[[36minfo[39;49m] Using makefile-style concurrent boot in runlevel 2.
[ 45.969337][ T27] audit: type=1800 audit(1582758453.037:21): pid=7521 uid=0 auid=4294967295 ses=4294967295 subj==unconfined op=collect_data cause=failed(directio) comm="startpar" name="bootlogs" dev="sda1" ino=2452 res=0
[ 46.017795][ T27] audit: type=1800 audit(1582758453.037:22): pid=7521 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[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting periodic command scheduler: cron[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
[....] Starting OpenBSD Secure Shell server: sshd[?25l[?1c7[1G[[32m ok [39;49m8[?25h[?0c.
Debian GNU/Linux 7 syzkaller ttyS0
Warning: Permanently added '10.128.0.145' (ECDSA) to the list of known hosts.
2020/02/26 23:07:45 fuzzer started
2020/02/26 23:07:47 dialing manager at 10.128.0.105:41269
2020/02/26 23:07:47 syscalls: 2955
2020/02/26 23:07:47 code coverage: enabled
2020/02/26 23:07:47 comparison tracing: enabled
2020/02/26 23:07:47 extra coverage: enabled
2020/02/26 23:07:47 setuid sandbox: enabled
2020/02/26 23:07:47 namespace sandbox: enabled
2020/02/26 23:07:47 Android sandbox: /sys/fs/selinux/policy does not exist
2020/02/26 23:07:47 fault injection: enabled
2020/02/26 23:07:47 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/02/26 23:07:47 net packet injection: enabled
2020/02/26 23:07:47 net device setup: enabled
2020/02/26 23:07:47 concurrency sanitizer: enabled
2020/02/26 23:07:47 devlink PCI setup: PCI device 0000:00:10.0 is not available
syzkaller login: [ 60.901294][ T7688] KCSAN: could not find function: '_find_next_bit'
[ 61.682452][ T7688] KCSAN: could not find function: 'poll_schedule_timeout'
[ 62.166577][ T7688] KCSAN: could not find function: '__follow_mount_rcu'
2020/02/26 23:07:54 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' '_find_next_bit' 'wbt_done' 'ext4_writepages' 'ktime_get_real_seconds' 'audit_log_start' 'poll_schedule_timeout' '__follow_mount_rcu' '__ext4_new_inode' 'generic_fillattr' 'blk_mq_dispatch_rq_list' 'run_timer_softirq' 'blk_mq_get_request' 'kauditd_thread' 'ep_poll' 'generic_write_end' 'n_tty_receive_buf_common' 'do_nanosleep' 'kcm_rfree' 'do_signal_stop' 'xas_find_marked' '__find_get_block' 'wbt_issue' 'do_syslog' 'get_cpu_iowait_time_us' 'pcpu_alloc' 'dd_has_work' 'ext4_mark_iloc_dirty' 'atime_needs_update' '__snd_rawmidi_transmit_ack' 'tick_nohz_next_event' 'add_timer' 'snd_seq_check_queue' 'pipe_double_lock' 'blk_mq_sched_dispatch_requests' 'shmem_getpage_gfp' 'ext4_has_free_clusters' 'shmem_file_read_iter' 'copy_process' 'ext4_free_inodes_count' 'do_exit' '__process_echoes' 'tick_nohz_idle_stop_tick' 'writeback_sb_inodes' 'mod_timer' 'xas_clear_mark' 'echo_char' 'ext4_nonda_switch' 'tick_sched_do_timer' 'yama_ptracer_del' '__add_to_page_cache_locked'
[ 264.438522][ C0] ==================================================================
[ 264.446702][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 264.455087][ C0]
[ 264.457400][ C0] write to 0xffff88812c11dbe4 of 1 bytes by task 0 on cpu 1:
[ 264.464757][ C0] timer_clear_idle+0x3d/0x50
[ 264.469429][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 264.475307][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 264.480408][ C0] do_idle+0xac/0x290
[ 264.484376][ C0] cpu_startup_entry+0x14/0x20
[ 264.489123][ C0] start_secondary+0x164/0x1b0
[ 264.493877][ C0] secondary_startup_64+0xa4/0xb0
[ 264.498879][ C0]
[ 264.501197][ C0] read to 0xffff88812c11dbe4 of 1 bytes by interrupt on cpu 0:
[ 264.508727][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 264.514275][ C0] mod_timer+0x3d7/0x830
[ 264.518523][ C0] sk_reset_timer+0x29/0xc0
[ 264.523010][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 264.528254][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 264.533374][ C0] tcp_rcv_established+0x72b/0xee0
[ 264.538472][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 264.543050][ C0] tcp_v4_rcv+0x1bbf/0x1d80
[ 264.547544][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 264.552903][ C0] ip_local_deliver_finish+0xf3/0x120
[ 264.558310][ C0] ip_local_deliver+0x135/0x220
[ 264.563142][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 264.568328][ C0] ip_sublist_rcv+0x3f8/0x530
[ 264.572994][ C0] ip_list_rcv+0x2f3/0x321
[ 264.577392][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 264.583386][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 264.589523][ C0] gro_normal_list.part.0+0x37/0xa0
[ 264.594713][ C0] napi_complete_done+0x1d3/0x3a0
[ 264.599744][ C0] virtqueue_napi_complete+0x36/0xa0
[ 264.605056][ C0] virtnet_poll+0x771/0x790
[ 264.609553][ C0] net_rx_action+0x3ad/0xac0
[ 264.614170][ C0] __do_softirq+0x118/0x34a
[ 264.618664][ C0] irq_exit+0xb5/0xd0
[ 264.622643][ C0] do_IRQ+0x7b/0x120
[ 264.626534][ C0] ret_from_intr+0x0/0x21
[ 264.630854][ C0] native_safe_halt+0xe/0x10
[ 264.635434][ C0] default_idle+0x21/0x170
[ 264.639838][ C0] do_idle+0x1b7/0x290
[ 264.643896][ C0] cpu_startup_entry+0x14/0x20
[ 264.648642][ C0] rest_init+0xe4/0xeb
[ 264.652701][ C0] arch_call_rest_init+0x13/0x2b
[ 264.657619][ C0] start_kernel+0xcc2/0xceb
[ 264.662108][ C0] secondary_startup_64+0xa4/0xb0
[ 264.667107][ C0]
[ 264.669420][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 264.675561][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[ 264.683437][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 264.693638][ C0] ==================================================================
[ 264.701685][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 264.708267][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0-rc1-syzkaller #0
[ 264.716142][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 264.726176][ C0] Call Trace:
[ 264.729442][ C0]
[ 264.732285][ C0] dump_stack+0x11d/0x187
[ 264.736605][ C0] panic+0x210/0x640
[ 264.740488][ C0] ? vprintk_func+0x89/0x13a
[ 264.745071][ C0] kcsan_report.cold+0xc/0x14
[ 264.749745][ C0] kcsan_setup_watchpoint+0x304/0x400
[ 264.755113][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 264.760676][ C0] mod_timer+0x3d7/0x830
[ 264.764969][ C0] sk_reset_timer+0x29/0xc0
[ 264.769459][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 264.774652][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 264.779747][ C0] ? constant_test_bit+0xd/0x30
[ 264.784589][ C0] tcp_rcv_established+0x72b/0xee0
[ 264.789731][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 264.794309][ C0] tcp_v4_rcv+0x1bbf/0x1d80
[ 264.798816][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 264.804183][ C0] ip_local_deliver_finish+0xf3/0x120
[ 264.809543][ C0] ip_local_deliver+0x135/0x220
[ 264.814384][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 264.820017][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 264.825255][ C0] ip_sublist_rcv+0x3f8/0x530
[ 264.829927][ C0] ? ip_sublist_rcv+0x530/0x530
[ 264.834764][ C0] ip_list_rcv+0x2f3/0x321
[ 264.839181][ C0] ? ip_rcv+0x1b0/0x1b0
[ 264.843335][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 264.849300][ C0] ? ktime_get_with_offset+0x1e6/0x230
[ 264.854755][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 264.860898][ C0] ? receive_buf+0x25d/0x2e20
[ 264.865563][ C0] gro_normal_list.part.0+0x37/0xa0
[ 264.870752][ C0] napi_complete_done+0x1d3/0x3a0
[ 264.875763][ C0] ? virtqueue_enable_cb_prepare+0x19b/0x2a0
[ 264.881733][ C0] virtqueue_napi_complete+0x36/0xa0
[ 264.887032][ C0] virtnet_poll+0x771/0x790
[ 264.891537][ C0] net_rx_action+0x3ad/0xac0
[ 264.896116][ C0] __do_softirq+0x118/0x34a
[ 264.900614][ C0] irq_exit+0xb5/0xd0
[ 264.904589][ C0] do_IRQ+0x7b/0x120
[ 264.908468][ C0] common_interrupt+0xf/0xf
[ 264.912948][ C0]
[ 264.915873][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 264.921231][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d fc 08 44 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d ec 08 44 00 fb f4 cc 41 54 55 53 e8 a7 fd 9a fc e8 12 ae b3 fd 0f 1f 44 00 00 48
[ 264.940822][ C0] RSP: 0018:ffffffff85a03e50 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 264.949228][ C0] RAX: 0000000000000000 RBX: ffffffff85a2b840 RCX: ffffffff82521f51
[ 264.957188][ C0] RDX: 0000000000000000 RSI: ffffffff82521f5a RDI: 0000000000000005
[ 264.965189][ C0] RBP: 0000000000000000 R08: ffffffff85a2b840 R09: 0000ffff8584b160
[ 264.973143][ C0] R10: 0000ffff85a03e38 R11: 0000ffff8584b167 R12: ffffffff85a2b840
[ 264.981095][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85a2b840
[ 264.989069][ C0] ? debug_smp_processor_id+0x31/0x129
[ 264.994510][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 264.999961][ C0] default_idle+0x21/0x170
[ 265.004390][ C0] do_idle+0x1b7/0x290
[ 265.008443][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 265.013899][ C0] cpu_startup_entry+0x14/0x20
[ 265.018655][ C0] rest_init+0xe4/0xeb
[ 265.022717][ C0] arch_call_rest_init+0x13/0x2b
[ 265.027647][ C0] start_kernel+0xcc2/0xceb
[ 265.032135][ C0] secondary_startup_64+0xa4/0xb0
[ 265.038395][ C0] Kernel Offset: disabled
[ 265.042713][ C0] Rebooting in 86400 seconds..