[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.489437][ T25] audit: type=1800 audit(1571721659.542:25): pid=7027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.532473][ T25] audit: type=1800 audit(1571721659.552:26): pid=7027 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.565387][ T25] audit: type=1800 audit(1571721659.552:27): pid=7027 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 '10.128.0.21' (ECDSA) to the list of known hosts. 2019/10/22 05:21:07 fuzzer started 2019/10/22 05:21:09 dialing manager at 10.128.0.105:37053 2019/10/22 05:21:09 syscalls: 2524 2019/10/22 05:21:09 code coverage: enabled 2019/10/22 05:21:09 comparison tracing: enabled 2019/10/22 05:21:09 extra coverage: extra coverage is not supported by the kernel 2019/10/22 05:21:09 setuid sandbox: enabled 2019/10/22 05:21:09 namespace sandbox: enabled 2019/10/22 05:21:09 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 05:21:09 fault injection: enabled 2019/10/22 05:21:09 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 05:21:09 net packet injection: enabled 2019/10/22 05:21:09 net device setup: enabled 2019/10/22 05:21:09 concurrency sanitizer: enabled syzkaller login: [ 47.759611][ C1] ================================================================== [ 47.767837][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 47.775889][ C1] [ 47.778209][ C1] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0: [ 47.785819][ C1] tick_sched_do_timer+0xc0/0xe0 [ 47.790740][ C1] tick_sched_timer+0x43/0xe0 [ 47.795396][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.800577][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.805504][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.810939][ C1] apic_timer_interrupt+0xf/0x20 [ 47.815853][ C1] nf_conntrack_in+0x2ef/0xa80 [ 47.820591][ C1] ipv4_conntrack_in+0x27/0x40 [ 47.825333][ C1] nf_hook_slow+0x83/0x160 [ 47.829724][ C1] ip_rcv+0x12f/0x1a0 [ 47.833681][ C1] __netif_receive_skb_one_core+0xa7/0xe0 [ 47.839374][ C1] __netif_receive_skb+0x37/0xf0 [ 47.844286][ C1] netif_receive_skb_internal+0x59/0x190 [ 47.849893][ C1] napi_gro_receive+0x28f/0x330 [ 47.854712][ C1] [ 47.857017][ C1] read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 47.864537][ C1] tick_sched_do_timer+0x33/0xe0 [ 47.869451][ C1] tick_sched_timer+0x43/0xe0 [ 47.874103][ C1] __hrtimer_run_queues+0x288/0x600 [ 47.879274][ C1] hrtimer_interrupt+0x22a/0x480 [ 47.884200][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 47.889638][ C1] apic_timer_interrupt+0xf/0x20 [ 47.894544][ C1] [ 47.896848][ C1] Reported by Kernel Concurrency Sanitizer on: [ 47.902978][ C1] CPU: 1 PID: 7190 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.910416][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.920459][ C1] ================================================================== [ 47.928501][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 47.935068][ C1] CPU: 1 PID: 7190 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 47.942494][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 47.952526][ C1] Call Trace: [ 47.955786][ C1] [ 47.958643][ C1] dump_stack+0xf5/0x159 [ 47.962866][ C1] panic+0x210/0x640 [ 47.966783][ C1] ? vprintk_func+0x8d/0x140 [ 47.971458][ C1] kcsan_report.cold+0xc/0x10 [ 47.976117][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 47.981642][ C1] __tsan_read4+0x2c/0x30 [ 47.985956][ C1] tick_sched_do_timer+0x33/0xe0 [ 47.990878][ C1] tick_sched_timer+0x43/0xe0 [ 47.995545][ C1] __hrtimer_run_queues+0x288/0x600 [ 48.000724][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 48.005814][ C1] hrtimer_interrupt+0x22a/0x480 [ 48.010794][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 48.016228][ C1] ? do_IRQ+0xcb/0x180 [ 48.020270][ C1] apic_timer_interrupt+0xf/0x20 [ 48.025176][ C1] [ 48.028091][ C1] RIP: 0033:0x609b4e [ 48.031968][ C1] Code: 89 c8 e8 95 00 e5 ff eb cb 48 89 d1 41 d3 e9 48 83 f9 20 19 c0 41 21 c1 44 89 4b 18 48 8b 43 20 48 29 c8 48 89 43 20 c1 ef 04 <48> 89 7c 24 50 0f 57 c0 0f 11 44 24 58 48 8b 6c 24 30 48 83 c4 38 [ 48.051549][ C1] RSP: 002b:000000c42038fa78 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 48.059938][ C1] RAX: 000000000000000a RBX: 000000c4201f2000 RCX: 0000000000000003 [ 48.067889][ C1] RDX: 0000000000000003 RSI: 000000000000000d RDI: 0000000000000102 [ 48.075928][ C1] RBP: 000000c42038faa8 R08: 0000000000001023 R09: 00000000000001b6 [ 48.083879][ C1] R10: 00000000ffffffff R11: 00000000000027be R12: 0000000000000007 [ 48.091826][ C1] R13: 000000c4200829c0 R14: 0000000000000004 R15: ffffffffffffffff [ 48.101111][ C1] Kernel Offset: disabled [ 48.105597][ C1] Rebooting in 86400 seconds..