[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.562079][ T25] audit: type=1800 audit(1571689595.087:25): pid=7007 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.589174][ T25] audit: type=1800 audit(1571689595.087:26): pid=7007 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.628779][ T25] audit: type=1800 audit(1571689595.087:27): pid=7007 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 '10.128.0.210' (ECDSA) to the list of known hosts. 2019/10/21 20:26:43 fuzzer started 2019/10/21 20:26:44 dialing manager at 10.128.0.105:39747 2019/10/21 20:26:44 syscalls: 2524 2019/10/21 20:26:44 code coverage: enabled 2019/10/21 20:26:44 comparison tracing: enabled 2019/10/21 20:26:44 extra coverage: extra coverage is not supported by the kernel 2019/10/21 20:26:44 setuid sandbox: enabled 2019/10/21 20:26:44 namespace sandbox: enabled 2019/10/21 20:26:44 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 20:26:44 fault injection: enabled 2019/10/21 20:26:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 20:26:44 net packet injection: enabled 2019/10/21 20:26:44 net device setup: enabled 2019/10/21 20:26:44 concurrency sanitizer: enabled syzkaller login: [ 44.127119][ C1] ================================================================== [ 44.135261][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 44.143309][ C1] [ 44.145646][ C1] read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0: [ 44.153174][ C1] tick_sched_do_timer+0x33/0xe0 [ 44.158097][ C1] tick_sched_timer+0x43/0xe0 [ 44.162756][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.167937][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.172859][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.178413][ C1] apic_timer_interrupt+0xf/0x20 [ 44.183323][ C1] [ 44.185636][ C1] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 44.193251][ C1] tick_sched_do_timer+0xc0/0xe0 [ 44.198171][ C1] tick_sched_timer+0x43/0xe0 [ 44.202839][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.208031][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.212953][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.218396][ C1] apic_timer_interrupt+0xf/0x20 [ 44.223306][ C1] [ 44.225618][ C1] Reported by Kernel Concurrency Sanitizer on: [ 44.231758][ C1] CPU: 1 PID: 7158 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.239194][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.249253][ C1] ================================================================== [ 44.257294][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 44.263868][ C1] CPU: 1 PID: 7158 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 44.271302][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.281337][ C1] Call Trace: [ 44.284607][ C1] [ 44.287451][ C1] dump_stack+0xf5/0x159 [ 44.291678][ C1] panic+0x210/0x640 [ 44.295559][ C1] ? vprintk_func+0x8d/0x140 [ 44.300136][ C1] kcsan_report.cold+0xc/0x10 [ 44.304799][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 44.310333][ C1] __tsan_write4+0x32/0x40 [ 44.314734][ C1] tick_sched_do_timer+0xc0/0xe0 [ 44.319661][ C1] tick_sched_timer+0x43/0xe0 [ 44.324325][ C1] __hrtimer_run_queues+0x288/0x600 [ 44.329511][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 44.334613][ C1] hrtimer_interrupt+0x22a/0x480 [ 44.339542][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 44.344987][ C1] ? smp_reschedule_interrupt+0x71/0x1d0 [ 44.350617][ C1] apic_timer_interrupt+0xf/0x20 [ 44.355531][ C1] [ 44.358451][ C1] RIP: 0033:0x41d197 [ 44.362335][ C1] Code: 08 49 83 f8 08 0f 8d e7 00 00 00 48 39 de 0f 83 de 00 00 00 0f ba e2 00 0f 83 ca 00 00 00 4c 8b 4c 24 78 4e 8d 14 0e 4d 8b 12 <4d> 85 d2 74 c9 4c 39 d0 77 c4 49 39 ca 73 bf 4c 89 44 24 48 48 89 [ 44.381919][ C1] RSP: 002b:000000c42004de10 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 [ 44.390313][ C1] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420600000 [ 44.398270][ C1] RDX: 0000000000000005 RSI: 0000000000000dc0 RDI: 00007f6fb9369000 [ 44.406226][ C1] RBP: 000000c42004de78 R08: 0000000000000000 R09: 00000000013e4f80 [ 44.414194][ C1] R10: 00000000008a354e R11: 000000c42004dfc0 R12: 0000000000000280 [ 44.422148][ C1] R13: 000000000000006f R14: 00007f6fb939a6c8 R15: 0000000000000020 [ 44.431370][ C1] Kernel Offset: disabled [ 44.435692][ C1] Rebooting in 86400 seconds..