[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 42.935507][ T26] audit: type=1800 audit(1570789225.475:25): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 42.963862][ T26] audit: type=1800 audit(1570789225.475:26): pid=7118 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [ 43.413256][ T7183] sshd (7183) used greatest stack depth: 10032 bytes left [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.0.87' (ECDSA) to the list of known hosts. 2019/10/11 10:20:34 fuzzer started 2019/10/11 10:20:36 dialing manager at 10.128.0.105:37331 2019/10/11 10:20:36 syscalls: 2523 2019/10/11 10:20:36 code coverage: enabled 2019/10/11 10:20:36 comparison tracing: enabled 2019/10/11 10:20:36 extra coverage: extra coverage is not supported by the kernel 2019/10/11 10:20:36 setuid sandbox: enabled 2019/10/11 10:20:36 namespace sandbox: enabled 2019/10/11 10:20:36 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/11 10:20:36 fault injection: enabled 2019/10/11 10:20:36 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/11 10:20:36 net packet injection: enabled 2019/10/11 10:20:36 net device setup: enabled 2019/10/11 10:20:36 concurrency sanitizer: enabled syzkaller login: [ 53.899357][ T7269] ================================================================== [ 53.907523][ T7269] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 53.915401][ T7269] [ 53.917713][ T7269] write to 0xffffffff8603db08 of 280 bytes by interrupt on cpu 1: [ 53.925636][ T7269] timekeeping_advance+0x893/0xd80 [ 53.930771][ T7269] update_wall_time+0x19/0x20 [ 53.935424][ T7269] tick_do_update_jiffies64+0x1ae/0x260 [ 53.940955][ T7269] tick_sched_do_timer+0xd4/0xe0 [ 53.945870][ T7269] tick_sched_timer+0x43/0xe0 [ 53.950532][ T7269] __hrtimer_run_queues+0x288/0x600 [ 53.955779][ T7269] hrtimer_interrupt+0x22a/0x480 [ 53.960692][ T7269] smp_apic_timer_interrupt+0xdc/0x280 [ 53.966122][ T7269] apic_timer_interrupt+0xf/0x20 [ 53.971048][ T7269] __kcsan_setup_watchpoint+0x0/0x510 [ 53.976403][ T7269] ipt_do_table+0x8bf/0xe40 [ 53.980891][ T7269] iptable_security_hook+0x4a/0x60 [ 53.985981][ T7269] nf_hook_slow+0x83/0x160 [ 53.990510][ T7269] ip_local_deliver+0x1e5/0x210 [ 53.995358][ T7269] [ 53.997666][ T7269] read to 0xffffffff8603db80 of 8 bytes by task 7269 on cpu 0: [ 54.005188][ T7269] ktime_get_seconds+0x49/0x60 [ 54.009932][ T7269] tcp_rcv_established+0xeeb/0xf50 [ 54.015020][ T7269] tcp_v4_do_rcv+0x381/0x4e0 [ 54.019593][ T7269] __release_sock+0x135/0x1e0 [ 54.024247][ T7269] release_sock+0x61/0x160 [ 54.028646][ T7269] tcp_recvmsg+0x63b/0x1a30 [ 54.033129][ T7269] inet_recvmsg+0xbb/0x250 [ 54.037527][ T7269] sock_recvmsg+0x92/0xb0 [ 54.041831][ T7269] sock_read_iter+0x15f/0x1e0 [ 54.046483][ T7269] new_sync_read+0x389/0x4f0 [ 54.051051][ T7269] __vfs_read+0xb1/0xc0 [ 54.055184][ T7269] vfs_read+0x143/0x2c0 [ 54.059322][ T7269] ksys_read+0xd5/0x1b0 [ 54.063453][ T7269] [ 54.065930][ T7269] Reported by Kernel Concurrency Sanitizer on: [ 54.072502][ T7269] CPU: 0 PID: 7269 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.079593][ T7269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.089714][ T7269] ================================================================== [ 54.097748][ T7269] Kernel panic - not syncing: panic_on_warn set ... [ 54.104322][ T7269] CPU: 0 PID: 7269 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.111403][ T7269] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.121445][ T7269] Call Trace: [ 54.124717][ T7269] dump_stack+0xf5/0x159 [ 54.128945][ T7269] panic+0x209/0x639 [ 54.132822][ T7269] ? sock_read_iter+0x15f/0x1e0 [ 54.137662][ T7269] ? vprintk_func+0x8d/0x140 [ 54.142241][ T7269] kcsan_report.cold+0xc/0x1b [ 54.146897][ T7269] __kcsan_setup_watchpoint+0x3ee/0x510 [ 54.152419][ T7269] __tsan_read8+0x2c/0x30 [ 54.156757][ T7269] ktime_get_seconds+0x49/0x60 [ 54.161502][ T7269] tcp_rcv_established+0xeeb/0xf50 [ 54.166593][ T7269] ? ipv4_dst_check+0xc6/0xf0 [ 54.171252][ T7269] tcp_v4_do_rcv+0x381/0x4e0 [ 54.175826][ T7269] __release_sock+0x135/0x1e0 [ 54.180659][ T7269] release_sock+0x61/0x160 [ 54.185061][ T7269] tcp_recvmsg+0x63b/0x1a30 [ 54.189551][ T7269] inet_recvmsg+0xbb/0x250 [ 54.193943][ T7269] ? __tsan_read8+0x2c/0x30 [ 54.198421][ T7269] ? inet_sendpage+0x100/0x100 [ 54.203251][ T7269] sock_recvmsg+0x92/0xb0 [ 54.207559][ T7269] sock_read_iter+0x15f/0x1e0 [ 54.212219][ T7269] new_sync_read+0x389/0x4f0 [ 54.216810][ T7269] __vfs_read+0xb1/0xc0 [ 54.220944][ T7269] vfs_read+0x143/0x2c0 [ 54.225079][ T7269] ksys_read+0xd5/0x1b0 [ 54.229272][ T7269] __x64_sys_read+0x4c/0x60 [ 54.233770][ T7269] do_syscall_64+0xcf/0x2f0 [ 54.238265][ T7269] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.244132][ T7269] RIP: 0033:0x47c530 [ 54.248006][ T7269] 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 [ 54.267595][ T7269] RSP: 002b:000000c4203c37d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 54.275992][ T7269] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 54.283958][ T7269] RDX: 0000000000001000 RSI: 000000c4201b8000 RDI: 0000000000000003 [ 54.292028][ T7269] RBP: 000000c4203c3830 R08: 0000000000000000 R09: 0000000000000000 [ 54.299976][ T7269] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000200 [ 54.307932][ T7269] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 54.319832][ T7269] Kernel Offset: disabled [ 54.324241][ T7269] Rebooting in 86400 seconds..