[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.640863][ T25] audit: type=1800 audit(1570247955.906:25): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.668760][ T25] audit: type=1800 audit(1570247955.906:26): pid=7066 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.696957][ T25] audit: type=1800 audit(1570247955.906:27): pid=7066 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 '10.128.0.37' (ECDSA) to the list of known hosts. 2019/10/05 03:59:27 fuzzer started 2019/10/05 03:59:29 dialing manager at 10.128.0.105:35709 2019/10/05 03:59:29 syscalls: 2523 2019/10/05 03:59:29 code coverage: enabled 2019/10/05 03:59:29 comparison tracing: enabled 2019/10/05 03:59:29 extra coverage: extra coverage is not supported by the kernel 2019/10/05 03:59:29 setuid sandbox: enabled 2019/10/05 03:59:29 namespace sandbox: enabled 2019/10/05 03:59:29 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/05 03:59:29 fault injection: enabled 2019/10/05 03:59:29 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/05 03:59:29 net packet injection: enabled 2019/10/05 03:59:29 net device setup: enabled 2019/10/05 03:59:29 concurrency sanitizer: enabled syzkaller login: [ 48.195960][ T7221] ================================================================== [ 48.204260][ T7221] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 48.212179][ T7221] [ 48.214488][ T7221] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 1: [ 48.222319][ T7221] timekeeping_advance+0x893/0xd80 [ 48.227406][ T7221] update_wall_time+0x19/0x20 [ 48.232062][ T7221] tick_do_update_jiffies64+0x1ae/0x260 [ 48.237586][ T7221] tick_sched_do_timer+0xd4/0xe0 [ 48.242500][ T7221] tick_sched_timer+0x43/0xe0 [ 48.247158][ T7221] __hrtimer_run_queues+0x288/0x600 [ 48.252335][ T7221] hrtimer_interrupt+0x22a/0x480 [ 48.257414][ T7221] smp_apic_timer_interrupt+0xdc/0x280 [ 48.262850][ T7221] apic_timer_interrupt+0xf/0x20 [ 48.267778][ T7221] __kcsan_setup_watchpoint+0x272/0x500 [ 48.273300][ T7221] __tsan_read4+0x2c/0x30 [ 48.277616][ T7221] skb_gro_reset_offset+0xa5/0x1a0 [ 48.282702][ T7221] napi_gro_receive+0x71/0x330 [ 48.287445][ T7221] receive_buf+0x284/0x30b0 [ 48.291915][ T7221] [ 48.294240][ T7221] read to 0xffffffff8603db80 of 8 bytes by task 7221 on cpu 0: [ 48.301843][ T7221] ktime_get_seconds+0x49/0x60 [ 48.306587][ T7221] tcp_rcv_established+0xeeb/0xf50 [ 48.311675][ T7221] tcp_v4_do_rcv+0x381/0x4e0 [ 48.316246][ T7221] __release_sock+0x135/0x1e0 [ 48.321000][ T7221] release_sock+0x61/0x160 [ 48.325485][ T7221] tcp_recvmsg+0x63b/0x1a30 [ 48.329969][ T7221] inet_recvmsg+0xbb/0x250 [ 48.334365][ T7221] sock_recvmsg+0x92/0xb0 [ 48.338672][ T7221] sock_read_iter+0x15f/0x1e0 [ 48.343512][ T7221] new_sync_read+0x389/0x4f0 [ 48.348090][ T7221] __vfs_read+0xb1/0xc0 [ 48.352234][ T7221] vfs_read+0x143/0x2c0 [ 48.356368][ T7221] ksys_read+0xd5/0x1b0 [ 48.360508][ T7221] [ 48.362821][ T7221] Reported by Kernel Concurrency Sanitizer on: [ 48.368951][ T7221] CPU: 0 PID: 7221 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.376116][ T7221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.386146][ T7221] ================================================================== [ 48.394282][ T7221] Kernel panic - not syncing: panic_on_warn set ... [ 48.400859][ T7221] CPU: 0 PID: 7221 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.407958][ T7221] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.418136][ T7221] Call Trace: [ 48.421438][ T7221] dump_stack+0xf5/0x159 [ 48.425665][ T7221] panic+0x209/0x639 [ 48.429546][ T7221] ? vprintk_func+0x8d/0x140 [ 48.434118][ T7221] kcsan_report.cold+0x57/0xeb [ 48.438862][ T7221] __kcsan_setup_watchpoint+0x342/0x500 [ 48.444411][ T7221] __tsan_read8+0x2c/0x30 [ 48.448725][ T7221] ktime_get_seconds+0x49/0x60 [ 48.453473][ T7221] tcp_rcv_established+0xeeb/0xf50 [ 48.458583][ T7221] ? ipv4_dst_check+0xc6/0xf0 [ 48.463261][ T7221] tcp_v4_do_rcv+0x381/0x4e0 [ 48.467834][ T7221] __release_sock+0x135/0x1e0 [ 48.472494][ T7221] release_sock+0x61/0x160 [ 48.476892][ T7221] tcp_recvmsg+0x63b/0x1a30 [ 48.481469][ T7221] inet_recvmsg+0xbb/0x250 [ 48.485973][ T7221] ? __tsan_read8+0x2c/0x30 [ 48.490468][ T7221] ? inet_sendpage+0x100/0x100 [ 48.495214][ T7221] sock_recvmsg+0x92/0xb0 [ 48.499523][ T7221] sock_read_iter+0x15f/0x1e0 [ 48.504190][ T7221] new_sync_read+0x389/0x4f0 [ 48.508764][ T7221] __vfs_read+0xb1/0xc0 [ 48.512914][ T7221] vfs_read+0x143/0x2c0 [ 48.517056][ T7221] ksys_read+0xd5/0x1b0 [ 48.521191][ T7221] __x64_sys_read+0x4c/0x60 [ 48.525673][ T7221] do_syscall_64+0xcf/0x2f0 [ 48.530179][ T7221] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 48.536187][ T7221] RIP: 0033:0x47c530 [ 48.540068][ 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 [ 48.563740][ T7221] RSP: 002b:000000c4204f17d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 48.572151][ T7221] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 48.580102][ T7221] RDX: 0000000000001000 RSI: 000000c420134000 RDI: 0000000000000003 [ 48.588053][ T7221] RBP: 000000c4204f1830 R08: 0000000000000000 R09: 0000000000000000 [ 48.596009][ T7221] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000100 [ 48.603962][ T7221] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 48.613249][ T7221] Kernel Offset: disabled [ 48.617584][ T7221] Rebooting in 86400 seconds..