[[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 '10.128.1.30' (ECDSA) to the list of known hosts.
2020/05/14 23:57:21 fuzzer started
2020/05/14 23:57:22 dialing manager at 10.128.0.105:44163
2020/05/14 23:57:22 syscalls: 3055
2020/05/14 23:57:22 code coverage: enabled
2020/05/14 23:57:22 comparison tracing: enabled
2020/05/14 23:57:22 extra coverage: enabled
2020/05/14 23:57:22 setuid sandbox: enabled
2020/05/14 23:57:22 namespace sandbox: enabled
2020/05/14 23:57:22 Android sandbox: /sys/fs/selinux/policy does not exist
2020/05/14 23:57:22 fault injection: enabled
2020/05/14 23:57:22 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/05/14 23:57:22 net packet injection: enabled
2020/05/14 23:57:22 net device setup: enabled
2020/05/14 23:57:22 concurrency sanitizer: enabled
2020/05/14 23:57:22 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/05/14 23:57:22 USB emulation: enabled
syzkaller login: [ 50.687613][ T8918] KCSAN: could not find function: '_find_next_bit'
[ 51.282119][ T8918] KCSAN: could not find function: 'poll_schedule_timeout'
2020/05/14 23:57:29 adding functions to KCSAN blacklist: 'direct_page_fault' 'echo_char' 'tick_nohz_next_event' 'pcpu_alloc' 'wbt_wait' '__filemap_fdatawrite_range' 'exit_signals' 'add_timer' 'shmem_file_read_iter' 'blk_mq_get_request' '__add_to_page_cache_locked' 'blk_mq_sched_dispatch_requests' 'xas_find_marked' 'blk_mq_dispatch_rq_list' 'do_nanosleep' 'tick_sched_do_timer' 'ktime_get_seconds' 'wbt_done' 'commit_echoes' '__delete_from_page_cache' 'mounts_open_common' 'do_syslog' 'ep_poll' 'do_signal_stop' 'ext4_da_write_end' '__get_user_pages' 'do_exit' '_find_next_bit' 'poll_schedule_timeout' 'ext4_mb_good_group' 'ext4_mb_find_by_goal' 'ktime_get_real_seconds' '__snd_rawmidi_transmit_ack' 'lruvec_lru_size' 'page_counter_charge' '__perf_event_overflow' 'audit_log_start' 'vm_area_dup' '__ext4_new_inode' 'generic_write_end' 'ext4_mark_iloc_dirty' 'dccp_rcv_reset' 'yama_ptracer_del' 'alloc_pid' 'schedule_hrtimeout_range_clock' 'dd_has_work' 'ext4_writepages' '__x64_sys_ptrace' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'kauditd_thread' 'shmem_getpage_gfp' 'copy_process' 'perf_event_wakeup' 'delete_from_page_cache_batch' 'find_get_pages_range_tag' '__synchronize_hardirq' 'mod_timer' 'run_timer_softirq' 'generic_fillattr' 'n_tty_receive_buf_common' 'futex_wait_queue_me' 'do_readlinkat'
[ 131.164276][ C0] ==================================================================
[ 131.172447][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 131.180857][ C0]
[ 131.183163][ C0] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1:
[ 131.190617][ C0] timer_clear_idle+0x3d/0x50
[ 131.195264][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 131.201127][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 131.206214][ C0] do_idle+0xac/0x290
[ 131.210196][ C0] cpu_startup_entry+0x14/0x20
[ 131.214929][ C0] start_secondary+0x169/0x1b0
[ 131.219768][ C0] secondary_startup_64+0xa4/0xb0
[ 131.224756][ C0]
[ 131.227056][ C0] read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0:
[ 131.234573][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 131.240104][ C0] mod_timer+0x50e/0x830
[ 131.244317][ C0] sk_reset_timer+0x29/0xc0
[ 131.248822][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 131.253990][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 131.259090][ C0] tcp_rcv_established+0x72b/0xee0
[ 131.264185][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 131.268832][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 131.273305][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 131.278666][ C0] ip_local_deliver_finish+0xf3/0x120
[ 131.284030][ C0] ip_local_deliver+0x135/0x220
[ 131.288871][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 131.294050][ C0] ip_sublist_rcv+0x3f8/0x530
[ 131.298694][ C0] ip_list_rcv+0x2f3/0x321
[ 131.303080][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 131.309038][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 131.315286][ C0] gro_normal_list.part.0+0x37/0xa0
[ 131.320453][ C0] gro_normal_one+0x14c/0x160
[ 131.325100][ C0] napi_gro_receive+0x27d/0x2f0
[ 131.329960][ C0] receive_buf+0x24c/0x3420
[ 131.334436][ C0] virtnet_poll+0x343/0x790
[ 131.338941][ C0] net_rx_action+0x3ad/0xac0
[ 131.343535][ C0] __do_softirq+0x118/0x34a
[ 131.348011][ C0] irq_exit+0xb5/0xd0
[ 131.351978][ C0] do_IRQ+0x7b/0x120
[ 131.355864][ C0] ret_from_intr+0x0/0x21
[ 131.360164][ C0] native_safe_halt+0xe/0x10
[ 131.364722][ C0] default_idle+0x21/0x170
[ 131.369110][ C0] do_idle+0x1b7/0x290
[ 131.373150][ C0] cpu_startup_entry+0x14/0x20
[ 131.377888][ C0] rest_init+0xe4/0xeb
[ 131.381938][ C0] arch_call_rest_init+0x13/0x2b
[ 131.386848][ C0] start_kernel+0x7fe/0x823
[ 131.391326][ C0] secondary_startup_64+0xa4/0xb0
[ 131.396317][ C0]
[ 131.398619][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 131.404769][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 131.412638][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 131.422664][ C0] ==================================================================
[ 131.430694][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 131.437254][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 131.445121][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 131.455142][ C0] Call Trace:
[ 131.458397][ C0]
[ 131.461224][ C0] dump_stack+0x11d/0x187
[ 131.465567][ C0] panic+0x210/0x640
[ 131.469436][ C0] ? vprintk_func+0x89/0x13a
[ 131.474000][ C0] kcsan_report.cold+0xc/0x1a
[ 131.478652][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 131.484010][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 131.489529][ C0] mod_timer+0x50e/0x830
[ 131.493748][ C0] sk_reset_timer+0x29/0xc0
[ 131.498228][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 131.503418][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 131.508496][ C0] ? constant_test_bit+0xd/0x30
[ 131.513335][ C0] tcp_rcv_established+0x72b/0xee0
[ 131.518425][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 131.523005][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 131.527491][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 131.532833][ C0] ip_local_deliver_finish+0xf3/0x120
[ 131.538188][ C0] ip_local_deliver+0x135/0x220
[ 131.543026][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 131.548645][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 131.553819][ C0] ip_sublist_rcv+0x3f8/0x530
[ 131.558490][ C0] ? ip_sublist_rcv+0x530/0x530
[ 131.563317][ C0] ip_list_rcv+0x2f3/0x321
[ 131.567726][ C0] ? ip_rcv+0x1b0/0x1b0
[ 131.571875][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 131.577832][ C0] ? ktime_get_with_offset+0x1e6/0x230
[ 131.583279][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 131.589407][ C0] gro_normal_list.part.0+0x37/0xa0
[ 131.594577][ C0] ? __write_once_size+0x7c/0x100
[ 131.599594][ C0] gro_normal_one+0x14c/0x160
[ 131.604271][ C0] napi_gro_receive+0x27d/0x2f0
[ 131.609095][ C0] receive_buf+0x24c/0x3420
[ 131.613576][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0
[ 131.619009][ C0] virtnet_poll+0x343/0x790
[ 131.623493][ C0] net_rx_action+0x3ad/0xac0
[ 131.628067][ C0] __do_softirq+0x118/0x34a
[ 131.632558][ C0] irq_exit+0xb5/0xd0
[ 131.636512][ C0] do_IRQ+0x7b/0x120
[ 131.640396][ C0] common_interrupt+0xf/0xf
[ 131.644862][ C0]
[ 131.647791][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 131.653141][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 0c d6 58 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d fc d5 58 00 fb f4 cc 41 54 55 53 e8 97 b2 71 fb e8 a2 21 bc fc 0f 1f 44 00 00 48
[ 131.672736][ C0] RSP: 0018:ffffffff87203e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 131.681115][ C0] RAX: 0000000000000000 RBX: ffffffff8722b840 RCX: ffffffff8285fdf1
[ 131.689056][ C0] RDX: 0000000000000000 RSI: ffffffff8285fdfa RDI: 0000000000000005
[ 131.697000][ C0] RBP: 0000000000000000 R08: ffffffff8722b840 R09: 0000ffff87047920
[ 131.704945][ C0] R10: 0000ffff87203e58 R11: 0000ffff87047927 R12: ffffffff8722b840
[ 131.712892][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8722b840
[ 131.720840][ C0] ? debug_smp_processor_id+0x31/0x129
[ 131.726269][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 131.731700][ C0] default_idle+0x21/0x170
[ 131.736089][ C0] do_idle+0x1b7/0x290
[ 131.740129][ C0] ? debug_smp_processor_id+0x3f/0x129
[ 131.745567][ C0] cpu_startup_entry+0x14/0x20
[ 131.750316][ C0] rest_init+0xe4/0xeb
[ 131.754372][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe
[ 131.760581][ C0] arch_call_rest_init+0x13/0x2b
[ 131.765487][ C0] start_kernel+0x7fe/0x823
[ 131.769963][ C0] secondary_startup_64+0xa4/0xb0
[ 131.776302][ C0] Kernel Offset: disabled
[ 131.780615][ C0] Rebooting in 86400 seconds..