[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 35.697047][ T26] audit: type=1800 audit(1571342286.989:25): pid=7117 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 35.743577][ T26] audit: type=1800 audit(1571342286.989:26): pid=7117 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 35.778824][ T26] audit: type=1800 audit(1571342286.989:27): pid=7117 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 '10.128.0.200' (ECDSA) to the list of known hosts. 2019/10/17 19:58:17 fuzzer started 2019/10/17 19:58:19 dialing manager at 10.128.0.105:43535 2019/10/17 19:58:19 syscalls: 2524 2019/10/17 19:58:19 code coverage: enabled 2019/10/17 19:58:19 comparison tracing: enabled 2019/10/17 19:58:19 extra coverage: extra coverage is not supported by the kernel 2019/10/17 19:58:19 setuid sandbox: enabled 2019/10/17 19:58:19 namespace sandbox: enabled 2019/10/17 19:58:19 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/17 19:58:19 fault injection: enabled 2019/10/17 19:58:19 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/17 19:58:19 net packet injection: enabled 2019/10/17 19:58:19 net device setup: enabled 2019/10/17 19:58:19 concurrency sanitizer: enabled syzkaller login: [ 48.563659][ C1] ================================================================== [ 48.571991][ C1] BUG: KCSAN: data-race in mod_timer / run_timer_softirq [ 48.578999][ C1] [ 48.581311][ C1] read to 0xffff88812bf1b6c8 of 8 bytes by task 7281 on cpu 0: [ 48.588846][ C1] mod_timer+0x1ec/0x7a0 [ 48.593172][ C1] sk_reset_timer+0x2d/0x70 [ 48.597672][ C1] tcp_send_delayed_ack+0x21d/0x2b0 [ 48.603000][ C1] __tcp_ack_snd_check+0x3d1/0x4f0 [ 48.608274][ C1] tcp_rcv_established+0xce9/0xf50 [ 48.613372][ C1] tcp_v4_do_rcv+0x381/0x4e0 [ 48.618058][ C1] __release_sock+0x135/0x1e0 [ 48.625840][ C1] release_sock+0x61/0x160 [ 48.630237][ C1] tcp_recvmsg+0x63b/0x1a30 [ 48.634715][ C1] inet_recvmsg+0xbb/0x250 [ 48.639164][ C1] sock_recvmsg+0x92/0xb0 [ 48.645150][ C1] sock_read_iter+0x15f/0x1e0 [ 48.649996][ C1] new_sync_read+0x389/0x4f0 [ 48.654700][ C1] __vfs_read+0xb1/0xc0 [ 48.658913][ C1] [ 48.661221][ C1] write to 0xffff88812bf1b6c8 of 8 bytes by interrupt on cpu 1: [ 48.669026][ C1] run_timer_softirq+0xcc0/0xd20 [ 48.674084][ C1] __do_softirq+0x115/0x33f [ 48.679278][ C1] run_ksoftirqd+0x46/0x60 [ 48.683674][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 48.690592][ C1] kthread+0x1d4/0x200 [ 48.695077][ C1] ret_from_fork+0x1f/0x30 [ 48.699562][ C1] [ 48.701871][ C1] Reported by Kernel Concurrency Sanitizer on: [ 48.708107][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 48.715447][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.725561][ C1] ================================================================== [ 48.733596][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 48.740334][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.4.0-rc3+ #0 [ 48.747856][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 48.758147][ C1] Call Trace: [ 48.761425][ C1] dump_stack+0xf5/0x159 [ 48.765774][ C1] panic+0x210/0x640 [ 48.769737][ C1] ? vprintk_func+0x8d/0x140 [ 48.774583][ C1] kcsan_report.cold+0xc/0x10 [ 48.783633][ C1] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 48.791033][ C1] ? __sanitizer_cov_trace_cmp4+0x16/0x20 [ 48.796851][ C1] ? dsp_cmx_receive+0x730/0x730 [ 48.802137][ C1] __tsan_write8+0x32/0x40 [ 48.806566][ C1] run_timer_softirq+0xcc0/0xd20 [ 48.811667][ C1] ? sched_clock+0x34/0x40 [ 48.816240][ C1] ? sched_clock_cpu+0x15/0xe0 [ 48.820986][ C1] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 48.827386][ C1] __do_softirq+0x115/0x33f [ 48.832098][ C1] ? takeover_tasklets+0x250/0x250 [ 48.837209][ C1] run_ksoftirqd+0x46/0x60 [ 48.841921][ C1] smpboot_thread_fn+0x37d/0x4a0 [ 48.847283][ C1] kthread+0x1d4/0x200 [ 48.851361][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 48.857810][ C1] ? kthread_stop+0x2d0/0x2d0 [ 48.862915][ C1] ret_from_fork+0x1f/0x30 [ 48.869439][ C1] Kernel Offset: disabled [ 48.874251][ C1] Rebooting in 86400 seconds..