[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.252361][ T26] audit: type=1800 audit(1571772228.849:25): pid=6878 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.288709][ T26] audit: type=1800 audit(1571772228.849:26): pid=6878 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.324982][ T26] audit: type=1800 audit(1571772228.849:27): pid=6878 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 '10.128.0.156' (ECDSA) to the list of known hosts. 2019/10/22 19:23:58 fuzzer started 2019/10/22 19:24:00 dialing manager at 10.128.0.105:33369 2019/10/22 19:24:00 syscalls: 2524 2019/10/22 19:24:00 code coverage: enabled 2019/10/22 19:24:00 comparison tracing: enabled 2019/10/22 19:24:00 extra coverage: extra coverage is not supported by the kernel 2019/10/22 19:24:00 setuid sandbox: enabled 2019/10/22 19:24:00 namespace sandbox: enabled 2019/10/22 19:24:00 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/22 19:24:00 fault injection: enabled 2019/10/22 19:24:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/22 19:24:00 net packet injection: enabled 2019/10/22 19:24:00 net device setup: enabled 2019/10/22 19:24:00 concurrency sanitizer: enabled syzkaller login: [ 46.609451][ C0] ================================================================== [ 46.617737][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 46.625792][ C0] [ 46.628124][ C0] read to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 1: [ 46.635739][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.640769][ C0] tick_sched_timer+0x43/0xe0 [ 46.645477][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.650672][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.655615][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.661067][ C0] apic_timer_interrupt+0xf/0x20 [ 46.666001][ C0] _raw_spin_unlock_irqrestore+0x51/0x80 [ 46.671629][ C0] pagevec_lru_move_fn+0x13e/0x180 [ 46.676731][ C0] __lru_cache_add+0x120/0x1d0 [ 46.683577][ C0] lru_cache_add_active_or_unevictable+0xb6/0x1f0 [ 46.690329][ C0] __handle_mm_fault+0x1a40/0x2cb0 [ 46.695436][ C0] handle_mm_fault+0x21b/0x530 [ 46.700196][ C0] __do_page_fault+0x3fb/0x9e0 [ 46.705050][ C0] do_page_fault+0x54/0x233 [ 46.709541][ C0] [ 46.711866][ C0] write to 0xffffffff85cb2790 of 4 bytes by interrupt on cpu 0: [ 46.719497][ C0] tick_sched_do_timer+0xc0/0xe0 [ 46.724428][ C0] tick_sched_timer+0x43/0xe0 [ 46.729106][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.734485][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.739429][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.744973][ C0] apic_timer_interrupt+0xf/0x20 [ 46.749901][ C0] [ 46.752221][ C0] Reported by Kernel Concurrency Sanitizer on: [ 46.758508][ C0] CPU: 0 PID: 7031 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.765959][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.776186][ C0] ================================================================== [ 46.784266][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.790853][ C0] CPU: 0 PID: 7031 Comm: syz-fuzzer Not tainted 5.4.0-rc3+ #0 [ 46.798300][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.808349][ C0] Call Trace: [ 46.811671][ C0] [ 46.814526][ C0] dump_stack+0xf5/0x159 [ 46.818781][ C0] panic+0x210/0x640 [ 46.822700][ C0] ? vprintk_func+0x8d/0x140 [ 46.827288][ C0] kcsan_report.cold+0xc/0x10 [ 46.832131][ C0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 46.837684][ C0] __tsan_write4+0x32/0x40 [ 46.842192][ C0] tick_sched_do_timer+0xc0/0xe0 [ 46.847131][ C0] tick_sched_timer+0x43/0xe0 [ 46.851815][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.857138][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.862255][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.867203][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.872657][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 46.878290][ C0] apic_timer_interrupt+0xf/0x20 [ 46.883225][ C0] [ 46.886166][ C0] RIP: 0033:0x41d18b [ 46.890097][ C0] Code: 31 c0 eb 09 49 ff c0 d1 ea 48 83 c6 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 [ 46.909700][ C0] RSP: 002b:000000c42004de10 EFLAGS: 00000287 ORIG_RAX: ffffffffffffff13 [ 46.918228][ C0] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420600000 [ 46.926194][ C0] RDX: 000000000000000f RSI: 0000000000031fa0 RDI: 00007f0057696000 [ 46.934247][ C0] RBP: 000000c42004de78 R08: 0000000000000004 R09: 0000000000c64f80 [ 46.943371][ C0] R10: 00000000008b4402 R11: 0000000000000246 R12: 0000000000000004 [ 46.951429][ C0] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.960064][ C0] Kernel Offset: disabled [ 46.964458][ C0] Rebooting in 86400 seconds..