[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.697673][ T26] audit: type=1800 audit(1572561609.732:25): pid=7163 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.738185][ T26] audit: type=1800 audit(1572561609.732:26): pid=7163 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.770264][ T26] audit: type=1800 audit(1572561609.742:27): pid=7163 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 '10.128.0.215' (ECDSA) to the list of known hosts. 2019/10/31 22:40:21 fuzzer started 2019/10/31 22:40:23 dialing manager at 10.128.0.105:37477 2019/10/31 22:40:23 syscalls: 2540 2019/10/31 22:40:23 code coverage: enabled 2019/10/31 22:40:23 comparison tracing: enabled 2019/10/31 22:40:23 extra coverage: extra coverage is not supported by the kernel 2019/10/31 22:40:23 setuid sandbox: enabled 2019/10/31 22:40:23 namespace sandbox: enabled 2019/10/31 22:40:23 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/31 22:40:23 fault injection: enabled 2019/10/31 22:40:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/31 22:40:23 net packet injection: enabled 2019/10/31 22:40:23 net device setup: enabled 2019/10/31 22:40:23 concurrency sanitizer: enabled syzkaller login: [ 62.699059][ T7329] KCSAN: could not find function: 'kcm_abort_tx_psock' [ 63.250641][ T0] ================================================================== [ 63.258786][ T0] BUG: KCSAN: data-race in add_timer_on / timer_clear_idle [ 63.265965][ T0] [ 63.268286][ T0] read to 0xffff88812be1b6e4 of 1 bytes by interrupt on cpu 1: [ 63.275820][ T0] add_timer_on+0x20e/0x2d0 [ 63.280306][ T0] clocksource_watchdog+0x63f/0x760 [ 63.285495][ T0] call_timer_fn+0x5f/0x2f0 [ 63.290002][ T0] run_timer_softirq+0xcb8/0xd20 [ 63.294931][ T0] __do_softirq+0x115/0x33f [ 63.299427][ T0] irq_exit+0xbb/0xe0 [ 63.303400][ T0] smp_apic_timer_interrupt+0xe6/0x280 [ 63.308843][ T0] apic_timer_interrupt+0xf/0x20 [ 63.313770][ T0] _raw_spin_unlock_irqrestore+0x51/0x80 [ 63.319401][ T0] debugfs_write+0x192/0x2a0 [ 63.323990][ T0] full_proxy_write+0xbd/0x100 [ 63.328750][ T0] __vfs_write+0x67/0xc0 [ 63.333074][ T0] vfs_write+0x18a/0x390 [ 63.337302][ T0] ksys_write+0xd5/0x1b0 [ 63.341517][ T0] [ 63.343838][ T0] write to 0xffff88812be1b6e4 of 1 bytes by task 0 on cpu 0: [ 63.351207][ T0] timer_clear_idle+0x42/0x50 [ 63.355880][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 63.361762][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 63.366884][ T0] do_idle+0xb1/0x280 [ 63.370854][ T0] cpu_startup_entry+0x1b/0x20 [ 63.375605][ T0] rest_init+0xec/0xf6 [ 63.379660][ T0] arch_call_rest_init+0x17/0x37 [ 63.384591][ T0] start_kernel+0x838/0x85e [ 63.389088][ T0] x86_64_start_reservations+0x29/0x2b [ 63.394537][ T0] x86_64_start_kernel+0x72/0x76 [ 63.399471][ T0] secondary_startup_64+0xa4/0xb0 [ 63.404472][ T0] [ 63.406784][ T0] Reported by Kernel Concurrency Sanitizer on: [ 63.412929][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 63.420019][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.430057][ T0] ================================================================== [ 63.438103][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 63.444684][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.4.0-rc3+ #0 [ 63.451777][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.461818][ T0] Call Trace: [ 63.465111][ T0] dump_stack+0xf5/0x159 [ 63.469345][ T0] panic+0x210/0x640 [ 63.473227][ T0] ? x86_64_start_reservations+0x29/0x2b [ 63.478847][ T0] ? vprintk_func+0x8d/0x140 [ 63.483427][ T0] kcsan_report.cold+0xc/0x10 [ 63.488100][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 63.493630][ T0] __tsan_write1+0x32/0x40 [ 63.498035][ T0] timer_clear_idle+0x42/0x50 [ 63.502709][ T0] __tick_nohz_idle_restart_tick+0x36/0x1b0 [ 63.508686][ T0] tick_nohz_idle_exit+0x1af/0x1e0 [ 63.513788][ T0] do_idle+0xb1/0x280 [ 63.517762][ T0] cpu_startup_entry+0x1b/0x20 [ 63.522515][ T0] rest_init+0xec/0xf6 [ 63.526577][ T0] ? trace_event_define_fields_vector_free_moved+0xce/0xce [ 63.533785][ T0] arch_call_rest_init+0x17/0x37 [ 63.538721][ T0] start_kernel+0x838/0x85e [ 63.543230][ T0] x86_64_start_reservations+0x29/0x2b [ 63.548681][ T0] x86_64_start_kernel+0x72/0x76 [ 63.553609][ T0] secondary_startup_64+0xa4/0xb0 [ 63.584617][ T0] Kernel Offset: disabled [ 63.588938][ T0] Rebooting in 86400 seconds..