[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 36.858236][ T25] audit: type=1800 audit(1571129884.614:25): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 36.903035][ T25] audit: type=1800 audit(1571129884.614:26): pid=7081 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 36.930887][ T25] audit: type=1800 audit(1571129884.614:27): pid=7081 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 '10.128.15.219' (ECDSA) to the list of known hosts. 2019/10/15 08:58:15 fuzzer started 2019/10/15 08:58:16 dialing manager at 10.128.0.105:33683 2019/10/15 08:58:16 syscalls: 2523 2019/10/15 08:58:16 code coverage: enabled 2019/10/15 08:58:16 comparison tracing: enabled 2019/10/15 08:58:16 extra coverage: extra coverage is not supported by the kernel 2019/10/15 08:58:16 setuid sandbox: enabled 2019/10/15 08:58:16 namespace sandbox: enabled 2019/10/15 08:58:16 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 08:58:16 fault injection: enabled 2019/10/15 08:58:16 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 08:58:16 net packet injection: enabled 2019/10/15 08:58:16 net device setup: enabled 2019/10/15 08:58:16 concurrency sanitizer: enabled syzkaller login: [ 48.967012][ C1] ================================================================== [ 48.975145][ C1] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 48.983188][ C1] [ 48.985505][ C1] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 48.993117][ C1] tick_sched_do_timer+0xc0/0xe0 [ 48.998037][ C1] tick_sched_timer+0x43/0xe0 [ 49.002707][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.007895][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.012833][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.018276][ C1] apic_timer_interrupt+0xf/0x20 [ 49.023200][ C1] __kcsan_check_watchpoint+0xa0/0x180 [ 49.028642][ C1] __tsan_read8+0x15/0x30 [ 49.032959][ C1] __handle_mm_fault+0xb0f/0x2d00 [ 49.037965][ C1] handle_mm_fault+0x21b/0x520 [ 49.042713][ C1] __do_page_fault+0x3fb/0x9e0 [ 49.047459][ C1] do_page_fault+0x54/0x233 [ 49.051940][ C1] page_fault+0x34/0x40 [ 49.056070][ C1] [ 49.058401][ C1] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 49.065925][ C1] tick_sched_do_timer+0x33/0xe0 [ 49.070847][ C1] tick_sched_timer+0x43/0xe0 [ 49.075517][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.080699][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.085625][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.091067][ C1] apic_timer_interrupt+0xf/0x20 [ 49.095978][ C1] [ 49.098292][ C1] Reported by Kernel Concurrency Sanitizer on: [ 49.104433][ C1] CPU: 1 PID: 7236 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.111519][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.121555][ C1] ================================================================== [ 49.129593][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 49.136163][ C1] CPU: 1 PID: 7236 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 49.143245][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 49.153278][ C1] Call Trace: [ 49.156543][ C1] [ 49.159386][ C1] dump_stack+0xf5/0x159 [ 49.163625][ C1] panic+0x209/0x639 [ 49.167505][ C1] ? vprintk_func+0x8d/0x140 [ 49.172085][ C1] kcsan_report.cold+0xc/0x1b [ 49.176750][ C1] __kcsan_setup_watchpoint+0x3ee/0x510 [ 49.182288][ C1] __tsan_read4+0x2c/0x30 [ 49.186603][ C1] tick_sched_do_timer+0x33/0xe0 [ 49.191528][ C1] tick_sched_timer+0x43/0xe0 [ 49.196192][ C1] __hrtimer_run_queues+0x288/0x600 [ 49.201375][ C1] ? tick_sched_do_timer+0xe0/0xe0 [ 49.206477][ C1] hrtimer_interrupt+0x22a/0x480 [ 49.211406][ C1] smp_apic_timer_interrupt+0xdc/0x280 [ 49.216942][ C1] ? smp_call_function_single_interrupt+0x80/0x1c0 [ 49.223432][ C1] apic_timer_interrupt+0xf/0x20 [ 49.228350][ C1] [ 49.231274][ C1] RIP: 0033:0x411e4b [ 49.235171][ C1] Code: 29 c2 48 c1 ea 0d 48 8b 35 22 92 3f 01 48 8b 3d 13 92 3f 01 48 39 f2 0f 83 d7 03 00 00 48 8b 34 d7 48 85 f6 74 10 48 8b 7e 18 <48> 39 fb 0f 83 a9 02 00 00 48 85 f6 74 08 0f b6 46 64 3c 02 75 3b [ 49.254771][ C1] RSP: 002b:000000c42014be38 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff13 [ 49.263171][ C1] RAX: 000000c420000000 RBX: 000000c4202d9c00 RCX: 000000c420001380 [ 49.271129][ C1] RDX: 000000000000016c RSI: 00007f4dc6c84c28 RDI: 000000c4202d8000 [ 49.279101][ C1] RBP: 000000c42014be80 R08: 0000000000000000 R09: 000000000001fc00 [ 49.287058][ C1] R10: 0000000000003000 R11: 000000c4202d9c00 R12: 000000c4205f6000 [ 49.295015][ C1] R13: 0000000000000029 R14: 0000000000000000 R15: 0000000000000000 [ 49.304136][ C1] Kernel Offset: disabled [ 49.308498][ C1] Rebooting in 86400 seconds..