[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.650592][ T25] audit: type=1800 audit(1570865440.537:25): pid=7064 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.677794][ T25] audit: type=1800 audit(1570865440.537:26): pid=7064 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.698011][ T25] audit: type=1800 audit(1570865440.537:27): pid=7064 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 '10.128.1.11' (ECDSA) to the list of known hosts. 2019/10/12 07:30:47 fuzzer started 2019/10/12 07:30:48 dialing manager at 10.128.0.105:43913 2019/10/12 07:30:48 syscalls: 2523 2019/10/12 07:30:48 code coverage: enabled 2019/10/12 07:30:48 comparison tracing: enabled 2019/10/12 07:30:48 extra coverage: extra coverage is not supported by the kernel 2019/10/12 07:30:48 setuid sandbox: enabled 2019/10/12 07:30:48 namespace sandbox: enabled 2019/10/12 07:30:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 07:30:48 fault injection: enabled 2019/10/12 07:30:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 07:30:48 net packet injection: enabled 2019/10/12 07:30:48 net device setup: enabled 2019/10/12 07:30:48 concurrency sanitizer: enabled syzkaller login: [ 43.245720][ C0] ================================================================== [ 43.253852][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 43.261896][ C0] [ 43.264217][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 43.271742][ C0] tick_sched_do_timer+0x33/0xe0 [ 43.276655][ C0] tick_sched_timer+0x43/0xe0 [ 43.281309][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.286484][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.291400][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.296833][ C0] apic_timer_interrupt+0xf/0x20 [ 43.301750][ C0] __kcsan_setup_watchpoint+0x96/0x510 [ 43.307197][ C0] __tsan_read4+0x2c/0x30 [ 43.311502][ C0] skb_push+0x5c/0xb0 [ 43.315460][ C0] packet_rcv_spkt+0x251/0x350 [ 43.320199][ C0] __netif_receive_skb_core+0xe13/0x1a90 [ 43.325805][ C0] __netif_receive_skb_one_core+0x67/0xe0 [ 43.331537][ C0] __netif_receive_skb+0x37/0xf0 [ 43.336484][ C0] netif_receive_skb_internal+0x59/0x190 [ 43.342533][ C0] [ 43.344837][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 43.352443][ C0] tick_sched_do_timer+0xc0/0xe0 [ 43.357352][ C0] tick_sched_timer+0x43/0xe0 [ 43.362005][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.367223][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.372140][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.377611][ C0] apic_timer_interrupt+0xf/0x20 [ 43.382514][ C0] [ 43.384815][ C0] Reported by Kernel Concurrency Sanitizer on: [ 43.390942][ C0] CPU: 0 PID: 7227 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 43.398026][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.408058][ C0] ================================================================== [ 43.416098][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 43.422663][ C0] CPU: 0 PID: 7227 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 43.429751][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.439783][ C0] Call Trace: [ 43.443043][ C0] [ 43.445881][ C0] dump_stack+0xf5/0x159 [ 43.450103][ C0] panic+0x209/0x639 [ 43.453980][ C0] ? vprintk_func+0x8d/0x140 [ 43.458547][ C0] kcsan_report.cold+0xc/0x1b [ 43.463203][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 43.468727][ C0] __tsan_write4+0x32/0x40 [ 43.473119][ C0] tick_sched_do_timer+0xc0/0xe0 [ 43.478076][ C0] tick_sched_timer+0x43/0xe0 [ 43.482733][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.487909][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 43.493004][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.497924][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.503430][ C0] apic_timer_interrupt+0xf/0x20 [ 43.508350][ C0] [ 43.511275][ C0] RIP: 0033:0x609a9e [ 43.515167][ C0] Code: f9 c1 ef 09 23 b8 20 08 00 00 4c 39 c7 0f 83 e9 00 00 00 8b 14 ba 89 d7 83 e2 0f 48 39 f2 76 0a 48 89 54 24 20 e9 4a ff ff ff <48> 85 d2 0f 85 86 00 00 00 48 8b 43 10 48 89 44 24 28 48 8d 05 29 [ 43.534757][ C0] RSP: 002b:000000c4203c1a40 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 43.543153][ C0] RAX: 000000c420314028 RBX: 000000c420314000 RCX: 000000c420001800 [ 43.551106][ C0] RDX: 0000000000000009 RSI: 0000000000000011 RDI: 00000000000008d9 [ 43.559067][ C0] RBP: 000000c4203c1a70 R08: 00000000000008d9 R09: 000000000000191b [ 43.567054][ C0] R10: ffffffffffffffff R11: 0000000000000212 R12: 0000000000000004 [ 43.575014][ C0] R13: ffffffffffffffff R14: 0000000000000020 R15: ffffffffffffffff [ 43.584367][ C0] Kernel Offset: disabled [ 43.588713][ C0] Rebooting in 86400 seconds..