[info] Using makefile-style concurrent boot in runlevel 2. [ 43.000783][ T27] audit: type=1800 audit(1585243738.058:21): pid=7585 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0 [ 43.050040][ T27] audit: type=1800 audit(1585243738.068:22): pid=7585 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 '10.128.0.234' (ECDSA) to the list of known hosts. 2020/03/26 17:29:08 fuzzer started 2020/03/26 17:29:10 dialing manager at 10.128.0.105:44023 2020/03/26 17:29:10 syscalls: 2955 2020/03/26 17:29:10 code coverage: enabled 2020/03/26 17:29:10 comparison tracing: enabled 2020/03/26 17:29:10 extra coverage: enabled 2020/03/26 17:29:10 setuid sandbox: enabled 2020/03/26 17:29:10 namespace sandbox: enabled 2020/03/26 17:29:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/03/26 17:29:10 fault injection: enabled 2020/03/26 17:29:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/03/26 17:29:10 net packet injection: enabled 2020/03/26 17:29:10 net device setup: enabled 2020/03/26 17:29:10 concurrency sanitizer: enabled 2020/03/26 17:29:10 devlink PCI setup: PCI device 0000:00:10.0 is not available syzkaller login: [ 56.191538][ T7757] KCSAN: could not find function: 'poll_schedule_timeout' 2020/03/26 17:29:13 adding functions to KCSAN blacklist: '__ext4_new_inode' '__delete_from_page_cache' 'audit_log_start' 'poll_schedule_timeout' 'blk_mq_sched_dispatch_requests' 'xas_clear_mark' 'generic_write_end' 'copy_process' 'add_timer' 'run_timer_softirq' 'ep_poll' 'tick_sched_do_timer' 'kauditd_thread' 'find_get_pages_range_tag' 'shmem_getpage_gfp' 'wbt_done' 'do_syslog' 'tick_nohz_idle_stop_tick' 'blk_mq_get_request' 'mod_timer' 'ktime_get_real_seconds' 'list_lru_count_one' 'lruvec_lru_size' 'do_nanosleep' 'blk_mq_dispatch_rq_list' 'ext4_has_free_clusters' '_find_next_bit' [ 58.785262][ T7757] KCSAN: could not find function: '_find_next_bit' [ 154.533214][ C0] ================================================================== [ 154.541376][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 [ 154.549814][ C0] [ 154.552140][ C0] write to 0xffff88812c11dbe4 of 1 bytes by task 0 on cpu 1: [ 154.559504][ C0] timer_clear_idle+0x3d/0x50 [ 154.564172][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 154.570064][ C0] tick_nohz_idle_exit+0x19c/0x1d0 [ 154.575174][ C0] do_idle+0xac/0x290 [ 154.579142][ C0] cpu_startup_entry+0x14/0x20 [ 154.583903][ C0] start_secondary+0x164/0x1b0 [ 154.588651][ C0] secondary_startup_64+0xa4/0xb0 [ 154.593652][ C0] [ 154.595966][ C0] read to 0xffff88812c11dbe4 of 1 bytes by interrupt on cpu 0: [ 154.603495][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 154.609024][ C0] mod_timer+0x50e/0x830 [ 154.613353][ C0] sk_reset_timer+0x29/0xc0 [ 154.617850][ C0] tcp_send_delayed_ack+0x1fd/0x280 [ 154.623036][ C0] __tcp_ack_snd_check+0x3bb/0x550 [ 154.628140][ C0] tcp_rcv_established+0x72b/0xee0 [ 154.633268][ C0] tcp_v4_do_rcv+0x396/0x4f0 [ 154.637867][ C0] tcp_v4_rcv+0x1bbf/0x1d80 [ 154.642367][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 154.647775][ C0] ip_local_deliver_finish+0xf3/0x120 [ 154.653134][ C0] ip_local_deliver+0x135/0x220 [ 154.657967][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 154.663143][ C0] ip_sublist_rcv+0x3f8/0x530 [ 154.667807][ C0] ip_list_rcv+0x2f3/0x321 [ 154.672230][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 154.678228][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 154.684377][ C0] gro_normal_list.part.0+0x37/0xa0 [ 154.689577][ C0] napi_complete_done+0x1d3/0x3a0 [ 154.694613][ C0] virtqueue_napi_complete+0x36/0xa0 [ 154.699883][ C0] virtnet_poll+0x771/0x790 [ 154.704387][ C0] net_rx_action+0x3ad/0xac0 [ 154.708962][ C0] __do_softirq+0x118/0x34a [ 154.713472][ C0] irq_exit+0xb5/0xd0 [ 154.717437][ C0] do_IRQ+0x7b/0x120 [ 154.721323][ C0] ret_from_intr+0x0/0x21 [ 154.725655][ C0] native_safe_halt+0xe/0x10 [ 154.730224][ C0] default_idle+0x21/0x170 [ 154.734621][ C0] do_idle+0x1b7/0x290 [ 154.738671][ C0] cpu_startup_entry+0x14/0x20 [ 154.743429][ C0] rest_init+0xe4/0xeb [ 154.747489][ C0] arch_call_rest_init+0x13/0x2b [ 154.752413][ C0] start_kernel+0xcc2/0xceb [ 154.756921][ C0] secondary_startup_64+0xa4/0xb0 [ 154.761920][ C0] [ 154.764245][ C0] Reported by Kernel Concurrency Sanitizer on: [ 154.770381][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 154.778256][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 154.788399][ C0] ================================================================== [ 154.796638][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 154.803217][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0 [ 154.811086][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 154.821147][ C0] Call Trace: [ 154.824411][ C0] [ 154.827251][ C0] dump_stack+0x11d/0x187 [ 154.831596][ C0] panic+0x210/0x640 [ 154.835488][ C0] ? vprintk_func+0x89/0x13a [ 154.840083][ C0] kcsan_report.cold+0xc/0xf [ 154.844687][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 154.850067][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 154.855617][ C0] mod_timer+0x50e/0x830 [ 154.859858][ C0] sk_reset_timer+0x29/0xc0 [ 154.864350][ C0] tcp_send_delayed_ack+0x1fd/0x280 [ 154.869553][ C0] __tcp_ack_snd_check+0x3bb/0x550 [ 154.874652][ C0] ? constant_test_bit+0xd/0x30 [ 154.879498][ C0] tcp_rcv_established+0x72b/0xee0 [ 154.884598][ C0] tcp_v4_do_rcv+0x396/0x4f0 [ 154.889170][ C0] tcp_v4_rcv+0x1bbf/0x1d80 [ 154.893678][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 154.899046][ C0] ip_local_deliver_finish+0xf3/0x120 [ 154.904406][ C0] ip_local_deliver+0x135/0x220 [ 154.909255][ C0] ? ip_protocol_deliver_rcu+0x410/0x410 [ 154.914886][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 154.920077][ C0] ip_sublist_rcv+0x3f8/0x530 [ 154.924797][ C0] ? ip_sublist_rcv+0x530/0x530 [ 154.929679][ C0] ip_list_rcv+0x2f3/0x321 [ 154.934084][ C0] ? ip_rcv+0x1b0/0x1b0 [ 154.938228][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 154.944197][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 154.949644][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 154.955781][ C0] ? receive_buf+0x25d/0x2e20 [ 154.960444][ C0] gro_normal_list.part.0+0x37/0xa0 [ 154.965626][ C0] napi_complete_done+0x1d3/0x3a0 [ 154.970646][ C0] ? virtqueue_enable_cb_prepare+0x19b/0x2a0 [ 154.976621][ C0] virtqueue_napi_complete+0x36/0xa0 [ 154.981900][ C0] virtnet_poll+0x771/0x790 [ 154.986419][ C0] net_rx_action+0x3ad/0xac0 [ 154.991008][ C0] __do_softirq+0x118/0x34a [ 154.995506][ C0] irq_exit+0xb5/0xd0 [ 154.999486][ C0] do_IRQ+0x7b/0x120 [ 155.003371][ C0] common_interrupt+0xf/0xf [ 155.007852][ C0] [ 155.010808][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 155.016205][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d fc f8 43 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec f8 43 00 fb f4 cc 41 54 55 53 e8 37 fc 9a fc e8 12 ae b3 fd 0f 1f 44 00 00 48 [ 155.035797][ C0] RSP: 0018:ffffffff85a03e50 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 155.044195][ C0] RAX: 0000000000000000 RBX: ffffffff85a2b840 RCX: ffffffff82522f51 [ 155.052174][ C0] RDX: 0000000000000000 RSI: ffffffff82522f5a RDI: 0000000000000005 [ 155.060149][ C0] RBP: 0000000000000000 R08: ffffffff85a2b840 R09: 0000ffff8584b160 [ 155.068145][ C0] R10: 0000ffff85a03e38 R11: 0000ffff8584b167 R12: ffffffff85a2b840 [ 155.076104][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85a2b840 [ 155.084181][ C0] ? debug_smp_processor_id+0x31/0x129 [ 155.089759][ C0] ? debug_smp_processor_id+0x3a/0x129 [ 155.095210][ C0] default_idle+0x21/0x170 [ 155.099612][ C0] do_idle+0x1b7/0x290 [ 155.103680][ C0] ? debug_smp_processor_id+0x3a/0x129 [ 155.109126][ C0] cpu_startup_entry+0x14/0x20 [ 155.113889][ C0] rest_init+0xe4/0xeb [ 155.117953][ C0] arch_call_rest_init+0x13/0x2b [ 155.122987][ C0] start_kernel+0xcc2/0xceb [ 155.127483][ C0] secondary_startup_64+0xa4/0xb0 [ 155.133509][ C0] Kernel Offset: disabled [ 155.137829][ C0] Rebooting in 86400 seconds..