[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.986437][ T25] audit: type=1800 audit(1571003551.751:25): pid=7008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.006087][ T25] audit: type=1800 audit(1571003551.751:26): pid=7008 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.032664][ T25] audit: type=1800 audit(1571003551.751:27): pid=7008 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 '10.128.0.83' (ECDSA) to the list of known hosts. 2019/10/13 21:52:43 fuzzer started 2019/10/13 21:52:44 dialing manager at 10.128.0.105:40973 2019/10/13 21:52:44 syscalls: 2523 2019/10/13 21:52:44 code coverage: enabled 2019/10/13 21:52:44 comparison tracing: enabled 2019/10/13 21:52:44 extra coverage: extra coverage is not supported by the kernel 2019/10/13 21:52:44 setuid sandbox: enabled 2019/10/13 21:52:44 namespace sandbox: enabled 2019/10/13 21:52:44 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 21:52:44 fault injection: enabled 2019/10/13 21:52:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 21:52:44 net packet injection: enabled 2019/10/13 21:52:44 net device setup: enabled 2019/10/13 21:52:44 concurrency sanitizer: enabled syzkaller login: [ 48.072633][ T7162] ================================================================== [ 48.080776][ T7162] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 48.088672][ T7162] [ 48.091103][ T7162] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 0: [ 48.098907][ T7162] timekeeping_advance+0x893/0xd80 [ 48.104101][ T7162] update_wall_time+0x19/0x20 [ 48.108858][ T7162] tick_do_update_jiffies64+0x1ae/0x260 [ 48.114412][ T7162] tick_sched_do_timer+0xd4/0xe0 [ 48.119326][ T7162] tick_sched_timer+0x43/0xe0 [ 48.123992][ T7162] __hrtimer_run_queues+0x288/0x600 [ 48.129185][ T7162] hrtimer_interrupt+0x22a/0x480 [ 48.134291][ T7162] smp_apic_timer_interrupt+0xdc/0x280 [ 48.139727][ T7162] apic_timer_interrupt+0xf/0x20 [ 48.144654][ T7162] __sanitizer_cov_trace_switch+0x1/0x80 [ 48.150281][ T7162] nf_conntrack_tcp_packet+0x227e/0x3390 [ 48.155986][ T7162] nf_conntrack_in+0x410/0xaa0 [ 48.160726][ T7162] ipv4_conntrack_in+0x27/0x40 [ 48.165490][ T7162] nf_hook_slow+0x83/0x160 [ 48.169888][ T7162] [ 48.172210][ T7162] read to 0xffffffff8603db80 of 8 bytes by task 7162 on cpu 1: [ 48.179735][ T7162] ktime_get_seconds+0x49/0x60 [ 48.184512][ T7162] tcp_rcv_established+0xeeb/0xf50 [ 48.189601][ T7162] tcp_v4_do_rcv+0x381/0x4e0 [ 48.194189][ T7162] __release_sock+0x135/0x1e0 [ 48.198867][ T7162] release_sock+0x61/0x160 [ 48.203268][ T7162] tcp_recvmsg+0x63b/0x1a30 [ 48.207862][ T7162] inet_recvmsg+0xbb/0x250 [ 48.212272][ T7162] sock_recvmsg+0x92/0xb0 [ 48.216591][ T7162] sock_read_iter+0x15f/0x1e0 [ 48.221263][ T7162] new_sync_read+0x389/0x4f0 [ 48.225831][ T7162] __vfs_read+0xb1/0xc0 [ 48.229963][ T7162] vfs_read+0x143/0x2c0 [ 48.234095][ T7162] ksys_read+0xd5/0x1b0 [ 48.238233][ T7162] [ 48.240552][ T7162] Reported by Kernel Concurrency Sanitizer on: [ 48.246769][ T7162] CPU: 1 PID: 7162 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.253860][ T7162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.263904][ T7162] ================================================================== [ 48.271940][ T7162] Kernel panic - not syncing: panic_on_warn set ... [ 48.278514][ T7162] CPU: 1 PID: 7162 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.285606][ T7162] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.295644][ T7162] Call Trace: [ 48.298937][ T7162] dump_stack+0xf5/0x159 [ 48.303187][ T7162] panic+0x209/0x639 [ 48.307077][ T7162] ? sock_read_iter+0x15f/0x1e0 [ 48.311907][ T7162] ? vprintk_func+0x8d/0x140 [ 48.316592][ T7162] kcsan_report.cold+0xc/0x1b [ 48.321248][ T7162] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.326777][ T7162] __tsan_read8+0x2c/0x30 [ 48.331111][ T7162] ktime_get_seconds+0x49/0x60 [ 48.335855][ T7162] tcp_rcv_established+0xeeb/0xf50 [ 48.340958][ T7162] ? ipv4_dst_check+0xc6/0xf0 [ 48.345635][ T7162] tcp_v4_do_rcv+0x381/0x4e0 [ 48.350229][ T7162] __release_sock+0x135/0x1e0 [ 48.354885][ T7162] release_sock+0x61/0x160 [ 48.359294][ T7162] tcp_recvmsg+0x63b/0x1a30 [ 48.363800][ T7162] inet_recvmsg+0xbb/0x250 [ 48.368208][ T7162] ? __tsan_read8+0x2c/0x30 [ 48.372831][ T7162] ? inet_sendpage+0x100/0x100 [ 48.377581][ T7162] sock_recvmsg+0x92/0xb0 [ 48.381902][ T7162] sock_read_iter+0x15f/0x1e0 [ 48.386720][ T7162] new_sync_read+0x389/0x4f0 [ 48.391311][ T7162] __vfs_read+0xb1/0xc0 [ 48.395454][ T7162] vfs_read+0x143/0x2c0 [ 48.399612][ T7162] ksys_read+0xd5/0x1b0 [ 48.403760][ T7162] __x64_sys_read+0x4c/0x60 [ 48.408254][ T7162] do_syscall_64+0xcf/0x2f0 [ 48.412756][ T7162] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.418905][ T7162] RIP: 0033:0x47c530 [ 48.422795][ T7162] 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 [ 48.442405][ T7162] RSP: 002b:000000c4204fb818 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.450821][ T7162] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.458785][ T7162] RDX: 0000000000001000 RSI: 000000c4201be000 RDI: 0000000000000003 [ 48.466748][ T7162] RBP: 000000c4204fb870 R08: 0000000000000000 R09: 0000000000000000 [ 48.474799][ T7162] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 48.482765][ T7162] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 48.492139][ T7162] Kernel Offset: disabled [ 48.496494][ T7162] Rebooting in 86400 seconds..