[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 38.839919][ T25] audit: type=1800 audit(1571221310.254:25): pid=7077 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 38.886091][ T25] audit: type=1800 audit(1571221310.254:26): pid=7077 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 38.908108][ T25] audit: type=1800 audit(1571221310.254:27): pid=7077 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 '10.128.0.207' (ECDSA) to the list of known hosts. 2019/10/16 10:22:01 fuzzer started 2019/10/16 10:22:03 dialing manager at 10.128.0.105:34737 2019/10/16 10:22:03 syscalls: 2524 2019/10/16 10:22:03 code coverage: enabled 2019/10/16 10:22:03 comparison tracing: enabled 2019/10/16 10:22:03 extra coverage: extra coverage is not supported by the kernel 2019/10/16 10:22:03 setuid sandbox: enabled 2019/10/16 10:22:03 namespace sandbox: enabled 2019/10/16 10:22:03 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 10:22:03 fault injection: enabled 2019/10/16 10:22:03 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 10:22:03 net packet injection: enabled 2019/10/16 10:22:03 net device setup: enabled 2019/10/16 10:22:03 concurrency sanitizer: enabled syzkaller login: [ 52.162150][ C0] ================================================================== [ 52.170278][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 52.179189][ C0] [ 52.181521][ C0] write to 0xffffffff86042008 of 8 bytes by task 0 on cpu 1: [ 52.188888][ C0] tick_do_update_jiffies64+0x105/0x260 [ 52.194422][ C0] tick_irq_enter+0x139/0x1c0 [ 52.199323][ C0] irq_enter+0x4f/0x60 [ 52.203403][ C0] smp_apic_timer_interrupt+0x55/0x280 [ 52.208931][ C0] apic_timer_interrupt+0xf/0x20 [ 52.214113][ C0] native_safe_halt+0xe/0x10 [ 52.218690][ C0] arch_cpu_idle+0x1f/0x30 [ 52.223107][ C0] default_idle_call+0x1e/0x40 [ 52.227854][ C0] do_idle+0x1af/0x280 [ 52.231899][ C0] cpu_startup_entry+0x1b/0x20 [ 52.236649][ C0] start_secondary+0x208/0x260 [ 52.241390][ C0] secondary_startup_64+0xa4/0xb0 [ 52.247081][ C0] [ 52.249399][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 52.256935][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 52.262456][ C0] tick_sched_do_timer+0xd4/0xe0 [ 52.267382][ C0] tick_sched_timer+0x43/0xe0 [ 52.272082][ C0] __hrtimer_run_queues+0x288/0x600 [ 52.277281][ C0] hrtimer_interrupt+0x22a/0x480 [ 52.282212][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 52.287652][ C0] apic_timer_interrupt+0xf/0x20 [ 52.295771][ C0] [ 52.298084][ C0] Reported by Kernel Concurrency Sanitizer on: [ 52.304233][ C0] CPU: 0 PID: 7246 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.311661][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.321692][ C0] ================================================================== [ 52.329728][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 52.336294][ C0] CPU: 0 PID: 7246 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 52.343731][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.353766][ C0] Call Trace: [ 52.357036][ C0] [ 52.359873][ C0] dump_stack+0xf5/0x159 [ 52.364094][ C0] panic+0x210/0x640 [ 52.368142][ C0] ? vprintk_func+0x8d/0x140 [ 52.372711][ C0] kcsan_report.cold+0xc/0x1b [ 52.377367][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 52.382897][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 52.388598][ C0] __tsan_read8+0x2c/0x30 [ 52.392908][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 52.398346][ C0] tick_sched_do_timer+0xd4/0xe0 [ 52.403275][ C0] tick_sched_timer+0x43/0xe0 [ 52.407928][ C0] __hrtimer_run_queues+0x288/0x600 [ 52.413114][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 52.418206][ C0] hrtimer_interrupt+0x22a/0x480 [ 52.423128][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 52.428564][ C0] ? do_IRQ+0xcb/0x180 [ 52.432610][ C0] apic_timer_interrupt+0xf/0x20 [ 52.437702][ C0] [ 52.440710][ C0] RIP: 0033:0x409df9 [ 52.444935][ C0] Code: f6 c1 04 0f 85 46 01 00 00 0f b6 48 09 84 c9 0f 85 86 00 00 00 48 8b 40 10 eb 58 48 ff c2 48 83 c1 04 48 83 fa 08 73 38 8b 19 <8b> 74 24 38 39 f3 75 e9 0f b6 1c 02 84 db 74 e1 48 8b 4c 24 28 0f [ 52.464516][ C0] RSP: 002b:000000c4203c5810 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 [ 52.472909][ C0] RAX: 000000c4206df2c0 RBX: 000000008938ae4e RCX: 000000c4206df2c8 [ 52.480864][ C0] RDX: 0000000000000000 RSI: 0000000000862040 RDI: 0000000000000038 [ 52.488813][ C0] RBP: 000000c4203c5828 R08: 000000c42066e000 R09: 000000c4207191fc [ 52.496782][ C0] R10: 000000c4207191e0 R11: 0000000000000005 R12: 0000000000000002 [ 52.504729][ C0] R13: ffffffffffffffff R14: 0000000000000005 R15: 0000000000000001 [ 52.514068][ C0] Kernel Offset: disabled [ 52.518404][ C0] Rebooting in 86400 seconds..