[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.335154][ T26] audit: type=1800 audit(1571544259.368:25): pid=7002 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.363752][ T26] audit: type=1800 audit(1571544259.368:26): pid=7002 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.398890][ T26] audit: type=1800 audit(1571544259.368:27): pid=7002 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 '10.128.0.167' (ECDSA) to the list of known hosts. 2019/10/20 04:04:29 fuzzer started 2019/10/20 04:04:30 dialing manager at 10.128.0.105:43535 2019/10/20 04:04:30 syscalls: 2524 2019/10/20 04:04:30 code coverage: enabled 2019/10/20 04:04:30 comparison tracing: enabled 2019/10/20 04:04:30 extra coverage: extra coverage is not supported by the kernel 2019/10/20 04:04:30 setuid sandbox: enabled 2019/10/20 04:04:30 namespace sandbox: enabled 2019/10/20 04:04:30 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/20 04:04:30 fault injection: enabled 2019/10/20 04:04:30 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/20 04:04:30 net packet injection: enabled 2019/10/20 04:04:30 net device setup: enabled 2019/10/20 04:04:30 concurrency sanitizer: enabled syzkaller login: [ 47.371494][ T7170] ================================================================== [ 47.379656][ T7170] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 47.387532][ T7170] [ 47.389891][ T7170] write to 0xffffffff86040b08 of 280 bytes by interrupt on cpu 1: [ 47.397721][ T7170] timekeeping_advance+0x893/0xd80 [ 47.402857][ T7170] update_wall_time+0x19/0x20 [ 47.407515][ T7170] tick_do_update_jiffies64+0x1ae/0x260 [ 47.413039][ T7170] tick_sched_do_timer+0xd4/0xe0 [ 47.417967][ T7170] tick_sched_timer+0x43/0xe0 [ 47.422625][ T7170] __hrtimer_run_queues+0x288/0x600 [ 47.427801][ T7170] hrtimer_interrupt+0x22a/0x480 [ 47.432747][ T7170] smp_apic_timer_interrupt+0xdc/0x280 [ 47.438213][ T7170] apic_timer_interrupt+0xf/0x20 [ 47.443134][ T7170] __kcsan_check_watchpoint+0xba/0x180 [ 47.448569][ T7170] __tsan_read4+0x15/0x30 [ 47.452888][ T7170] tcp_v4_rcv+0x18cf/0x1bb0 [ 47.457372][ T7170] ip_protocol_deliver_rcu+0x4d/0x420 [ 47.462722][ T7170] ip_local_deliver_finish+0x110/0x140 [ 47.468154][ T7170] [ 47.470476][ T7170] read to 0xffffffff86040b80 of 8 bytes by task 7170 on cpu 0: [ 47.477993][ T7170] ktime_get_seconds+0x45/0x70 [ 47.482734][ T7170] tcp_rcv_established+0xeeb/0xf50 [ 47.487839][ T7170] tcp_v4_do_rcv+0x381/0x4e0 [ 47.492409][ T7170] __release_sock+0x135/0x1e0 [ 47.497080][ T7170] release_sock+0x61/0x160 [ 47.501484][ T7170] tcp_recvmsg+0x63b/0x1a30 [ 47.505966][ T7170] inet_recvmsg+0xbb/0x250 [ 47.510384][ T7170] sock_recvmsg+0x92/0xb0 [ 47.514692][ T7170] sock_read_iter+0x15f/0x1e0 [ 47.519360][ T7170] new_sync_read+0x389/0x4f0 [ 47.523928][ T7170] __vfs_read+0xb1/0xc0 [ 47.528063][ T7170] vfs_read+0x143/0x2c0 [ 47.532210][ T7170] ksys_read+0xd5/0x1b0 [ 47.536338][ T7170] [ 47.538640][ T7170] Reported by Kernel Concurrency Sanitizer on: [ 47.544772][ T7170] CPU: 0 PID: 7170 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.552199][ T7170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.562231][ T7170] ================================================================== [ 47.570283][ T7170] Kernel panic - not syncing: panic_on_warn set ... [ 47.576850][ T7170] CPU: 0 PID: 7170 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.584455][ T7170] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.594487][ T7170] Call Trace: [ 47.597762][ T7170] dump_stack+0xf5/0x159 [ 47.601986][ T7170] panic+0x210/0x640 [ 47.605878][ T7170] ? sock_read_iter+0x15f/0x1e0 [ 47.610708][ T7170] ? vprintk_func+0x8d/0x140 [ 47.615295][ T7170] kcsan_report.cold+0xc/0x10 [ 47.619956][ T7170] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 47.625482][ T7170] __tsan_read8+0x2c/0x30 [ 47.629791][ T7170] ktime_get_seconds+0x45/0x70 [ 47.634540][ T7170] tcp_rcv_established+0xeeb/0xf50 [ 47.639638][ T7170] ? ipv4_dst_check+0xc6/0xf0 [ 47.644304][ T7170] tcp_v4_do_rcv+0x381/0x4e0 [ 47.648887][ T7170] __release_sock+0x135/0x1e0 [ 47.653561][ T7170] release_sock+0x61/0x160 [ 47.657977][ T7170] tcp_recvmsg+0x63b/0x1a30 [ 47.662489][ T7170] inet_recvmsg+0xbb/0x250 [ 47.667511][ T7170] ? __tsan_read8+0x2c/0x30 [ 47.671999][ T7170] ? inet_sendpage+0x100/0x100 [ 47.676758][ T7170] sock_recvmsg+0x92/0xb0 [ 47.681117][ T7170] sock_read_iter+0x15f/0x1e0 [ 47.685801][ T7170] new_sync_read+0x389/0x4f0 [ 47.690437][ T7170] __vfs_read+0xb1/0xc0 [ 47.694581][ T7170] vfs_read+0x143/0x2c0 [ 47.698720][ T7170] ksys_read+0xd5/0x1b0 [ 47.702868][ T7170] __x64_sys_read+0x4c/0x60 [ 47.707367][ T7170] do_syscall_64+0xcc/0x370 [ 47.711865][ T7170] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 47.717740][ T7170] RIP: 0033:0x47c530 [ 47.721629][ T7170] 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 [ 47.741254][ T7170] RSP: 002b:000000c420051810 EFLAGS: 00000202 ORIG_RAX: 0000000000000000 [ 47.749660][ T7170] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 47.757610][ T7170] RDX: 0000000000001000 RSI: 000000c4200aa000 RDI: 0000000000000003 [ 47.765579][ T7170] RBP: 000000c420051868 R08: 0000000000000000 R09: 0000000000000000 [ 47.773615][ T7170] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000010 [ 47.781569][ T7170] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 47.791103][ T7170] Kernel Offset: disabled [ 47.795450][ T7170] Rebooting in 86400 seconds..