[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.819264][ T23] audit: type=1800 audit(1571105074.952:25): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.839031][ T23] audit: type=1800 audit(1571105074.952:26): pid=7042 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.858978][ T23] audit: type=1800 audit(1571105074.952:27): pid=7042 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 '10.128.0.217' (ECDSA) to the list of known hosts. 2019/10/15 02:04:43 fuzzer started 2019/10/15 02:04:45 dialing manager at 10.128.0.105:33683 2019/10/15 02:04:45 syscalls: 2523 2019/10/15 02:04:45 code coverage: enabled 2019/10/15 02:04:45 comparison tracing: enabled 2019/10/15 02:04:45 extra coverage: extra coverage is not supported by the kernel 2019/10/15 02:04:45 setuid sandbox: enabled 2019/10/15 02:04:45 namespace sandbox: enabled 2019/10/15 02:04:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 02:04:45 fault injection: enabled 2019/10/15 02:04:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 02:04:45 net packet injection: enabled 2019/10/15 02:04:45 net device setup: enabled 2019/10/15 02:04:45 concurrency sanitizer: enabled syzkaller login: [ 46.677087][ C0] ================================================================== [ 46.685224][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 46.693265][ C0] [ 46.695579][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 46.703213][ C0] tick_sched_do_timer+0xc0/0xe0 [ 46.708138][ C0] tick_sched_timer+0x43/0xe0 [ 46.712802][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.717988][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.722909][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.728350][ C0] apic_timer_interrupt+0xf/0x20 [ 46.733263][ C0] [ 46.735579][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 46.743106][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.748026][ C0] tick_sched_timer+0x43/0xe0 [ 46.752687][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.757887][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.762822][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.768262][ C0] apic_timer_interrupt+0xf/0x20 [ 46.773174][ C0] [ 46.775487][ C0] Reported by Kernel Concurrency Sanitizer on: [ 46.781624][ C0] CPU: 0 PID: 7199 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.788726][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.798761][ C0] ================================================================== [ 46.806817][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.813393][ C0] CPU: 0 PID: 7199 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.820481][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.830517][ C0] Call Trace: [ 46.833782][ C0] [ 46.836623][ C0] dump_stack+0xf5/0x159 [ 46.840852][ C0] panic+0x209/0x639 [ 46.844736][ C0] ? vprintk_func+0x8d/0x140 [ 46.849319][ C0] kcsan_report.cold+0xc/0x1b [ 46.853984][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.859516][ C0] __tsan_read4+0x2c/0x30 [ 46.863830][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.868754][ C0] tick_sched_timer+0x43/0xe0 [ 46.873421][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.878609][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.883712][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.888653][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.894113][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 46.899820][ C0] apic_timer_interrupt+0xf/0x20 [ 46.904773][ C0] [ 46.907698][ C0] RIP: 0033:0x41d197 [ 46.911582][ C0] 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 [ 46.931256][ C0] RSP: 002b:000000c42004de10 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 46.939846][ C0] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420500000 [ 46.947817][ C0] RDX: 0000000000000005 RSI: 000000000002b320 RDI: 00007f04cf9e1000 [ 46.955773][ C0] RBP: 000000c42004de78 R08: 0000000000000004 R09: 0000000001223520 [ 46.963740][ C0] R10: 00000000008a414d R11: 0000000000000246 R12: 0000000000000010 [ 46.971696][ C0] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 46.981108][ C0] Kernel Offset: disabled [ 46.985430][ C0] Rebooting in 86400 seconds..