[[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 '10.128.0.243' (ECDSA) to the list of known hosts.
2020/04/28 06:36:04 fuzzer started
2020/04/28 06:36:06 dialing manager at 10.128.0.105:35849
2020/04/28 06:36:07 syscalls: 2960
2020/04/28 06:36:07 code coverage: enabled
2020/04/28 06:36:07 comparison tracing: enabled
2020/04/28 06:36:07 extra coverage: enabled
2020/04/28 06:36:07 setuid sandbox: enabled
2020/04/28 06:36:07 namespace sandbox: enabled
2020/04/28 06:36:07 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/28 06:36:07 fault injection: enabled
2020/04/28 06:36:07 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/28 06:36:07 net packet injection: enabled
2020/04/28 06:36:07 net device setup: enabled
2020/04/28 06:36:07 concurrency sanitizer: enabled
2020/04/28 06:36:07 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/28 06:36:07 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [ 46.329024][ T6730] KCSAN: could not find function: 'calc_wb_limits'
[ 47.838201][ T6730] KCSAN: could not find function: '_find_next_bit'
[ 51.500101][ T6730] KCSAN: could not find function: 'poll_schedule_timeout'
2020/04/28 06:36:15 adding functions to KCSAN blacklist: 'ext4_da_write_end' 'blk_mq_sched_dispatch_requests' 'commit_echoes' 'hrtimer_interrupt' '__mark_inode_dirty' 'exit_signals' 'ext4_setattr' 'copy_process' 'ext4_mb_good_group' 'af_alg_sendmsg' 'file_remove_privs' 'calc_wb_limits' '__filemap_fdatawrite_range' 'get_signal' 'pipe_double_lock' 'page_counter_charge' 'blk_mq_get_request' 'dd_has_work' 'echo_char' 'audit_log_start' 'filemap_fault' 'mod_timer' 'generic_write_end' 'blk_mq_dispatch_rq_list' '_find_next_bit' 'ktime_get_seconds' 'ext4_sync_file' 'ktime_get_real_seconds' 'do_signal_stop' '__add_to_page_cache_locked' 'shmem_add_to_page_cache' 'do_nanosleep' '__x64_sys_ptrace' 'step_into' 'generic_file_read_iter' '__snd_rawmidi_transmit_ack' 'atime_needs_update' 'dec_zone_page_state' 'ext4_free_inodes_count' 'tick_sched_do_timer' 'do_syslog' '__bpf_lru_node_move_in' 'add_timer' 'find_get_pages_range_tag' 'run_timer_softirq' 'futex_wait_queue_me' '__get_user_pages' '__dentry_kill' 'lo_ioctl' '__rcu_read_unlock' '__delete_from_page_cache' 'n_tty_receive_char_special' 'sit_tunnel_xmit' 'ext4_mb_find_by_goal' 'other_inode_match' 'tick_nohz_idle_stop_tick' 'generic_fillattr' 'wbt_done' 'wbt_issue' 'poll_schedule_timeout' 'netlink_getname' 'mnt_clone_write' '__put_unused_fd' 'ep_poll' '__d_instantiate' 'ext4_mark_iloc_dirty' 'snd_seq_check_queue' 'blk_mq_request_bypass_insert' 'n_tty_receive_buf_common' 'blk_mq_free_request' 'pcpu_alloc' 'xas_clear_mark' 'kauditd_thread' 'vm_area_dup' 'io_sq_thread' '__ext4_new_inode' 'do_exit' '__find_get_block' 'ext4_writepages' 'xas_find_marked' 'kvm_mmu_notifier_invalidate_range_end'
[ 137.821024][ C0] ==================================================================
[ 137.829186][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 137.837567][ C0]
[ 137.839916][ C0] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1:
[ 137.847260][ C0] timer_clear_idle+0x3d/0x50
[ 137.851959][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 137.857877][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 137.862965][ C0] do_idle+0xac/0x290
[ 137.866920][ C0] cpu_startup_entry+0x14/0x20
[ 137.871658][ C0] start_secondary+0x169/0x1b0
[ 137.876396][ C0] secondary_startup_64+0xa4/0xb0
[ 137.881385][ C0]
[ 137.883706][ C0] read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0:
[ 137.891240][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 137.896809][ C0] mod_timer+0x50e/0x830
[ 137.901027][ C0] sk_reset_timer+0x29/0xc0
[ 137.905512][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 137.910688][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 137.915796][ C0] tcp_rcv_established+0x72b/0xee0
[ 137.920925][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 137.925489][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 137.929968][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 137.935314][ C0] ip_local_deliver_finish+0xf3/0x120
[ 137.940706][ C0] ip_local_deliver+0x135/0x220
[ 137.945550][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 137.950733][ C0] ip_sublist_rcv+0x3f8/0x530
[ 137.955393][ C0] ip_list_rcv+0x2f3/0x321
[ 137.959789][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 137.965749][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 137.971876][ C0] gro_normal_list.part.0+0x37/0xa0
[ 137.977064][ C0] napi_complete_done+0x1d3/0x3a0
[ 137.982063][ C0] virtqueue_napi_complete+0x36/0xa0
[ 137.987322][ C0] virtnet_poll+0x771/0x790
[ 137.991799][ C0] net_rx_action+0x3ad/0xac0
[ 137.996383][ C0] __do_softirq+0x118/0x34a
[ 138.000862][ C0] irq_exit+0xb5/0xd0
[ 138.004820][ C0] do_IRQ+0x7b/0x120
[ 138.008697][ C0] ret_from_intr+0x0/0x21
[ 138.013003][ C0] native_safe_halt+0xe/0x10
[ 138.017567][ C0] default_idle+0x21/0x170
[ 138.021955][ C0] do_idle+0x1b7/0x290
[ 138.026006][ C0] cpu_startup_entry+0x14/0x20
[ 138.030744][ C0] rest_init+0xe4/0xeb
[ 138.034805][ C0] arch_call_rest_init+0x13/0x2b
[ 138.039722][ C0] start_kernel+0x82d/0x852
[ 138.044202][ C0] secondary_startup_64+0xa4/0xb0
[ 138.049194][ C0]
[ 138.051494][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 138.058664][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 138.066526][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 138.076558][ C0] ==================================================================
[ 138.084601][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 138.091185][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 138.099087][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 138.109117][ C0] Call Trace:
[ 138.112416][ C0]
[ 138.115252][ C0] dump_stack+0x11d/0x187
[ 138.119562][ C0] panic+0x210/0x640
[ 138.123439][ C0] ? vprintk_func+0x89/0x13a
[ 138.128010][ C0] kcsan_report.cold+0xc/0x1a
[ 138.132667][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 138.138027][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 138.143554][ C0] mod_timer+0x50e/0x830
[ 138.147788][ C0] sk_reset_timer+0x29/0xc0
[ 138.152274][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 138.157451][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 138.162543][ C0] ? constant_test_bit+0xd/0x30
[ 138.167380][ C0] tcp_rcv_established+0x72b/0xee0
[ 138.172474][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 138.177041][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 138.181552][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 138.186923][ C0] ip_local_deliver_finish+0xf3/0x120
[ 138.192283][ C0] ip_local_deliver+0x135/0x220
[ 138.197112][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 138.202736][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 138.207942][ C0] ip_sublist_rcv+0x3f8/0x530
[ 138.212601][ C0] ? ip_sublist_rcv+0x530/0x530
[ 138.217547][ C0] ip_list_rcv+0x2f3/0x321
[ 138.221941][ C0] ? ip_rcv+0x1b0/0x1b0
[ 138.226093][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 138.232064][ C0] ? gro_normal_one+0x120/0x160
[ 138.236895][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 138.243037][ C0] ? receive_buf+0x261/0x2ed0
[ 138.247699][ C0] gro_normal_list.part.0+0x37/0xa0
[ 138.252880][ C0] napi_complete_done+0x1d3/0x3a0
[ 138.257885][ C0] ? virtqueue_enable_cb_prepare+0x19b/0x2a0
[ 138.263862][ C0] virtqueue_napi_complete+0x36/0xa0
[ 138.269132][ C0] virtnet_poll+0x771/0x790
[ 138.273622][ C0] net_rx_action+0x3ad/0xac0
[ 138.278198][ C0] __do_softirq+0x118/0x34a
[ 138.282687][ C0] irq_exit+0xb5/0xd0
[ 138.286668][ C0] do_IRQ+0x7b/0x120
[ 138.290537][ C0] common_interrupt+0xf/0xf
[ 138.295025][ C0]
[ 138.297946][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 138.303314][ 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
[ 138.322896][ C0] RSP: 0018:ffffffff85c03e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 138.331284][ C0] RAX: 0000000000000000 RBX: ffffffff85c2b840 RCX: ffffffff82561ff1
[ 138.339230][ C0] RDX: 0000000000000000 RSI: ffffffff82561ffa RDI: 0000000000000005
[ 138.347186][ C0] RBP: 0000000000000000 R08: ffffffff85c2b840 R09: 0000ffff85a6c920
[ 138.355150][ C0] R10: 0000ffff85c03e58 R11: 0000ffff85a6c927 R12: ffffffff85c2b840
[ 138.363116][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85c2b840
[ 138.371076][ C0] ? debug_smp_processor_id+0x31/0x129
[ 138.376516][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 138.381948][ C0] default_idle+0x21/0x170
[ 138.386353][ C0] do_idle+0x1b7/0x290
[ 138.390411][ C0] ? do_idle+0xe0/0x290
[ 138.394562][ C0] cpu_startup_entry+0x14/0x20
[ 138.399322][ C0] rest_init+0xe4/0xeb
[ 138.403373][ C0] arch_call_rest_init+0x13/0x2b
[ 138.408307][ C0] start_kernel+0x82d/0x852
[ 138.412793][ C0] secondary_startup_64+0xa4/0xb0
[ 138.419053][ C0] Kernel Offset: disabled
[ 138.423394][ C0] Rebooting in 86400 seconds..