[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.755642][ T26] audit: type=1800 audit(1570697472.200:25): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.775362][ T26] audit: type=1800 audit(1570697472.200:26): pid=7052 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.797064][ T26] audit: type=1800 audit(1570697472.200:27): pid=7052 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 '10.128.0.57' (ECDSA) to the list of known hosts. 2019/10/10 08:51:21 fuzzer started 2019/10/10 08:51:22 dialing manager at 10.128.0.105:34287 2019/10/10 08:51:22 syscalls: 2523 2019/10/10 08:51:22 code coverage: enabled 2019/10/10 08:51:22 comparison tracing: enabled 2019/10/10 08:51:22 extra coverage: extra coverage is not supported by the kernel 2019/10/10 08:51:22 setuid sandbox: enabled 2019/10/10 08:51:22 namespace sandbox: enabled 2019/10/10 08:51:22 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/10 08:51:22 fault injection: enabled 2019/10/10 08:51:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/10 08:51:22 net packet injection: enabled 2019/10/10 08:51:22 net device setup: enabled 2019/10/10 08:51:22 concurrency sanitizer: enabled syzkaller login: [ 45.165410][ T0] ================================================================== [ 45.173656][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_nohz_next_event [ 45.182208][ T0] [ 45.184515][ T0] write to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 1: [ 45.191862][ T0] tick_nohz_idle_stop_tick+0x525/0x670 [ 45.197385][ T0] do_idle+0x1e0/0x2c0 [ 45.201431][ T0] cpu_startup_entry+0x1b/0x20 [ 45.206170][ T0] start_secondary+0x207/0x260 [ 45.210924][ T0] secondary_startup_64+0xa4/0xb0 [ 45.215940][ T0] [ 45.218269][ T0] read to 0xffffffff85caf310 of 4 bytes by task 0 on cpu 0: [ 45.225568][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.230760][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.236307][ T0] do_idle+0x1e0/0x2c0 [ 45.240384][ T0] cpu_startup_entry+0x1b/0x20 [ 45.245149][ T0] rest_init+0xec/0xf6 [ 45.249220][ T0] arch_call_rest_init+0x17/0x37 [ 45.254155][ T0] start_kernel+0x83e/0x864 [ 45.258739][ T0] x86_64_start_reservations+0x29/0x2b [ 45.264550][ T0] x86_64_start_kernel+0x72/0x76 [ 45.269471][ T0] secondary_startup_64+0xa4/0xb0 [ 45.274464][ T0] [ 45.276772][ T0] Reported by Kernel Concurrency Sanitizer on: [ 45.282917][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 45.289655][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.299726][ T0] ================================================================== [ 45.307767][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 45.314348][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.3.0+ #0 [ 45.321093][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 45.331125][ T0] Call Trace: [ 45.334402][ T0] dump_stack+0xf5/0x159 [ 45.338682][ T0] panic+0x209/0x639 [ 45.342609][ T0] ? x86_64_start_kernel+0x72/0x76 [ 45.347707][ T0] ? vprintk_func+0x8d/0x140 [ 45.352281][ T0] kcsan_report.cold+0xc/0x1b [ 45.356951][ T0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 45.362489][ T0] __tsan_read4+0x2c/0x30 [ 45.366830][ T0] tick_nohz_next_event+0x1a4/0x380 [ 45.372024][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 45.377586][ T0] ? __tsan_read4+0x2c/0x30 [ 45.382072][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 45.388305][ T0] do_idle+0x1e0/0x2c0 [ 45.392373][ T0] cpu_startup_entry+0x1b/0x20 [ 45.397220][ T0] rest_init+0xec/0xf6 [ 45.401293][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 45.408491][ T0] arch_call_rest_init+0x17/0x37 [ 45.413435][ T0] start_kernel+0x83e/0x864 [ 45.417948][ T0] x86_64_start_reservations+0x29/0x2b [ 45.423409][ T0] x86_64_start_kernel+0x72/0x76 [ 45.428347][ T0] secondary_startup_64+0xa4/0xb0 [ 45.434839][ T0] Kernel Offset: disabled [ 45.439160][ T0] Rebooting in 86400 seconds..