[....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [ 34.800270][ T25] audit: type=1800 audit(1571638754.801:25): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="cron" dev="sda1" ino=2447 res=0 [ 34.819861][ T25] audit: type=1800 audit(1571638754.801:26): pid=7092 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="mcstrans" dev="sda1" ino=2490 res=0 [ 34.819879][ T25] audit: type=1800 audit(1571638754.801:27): pid=7092 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 '10.128.0.74' (ECDSA) to the list of known hosts. 2019/10/21 06:19:22 fuzzer started 2019/10/21 06:19:24 dialing manager at 10.128.0.105:43535 2019/10/21 06:19:24 syscalls: 2524 2019/10/21 06:19:24 code coverage: enabled 2019/10/21 06:19:24 comparison tracing: enabled 2019/10/21 06:19:24 extra coverage: extra coverage is not supported by the kernel 2019/10/21 06:19:24 setuid sandbox: enabled 2019/10/21 06:19:24 namespace sandbox: enabled 2019/10/21 06:19:24 Android sandbox: /sys/fs/selinux/policy does not exist 2019/10/21 06:19:24 fault injection: enabled 2019/10/21 06:19:24 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2019/10/21 06:19:24 net packet injection: enabled 2019/10/21 06:19:24 net device setup: enabled 2019/10/21 06:19:24 concurrency sanitizer: enabled syzkaller login: [ 44.647784][ T0] ================================================================== [ 44.655936][ T0] BUG: KCSAN: data-race in mod_timer / timer_clear_idle [ 44.663860][ T0] [ 44.666233][ T0] read to 0xffff88812bf1b6e4 of 1 bytes by interrupt on cpu 0: [ 44.673768][ T0] mod_timer+0x50d/0x7a0 [ 44.677990][ T0] sk_reset_timer+0x2d/0x70 [ 44.682489][ T0] tcp_send_delayed_ack+0x21d/0x2b0 [ 44.687675][ T0] __tcp_ack_snd_check+0x3d1/0x4f0 [ 44.692764][ T0] tcp_rcv_established+0xce9/0xf50 [ 44.697866][ T0] tcp_v4_do_rcv+0x381/0x4e0 [ 44.702454][ T0] tcp_v4_rcv+0x19dc/0x1bb0 [ 44.706938][ T0] ip_protocol_deliver_rcu+0x4d/0x420 [ 44.712344][ T0] ip_local_deliver_finish+0x110/0x140 [ 44.717778][ T0] ip_local_deliver+0x133/0x210 [ 44.722602][ T0] ip_rcv_finish+0x121/0x160 [ 44.727166][ T0] ip_rcv+0x18f/0x1a0 [ 44.731130][ T0] __netif_receive_skb_one_core+0xa7/0xe0 [ 44.736831][ T0] __netif_receive_skb+0x37/0xf0 [ 44.741740][ T0] [ 44.744047][ T0] write to 0xffff88812bf1b6e4 of 1 bytes by task 0 on cpu 1: [ 44.751406][ T0] timer_clear_idle+0x42/0x50 [ 44.756060][ T0] tick_nohz_next_event+0x164/0x380 [ 44.761235][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 44.766756][ T0] do_idle+0x1a5/0x280 [ 44.770799][ T0] cpu_startup_entry+0x1b/0x20 [ 44.775541][ T0] start_secondary+0x208/0x260 [ 44.780293][ T0] secondary_startup_64+0xa4/0xb0 [ 44.785284][ T0] [ 44.787587][ T0] Reported by Kernel Concurrency Sanitizer on: [ 44.793716][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 44.800795][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.810837][ T0] ================================================================== [ 44.818920][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 44.825489][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.4.0-rc3+ #0 [ 44.832591][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 44.842634][ T0] Call Trace: [ 44.845907][ T0] dump_stack+0xf5/0x159 [ 44.850129][ T0] panic+0x210/0x640 [ 44.854005][ T0] ? vprintk_func+0x8d/0x140 [ 44.858574][ T0] kcsan_report.cold+0xc/0x10 [ 44.863229][ T0] __kcsan_setup_watchpoint+0x32e/0x4a0 [ 44.868765][ T0] __tsan_write1+0x32/0x40 [ 44.873163][ T0] timer_clear_idle+0x42/0x50 [ 44.878253][ T0] tick_nohz_next_event+0x164/0x380 [ 44.883430][ T0] tick_nohz_idle_stop_tick+0x3c2/0x670 [ 44.888955][ T0] ? __tsan_read4+0x2c/0x30 [ 44.893437][ T0] ? __sanitizer_cov_trace_const_cmp4+0x16/0x20 [ 44.899656][ T0] do_idle+0x1a5/0x280 [ 44.903700][ T0] ? complete+0x44/0x50 [ 44.907837][ T0] cpu_startup_entry+0x1b/0x20 [ 44.912579][ T0] start_secondary+0x208/0x260 [ 44.917327][ T0] secondary_startup_64+0xa4/0xb0 [ 44.923581][ T0] Kernel Offset: disabled [ 44.927906][ T0] Rebooting in 86400 seconds..