[[0;32m OK [0m] Reached target Login Prompts.
[[0;32m OK [0m] Reached target Multi-User System.
[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.74' (ECDSA) to the list of known hosts.
2020/05/03 02:22:34 fuzzer started
2020/05/03 02:22:35 dialing manager at 10.128.0.105:41005
2020/05/03 02:23:07 syscalls: 2964
2020/05/03 02:23:07 code coverage: enabled
2020/05/03 02:23:07 comparison tracing: enabled
2020/05/03 02:23:07 extra coverage: enabled
2020/05/03 02:23:07 setuid sandbox: enabled
2020/05/03 02:23:07 namespace sandbox: enabled
2020/05/03 02:23:07 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/03 02:23:07 fault injection: enabled
2020/05/03 02:23:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/03 02:23:07 net packet injection: enabled
2020/05/03 02:23:07 net device setup: enabled
2020/05/03 02:23:07 concurrency sanitizer: enabled
2020/05/03 02:23:07 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/03 02:23:07 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [ 77.108779][ T6727] KCSAN: could not find function: '_find_next_bit'
[ 78.431990][ T6727] KCSAN: could not find function: 'poll_schedule_timeout'
2020/05/03 02:23:12 adding functions to KCSAN blacklist: 'fsnotify' 'ext4_free_inodes_count' 'shmem_add_to_page_cache' '_find_next_bit' '__snd_rawmidi_transmit_ack' 'generic_write_end' 'tick_sched_do_timer' 'alloc_pid' 'mod_timer' 'add_timer' 'xas_clear_mark' 'wbt_done' 'poll_schedule_timeout' 'do_nanosleep' 'tick_nohz_idle_stop_tick' 'wbt_wait' 'blk_mq_sched_dispatch_requests' '__writeback_single_inode' '__ext4_new_inode' 'blk_mq_get_request' '__dentry_kill' 'find_alive_thread' 'run_timer_softirq' 'dd_has_work' 'echo_char' 'copy_process' 'ext4_mark_iloc_dirty' 'xas_find_marked' 'vm_area_dup' 'do_syslog' 'blk_mq_dispatch_rq_list' 'page_counter_charge' 'find_get_pages_range_tag' 'ep_poll' 'generic_fillattr'
[ 199.813304][ C0] ==================================================================
[ 199.821442][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 199.829846][ C0]
[ 199.832183][ C0] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1:
[ 199.839875][ C0] timer_clear_idle+0x3d/0x50
[ 199.844530][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 199.850398][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 199.855574][ C0] do_idle+0xac/0x290
[ 199.859534][ C0] cpu_startup_entry+0x14/0x20
[ 199.864285][ C0] start_secondary+0x169/0x1b0
[ 199.869041][ C0] secondary_startup_64+0xa4/0xb0
[ 199.874124][ C0]
[ 199.876434][ C0] read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0:
[ 199.884042][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 199.889570][ C0] mod_timer+0x3d7/0x830
[ 199.895181][ C0] sk_reset_timer+0x29/0xc0
[ 199.899664][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 199.904854][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 199.909940][ C0] tcp_rcv_established+0x72b/0xee0
[ 199.915039][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 199.919710][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 199.924226][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 199.929580][ C0] ip_local_deliver_finish+0xf3/0x120
[ 199.934964][ C0] ip_local_deliver+0x135/0x220
[ 199.939809][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 199.944984][ C0] ip_sublist_rcv+0x3f8/0x530
[ 199.949647][ C0] ip_list_rcv+0x2f3/0x321
[ 199.954046][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 199.960026][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 199.966356][ C0] gro_normal_list.part.0+0x37/0xa0
[ 199.971915][ C0] gro_normal_one+0x14c/0x160
[ 199.976568][ C0] napi_gro_receive+0x27d/0x2f0
[ 199.981403][ C0] receive_buf+0x252/0x2ed0
[ 199.985889][ C0] virtnet_poll+0x343/0x790
[ 199.990367][ C0] net_rx_action+0x3ad/0xac0
[ 199.994934][ C0] __do_softirq+0x118/0x34a
[ 199.999421][ C0] irq_exit+0xb5/0xd0
[ 200.003382][ C0] do_IRQ+0x7b/0x120
[ 200.007265][ C0] ret_from_intr+0x0/0x21
[ 200.011588][ C0] native_safe_halt+0xe/0x10
[ 200.016163][ C0] default_idle+0x21/0x170
[ 200.020826][ C0] do_idle+0x1b7/0x290
[ 200.024899][ C0] cpu_startup_entry+0x14/0x20
[ 200.029669][ C0] rest_init+0xe4/0xeb
[ 200.033764][ C0] arch_call_rest_init+0x13/0x2b
[ 200.038695][ C0] start_kernel+0x82d/0x852
[ 200.043196][ C0] secondary_startup_64+0xa4/0xb0
[ 200.048728][ C0]
[ 200.051034][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 200.059619][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 200.067490][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 200.077530][ C0] ==================================================================
[ 200.085600][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 200.092181][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 200.100039][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 200.110070][ C0] Call Trace:
[ 200.113327][ C0]
[ 200.116868][ C0] dump_stack+0x11d/0x187
[ 200.121179][ C0] panic+0x210/0x640
[ 200.125139][ C0] ? vprintk_func+0x89/0x13a
[ 200.129732][ C0] kcsan_report.cold+0xc/0x1a
[ 200.134588][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 200.139958][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 200.145932][ C0] mod_timer+0x3d7/0x830
[ 200.150171][ C0] sk_reset_timer+0x29/0xc0
[ 200.154758][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 200.159949][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 200.165063][ C0] ? constant_test_bit+0xd/0x30
[ 200.170002][ C0] tcp_rcv_established+0x72b/0xee0
[ 200.175240][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 200.179823][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 200.184336][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 200.189709][ C0] ip_local_deliver_finish+0xf3/0x120
[ 200.195064][ C0] ip_local_deliver+0x135/0x220
[ 200.199898][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 200.205509][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 200.210772][ C0] ip_sublist_rcv+0x3f8/0x530
[ 200.215429][ C0] ? ip_sublist_rcv+0x530/0x530
[ 200.220255][ C0] ip_list_rcv+0x2f3/0x321
[ 200.224648][ C0] ? ip_rcv+0x1b0/0x1b0
[ 200.230898][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 200.236872][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 200.243021][ C0] gro_normal_list.part.0+0x37/0xa0
[ 200.248375][ C0] ? __write_once_size+0x7c/0x100
[ 200.255999][ C0] gro_normal_one+0x14c/0x160
[ 200.260677][ C0] napi_gro_receive+0x27d/0x2f0
[ 200.265507][ C0] receive_buf+0x252/0x2ed0
[ 200.270013][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0
[ 200.275450][ C0] virtnet_poll+0x343/0x790
[ 200.279934][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x70/0xa0
[ 200.285895][ C0] net_rx_action+0x3ad/0xac0
[ 200.290469][ C0] __do_softirq+0x118/0x34a
[ 200.294953][ C0] irq_exit+0xb5/0xd0
[ 200.298915][ C0] do_IRQ+0x7b/0x120
[ 200.302794][ C0] common_interrupt+0xf/0xf
[ 200.307287][ C0]
[ 200.310207][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 200.315556][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 1c be 57 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 0c be 57 00 fb f4 cc 41 54 55 53 e8 97 f1 8e fc e8 b2 58 ab fd 0f 1f 44 00 00 48
[ 200.335132][ C0] RSP: 0018:ffffffff85c03e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 200.343518][ C0] RAX: 0000000000000000 RBX: ffffffff85c2b840 RCX: ffffffff82561ff1
[ 200.351465][ C0] RDX: 0000000000000000 RSI: ffffffff82561ffa RDI: 0000000000000005
[ 200.359510][ C0] RBP: 0000000000000000 R08: ffffffff85c2b840 R09: 0000ffff85a6c920
[ 200.367922][ C0] R10: 0000ffff85c03e58 R11: 0000ffff85a6c927 R12: ffffffff85c2b840
[ 200.376150][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85c2b840
[ 200.384138][ C0] ? debug_smp_processor_id+0x31/0x129
[ 200.389581][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 200.395035][ C0] default_idle+0x21/0x170
[ 200.399529][ C0] do_idle+0x1b7/0x290
[ 200.403646][ C0] ? debug_smp_processor_id+0x3f/0x129
[ 200.409107][ C0] cpu_startup_entry+0x14/0x20
[ 200.413880][ C0] rest_init+0xe4/0xeb
[ 200.417936][ C0] arch_call_rest_init+0x13/0x2b
[ 200.422858][ C0] start_kernel+0x82d/0x852
[ 200.427444][ C0] secondary_startup_64+0xa4/0xb0
[ 200.434009][ C0] Kernel Offset: disabled
[ 200.438362][ C0] Rebooting in 86400 seconds..