[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting periodic command scheduler: cron[?25l[?1c7[ ok 8[?25h[?0c. [....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[ ok 8[?25h[?0c. [ 46.685447][ T26] kauditd_printk_skb: 8 callbacks suppressed [ 46.685458][ T26] audit: type=1800 audit(1571006390.758:29): pid=7196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rc.local" dev="sda1" ino=2465 res=0 [ 46.711886][ T26] audit: type=1800 audit(1571006390.758:30): pid=7196 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rmnologin" dev="sda1" ino=2456 res=0 Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.15.217' (ECDSA) to the list of known hosts. 2019/10/13 22:39:57 fuzzer started 2019/10/13 22:39:59 dialing manager at 10.128.0.105:40973 2019/10/13 22:39:59 syscalls: 2523 2019/10/13 22:39:59 code coverage: enabled 2019/10/13 22:39:59 comparison tracing: enabled 2019/10/13 22:39:59 extra coverage: extra coverage is not supported by the kernel 2019/10/13 22:39:59 setuid sandbox: enabled 2019/10/13 22:39:59 namespace sandbox: enabled 2019/10/13 22:39:59 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/13 22:39:59 fault injection: enabled 2019/10/13 22:39:59 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/13 22:39:59 net packet injection: enabled 2019/10/13 22:39:59 net device setup: enabled 2019/10/13 22:39:59 concurrency sanitizer: enabled syzkaller login: [ 55.708880][ C0] ================================================================== [ 55.717051][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 55.725275][ C0] [ 55.727588][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 55.735209][ C0] tick_sched_do_timer+0x33/0xe0 [ 55.740228][ C0] tick_sched_timer+0x43/0xe0 [ 55.744918][ C0] __hrtimer_run_queues+0x288/0x600 [ 55.750096][ C0] hrtimer_interrupt+0x22a/0x480 [ 55.755121][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 55.760556][ C0] apic_timer_interrupt+0xf/0x20 [ 55.765471][ C0] __kcsan_check_watchpoint+0x51/0x180 [ 55.771027][ C0] __tsan_read2+0x15/0x30 [ 55.775334][ C0] page_frag_alloc+0x52/0x2d0 [ 55.779996][ C0] __napi_alloc_skb+0x172/0x210 [ 55.784821][ C0] page_to_skb+0x8d/0x480 [ 55.789126][ C0] receive_buf+0x17c7/0x30b0 [ 55.793693][ C0] virtnet_poll+0x436/0x7d0 [ 55.798172][ C0] net_rx_action+0x3ae/0xa50 [ 55.802731][ C0] [ 55.805035][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 55.812644][ C0] tick_sched_do_timer+0xc0/0xe0 [ 55.817659][ C0] tick_sched_timer+0x43/0xe0 [ 55.822313][ C0] __hrtimer_run_queues+0x288/0x600 [ 55.827497][ C0] hrtimer_interrupt+0x22a/0x480 [ 55.832410][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 55.837843][ C0] apic_timer_interrupt+0xf/0x20 [ 55.842750][ C0] [ 55.845049][ C0] Reported by Kernel Concurrency Sanitizer on: [ 55.851349][ C0] CPU: 0 PID: 7350 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.858430][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.869074][ C0] ================================================================== [ 55.877230][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 55.883796][ C0] CPU: 0 PID: 7350 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 55.890903][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.900935][ C0] Call Trace: [ 55.904453][ C0] [ 55.907291][ C0] dump_stack+0xf5/0x159 [ 55.911688][ C0] panic+0x209/0x639 [ 55.915560][ C0] ? vprintk_func+0x8d/0x140 [ 55.920136][ C0] kcsan_report.cold+0xc/0x1b [ 55.924808][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 55.930356][ C0] __tsan_write4+0x32/0x40 [ 55.934758][ C0] tick_sched_do_timer+0xc0/0xe0 [ 55.939676][ C0] tick_sched_timer+0x43/0xe0 [ 55.944332][ C0] __hrtimer_run_queues+0x288/0x600 [ 55.949515][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 55.954606][ C0] hrtimer_interrupt+0x22a/0x480 [ 55.960746][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 55.966205][ C0] apic_timer_interrupt+0xf/0x20 [ 55.971153][ C0] [ 55.974080][ C0] RIP: 0033:0x609a40 [ 55.977960][ C0] Code: 00 48 89 4c 24 58 48 89 44 24 60 48 8b 6c 24 30 48 83 c4 38 c3 8b 53 18 89 d7 81 e2 ff 01 00 00 8b 54 90 08 41 89 d0 83 e2 0f <48> 83 fa 09 0f 86 1b 01 00 00 48 8b 90 10 08 00 00 4c 8b 88 08 08 [ 55.997552][ C0] RSP: 002b:000000c4201bda78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 56.005938][ C0] RAX: 000000c420322850 RBX: 000000c420322000 RCX: 000000c42006ed80 [ 56.013884][ C0] RDX: 0000000000000002 RSI: 000000000000000a RDI: 0000000000000106 [ 56.021831][ C0] RBP: 000000c4201bdaa8 R08: 0000000000000172 R09: 0000000000000106 [ 56.029792][ C0] R10: 00000000ffffffff R11: 000000000000180d R12: 0000000000000007 [ 56.037736][ C0] R13: 000000c420020dc0 R14: 0000000000000004 R15: ffffffffffffffff [ 56.047395][ C0] Kernel Offset: disabled [ 56.051892][ C0] Rebooting in 86400 seconds..