594102][ T7222] ktime_get_seconds+0x45/0x70 [ 68.598842][ T7222] tcp_rcv_established+0xeeb/0xf50 [ 68.603979][ T7222] tcp_v4_do_rcv+0x381/0x4e0 [ 68.608681][ T7222] __release_sock+0x135/0x1e0 [ 68.613385][ T7222] release_sock+0x61/0x160 [ 68.617788][ T7222] tcp_recvmsg+0x63b/0x1a30 [ 68.622404][ T7222] inet_recvmsg+0xbb/0x250 [ 68.626850][ T7222] sock_recvmsg+0x92/0xb0 [ 68.631177][ T7222] sock_read_iter+0x15f/0x1e0 [ 68.635832][ T7222] new_sync_read+0x389/0x4f0 [ 68.640402][ T7222] __vfs_read+0xb1/0xc0 [ 68.644543][ T7222] vfs_read+0x143/0x2c0 [ 68.648678][ T7222] ksys_read+0xd5/0x1b0 [ 68.652818][ T7222] [ 68.655120][ T7222] Reported by Kernel Concurrency Sanitizer on: [ 68.661263][ T7222] CPU: 0 PID: 7222 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 68.668694][ T7222] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.678722][ T7222] ================================================================== [ 68.686759][ T7222] Kernel panic - not syncing: panic_on_warn set ... [ 68.693319][ T7222] CPU: 0 PID: 7222 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 68.700762][ T7222] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 68.710916][ T7222] Call Trace: [ 68.714194][ T7222] dump_stack+0xf5/0x159 [ 68.718412][ T7222] panic+0x210/0x640 [ 68.722298][ T7222] ? sock_read_iter+0x15f/0x1e0 [ 68.727124][ T7222] ? vprintk_func+0x8d/0x140 [ 68.731694][ T7222] kcsan_report.cold+0xc/0x10 [ 68.736350][ T7222] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 68.741871][ T7222] __tsan_read8+0x2c/0x30 [ 68.746176][ T7222] ktime_get_seconds+0x45/0x70 [ 68.750930][ T7222] tcp_rcv_established+0xeeb/0xf50 [ 68.756021][ T7222] ? ipv4_dst_check+0xc6/0xf0 [ 68.760677][ T7222] tcp_v4_do_rcv+0x381/0x4e0 [ 68.765258][ T7222] __release_sock+0x135/0x1e0 [ 68.769921][ T7222] release_sock+0x61/0x160 [ 68.774318][ T7222] tcp_recvmsg+0x63b/0x1a30 [ 68.778809][ T7222] inet_recvmsg+0xbb/0x250 [ 68.783201][ T7222] ? __tsan_read8+0x2c/0x30 [ 68.787679][ T7222] ? inet_sendpage+0x100/0x100 [ 68.792422][ T7222] sock_recvmsg+0x92/0xb0 [ 68.796731][ T7222] sock_read_iter+0x15f/0x1e0 [ 68.801388][ T7222] new_sync_read+0x389/0x4f0 [ 68.805973][ T7222] __vfs_read+0xb1/0xc0 [ 68.810130][ T7222] vfs_read+0x143/0x2c0 [ 68.814269][ T7222] ksys_read+0xd5/0x1b0 [ 68.818402][ T7222] __x64_sys_read+0x4c/0x60 [ 68.822884][ T7222] do_syscall_64+0xcc/0x370 [ 68.827375][ T7222] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 68.833245][ T7222] RIP: 0033:0x47c530 [ 68.837122][ T7222] 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 [ 68.856701][ T7222] RSP: 002b:000000c420325810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 68.866920][ T7222] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 68.874867][ T7222] RDX: 0000000000001000 RSI: 000000c4200ac000 RDI: 0000000000000003 [ 68.882814][ T7222] RBP: 000000c420325868 R08: 0000000000000000 R09: 0000000000000000 [ 68.890771][ T7222] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 68.898729][ T7222] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 68.908062][ T7222] Kernel Offset: disabled [ 68.912383][ T7222] Rebooting in 86400 seconds..