[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 37.276760][ T26] audit: type=1800 audit(1571335777.042:25): pid=7024 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 37.302949][ T26] audit: type=1800 audit(1571335777.042:26): pid=7024 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 37.323690][ T26] audit: type=1800 audit(1571335777.042:27): pid=7024 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 '10.128.10.40' (ECDSA) to the list of known hosts. 2019/10/17 18:09:47 fuzzer started 2019/10/17 18:09:48 dialing manager at 10.128.0.105:43535 2019/10/17 18:09:48 syscalls: 2524 2019/10/17 18:09:48 code coverage: enabled 2019/10/17 18:09:48 comparison tracing: enabled 2019/10/17 18:09:48 extra coverage: extra coverage is not supported by the kernel 2019/10/17 18:09:48 setuid sandbox: enabled 2019/10/17 18:09:48 namespace sandbox: enabled 2019/10/17 18:09:48 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 18:09:48 fault injection: enabled 2019/10/17 18:09:48 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 18:09:48 net packet injection: enabled 2019/10/17 18:09:48 net device setup: enabled 2019/10/17 18:09:48 concurrency sanitizer: enabled syzkaller login: [ 49.241694][ C1] ================================================================== [ 49.249843][ C1] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 49.258759][ C1] [ 49.261114][ C1] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 49.268732][ C1] tick_do_update_jiffies64+0x105/0x260 [ 49.274255][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.279170][ C1] tick_sched_timer+0x43/0xe0 [ 49.283823][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.288997][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.293959][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.299393][ C1] apic_timer_interrupt+0xf/0x20 [ 49.304308][ C1] __kcsan_check_watchpoint+0x87/0x180 [ 49.309761][ C1] __tsan_write8+0x18/0x40 [ 49.314160][ C1] __skb_clone+0x53/0x380 [ 49.318484][ C1] skb_clone+0x128/0x280 [ 49.322706][ C1] packet_rcv_spkt+0x2b9/0x310 [ 49.327447][ C1] __netif_receive_skb_core+0xe13/0x1a90 [ 49.333054][ C1] __netif_receive_skb_one_core+0x67/0xe0 [ 49.338740][ C1] [ 49.341046][ C1] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 49.348565][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 49.354000][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.358911][ C1] tick_sched_timer+0x43/0xe0 [ 49.363563][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.368751][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.373665][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.379100][ C1] apic_timer_interrupt+0xf/0x20 [ 49.384005][ C1] [ 49.386307][ C1] Reported by Kernel Concurrency Sanitizer on: [ 49.392436][ C1] CPU: 1 PID: 7176 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.399863][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.409902][ C1] ================================================================== [ 49.417945][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 49.424518][ C1] CPU: 1 PID: 7176 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 49.431951][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.442031][ C1] Call Trace: [ 49.445296][ C1] [ 49.448135][ C1] dump_stack+0xf5/0x159 [ 49.452355][ C1] panic+0x210/0x640 [ 49.456234][ C1] ? vprintk_func+0x8d/0x140 [ 49.460807][ C1] kcsan_report.cold+0xc/0x10 [ 49.465464][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 49.470988][ C1] ? __kcsan_setup_watchpoint+0x6b/0x4a0 [ 49.476622][ C1] __tsan_read8+0x2c/0x30 [ 49.480930][ C1] tick_do_update_jiffies64+0x2b/0x260 [ 49.486383][ C1] tick_sched_do_timer+0xd4/0xe0 [ 49.491298][ C1] tick_sched_timer+0x43/0xe0 [ 49.495954][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.501134][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 49.506233][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.511173][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.516630][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 49.522248][ C1] apic_timer_interrupt+0xf/0x20 [ 49.527167][ C1] [ 49.530098][ C1] RIP: 0033:0x609a2e [ 49.533999][ C1] Code: 48 8b 4c 24 08 48 85 c9 74 d0 48 c7 44 24 50 00 00 00 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 [ 49.553579][ C1] RSP: 002b:000000c4203cfa40 EFLAGS: 00000212 ORIG_RAX: ffffffffffffff13 [ 49.562063][ C1] RAX: 000000c4201e0028 RBX: 000000c4201e0000 RCX: 000000c420085380 [ 49.570021][ C1] RDX: 0000000000037996 RSI: 0000000000000012 RDI: 00000000000000fc [ 49.577978][ C1] RBP: 000000c4203cfa70 R08: 000000c4201e6000 R09: 0000000000037996 [ 49.585936][ C1] R10: 00000000ffffffff R11: 0000000000000ff7 R12: 0000000000000002 [ 49.593948][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 49.603227][ C1] Kernel Offset: disabled [ 49.607549][ C1] Rebooting in 86400 seconds..