[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.302991][ T25] audit: type=1800 audit(1571579367.304:25): pid=6957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.339969][ T25] audit: type=1800 audit(1571579367.304:26): pid=6957 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.367034][ T25] audit: type=1800 audit(1571579367.304:27): pid=6957 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 '10.128.1.52' (ECDSA) to the list of known hosts. 2019/10/20 13:49:36 fuzzer started 2019/10/20 13:49:38 dialing manager at 10.128.0.105:43535 2019/10/20 13:49:38 syscalls: 2524 2019/10/20 13:49:38 code coverage: enabled 2019/10/20 13:49:38 comparison tracing: enabled 2019/10/20 13:49:38 extra coverage: extra coverage is not supported by the kernel 2019/10/20 13:49:38 setuid sandbox: enabled 2019/10/20 13:49:38 namespace sandbox: enabled 2019/10/20 13:49:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 13:49:38 fault injection: enabled 2019/10/20 13:49:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 13:49:38 net packet injection: enabled 2019/10/20 13:49:38 net device setup: enabled 2019/10/20 13:49:38 concurrency sanitizer: enabled syzkaller login: [ 45.189207][ T7111] ================================================================== [ 45.197332][ T7111] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 45.205194][ T7111] [ 45.207505][ T7111] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 0: [ 45.215322][ T7111] timekeeping_advance+0x893/0xd80 [ 45.220414][ T7111] update_wall_time+0x19/0x20 [ 45.225070][ T7111] tick_do_update_jiffies64+0x1ae/0x260 [ 45.230593][ T7111] tick_sched_do_timer+0xd4/0xe0 [ 45.235506][ T7111] tick_sched_timer+0x43/0xe0 [ 45.240168][ T7111] __hrtimer_run_queues+0x288/0x600 [ 45.245404][ T7111] hrtimer_interrupt+0x22a/0x480 [ 45.250322][ T7111] smp_apic_timer_interrupt+0xdc/0x280 [ 45.255762][ T7111] apic_timer_interrupt+0xf/0x20 [ 45.260677][ T7111] __tsan_read8+0x1/0x30 [ 45.264897][ T7111] napi_gro_receive+0x7c/0x330 [ 45.269736][ T7111] receive_buf+0x284/0x30b0 [ 45.274223][ T7111] virtnet_poll+0x436/0x7d0 [ 45.278706][ T7111] net_rx_action+0x3ae/0xa90 [ 45.283268][ T7111] [ 45.285579][ T7111] read to 0xffffffff86040b80 of 8 bytes by task 7111 on cpu 1: [ 45.293114][ T7111] ktime_get_seconds+0x45/0x70 [ 45.297855][ T7111] tcp_rcv_established+0xeeb/0xf50 [ 45.302958][ T7111] tcp_v4_do_rcv+0x381/0x4e0 [ 45.307540][ T7111] __release_sock+0x135/0x1e0 [ 45.312194][ T7111] release_sock+0x61/0x160 [ 45.316604][ T7111] tcp_recvmsg+0x63b/0x1a30 [ 45.321086][ T7111] inet_recvmsg+0xbb/0x250 [ 45.325509][ T7111] sock_recvmsg+0x92/0xb0 [ 45.329815][ T7111] sock_read_iter+0x15f/0x1e0 [ 45.334480][ T7111] new_sync_read+0x389/0x4f0 [ 45.339054][ T7111] __vfs_read+0xb1/0xc0 [ 45.343186][ T7111] vfs_read+0x143/0x2c0 [ 45.347320][ T7111] ksys_read+0xd5/0x1b0 [ 45.351547][ T7111] [ 45.353859][ T7111] Reported by Kernel Concurrency Sanitizer on: [ 45.360003][ T7111] CPU: 1 PID: 7111 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.367435][ T7111] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.377480][ T7111] ================================================================== [ 45.385559][ T7111] Kernel panic - not syncing: panic_on_warn set ... [ 45.393965][ T7111] CPU: 1 PID: 7111 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 45.401395][ T7111] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.411437][ T7111] Call Trace: [ 45.414724][ T7111] dump_stack+0xf5/0x159 [ 45.418959][ T7111] panic+0x210/0x640 [ 45.422922][ T7111] ? sock_read_iter+0x15f/0x1e0 [ 45.427763][ T7111] ? vprintk_func+0x8d/0x140 [ 45.432348][ T7111] kcsan_report.cold+0xc/0x10 [ 45.437018][ T7111] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 45.442542][ T7111] __tsan_read8+0x2c/0x30 [ 45.446849][ T7111] ktime_get_seconds+0x45/0x70 [ 45.451608][ T7111] tcp_rcv_established+0xeeb/0xf50 [ 45.456712][ T7111] ? ipv4_dst_check+0xc6/0xf0 [ 45.461373][ T7111] tcp_v4_do_rcv+0x381/0x4e0 [ 45.466926][ T7111] __release_sock+0x135/0x1e0 [ 45.471588][ T7111] release_sock+0x61/0x160 [ 45.475988][ T7111] tcp_recvmsg+0x63b/0x1a30 [ 45.480486][ T7111] inet_recvmsg+0xbb/0x250 [ 45.484901][ T7111] ? __tsan_read8+0x2c/0x30 [ 45.489398][ T7111] ? inet_sendpage+0x100/0x100 [ 45.494154][ T7111] sock_recvmsg+0x92/0xb0 [ 45.498472][ T7111] sock_read_iter+0x15f/0x1e0 [ 45.503133][ T7111] new_sync_read+0x389/0x4f0 [ 45.507706][ T7111] __vfs_read+0xb1/0xc0 [ 45.511841][ T7111] vfs_read+0x143/0x2c0 [ 45.515983][ T7111] ksys_read+0xd5/0x1b0 [ 45.520129][ T7111] __x64_sys_read+0x4c/0x60 [ 45.524611][ T7111] do_syscall_64+0xcc/0x370 [ 45.529093][ T7111] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 45.535060][ T7111] RIP: 0033:0x47c530 [ 45.538948][ T7111] 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 [ 45.559047][ T7111] RSP: 002b:000000c4203bd810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 45.567434][ T7111] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 45.575384][ T7111] RDX: 0000000000001000 RSI: 000000c4203d2000 RDI: 0000000000000003 [ 45.583337][ T7111] RBP: 000000c4203bd868 R08: 0000000000000000 R09: 0000000000000000 [ 45.591285][ T7111] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000002 [ 45.599252][ T7111] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 45.608699][ T7111] Kernel Offset: disabled [ 45.613050][ T7111] Rebooting in 86400 seconds..