[ 42.560098][ T25] audit: type=1800 audit(1571021967.256:22): pid=7018 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [ 42.589464][ T25] audit: type=1800 audit(1571021967.256:23): pid=7018 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="rsyslog" dev="sda1" ino=2475 res=0 [ 42.616714][ T25] audit: type=1800 audit(1571021967.266:24): pid=7018 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="sudo" dev="sda1" ino=2487 res=0 [....] 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. Debian GNU/Linux 7 syzkaller ttyS0 Warning: Permanently added '10.128.1.2' (ECDSA) to the list of known hosts. 2019/10/14 02:59:37 fuzzer started 2019/10/14 02:59:38 dialing manager at 10.128.0.105:40973 2019/10/14 02:59:38 syscalls: 2523 2019/10/14 02:59:38 code coverage: enabled 2019/10/14 02:59:38 comparison tracing: enabled 2019/10/14 02:59:38 extra coverage: extra coverage is not supported by the kernel 2019/10/14 02:59:38 setuid sandbox: enabled 2019/10/14 02:59:38 namespace sandbox: enabled 2019/10/14 02:59:38 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/14 02:59:38 fault injection: enabled 2019/10/14 02:59:38 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/14 02:59:38 net packet injection: enabled 2019/10/14 02:59:38 net device setup: enabled 2019/10/14 02:59:38 concurrency sanitizer: enabled syzkaller login: [ 54.820120][ C0] ================================================================== [ 54.828400][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 54.837301][ C0] [ 54.839624][ C0] write to 0xffffffff8603f008 of 8 bytes by task 0 on cpu 1: [ 54.846968][ C0] tick_do_update_jiffies64+0x105/0x260 [ 54.852489][ C0] tick_irq_enter+0x139/0x1c0 [ 54.857142][ C0] irq_enter+0x4f/0x60 [ 54.861212][ C0] smp_apic_timer_interrupt+0x55/0x280 [ 54.867252][ C0] apic_timer_interrupt+0xf/0x20 [ 54.872168][ C0] native_safe_halt+0xe/0x10 [ 54.876734][ C0] arch_cpu_idle+0x1f/0x30 [ 54.881126][ C0] default_idle_call+0x1e/0x40 [ 54.885863][ C0] do_idle+0x1ea/0x2c0 [ 54.889906][ C0] cpu_startup_entry+0x1b/0x20 [ 54.894658][ C0] start_secondary+0x207/0x260 [ 54.899410][ C0] secondary_startup_64+0xa4/0xb0 [ 54.904401][ C0] [ 54.906705][ C0] read to 0xffffffff8603f008 of 8 bytes by interrupt on cpu 0: [ 54.914220][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 54.919651][ C0] tick_sched_do_timer+0xd4/0xe0 [ 54.924591][ C0] tick_sched_timer+0x43/0xe0 [ 54.929244][ C0] __hrtimer_run_queues+0x288/0x600 [ 54.934415][ C0] hrtimer_interrupt+0x22a/0x480 [ 54.939331][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 54.944762][ C0] apic_timer_interrupt+0xf/0x20 [ 54.949665][ C0] [ 54.951967][ C0] Reported by Kernel Concurrency Sanitizer on: [ 54.958098][ C0] CPU: 0 PID: 7172 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.965176][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.975205][ C0] ================================================================== [ 54.983336][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 54.989895][ C0] CPU: 0 PID: 7172 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 54.996972][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.007008][ C0] Call Trace: [ 55.010276][ C0] [ 55.013109][ C0] dump_stack+0xf5/0x159 [ 55.017331][ C0] panic+0x209/0x639 [ 55.021339][ C0] ? vprintk_func+0x8d/0x140 [ 55.025927][ C0] kcsan_report.cold+0xc/0x1b [ 55.030612][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 55.036183][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 55.041820][ C0] __tsan_read8+0x2c/0x30 [ 55.046131][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 55.051578][ C0] tick_sched_do_timer+0xd4/0xe0 [ 55.056494][ C0] tick_sched_timer+0x43/0xe0 [ 55.061151][ C0] __hrtimer_run_queues+0x288/0x600 [ 55.066324][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 55.071418][ C0] hrtimer_interrupt+0x22a/0x480 [ 55.076339][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 55.081770][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 55.087376][ C0] apic_timer_interrupt+0xf/0x20 [ 55.092283][ C0] [ 55.095197][ C0] RIP: 0033:0x40ac13 [ 55.099070][ C0] Code: 00 00 00 e9 dc 01 00 00 49 ff c1 49 83 f9 08 73 60 84 02 46 0f b6 14 0a 45 84 d2 75 0d 48 85 c9 75 e6 48 89 d1 4d 89 c8 eb de <49> 89 d2 4a 8d 54 8a 08 8b 12 44 8b 5c 24 58 44 39 da 74 05 4c 89 [ 55.118650][ C0] RSP: 002b:000000c4202ef7f0 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 [ 55.127034][ C0] RAX: fd6706824bc488e9 RBX: 000000c42013dfb0 RCX: 0000000000000000 [ 55.134986][ C0] RDX: 000000c4206c1dc0 RSI: 00000000008630e0 RDI: 0000000000000038 [ 55.142942][ C0] RBP: 000000c4202ef828 R08: 0000000000000000 R09: 0000000000000002 [ 55.150889][ C0] R10: 000000000000002c R11: 000000002de33ee6 R12: 0000000000000000 [ 55.158838][ C0] R13: ffffffffffffffff R14: 0000000000000004 R15: 0000000000000001 [ 55.168239][ C0] Kernel Offset: disabled [ 55.172993][ C0] Rebooting in 86400 seconds..