[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 41.056753][ T25] audit: type=1800 audit(1570980268.741:25): pid=7069 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 41.096882][ T25] audit: type=1800 audit(1570980268.751:26): pid=7069 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 41.131980][ T25] audit: type=1800 audit(1570980268.751:27): pid=7069 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 '10.128.1.57' (ECDSA) to the list of known hosts. 2019/10/13 15:24:40 fuzzer started 2019/10/13 15:24:42 dialing manager at 10.128.0.105:40973 2019/10/13 15:24:42 syscalls: 2523 2019/10/13 15:24:42 code coverage: enabled 2019/10/13 15:24:42 comparison tracing: enabled 2019/10/13 15:24:42 extra coverage: extra coverage is not supported by the kernel 2019/10/13 15:24:42 setuid sandbox: enabled 2019/10/13 15:24:42 namespace sandbox: enabled 2019/10/13 15:24:42 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 15:24:42 fault injection: enabled 2019/10/13 15:24:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 15:24:42 net packet injection: enabled 2019/10/13 15:24:42 net device setup: enabled 2019/10/13 15:24:42 concurrency sanitizer: enabled syzkaller login: [ 55.086993][ T7232] ================================================================== [ 55.095540][ T7232] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 55.103405][ T7232] [ 55.105716][ T7232] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 0: [ 55.113501][ T7232] timekeeping_advance+0x893/0xd80 [ 55.118598][ T7232] update_wall_time+0x19/0x20 [ 55.123264][ T7232] tick_do_update_jiffies64+0x1ae/0x260 [ 55.128790][ T7232] tick_sched_do_timer+0xd4/0xe0 [ 55.133705][ T7232] tick_sched_timer+0x43/0xe0 [ 55.138385][ T7232] __hrtimer_run_queues+0x288/0x600 [ 55.143611][ T7232] hrtimer_interrupt+0x22a/0x480 [ 55.148536][ T7232] smp_apic_timer_interrupt+0xdc/0x280 [ 55.153976][ T7232] apic_timer_interrupt+0xf/0x20 [ 55.158895][ T7232] page_to_skb+0x9e/0x480 [ 55.163207][ T7232] receive_buf+0x17c7/0x30b0 [ 55.167792][ T7232] virtnet_poll+0x436/0x7d0 [ 55.172271][ T7232] net_rx_action+0x3ae/0xa50 [ 55.176888][ T7232] __do_softirq+0x115/0x33f [ 55.181367][ T7232] [ 55.183697][ T7232] read to 0xffffffff8603db80 of 8 bytes by task 7232 on cpu 1: [ 55.191216][ T7232] ktime_get_seconds+0x49/0x60 [ 55.195955][ T7232] tcp_rcv_established+0xeeb/0xf50 [ 55.201045][ T7232] tcp_v4_do_rcv+0x381/0x4e0 [ 55.205612][ T7232] __release_sock+0x135/0x1e0 [ 55.210272][ T7232] release_sock+0x61/0x160 [ 55.214664][ T7232] tcp_recvmsg+0x63b/0x1a30 [ 55.219146][ T7232] inet_recvmsg+0xbb/0x250 [ 55.223541][ T7232] sock_recvmsg+0x92/0xb0 [ 55.227847][ T7232] sock_read_iter+0x15f/0x1e0 [ 55.232502][ T7232] new_sync_read+0x389/0x4f0 [ 55.237067][ T7232] __vfs_read+0xb1/0xc0 [ 55.241198][ T7232] vfs_read+0x143/0x2c0 [ 55.245327][ T7232] ksys_read+0xd5/0x1b0 [ 55.249465][ T7232] [ 55.251781][ T7232] Reported by Kernel Concurrency Sanitizer on: [ 55.258002][ T7232] CPU: 1 PID: 7232 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.265080][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.275117][ T7232] ================================================================== [ 55.283160][ T7232] Kernel panic - not syncing: panic_on_warn set ... [ 55.289747][ T7232] CPU: 1 PID: 7232 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.296835][ T7232] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.306871][ T7232] Call Trace: [ 55.310182][ T7232] dump_stack+0xf5/0x159 [ 55.314411][ T7232] panic+0x209/0x639 [ 55.318287][ T7232] ? sock_read_iter+0x15f/0x1e0 [ 55.323167][ T7232] ? vprintk_func+0x8d/0x140 [ 55.327740][ T7232] kcsan_report.cold+0xc/0x1b [ 55.332395][ T7232] __kcsan_setup_watchpoint+0x3ee/0x510 [ 55.337921][ T7232] __tsan_read8+0x2c/0x30 [ 55.342227][ T7232] ktime_get_seconds+0x49/0x60 [ 55.346969][ T7232] tcp_rcv_established+0xeeb/0xf50 [ 55.352060][ T7232] ? ipv4_dst_check+0xc6/0xf0 [ 55.356714][ T7232] tcp_v4_do_rcv+0x381/0x4e0 [ 55.361287][ T7232] __release_sock+0x135/0x1e0 [ 55.365946][ T7232] release_sock+0x61/0x160 [ 55.370342][ T7232] tcp_recvmsg+0x63b/0x1a30 [ 55.374831][ T7232] inet_recvmsg+0xbb/0x250 [ 55.379246][ T7232] ? __tsan_read8+0x2c/0x30 [ 55.383727][ T7232] ? inet_sendpage+0x100/0x100 [ 55.388469][ T7232] sock_recvmsg+0x92/0xb0 [ 55.392786][ T7232] sock_read_iter+0x15f/0x1e0 [ 55.397477][ T7232] new_sync_read+0x389/0x4f0 [ 55.402060][ T7232] __vfs_read+0xb1/0xc0 [ 55.406193][ T7232] vfs_read+0x143/0x2c0 [ 55.410345][ T7232] ksys_read+0xd5/0x1b0 [ 55.414484][ T7232] __x64_sys_read+0x4c/0x60 [ 55.418969][ T7232] do_syscall_64+0xcf/0x2f0 [ 55.423474][ T7232] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.429350][ T7232] RIP: 0033:0x47c530 [ 55.433239][ T7232] 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 [ 55.452820][ T7232] RSP: 002b:000000c4202fd7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 55.461209][ T7232] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 55.469330][ T7232] RDX: 0000000000001000 RSI: 000000c420054000 RDI: 0000000000000003 [ 55.477281][ T7232] RBP: 000000c4202fd830 R08: 0000000000000000 R09: 0000000000000000 [ 55.485233][ T7232] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000004 [ 55.493193][ T7232] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 55.502659][ T7232] Kernel Offset: disabled [ 55.506996][ T7232] Rebooting in 86400 seconds..