[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.437568][ T26] audit: type=1800 audit(1572470409.101:25): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.464649][ T26] audit: type=1800 audit(1572470409.101:26): pid=7060 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.491524][ T26] audit: type=1800 audit(1572470409.101:27): pid=7060 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 '10.128.0.213' (ECDSA) to the list of known hosts. 2019/10/30 21:20:19 fuzzer started 2019/10/30 21:20:21 dialing manager at 10.128.0.105:37477 2019/10/30 21:20:23 syscalls: 2540 2019/10/30 21:20:23 code coverage: enabled 2019/10/30 21:20:23 comparison tracing: enabled 2019/10/30 21:20:23 extra coverage: extra coverage is not supported by the kernel 2019/10/30 21:20:23 setuid sandbox: enabled 2019/10/30 21:20:23 namespace sandbox: enabled 2019/10/30 21:20:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/30 21:20:23 fault injection: enabled 2019/10/30 21:20:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/30 21:20:23 net packet injection: enabled 2019/10/30 21:20:23 net device setup: enabled 2019/10/30 21:20:23 concurrency sanitizer: enabled 2019/10/30 21:20:31 adding functions to KCSAN blacklist: '__nf_conntrack_find_get' '__ext4_new_inode' 'rcu_gp_fqs_check_wake' 'tcp_add_backlog' '__nf_ct_refresh_acct' 'taskstats_exit' 'inode_permission' 'pipe_poll' 'timer_clear_idle' '__splice_from_pipe' 'do_nanosleep' 'tcp_poll' 'xas_clear_mark' 'p9_poll_workfn' 'blk_mq_dispatch_rq_list' '__hrtimer_run_queues' 'task_dump_owner' 'futex_wait_queue_me' 'pid_update_inode' 'blk_mq_sched_dispatch_requests' 'ext4_has_free_clusters' 'mod_timer' 'shmem_file_read_iter' 'update_defense_level' '__d_lookup_done' 'generic_fillattr' 'ext4_free_inode' 'tick_sched_do_timer' 'ktime_get_real_seconds' 'generic_permission' 'dd_has_work' 'run_timer_softirq' 'generic_write_end' 'echo_char' 'tomoyo_supervisor' 'tick_do_update_jiffies64' 'tick_nohz_idle_stop_tick' 'ep_poll' 'add_timer' '__tcp_select_window' 'find_next_bit' syzkaller login: [ 77.247442][ T7221] ================================================================== [ 77.255575][ T7221] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 77.263451][ T7221] [ 77.265779][ T7221] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 77.273582][ T7221] timekeeping_advance+0x893/0xd80 [ 77.278687][ T7221] update_wall_time+0x19/0x20 [ 77.283365][ T7221] tick_do_update_jiffies64+0x1ae/0x260 [ 77.288913][ T7221] tick_sched_do_timer+0xd4/0xe0 [ 77.293844][ T7221] tick_sched_timer+0x43/0xe0 [ 77.298517][ T7221] __hrtimer_run_queues+0x288/0x600 [ 77.303709][ T7221] hrtimer_interrupt+0x22a/0x480 [ 77.308773][ T7221] smp_apic_timer_interrupt+0xdc/0x280 [ 77.314248][ T7221] apic_timer_interrupt+0xf/0x20 [ 77.319213][ T7221] __tsan_read4+0x0/0x30 [ 77.323436][ T7221] nf_conntrack_in+0x247/0xa80 [ 77.328177][ T7221] ipv4_conntrack_in+0x27/0x40 [ 77.332917][ T7221] nf_hook_slow+0x83/0x160 [ 77.337309][ T7221] ip_rcv+0x12f/0x1a0 [ 77.341275][ T7221] [ 77.343586][ T7221] read to 0xffffffff86040b80 of 8 bytes by task 7221 on cpu 1: [ 77.351204][ T7221] ktime_get_seconds+0x45/0x70 [ 77.355949][ T7221] tcp_rcv_established+0xeeb/0xf50 [ 77.361037][ T7221] tcp_v4_do_rcv+0x381/0x4e0 [ 77.365606][ T7221] __release_sock+0x135/0x1e0 [ 77.370260][ T7221] release_sock+0x61/0x160 [ 77.374756][ T7221] tcp_recvmsg+0x63b/0x1a30 [ 77.379342][ T7221] inet_recvmsg+0xbb/0x250 [ 77.383772][ T7221] sock_recvmsg+0x92/0xb0 [ 77.388080][ T7221] sock_read_iter+0x15f/0x1e0 [ 77.392735][ T7221] new_sync_read+0x389/0x4f0 [ 77.397299][ T7221] __vfs_read+0xb1/0xc0 [ 77.401443][ T7221] vfs_read+0x143/0x2c0 [ 77.405588][ T7221] ksys_read+0xd5/0x1b0 [ 77.409713][ T7221] [ 77.412037][ T7221] Reported by Kernel Concurrency Sanitizer on: [ 77.418261][ T7221] CPU: 1 PID: 7221 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 77.425689][ T7221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.435720][ T7221] ================================================================== [ 77.443861][ T7221] Kernel panic - not syncing: panic_on_warn set ... [ 77.450438][ T7221] CPU: 1 PID: 7221 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 77.457865][ T7221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 77.467896][ T7221] Call Trace: [ 77.471170][ T7221] dump_stack+0xf5/0x159 [ 77.475390][ T7221] panic+0x210/0x640 [ 77.479281][ T7221] ? sock_read_iter+0x15f/0x1e0 [ 77.484112][ T7221] ? vprintk_func+0x8d/0x140 [ 77.488685][ T7221] kcsan_report.cold+0xc/0x10 [ 77.493372][ T7221] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 77.498914][ T7221] __tsan_read8+0x2c/0x30 [ 77.503232][ T7221] ktime_get_seconds+0x45/0x70 [ 77.507986][ T7221] tcp_rcv_established+0xeeb/0xf50 [ 77.513082][ T7221] ? ipv4_dst_check+0xc6/0xf0 [ 77.517739][ T7221] tcp_v4_do_rcv+0x381/0x4e0 [ 77.522310][ T7221] __release_sock+0x135/0x1e0 [ 77.526983][ T7221] release_sock+0x61/0x160 [ 77.532173][ T7221] tcp_recvmsg+0x63b/0x1a30 [ 77.536666][ T7221] inet_recvmsg+0xbb/0x250 [ 77.541073][ T7221] ? __tsan_read8+0x2c/0x30 [ 77.545568][ T7221] ? inet_sendpage+0x100/0x100 [ 77.550585][ T7221] sock_recvmsg+0x92/0xb0 [ 77.554907][ T7221] sock_read_iter+0x15f/0x1e0 [ 77.559595][ T7221] new_sync_read+0x389/0x4f0 [ 77.564180][ T7221] __vfs_read+0xb1/0xc0 [ 77.568327][ T7221] vfs_read+0x143/0x2c0 [ 77.572474][ T7221] ksys_read+0xd5/0x1b0 [ 77.576621][ T7221] __x64_sys_read+0x4c/0x60 [ 77.581115][ T7221] do_syscall_64+0xcc/0x370 [ 77.585612][ T7221] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 77.591504][ T7221] RIP: 0033:0x47c530 [ 77.595392][ T7221] 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 [ 77.615072][ T7221] RSP: 002b:000000c4204f57d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 77.623496][ T7221] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 77.631456][ T7221] RDX: 0000000000001000 RSI: 000000c4203d2000 RDI: 0000000000000003 [ 77.639426][ T7221] RBP: 000000c4204f5830 R08: 0000000000000000 R09: 0000000000000000 [ 77.647397][ T7221] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 77.655362][ T7221] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 77.664785][ T7221] Kernel Offset: disabled [ 77.669150][ T7221] Rebooting in 86400 seconds..