[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.067659][ T26] audit: type=1800 audit(1571123313.883:25): pid=7050 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.087486][ T26] audit: type=1800 audit(1571123313.883:26): pid=7050 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.112997][ T26] audit: type=1800 audit(1571123313.883:27): pid=7050 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 '10.128.1.27' (ECDSA) to the list of known hosts. 2019/10/15 07:08:44 fuzzer started 2019/10/15 07:08:45 dialing manager at 10.128.0.105:33683 2019/10/15 07:08:45 syscalls: 2523 2019/10/15 07:08:45 code coverage: enabled 2019/10/15 07:08:45 comparison tracing: enabled 2019/10/15 07:08:45 extra coverage: extra coverage is not supported by the kernel 2019/10/15 07:08:45 setuid sandbox: enabled 2019/10/15 07:08:45 namespace sandbox: enabled 2019/10/15 07:08:45 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/15 07:08:45 fault injection: enabled 2019/10/15 07:08:45 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/15 07:08:45 net packet injection: enabled 2019/10/15 07:08:45 net device setup: enabled 2019/10/15 07:08:45 concurrency sanitizer: enabled syzkaller login: [ 46.042313][ C0] ================================================================== [ 46.050474][ C0] BUG: KCSAN: data-race in tick_sched_do_timer / tick_sched_do_timer [ 46.058517][ C0] [ 46.060860][ C0] write to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 1: [ 46.068479][ C0] tick_sched_do_timer+0xc0/0xe0 [ 46.073406][ C0] tick_sched_timer+0x43/0xe0 [ 46.078067][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.083252][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.088175][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.093619][ C0] apic_timer_interrupt+0xf/0x20 [ 46.098528][ C0] [ 46.100841][ C0] read to 0xffffffff85caf310 of 4 bytes by interrupt on cpu 0: [ 46.108384][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.113307][ C0] tick_sched_timer+0x43/0xe0 [ 46.117986][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.123168][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.128087][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.133549][ C0] apic_timer_interrupt+0xf/0x20 [ 46.138466][ C0] [ 46.140800][ C0] Reported by Kernel Concurrency Sanitizer on: [ 46.146943][ C0] CPU: 0 PID: 7216 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.154030][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.164064][ C0] ================================================================== [ 46.172112][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 46.178686][ C0] CPU: 0 PID: 7216 Comm: syz-fuzzer Not tainted 5.3.0+ #0 [ 46.185775][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 46.195810][ C0] Call Trace: [ 46.199075][ C0] [ 46.201922][ C0] dump_stack+0xf5/0x159 [ 46.206156][ C0] panic+0x209/0x639 [ 46.210044][ C0] ? vprintk_func+0x8d/0x140 [ 46.214621][ C0] kcsan_report.cold+0xc/0x1b [ 46.219287][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 46.224821][ C0] __tsan_read4+0x2c/0x30 [ 46.229139][ C0] tick_sched_do_timer+0x33/0xe0 [ 46.234064][ C0] tick_sched_timer+0x43/0xe0 [ 46.238732][ C0] __hrtimer_run_queues+0x288/0x600 [ 46.243919][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 46.249040][ C0] hrtimer_interrupt+0x22a/0x480 [ 46.253973][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 46.259437][ C0] ? smp_reschedule_interrupt+0x71/0x1d0 [ 46.265059][ C0] apic_timer_interrupt+0xf/0x20 [ 46.269978][ C0] [ 46.272902][ C0] RIP: 0033:0x41d197 [ 46.276787][ 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 [ 46.296490][ C0] RSP: 002b:000000c4203cbe10 EFLAGS: 00000283 ORIG_RAX: ffffffffffffff13 [ 46.304884][ C0] RAX: 000000c420000000 RBX: 0000000000040000 RCX: 000000c420630000 [ 46.312842][ C0] RDX: 0000000000000005 RSI: 0000000000013020 RDI: 00007ff297f20000 [ 46.320805][ C0] RBP: 000000c4203cbe78 R08: 0000000000000004 R09: 00000000011e3520 [ 46.328764][ C0] R10: 00000000008a414d R11: 000000c4203cbfc0 R12: 0000000000000000 [ 46.336723][ C0] R13: 00000000000000f6 R14: 0000000000000076 R15: 0000000000000080 [ 46.346043][ C0] Kernel Offset: disabled [ 46.350372][ C0] Rebooting in 86400 seconds..