[info] Using makefile-style concurrent boot in runlevel 2. [ 44.064784][ T27] audit: type=1800 audit(1583765837.363:21): pid=7661 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 44.109413][ T27] audit: type=1800 audit(1583765837.363:22): pid=7661 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="motd" dev="sda1" ino=2480 res=0 [....] Starting enhanced syslogd: rsyslogd[?25l[?1c7[ ok 8[?25h[?0c. [....] 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 '10.128.0.186' (ECDSA) to the list of known hosts. 2020/03/09 14:57:26 fuzzer started 2020/03/09 14:57:28 dialing manager at 10.128.0.105:40259 2020/03/09 14:57:28 syscalls: 2955 2020/03/09 14:57:28 code coverage: enabled 2020/03/09 14:57:28 comparison tracing: enabled 2020/03/09 14:57:28 extra coverage: enabled 2020/03/09 14:57:28 setuid sandbox: enabled 2020/03/09 14:57:28 namespace sandbox: enabled 2020/03/09 14:57:28 Android sandbox: /sys/fs/selinux/policy does not exist 2020/03/09 14:57:28 fault injection: enabled 2020/03/09 14:57:28 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/03/09 14:57:28 net packet injection: enabled 2020/03/09 14:57:28 net device setup: enabled 2020/03/09 14:57:28 concurrency sanitizer: enabled 2020/03/09 14:57:28 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/03/09 14:57:30 adding functions to KCSAN blacklist: '__ext4_new_inode' 'ep_poll' 'list_lru_count_one' 'xas_clear_mark' 'ext4_nonda_switch' 'ext4_setattr' 'find_get_pages_range_tag' 'run_timer_softirq' 'ext4_free_inodes_count' 'blk_mq_dispatch_rq_list' 'mod_timer' 'copy_process' 'do_nanosleep' 'kauditd_thread' 'generic_write_end' 'echo_char' 'shmem_file_read_iter' 'ext4_mark_iloc_dirty' syzkaller login: [ 81.929482][ T0] ================================================================== [ 81.937648][ T0] BUG: KCSAN: data-race in tick_nohz_idle_stop_tick / tick_sched_do_timer [ 81.946140][ T0] [ 81.948475][ T0] write to 0xffffffff85d05610 of 4 bytes by interrupt on cpu 0: [ 81.956116][ T0] tick_sched_do_timer+0xb4/0xd0 [ 81.961061][ T0] tick_sched_timer+0x3f/0xd0 [ 81.965738][ T0] __hrtimer_run_queues+0x271/0x600 [ 81.970939][ T0] hrtimer_interrupt+0x226/0x490 [ 81.975890][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 81.981353][ T0] apic_timer_interrupt+0xf/0x20 [ 81.986302][ T0] hash_conntrack_raw+0x198/0x280 [ 81.991411][ T0] nf_conntrack_in+0x2be/0xa60 [ 81.996184][ T0] ipv4_conntrack_in+0x23/0x40 [ 82.000950][ T0] nf_hook_slow+0x7c/0x160 [ 82.005370][ T0] nf_hook_slow_list+0x140/0x29f [ 82.010294][ T0] ip_sublist_rcv+0x4f9/0x530 [ 82.014995][ T0] ip_list_rcv+0x2f3/0x321 [ 82.019403][ T0] __netif_receive_skb_list_core+0x368/0x5c0 [ 82.025363][ T0] netif_receive_skb_list_internal+0x5c7/0x810 [ 82.031499][ T0] gro_normal_list.part.0+0x37/0xa0 [ 82.036682][ T0] gro_normal_one+0x14c/0x160 [ 82.041348][ T0] napi_gro_receive+0x27d/0x2f0 [ 82.046176][ T0] receive_buf+0x24e/0x2e20 [ 82.050664][ T0] virtnet_poll+0x343/0x790 [ 82.055156][ T0] net_rx_action+0x3ad/0xac0 [ 82.059736][ T0] __do_softirq+0x118/0x34a [ 82.064264][ T0] run_ksoftirqd+0x41/0x60 [ 82.068669][ T0] smpboot_thread_fn+0x374/0x4a0 [ 82.073588][ T0] kthread+0x1cb/0x1f0 [ 82.077635][ T0] ret_from_fork+0x1f/0x30 [ 82.082028][ T0] [ 82.084456][ T0] read to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 1: [ 82.091732][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 82.097260][ T0] do_idle+0x1ad/0x290 [ 82.101308][ T0] cpu_startup_entry+0x14/0x20 [ 82.106076][ T0] start_secondary+0x164/0x1b0 [ 82.110821][ T0] secondary_startup_64+0xa4/0xb0 [ 82.115816][ T0] [ 82.118120][ T0] Reported by Kernel Concurrency Sanitizer on: [ 82.124254][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 82.132115][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.142195][ T0] ================================================================== [ 82.150241][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 82.156811][ T0] CPU: 1 PID: 0 Comm: swapper/1 Not tainted 5.6.0-rc1-syzkaller #0 [ 82.164687][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 82.174720][ T0] Call Trace: [ 82.178000][ T0] dump_stack+0x11d/0x187 [ 82.182316][ T0] panic+0x210/0x640 [ 82.186192][ T0] ? vprintk_func+0x89/0x13a [ 82.190767][ T0] kcsan_report.cold+0xc/0x14 [ 82.195427][ T0] kcsan_setup_watchpoint+0x3e3/0x420 [ 82.200823][ T0] tick_nohz_idle_stop_tick+0x191/0x680 [ 82.206350][ T0] do_idle+0x1ad/0x290 [ 82.210398][ T0] ? debug_smp_processor_id+0x3a/0x129 [ 82.215837][ T0] cpu_startup_entry+0x14/0x20 [ 82.220596][ T0] start_secondary+0x164/0x1b0 [ 82.225340][ T0] secondary_startup_64+0xa4/0xb0 [ 82.231632][ T0] Kernel Offset: disabled [ 82.235953][ T0] Rebooting in 86400 seconds..