[info] Using makefile-style concurrent boot in runlevel 2. [ 43.939756][ T27] audit: type=1800 audit(1583924242.175:21): pid=7641 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.998744][ T27] audit: type=1800 audit(1583924242.175:22): pid=7641 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 '10.128.0.103' (ECDSA) to the list of known hosts. 2020/03/11 10:57:33 fuzzer started 2020/03/11 10:57:35 dialing manager at 10.128.0.105:45627 2020/03/11 10:57:37 syscalls: 2955 2020/03/11 10:57:37 code coverage: enabled 2020/03/11 10:57:37 comparison tracing: enabled 2020/03/11 10:57:37 extra coverage: enabled 2020/03/11 10:57:37 setuid sandbox: enabled 2020/03/11 10:57:37 namespace sandbox: enabled 2020/03/11 10:57:37 Android sandbox: /sys/fs/selinux/policy does not exist 2020/03/11 10:57:37 fault injection: enabled 2020/03/11 10:57:37 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/03/11 10:57:37 net packet injection: enabled 2020/03/11 10:57:37 net device setup: enabled 2020/03/11 10:57:37 concurrency sanitizer: enabled 2020/03/11 10:57:37 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 59.491980][ T7808] KCSAN: could not find function: 'poll_schedule_timeout' [ 60.110288][ T7808] KCSAN: could not find function: '_find_next_bit' 2020/03/11 10:57:38 adding functions to KCSAN blacklist: 'poll_schedule_timeout' 'mod_timer' 'ext4_has_free_clusters' 'tick_nohz_idle_stop_tick' '_find_next_bit' 'ep_poll' 'find_get_pages_range_tag' 'run_timer_softirq' 'ktime_get_real_seconds' 'blk_mq_dispatch_rq_list' 'add_timer' [ 63.744835][ T0] ================================================================== [ 63.753045][ T0] BUG: KCSAN: data-race in tick_nohz_next_event / tick_sched_do_timer [ 63.761203][ T0] [ 63.763544][ T0] write to 0xffffffff85d05610 of 4 bytes by interrupt on cpu 1: [ 63.771194][ T0] tick_sched_do_timer+0xb4/0xd0 [ 63.776143][ T0] tick_sched_timer+0x3f/0xd0 [ 63.780860][ T0] __hrtimer_run_queues+0x271/0x600 [ 63.786060][ T0] hrtimer_interrupt+0x226/0x490 [ 63.791018][ T0] smp_apic_timer_interrupt+0xd8/0x270 [ 63.796584][ T0] apic_timer_interrupt+0xf/0x20 [ 63.801508][ T0] kcsan_setup_watchpoint+0x242/0x420 [ 63.806864][ T0] ipt_do_table+0x6c0/0xe70 [ 63.811344][ T0] iptable_security_hook+0x44/0x60 [ 63.816436][ T0] nf_hook_slow+0x7c/0x160 [ 63.820870][ T0] ip_local_deliver+0x1f2/0x220 [ 63.825814][ T0] ip_sublist_rcv_finish+0xf0/0x140 [ 63.830993][ T0] ip_sublist_rcv+0x3f8/0x530 [ 63.835660][ T0] ip_list_rcv+0x2f3/0x321 [ 63.840065][ T0] __netif_receive_skb_list_core+0x368/0x5c0 [ 63.846022][ T0] netif_receive_skb_list_internal+0x5c7/0x810 [ 63.852160][ T0] gro_normal_list.part.0+0x37/0xa0 [ 63.857354][ T0] gro_normal_one+0x14c/0x160 [ 63.862050][ T0] napi_gro_receive+0x27d/0x2f0 [ 63.866890][ T0] receive_buf+0x24e/0x2e20 [ 63.871372][ T0] virtnet_poll+0x343/0x790 [ 63.876045][ T0] net_rx_action+0x3ad/0xac0 [ 63.880621][ T0] __do_softirq+0x118/0x34a [ 63.885344][ T0] run_ksoftirqd+0x41/0x60 [ 63.889921][ T0] smpboot_thread_fn+0x374/0x4a0 [ 63.894861][ T0] kthread+0x1cb/0x1f0 [ 63.898948][ T0] ret_from_fork+0x1f/0x30 [ 63.903339][ T0] [ 63.905656][ T0] read to 0xffffffff85d05610 of 4 bytes by task 0 on cpu 0: [ 63.912932][ T0] tick_nohz_next_event+0x192/0x350 [ 63.918111][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 63.923637][ T0] do_idle+0x1ad/0x290 [ 63.927698][ T0] cpu_startup_entry+0x14/0x20 [ 63.932458][ T0] rest_init+0xe4/0xeb [ 63.936628][ T0] arch_call_rest_init+0x13/0x2b [ 63.941549][ T0] start_kernel+0xcc2/0xceb [ 63.946033][ T0] secondary_startup_64+0xa4/0xb0 [ 63.951092][ T0] [ 63.953399][ T0] Reported by Kernel Concurrency Sanitizer on: [ 63.959538][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 63.967423][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.977472][ T0] ================================================================== [ 63.985522][ T0] Kernel panic - not syncing: panic_on_warn set ... [ 63.992091][ T0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 63.999954][ T0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 64.009996][ T0] Call Trace: [ 64.013277][ T0] dump_stack+0x11d/0x187 [ 64.017609][ T0] panic+0x210/0x640 [ 64.021556][ T0] ? vprintk_func+0x89/0x13a [ 64.026584][ T0] kcsan_report.cold+0xc/0x14 [ 64.031465][ T0] kcsan_setup_watchpoint+0x3e3/0x420 [ 64.036849][ T0] tick_nohz_next_event+0x192/0x350 [ 64.042045][ T0] tick_nohz_idle_stop_tick+0x3b9/0x680 [ 64.047570][ T0] ? ktime_get+0x1c9/0x210 [ 64.051970][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 64.057409][ T0] do_idle+0x1ad/0x290 [ 64.061472][ T0] ? debug_smp_processor_id+0x3f/0x129 [ 64.066917][ T0] cpu_startup_entry+0x14/0x20 [ 64.071665][ T0] rest_init+0xe4/0xeb [ 64.075724][ T0] arch_call_rest_init+0x13/0x2b [ 64.080650][ T0] start_kernel+0xcc2/0xceb [ 64.085138][ T0] secondary_startup_64+0xa4/0xb0 [ 64.091888][ T0] Kernel Offset: disabled [ 64.096225][ T0] Rebooting in 86400 seconds..