[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[ 35.167888][ T26] audit: type=1800 audit(1570825575.815:25): pid=7029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0
[ 35.203166][ T26] audit: type=1800 audit(1570825575.815:26): pid=7029 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0
[ 35.234471][ T26] audit: type=1800 audit(1570825575.815:27): pid=7029 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.15.214' (ECDSA) to the list of known hosts.
2019/10/11 20:26:25 fuzzer started
2019/10/11 20:26:26 dialing manager at 10.128.0.105:43913
2019/10/11 20:26:26 syscalls: 2523
2019/10/11 20:26:26 code coverage: enabled
2019/10/11 20:26:26 comparison tracing: enabled
2019/10/11 20:26:26 extra coverage: extra coverage is not supported by the kernel
2019/10/11 20:26:26 setuid sandbox: enabled
2019/10/11 20:26:26 namespace sandbox: enabled
2019/10/11 20:26:26 Android sandbox: /sys/fs/selinux/policy does not exist
2019/10/11 20:26:26 fault injection: enabled
2019/10/11 20:26:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2019/10/11 20:26:26 net packet injection: enabled
2019/10/11 20:26:26 net device setup: enabled
2019/10/11 20:26:26 concurrency sanitizer: enabled
syzkaller login: [ 46.768823][ C0] ==================================================================
[ 46.776972][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer
[ 46.785014][ C0]
[ 46.787392][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1:
[ 46.795119][ C0] tick_sched_do_timer+0x33/0xe0
[ 46.800634][ C0] tick_sched_timer+0x43/0xe0
[ 46.805304][ C0] __hrtimer_run_queues+0x288/0x600
[ 46.810487][ C0] hrtimer_interrupt+0x22a/0x480
[ 46.815424][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 46.820861][ C0] apic_timer_interrupt+0xf/0x20
[ 46.825775][ C0] memset_erms+0x9/0x10
[ 46.829908][ C0] skb_clone+0xf9/0x280
[ 46.834041][ C0] packet_rcv_spkt+0x2e2/0x350
[ 46.838790][ C0] __netif_receive_skb_core+0xe13/0x1a90
[ 46.844936][ C0] __netif_receive_skb_one_core+0x67/0xe0
[ 46.850631][ C0] __netif_receive_skb+0x37/0xf0
[ 46.855546][ C0] netif_receive_skb_internal+0x59/0x190
[ 46.861162][ C0] napi_gro_receive+0x28f/0x330
[ 46.865984][ C0]
[ 46.868291][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0:
[ 46.876434][ C0] tick_sched_do_timer+0xc0/0xe0
[ 46.881350][ C0] tick_sched_timer+0x43/0xe0
[ 46.886021][ C0] __hrtimer_run_queues+0x288/0x600
[ 46.891198][ C0] hrtimer_interrupt+0x22a/0x480
[ 46.896115][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 46.901548][ C0] apic_timer_interrupt+0xf/0x20
[ 46.906462][ C0] _raw_spin_unlock_irq+0x4e/0x80
[ 46.911461][ C0] finish_task_switch+0x7b/0x260
[ 46.916388][ C0] __schedule+0x2ed/0x5d0
[ 46.920694][ C0] preempt_schedule_common+0x37/0x90
[ 46.925953][ C0] preempt_schedule+0x30/0x40
[ 46.930631][ C0] ___preempt_schedule+0x16/0x20
[ 46.935552][ C0] __local_bh_enable_ip+0x44/0x80
[ 46.940546][ C0]
[ 46.942846][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 46.948975][ C0] CPU: 0 PID: 7191 Comm: syz-fuzzer Not tainted 5.3.0+ #0
[ 46.956056][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 46.966082][ C0] ==================================================================
[ 46.974113][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 46.980677][ C0] CPU: 0 PID: 7191 Comm: syz-fuzzer Not tainted 5.3.0+ #0
[ 46.987756][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 46.997783][ C0] Call Trace:
[ 47.001045][ C0]
[ 47.003893][ C0] dump_stack+0xf5/0x159
[ 47.008132][ C0] panic+0x209/0x639
[ 47.012003][ C0] ? __schedule+0x2ed/0x5d0
[ 47.016483][ C0] ? vprintk_func+0x8d/0x140
[ 47.021052][ C0] kcsan_report.cold+0xc/0x1b
[ 47.025711][ C0] __kcsan_setup_watchpoint+0x3ee/0x510
[ 47.031251][ C0] __tsan_write4+0x32/0x40
[ 47.035650][ C0] tick_sched_do_timer+0xc0/0xe0
[ 47.040825][ C0] tick_sched_timer+0x43/0xe0
[ 47.045480][ C0] __hrtimer_run_queues+0x288/0x600
[ 47.050655][ C0] ? tick_sched_do_timer+0xe0/0xe0
[ 47.055747][ C0] hrtimer_interrupt+0x22a/0x480
[ 47.060665][ C0] smp_apic_timer_interrupt+0xdc/0x280
[ 47.066097][ C0] ? smp_reschedule_interrupt+0x71/0x1d0
[ 47.071727][ C0] apic_timer_interrupt+0xf/0x20
[ 47.076641][ C0]
[ 47.079560][ C0] RIP: 0010:_raw_spin_unlock_irq+0x4e/0x80
[ 47.085345][ C0] Code: 00 74 44 48 89 df c6 07 00 0f 1f 40 00 48 c7 c7 20 5a a5 85 e8 d3 34 bf fc 48 83 3d eb bb 11 01 00 74 26 fb 66 0f 1f 44 00 00 01 00 00 00 e8 68 72 a0 fc 65 8b 05 b9 cd 6d 7b 85 c0 74 0c e8
[ 47.104925][ C0] RSP: 0018:ffffc90001783980 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
[ 47.113311][ C0] RAX: f5c28f5c28f5f52f RBX: ffff88812be2ae40 RCX: 000000000000078a
[ 47.121261][ C0] RDX: 00000000002bea30 RSI: 020c49ba5e353f7d RDI: ffffffff85a55a20
[ 47.129209][ C0] RBP: ffffc90001783988 R08: 0000000000000000 R09: 0000ffff85a55a27
[ 47.137156][ C0] R10: 00000000aaaaaaab R11: ffffffff86042cc0 R12: ffff88812be2ae40
[ 47.145118][ C0] R13: ffff888126e9c040 R14: 0000000000000000 R15: 0000000000000001
[ 47.153093][ C0] finish_task_switch+0x7b/0x260
[ 47.158024][ C0] __schedule+0x2ed/0x5d0
[ 47.162330][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 47.167937][ C0] ? preempt_schedule+0x30/0x40
[ 47.172762][ C0] preempt_schedule_common+0x37/0x90
[ 47.178029][ C0] preempt_schedule+0x30/0x40
[ 47.182688][ C0] ___preempt_schedule+0x16/0x20
[ 47.187636][ C0] ? __this_cpu_preempt_check+0x45/0x170
[ 47.193245][ C0] __local_bh_enable_ip+0x44/0x80
[ 47.198246][ C0] lock_sock_nested+0x85/0xb0
[ 47.202902][ C0] tcp_recvmsg+0xac/0x1a30
[ 47.207297][ C0] ? __tsan_read8+0x2c/0x30
[ 47.211793][ C0] ? aa_sk_perm+0x1a4/0x450
[ 47.216271][ C0] ? __kcsan_setup_watchpoint+0x96/0x510
[ 47.221883][ C0] inet_recvmsg+0xbb/0x250
[ 47.226274][ C0] ? __tsan_read8+0x2c/0x30
[ 47.230754][ C0] ? inet_sendpage+0x100/0x100
[ 47.235493][ C0] sock_recvmsg+0x92/0xb0
[ 47.240059][ C0] sock_read_iter+0x15f/0x1e0
[ 47.244717][ C0] new_sync_read+0x389/0x4f0
[ 47.249290][ C0] __vfs_read+0xb1/0xc0
[ 47.253422][ C0] vfs_read+0x143/0x2c0
[ 47.257558][ C0] ksys_read+0xd5/0x1b0
[ 47.261698][ C0] __x64_sys_read+0x4c/0x60
[ 47.266179][ C0] do_syscall_64+0xcf/0x2f0
[ 47.270681][ C0] entry_SYSCALL_64_after_hwframe+0x44/0xa9
[ 47.276544][ C0] RIP: 0033:0x47c530
[ 47.280434][ C0] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30
[ 47.300066][ C0] RSP: 002b:000000c42032f7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000
[ 47.308468][ C0] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530
[ 47.316429][ C0] RDX: 0000000000001000 RSI: 000000c42015c000 RDI: 0000000000000003
[ 47.324378][ C0] RBP: 000000c42032f830 R08: 0000000000000000 R09: 0000000000000000
[ 47.332350][ C0] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000020
[ 47.340310][ C0] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff
[ 47.349631][ C0] Kernel Offset: disabled
[ 47.353950][ C0] Rebooting in 86400 seconds..