[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.906439][ T25] audit: type=1800 audit(1570891682.865:25): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.933683][ T25] audit: type=1800 audit(1570891682.865:26): pid=7013 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.961987][ T25] audit: type=1800 audit(1570891682.865:27): pid=7013 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 '10.128.0.204' (ECDSA) to the list of known hosts. 2019/10/12 14:48:09 fuzzer started 2019/10/12 14:48:10 dialing manager at 10.128.0.105:43913 2019/10/12 14:48:10 syscalls: 2523 2019/10/12 14:48:10 code coverage: enabled 2019/10/12 14:48:10 comparison tracing: enabled 2019/10/12 14:48:10 extra coverage: extra coverage is not supported by the kernel 2019/10/12 14:48:10 setuid sandbox: enabled 2019/10/12 14:48:10 namespace sandbox: enabled 2019/10/12 14:48:10 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 14:48:10 fault injection: enabled 2019/10/12 14:48:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 14:48:10 net packet injection: enabled 2019/10/12 14:48:10 net device setup: enabled 2019/10/12 14:48:10 concurrency sanitizer: enabled syzkaller login: [ 44.738879][ C0] ================================================================== [ 44.746995][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 44.755380][ C0] [ 44.757690][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 44.765300][ C0] tick_sched_do_timer+0xc0/0xe0 [ 44.770215][ C0] tick_sched_timer+0x43/0xe0 [ 44.774898][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.780079][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.784993][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.790431][ C0] apic_timer_interrupt+0xf/0x20 [ 44.795347][ C0] __kcsan_setup_watchpoint+0x282/0x510 [ 44.801488][ C0] __tsan_read4+0x2c/0x30 [ 44.805794][ C0] virtqueue_add+0xa6a/0x1a80 [ 44.810459][ C0] virtqueue_add_inbuf_ctx+0x50/0x6a [ 44.815731][ C0] try_fill_recv+0x68e/0xdc0 [ 44.820320][ C0] virtnet_poll+0x64c/0x7d0 [ 44.824796][ C0] net_rx_action+0x3ae/0xa50 [ 44.829364][ C0] __do_softirq+0x115/0x33f [ 44.833835][ C0] [ 44.836139][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 44.843657][ C0] tick_sched_do_timer+0x33/0xe0 [ 44.848589][ C0] tick_sched_timer+0x43/0xe0 [ 44.853299][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.858475][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.863399][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.868837][ C0] apic_timer_interrupt+0xf/0x20 [ 44.873753][ C0] [ 44.876081][ C0] Reported by Kernel Concurrency Sanitizer on: [ 44.882214][ C0] CPU: 0 PID: 7180 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.889293][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.899333][ C0] ================================================================== [ 44.907368][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 44.913930][ C0] CPU: 0 PID: 7180 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 44.921010][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.931041][ C0] Call Trace: [ 44.934309][ C0] [ 44.937160][ C0] dump_stack+0xf5/0x159 [ 44.941384][ C0] panic+0x209/0x639 [ 44.945258][ C0] ? vprintk_func+0x8d/0x140 [ 44.949828][ C0] kcsan_report.cold+0xc/0x1b [ 44.954482][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 44.960006][ C0] __tsan_read4+0x2c/0x30 [ 44.964323][ C0] tick_sched_do_timer+0x33/0xe0 [ 44.969251][ C0] tick_sched_timer+0x43/0xe0 [ 44.973996][ C0] __hrtimer_run_queues+0x288/0x600 [ 44.979173][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 44.984280][ C0] hrtimer_interrupt+0x22a/0x480 [ 44.989203][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 44.994695][ C0] apic_timer_interrupt+0xf/0x20 [ 44.999606][ C0] [ 45.002521][ C0] RIP: 0033:0x6086c8 [ 45.006396][ C0] Code: 8b 54 24 20 48 85 c9 0f 85 c3 07 00 00 48 3d 00 01 00 00 0f 8d 2b 01 00 00 48 8b 8c 24 88 00 00 00 48 8d 91 88 10 00 00 84 02 <48> 8b 91 90 10 00 00 48 8b 99 88 10 00 00 48 8b b1 a0 10 00 00 48 [ 45.026073][ C0] RSP: 002b:000000c4203cba80 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 45.034511][ C0] RAX: 0000000000000081 RBX: 000000c4201ec000 RCX: 000000c4201ec000 [ 45.042473][ C0] RDX: 000000c4201ed088 RSI: 000000000000000f RDI: 0000000000000081 [ 45.050467][ C0] RBP: 000000c4203cbb18 R08: 0000000000000814 R09: 000000000000054a [ 45.058420][ C0] R10: 00000000ffffffff R11: 0000000000003d09 R12: 0000000000000007 [ 45.066368][ C0] R13: 000000c42007e170 R14: 0000000000000004 R15: ffffffffffffffff [ 45.075847][ C0] Kernel Offset: disabled [ 45.080173][ C0] Rebooting in 86400 seconds..