[[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 '10.128.10.11' (ECDSA) to the list of known hosts.
2020/12/22 11:54:16 fuzzer started
2020/12/22 11:54:17 dialing manager at 10.128.0.105:33859
2020/12/22 11:54:17 syscalls: 3466
2020/12/22 11:54:17 code coverage: enabled
2020/12/22 11:54:17 comparison tracing: enabled
2020/12/22 11:54:17 extra coverage: enabled
2020/12/22 11:54:17 setuid sandbox: enabled
2020/12/22 11:54:17 namespace sandbox: enabled
2020/12/22 11:54:17 Android sandbox: /sys/fs/selinux/policy does not exist
2020/12/22 11:54:17 fault injection: enabled
2020/12/22 11:54:17 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/12/22 11:54:17 net packet injection: enabled
2020/12/22 11:54:17 net device setup: enabled
2020/12/22 11:54:17 concurrency sanitizer: enabled
2020/12/22 11:54:17 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/12/22 11:54:17 USB emulation: enabled
2020/12/22 11:54:17 hci packet injection: enabled
2020/12/22 11:54:17 wifi device emulation: enabled
2020/12/22 11:54:23 suppressing KCSAN reports in functions: '__blkdev_put' '__xa_clear_mark' 'audit_log_start' 'do_sys_poll' '__find_get_block' 'xas_find_marked' 'ext4_mark_iloc_dirty' 'tick_nohz_next_event' 'shmem_getpage_gfp' 'step_into' 'handle_irq_event' 'kvm_mmu_notifier_invalidate_range_end' 'tick_sched_timer' 'ext4_writepages' 'lru_add_drain_all' 'generic_file_buffered_read' 'ext4_mb_good_group' 'futex_wait_queue_me' 'ext4_mb_find_by_goal' 'shmem_mknod' 'blk_mq_rq_ctx_init' '__add_to_page_cache_locked' 'ext4_mb_regular_allocator' 'btrfs_wait_block_group_cache_progress' '__percpu_counter_compare' 'nilfs_detach_log_writer' '__io_cqring_fill_event' 'kauditd_thread' 'compact_finished' '__delete_from_page_cache' '__xa_set_mark' 'exit_signals' 'ext4_setattr' 'expire_timers' 'find_get_pages_range_tag' '_prb_read_valid' 'iptunnel_xmit' 'shmem_symlink' 'wbt_wait' 'generic_write_end' 'bpf_lru_pop_free' 'exit_mm' '__filemap_fdatawrite_range' 'blk_mq_dispatch_rq_list' 'ext4_free_inode' '__writeback_single_inode' 'mark_buffer_dirty_inode' 'file_remove_privs' 'dput' 'do_nanosleep' 'ext4_free_inodes_count' 'wbt_done' 'shmem_unlink' 'n_tty_receive_buf_common' 'kcm_rfree' '__dentry_kill' 'pcpu_alloc' 'blk_mq_do_dispatch_sched' 'do_signal_stop' 'blk_mq_free_request' 'vfs_fsync_range' 'tomoyo_domain_quota_is_ok' 'wait_consider_task' '__ext4_new_inode' 'wg_packet_decrypt_worker' 'ext4_sync_file' 'ktime_get_real_seconds' 'data_alloc' 'blk_mq_sched_dispatch_requests' 'alloc_pid' 'wbt_issue' '__bpf_lru_list_rotate' 'do_select' '__ext4_update_other_inode_time' 'ext4_set_iomap' 'dd_has_work' '__mark_inode_dirty'
syzkaller login: [ 71.904030][ C0] ==================================================================
[ 71.912115][ C0] BUG: KCSAN: data-race in internal_add_timer / timer_clear_idle
[ 71.919857][ C0]
[ 71.922611][ C0] write to 0xffff88813bd1bda5 of 1 bytes by task 0 on cpu 1:
[ 71.929951][ C0] timer_clear_idle+0x1e/0x30
[ 71.935594][ C0] __tick_nohz_idle_restart_tick+0x20/0x170
[ 71.941728][ C0] tick_nohz_idle_exit+0xfc/0x210
[ 71.946728][ C0] do_idle+0x1f6/0x230
[ 71.950796][ C0] cpu_startup_entry+0x15/0x20
[ 71.955534][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 71.961409][ C0]
[ 71.963915][ C0] read to 0xffff88813bd1bda5 of 1 bytes by interrupt on cpu 0:
[ 71.971535][ C0] internal_add_timer+0x219/0x2a0
[ 71.977625][ C0] __mod_timer+0x789/0xbf0
[ 71.982173][ C0] mod_timer+0x1b/0x20
[ 71.986229][ C0] sk_reset_timer+0x1f/0xa0
[ 71.990722][ C0] tcp_send_delayed_ack+0x23e/0x250
[ 71.996019][ C0] __tcp_ack_snd_check+0x2f6/0x500
[ 72.001149][ C0] tcp_rcv_established+0x9cb/0x1450
[ 72.006424][ C0] tcp_v4_do_rcv+0x278/0x4a0
[ 72.010990][ C0] tcp_v4_rcv+0x2101/0x2370
[ 72.015467][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 72.020916][ C0] ip_local_deliver+0x1c0/0x280
[ 72.025743][ C0] ip_sublist_rcv+0x4c4/0x590
[ 72.030416][ C0] ip_list_rcv+0x262/0x290
[ 72.034808][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 72.040783][ C0] __netif_receive_skb_list+0x262/0x2e0
[ 72.046302][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 72.052349][ C0] napi_complete_done+0x1b2/0x420
[ 72.057362][ C0] virtqueue_napi_complete+0x28/0x80
[ 72.062623][ C0] virtnet_poll+0x607/0x730
[ 72.067119][ C0] napi_poll+0x181/0x630
[ 72.071351][ C0] net_rx_action+0x17a/0x480
[ 72.075932][ C0] __do_softirq+0x13c/0x2c3
[ 72.080424][ C0] asm_call_irq_on_stack+0xf/0x20
[ 72.085525][ C0] do_softirq_own_stack+0x32/0x40
[ 72.090525][ C0] __irq_exit_rcu+0xb4/0xc0
[ 72.095006][ C0] common_interrupt+0xb5/0x130
[ 72.099745][ C0] asm_common_interrupt+0x1e/0x40
[ 72.104742][ C0] acpi_idle_enter+0x25b/0x2e0
[ 72.109581][ C0] cpuidle_enter_state+0x2bd/0x750
[ 72.114773][ C0] cpuidle_enter+0x3c/0x60
[ 72.119169][ C0] do_idle+0x193/0x230
[ 72.123230][ C0] cpu_startup_entry+0x15/0x20
[ 72.127977][ C0] rest_init+0xd7/0xe0
[ 72.132020][ C0] arch_call_rest_init+0xa/0xb
[ 72.136758][ C0] start_kernel+0x59b/0x620
[ 72.141243][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 72.147126][ C0]
[ 72.149448][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 72.155566][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-syzkaller #0
[ 72.164258][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 72.176343][ C0] ==================================================================
[ 72.184380][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 72.190945][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-syzkaller #0
[ 72.198558][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 72.208597][ C0] Call Trace:
[ 72.211856][ C0]
[ 72.215701][ C0] dump_stack+0x116/0x15d
[ 72.223937][ C0] panic+0x1e7/0x5fa
[ 72.227823][ C0] ? vprintk_emit+0x2e2/0x360
[ 72.232524][ C0] kcsan_report+0x67b/0x680
[ 72.237005][ C0] ? kcsan_setup_watchpoint+0x47b/0x4e0
[ 72.242621][ C0] ? internal_add_timer+0x219/0x2a0
[ 72.248246][ C0] ? __mod_timer+0x789/0xbf0
[ 72.252815][ C0] ? mod_timer+0x1b/0x20
[ 72.257048][ C0] ? sk_reset_timer+0x1f/0xa0
[ 72.261977][ C0] ? tcp_send_delayed_ack+0x23e/0x250
[ 72.267322][ C0] ? __tcp_ack_snd_check+0x2f6/0x500
[ 72.272584][ C0] ? tcp_rcv_established+0x9cb/0x1450
[ 72.277953][ C0] ? tcp_v4_do_rcv+0x278/0x4a0
[ 72.282691][ C0] ? tcp_v4_rcv+0x2101/0x2370
[ 72.287354][ C0] ? ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 72.292964][ C0] ? ip_local_deliver+0x1c0/0x280
[ 72.297981][ C0] ? ip_sublist_rcv+0x4c4/0x590
[ 72.302803][ C0] ? ip_list_rcv+0x262/0x290
[ 72.307368][ C0] ? __netif_receive_skb_list_core+0x34b/0x450
[ 72.313514][ C0] ? __netif_receive_skb_list+0x262/0x2e0
[ 72.319299][ C0] ? netif_receive_skb_list_internal+0xda/0x330
[ 72.326819][ C0] ? napi_complete_done+0x1b2/0x420
[ 72.332165][ C0] ? virtqueue_napi_complete+0x28/0x80
[ 72.337609][ C0] ? virtnet_poll+0x607/0x730
[ 72.342384][ C0] ? napi_poll+0x181/0x630
[ 72.346784][ C0] ? net_rx_action+0x17a/0x480
[ 72.351541][ C0] ? __do_softirq+0x13c/0x2c3
[ 72.356299][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 72.361476][ C0] ? do_softirq_own_stack+0x32/0x40
[ 72.366669][ C0] ? __irq_exit_rcu+0xb4/0xc0
[ 72.371455][ C0] ? common_interrupt+0xb5/0x130
[ 72.376851][ C0] ? asm_common_interrupt+0x1e/0x40
[ 72.382040][ C0] ? acpi_idle_enter+0x25b/0x2e0
[ 72.386967][ C0] ? cpuidle_enter_state+0x2bd/0x750
[ 72.392339][ C0] ? cpuidle_enter+0x3c/0x60
[ 72.396902][ C0] ? do_idle+0x193/0x230
[ 72.401132][ C0] ? cpu_startup_entry+0x15/0x20
[ 72.406098][ C0] ? rest_init+0xd7/0xe0
[ 72.410324][ C0] ? arch_call_rest_init+0xa/0xb
[ 72.415289][ C0] ? start_kernel+0x59b/0x620
[ 72.419955][ C0] ? secondary_startup_64_no_verify+0xb0/0xbb
[ 72.426014][ C0] ? kvm_sched_clock_read+0x15/0x40
[ 72.431211][ C0] ? sched_clock+0xf/0x20
[ 72.435520][ C0] ? sched_clock_cpu+0x11/0x1a0
[ 72.440348][ C0] ? common_interrupt+0xb5/0x130
[ 72.445290][ C0] kcsan_setup_watchpoint+0x47b/0x4e0
[ 72.450640][ C0] ? find_next_and_bit+0x117/0x140
[ 72.455744][ C0] internal_add_timer+0x219/0x2a0
[ 72.460747][ C0] __mod_timer+0x789/0xbf0
[ 72.465155][ C0] mod_timer+0x1b/0x20
[ 72.469211][ C0] sk_reset_timer+0x1f/0xa0
[ 72.473711][ C0] tcp_send_delayed_ack+0x23e/0x250
[ 72.479096][ C0] __tcp_ack_snd_check+0x2f6/0x500
[ 72.484273][ C0] tcp_rcv_established+0x9cb/0x1450
[ 72.489455][ C0] tcp_v4_do_rcv+0x278/0x4a0
[ 72.494020][ C0] tcp_v4_rcv+0x2101/0x2370
[ 72.498516][ C0] ? nf_confirm+0x22b/0x250
[ 72.503007][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 72.508451][ C0] ip_local_deliver+0x1c0/0x280
[ 72.513292][ C0] ? ip_local_deliver+0x280/0x280
[ 72.518310][ C0] ip_sublist_rcv+0x4c4/0x590
[ 72.522977][ C0] ? ip_rcv_core+0x590/0x590
[ 72.527549][ C0] ip_list_rcv+0x262/0x290
[ 72.531950][ C0] ? ip_rcv_finish+0x160/0x160
[ 72.536691][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 72.542662][ C0] __netif_receive_skb_list+0x262/0x2e0
[ 72.548185][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 72.554247][ C0] napi_complete_done+0x1b2/0x420
[ 72.559258][ C0] ? receive_buf+0x77a/0xce0
[ 72.563827][ C0] virtqueue_napi_complete+0x28/0x80
[ 72.569195][ C0] virtnet_poll+0x607/0x730
[ 72.573683][ C0] napi_poll+0x181/0x630
[ 72.578016][ C0] net_rx_action+0x17a/0x480
[ 72.582603][ C0] __do_softirq+0x13c/0x2c3
[ 72.587438][ C0] asm_call_irq_on_stack+0xf/0x20
[ 72.592443][ C0]
[ 72.595353][ C0] do_softirq_own_stack+0x32/0x40
[ 72.600376][ C0] __irq_exit_rcu+0xb4/0xc0
[ 72.604894][ C0] common_interrupt+0xb5/0x130
[ 72.610536][ C0] asm_common_interrupt+0x1e/0x40
[ 72.615600][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0
[ 72.621172][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 1e 63 8f fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 5e 5e 8f fe 0f 00 2d e1 7f 29 03 fb f4 eb 59 49 8d 7c 24 04 e8 d8 d8 9f fe 41 8b 54 24 04 ec 48 c7 c7
[ 72.640930][ C0] RSP: 0018:ffffffff86a03da8 EFLAGS: 00000246
[ 72.646976][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000008b
[ 72.654922][ C0] RDX: ffffffff86a30780 RSI: 0000000000000000 RDI: 0000000000000000
[ 72.662867][ C0] RBP: 0000000000000001 R08: ffffffff82b5e6c2 R09: ffffffff82b5e683
[ 72.670814][ C0] R10: 0000000000000002 R11: ffffffff86a30780 R12: ffff888140c8dc64
[ 72.678933][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000
[ 72.686881][ C0] ? acpi_idle_enter+0x203/0x2e0
[ 72.691882][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 72.696796][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 72.701969][ C0] cpuidle_enter_state+0x2bd/0x750
[ 72.707072][ C0] cpuidle_enter+0x3c/0x60
[ 72.711580][ C0] do_idle+0x193/0x230
[ 72.715663][ C0] cpu_startup_entry+0x15/0x20
[ 72.720449][ C0] rest_init+0xd7/0xe0
[ 72.724510][ C0] ? time_init+0xc/0xc
[ 72.728570][ C0] arch_call_rest_init+0xa/0xb
[ 72.733324][ C0] start_kernel+0x59b/0x620
[ 72.737854][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 72.744308][ C0] Kernel Offset: disabled
[ 72.748644][ C0] Rebooting in 86400 seconds..