[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 32.512054][ T25] audit: type=1800 audit(1571258372.734:25): pid=6991 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 32.538798][ T25] audit: type=1800 audit(1571258372.734:26): pid=6991 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 32.565375][ T25] audit: type=1800 audit(1571258372.734:27): pid=6991 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 '10.128.0.168' (ECDSA) to the list of known hosts. 2019/10/16 20:39:41 fuzzer started 2019/10/16 20:39:42 dialing manager at 10.128.0.105:33899 2019/10/16 20:39:42 syscalls: 2524 2019/10/16 20:39:42 code coverage: enabled 2019/10/16 20:39:42 comparison tracing: enabled 2019/10/16 20:39:42 extra coverage: extra coverage is not supported by the kernel 2019/10/16 20:39:42 setuid sandbox: enabled 2019/10/16 20:39:42 namespace sandbox: enabled 2019/10/16 20:39:42 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/16 20:39:42 fault injection: enabled 2019/10/16 20:39:42 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/16 20:39:42 net packet injection: enabled 2019/10/16 20:39:42 net device setup: enabled 2019/10/16 20:39:42 concurrency sanitizer: enabled syzkaller login: [ 43.249082][ C0] ================================================================== [ 43.257242][ C0] BUG: KCSAN: data-race in tick_do_update_jiffies64 / tick_do_update_jiffies64 [ 43.266179][ C0] [ 43.268483][ C0] write to 0xffffffff86042008 of 8 bytes by interrupt on cpu 1: [ 43.276086][ C0] tick_do_update_jiffies64+0x105/0x260 [ 43.281607][ C0] tick_sched_do_timer+0xd4/0xe0 [ 43.286516][ C0] tick_sched_timer+0x43/0xe0 [ 43.291168][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.296340][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.301252][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.306682][ C0] apic_timer_interrupt+0xf/0x20 [ 43.311585][ C0] [ 43.313890][ C0] read to 0xffffffff86042008 of 8 bytes by interrupt on cpu 0: [ 43.321405][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 43.326841][ C0] tick_sched_do_timer+0xd4/0xe0 [ 43.331751][ C0] tick_sched_timer+0x43/0xe0 [ 43.336399][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.341571][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.346485][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.351915][ C0] apic_timer_interrupt+0xf/0x20 [ 43.356825][ C0] __kcsan_setup_watchpoint+0xd/0x510 [ 43.362193][ C0] __tsan_read8+0x2c/0x30 [ 43.366668][ C0] tcp_gro_receive+0x6eb/0x7a0 [ 43.371407][ C0] tcp4_gro_receive+0x365/0x4b0 [ 43.376229][ C0] inet_gro_receive+0x7b5/0x800 [ 43.381069][ C0] dev_gro_receive+0xa05/0x1190 [ 43.385899][ C0] [ 43.388212][ C0] Reported by Kernel Concurrency Sanitizer on: [ 43.394343][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 43.401608][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.411635][ C0] ================================================================== [ 43.419667][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 43.426224][ C0] CPU: 0 PID: 9 Comm: ksoftirqd/0 Not tainted 5.4.0-rc3+ #0 [ 43.433490][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 43.443517][ C0] Call Trace: [ 43.446776][ C0] [ 43.449624][ C0] dump_stack+0xf5/0x159 [ 43.453870][ C0] panic+0x210/0x640 [ 43.457736][ C0] ? __tsan_read8+0x2c/0x30 [ 43.462216][ C0] ? vprintk_func+0x8d/0x140 [ 43.466784][ C0] kcsan_report.cold+0xc/0x1b [ 43.471440][ C0] __kcsan_setup_watchpoint+0x3ee/0x510 [ 43.476956][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.482561][ C0] __tsan_read8+0x2c/0x30 [ 43.486863][ C0] tick_do_update_jiffies64+0x2b/0x260 [ 43.492296][ C0] tick_sched_do_timer+0xd4/0xe0 [ 43.497221][ C0] tick_sched_timer+0x43/0xe0 [ 43.501888][ C0] __hrtimer_run_queues+0x288/0x600 [ 43.507067][ C0] ? tick_sched_do_timer+0xe0/0xe0 [ 43.512168][ C0] hrtimer_interrupt+0x22a/0x480 [ 43.517097][ C0] smp_apic_timer_interrupt+0xdc/0x280 [ 43.522533][ C0] ? do_IRQ+0xcb/0x180 [ 43.526582][ C0] apic_timer_interrupt+0xf/0x20 [ 43.531523][ C0] [ 43.534439][ C0] RIP: 0010:__kcsan_setup_watchpoint+0xd/0x510 [ 43.540568][ C0] Code: c3 c3 bf 04 00 00 00 41 bf 02 00 00 00 e8 6b 0b 00 00 eb bc 66 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56 41 55 49 89 fd <41> 54 49 89 f4 53 89 d3 48 83 ec 18 66 0f 1f 44 00 00 65 8b 05 72 [ 43.560194][ C0] RSP: 0018:ffffc90000cb38d0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 [ 43.568575][ C0] RAX: 0000000000000001 RBX: ffff888125124f30 RCX: 0000ffffffffffff [ 43.576523][ C0] RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff888125124fc8 [ 43.584466][ C0] RBP: ffffc90000cb38e8 R08: 0000000000000000 R09: 0000888125124fcf [ 43.592544][ C0] R10: 00000000aaaaaaab R11: ffffffff86045d38 R12: ffff888125124fc8 [ 43.600490][ C0] R13: ffff888125124fc8 R14: ffff888125124f00 R15: 00000000000000b2 [ 43.608446][ C0] __tsan_read8+0x2c/0x30 [ 43.612748][ C0] tcp_gro_receive+0x6eb/0x7a0 [ 43.617484][ C0] tcp4_gro_receive+0x365/0x4b0 [ 43.622309][ C0] inet_gro_receive+0x7b5/0x800 [ 43.627146][ C0] dev_gro_receive+0xa05/0x1190 [ 43.631969][ C0] ? __kcsan_check_watchpoint+0x29/0x180 [ 43.637581][ C0] napi_gro_receive+0x7c/0x330 [ 43.642327][ C0] receive_buf+0x284/0x30b0 [ 43.646803][ C0] ? __tsan_write8+0x32/0x40 [ 43.651371][ C0] ? virtqueue_get_buf_ctx+0x4fd/0x5c0 [ 43.656802][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.662405][ C0] ? __kcsan_setup_watchpoint+0x96/0x510 [ 43.668012][ C0] virtnet_poll+0x436/0x7d0 [ 43.672494][ C0] ? __sanitizer_cov_trace_const_cmp1+0x1a/0x20 [ 43.678712][ C0] net_rx_action+0x3ae/0xa90 [ 43.683294][ C0] __do_softirq+0x115/0x33f [ 43.687778][ C0] ? takeover_tasklets+0x250/0x250 [ 43.692864][ C0] run_ksoftirqd+0x46/0x60 [ 43.697271][ C0] smpboot_thread_fn+0x37d/0x4a0 [ 43.702186][ C0] kthread+0x1d4/0x200 [ 43.706234][ C0] ? constant_test_bit.constprop.0+0x30/0x30 [ 43.712190][ C0] ? kthread_stop+0x2d0/0x2d0 [ 43.716838][ C0] ret_from_fork+0x1f/0x30 [ 43.722410][ C0] Kernel Offset: disabled [ 43.726726][ C0] Rebooting in 86400 seconds..