[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.096712][ T26] audit: type=1800 audit(1571092191.704:25): pid=7110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.116723][ T26] audit: type=1800 audit(1571092191.704:26): pid=7110 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.149426][ T26] audit: type=1800 audit(1571092191.714:27): pid=7110 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 '10.128.10.51' (ECDSA) to the list of known hosts. 2019/10/14 22:30:02 fuzzer started 2019/10/14 22:30:03 dialing manager at 10.128.0.105:33683 2019/10/14 22:30:03 syscalls: 2523 2019/10/14 22:30:03 code coverage: enabled 2019/10/14 22:30:03 comparison tracing: enabled 2019/10/14 22:30:03 extra coverage: extra coverage is not supported by the kernel 2019/10/14 22:30:03 setuid sandbox: enabled 2019/10/14 22:30:03 namespace sandbox: enabled 2019/10/14 22:30:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 22:30:03 fault injection: enabled 2019/10/14 22:30:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 22:30:03 net packet injection: enabled 2019/10/14 22:30:03 net device setup: enabled 2019/10/14 22:30:03 concurrency sanitizer: enabled syzkaller login: [ 48.330674][ C1] ================================================================== [ 48.339263][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 48.347425][ C1] [ 48.349844][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 48.357471][ C1] tick_sched_do_timer+0xc0/0xe0 [ 48.362687][ C1] tick_sched_timer+0x43/0xe0 [ 48.367536][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.372733][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.377682][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.383128][ C1] apic_timer_interrupt+0xf/0x20 [ 48.388064][ C1] __kcsan_setup_watchpoint+0xa8/0x510 [ 48.393510][ C1] __tsan_write1+0x32/0x40 [ 48.397929][ C1] skb_clone+0x113/0x280 [ 48.402159][ C1] packet_rcv_spkt+0x2e2/0x350 [ 48.406917][ C1] __netif_receive_skb_core+0xe13/0x1a90 [ 48.412557][ C1] __netif_receive_skb_one_core+0x67/0xe0 [ 48.418268][ C1] __netif_receive_skb+0x37/0xf0 [ 48.423209][ C1] netif_receive_skb_internal+0x59/0x190 [ 48.428820][ C1] [ 48.431139][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 48.438672][ C1] tick_sched_do_timer+0x33/0xe0 [ 48.443605][ C1] tick_sched_timer+0x43/0xe0 [ 48.448299][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.453477][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.458396][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.463833][ C1] apic_timer_interrupt+0xf/0x20 [ 48.468761][ C1] [ 48.471068][ C1] Reported by Kernel Concurrency Sanitizer on: [ 48.477214][ C1] CPU: 1 PID: 7268 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.484311][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.494491][ C1] ================================================================== [ 48.502550][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 48.509468][ C1] CPU: 1 PID: 7268 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 48.516552][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.526679][ C1] Call Trace: [ 48.529940][ C1] [ 48.532778][ C1] dump_stack+0xf5/0x159 [ 48.537252][ C1] panic+0x209/0x639 [ 48.541151][ C1] ? vprintk_func+0x8d/0x140 [ 48.545732][ C1] kcsan_report.cold+0xc/0x1b [ 48.550391][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 48.555944][ C1] __tsan_read4+0x2c/0x30 [ 48.560266][ C1] tick_sched_do_timer+0x33/0xe0 [ 48.565273][ C1] tick_sched_timer+0x43/0xe0 [ 48.569939][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.575154][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 48.580288][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.585274][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.590737][ C1] apic_timer_interrupt+0xf/0x20 [ 48.595651][ C1] [ 48.598581][ C1] RIP: 0033:0x6087e8 [ 48.602478][ C1] Code: ac 24 98 00 00 00 48 81 c4 a0 00 00 00 c3 e8 ef 13 e5 ff 48 89 df 48 8d 05 15 42 37 00 e8 e0 13 e5 ff eb cf 0f 84 4c 05 00 00 <48> 3d 09 01 00 00 0f 8d 29 04 00 00 48 8d 90 02 ff ff ff 31 c0 48 [ 48.622071][ C1] RSP: 002b:000000c420355a80 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 48.630494][ C1] RAX: 0000000000000103 RBX: 000000c420310000 RCX: 0000000000000000 [ 48.638630][ C1] RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000103 [ 48.646614][ C1] RBP: 000000c420355b18 R08: 0000000000001036 R09: 0000000000000218 [ 48.654658][ C1] R10: ffffffffffffffff R11: 0000000000002002 R12: 0000000000000004 [ 48.662801][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 48.672284][ C1] Kernel Offset: disabled [ 48.676629][ C1] Rebooting in 86400 seconds..