[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.571606][ T25] audit: type=1800 audit(1570877261.617:25): pid=7087 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.591557][ T25] audit: type=1800 audit(1570877261.617:26): pid=7087 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.613232][ T25] audit: type=1800 audit(1570877261.617:27): pid=7087 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 '10.128.15.218' (ECDSA) to the list of known hosts. 2019/10/12 10:47:50 fuzzer started 2019/10/12 10:47:51 dialing manager at 10.128.0.105:43913 2019/10/12 10:47:51 syscalls: 2523 2019/10/12 10:47:51 code coverage: enabled 2019/10/12 10:47:51 comparison tracing: enabled 2019/10/12 10:47:51 extra coverage: extra coverage is not supported by the kernel 2019/10/12 10:47:51 setuid sandbox: enabled 2019/10/12 10:47:51 namespace sandbox: enabled 2019/10/12 10:47:51 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/12 10:47:51 fault injection: enabled 2019/10/12 10:47:51 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/12 10:47:51 net packet injection: enabled 2019/10/12 10:47:51 net device setup: enabled 2019/10/12 10:47:51 concurrency sanitizer: enabled syzkaller login: [ 45.800692][ C1] ================================================================== [ 45.808846][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 45.818357][ C1] [ 45.820770][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 45.829034][ C1] tick_sched_do_timer+0xc0/0xe0 [ 45.834303][ C1] tick_sched_timer+0x43/0xe0 [ 45.838975][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.844196][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.849126][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.854566][ C1] apic_timer_interrupt+0xf/0x20 [ 45.859520][ C1] _raw_spin_unlock_irqrestore+0x51/0x80 [ 45.865388][ C1] __wake_up_common_lock+0x85/0xb0 [ 45.870493][ C1] __wake_up_sync_key+0x19/0x20 [ 45.875333][ C1] sock_def_readable+0xa9/0x140 [ 45.880334][ C1] tcp_data_ready+0x7d/0xd0 [ 45.885100][ C1] tcp_rcv_established+0xd0c/0xf50 [ 45.890252][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 45.894865][ C1] tcp_v4_rcv+0x1a03/0x1bf0 [ 45.899379][ C1] [ 45.901700][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 45.909314][ C1] tick_sched_do_timer+0x33/0xe0 [ 45.914339][ C1] tick_sched_timer+0x43/0xe0 [ 45.919055][ C1] __hrtimer_run_queues+0x288/0x600 [ 45.924523][ C1] hrtimer_interrupt+0x22a/0x480 [ 45.929563][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 45.935013][ C1] apic_timer_interrupt+0xf/0x20 [ 45.939928][ C1] [ 45.942261][ C1] Reported by Kernel Concurrency Sanitizer on: [ 45.948470][ C1] CPU: 1 PID: 7243 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.955638][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.966007][ C1] ================================================================== [ 45.974070][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 45.980725][ C1] CPU: 1 PID: 7243 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 45.987956][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.999053][ C1] Call Trace: [ 46.002555][ C1] [ 46.005627][ C1] dump_stack+0xf5/0x159 [ 46.009864][ C1] panic+0x209/0x639 [ 46.014092][ C1] ? vprintk_func+0x8d/0x140 [ 46.018937][ C1] kcsan_report.cold+0xc/0x1b [ 46.023729][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.029528][ C1] __tsan_read4+0x2c/0x30 [ 46.034530][ C1] tick_sched_do_timer+0x33/0xe0 [ 46.039781][ C1] tick_sched_timer+0x43/0xe0 [ 46.044822][ C1] __hrtimer_run_queues+0x288/0x600 [ 46.050016][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 46.055302][ C1] hrtimer_interrupt+0x22a/0x480 [ 46.060671][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 46.066352][ C1] apic_timer_interrupt+0xf/0x20 [ 46.071272][ C1] [ 46.074290][ C1] RIP: 0033:0x609973 [ 46.078224][ C1] Code: 8b 0d 01 8f 1f 01 48 8b 05 02 8f 1f 01 eb af 48 8b 44 24 28 48 8b 4c 24 20 eb a3 48 8b 44 24 40 48 ff 40 10 48 8b 48 20 d3 e2 <48> 83 f9 20 19 db 21 da 0b 50 18 89 50 18 48 83 40 20 08 0f 57 c0 [ 46.098304][ C1] RSP: 002b:000000c420564a38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 46.107076][ C1] RAX: 000000c4204a2000 RBX: 000000c4203e4000 RCX: 0000000000000008 [ 46.115337][ C1] RDX: 0000000000003b00 RSI: 0000000000000008 RDI: 0000000000000003 [ 46.123301][ C1] RBP: 000000c420564a68 R08: 000000c4204a8000 R09: 00000000000000bf [ 46.131738][ C1] R10: 00000000ffffffff R11: 0000000000002f63 R12: 0000000000000020 [ 46.140441][ C1] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 46.152692][ C1] Kernel Offset: disabled [ 46.157057][ C1] Rebooting in 86400 seconds..