[[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 '10.128.10.17' (ECDSA) to the list of known hosts.
2020/11/20 22:37:25 fuzzer started
2020/11/20 22:37:25 dialing manager at 10.128.0.105:35883
2020/11/20 22:37:25 syscalls: 3448
2020/11/20 22:37:25 code coverage: enabled
2020/11/20 22:37:25 comparison tracing: enabled
2020/11/20 22:37:25 extra coverage: enabled
2020/11/20 22:37:25 setuid sandbox: enabled
2020/11/20 22:37:25 namespace sandbox: enabled
2020/11/20 22:37:25 Android sandbox: /sys/fs/selinux/policy does not exist
2020/11/20 22:37:25 fault injection: enabled
2020/11/20 22:37:25 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/11/20 22:37:25 net packet injection: enabled
2020/11/20 22:37:25 net device setup: enabled
2020/11/20 22:37:25 concurrency sanitizer: enabled
2020/11/20 22:37:25 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/11/20 22:37:25 USB emulation: enabled
2020/11/20 22:37:25 hci packet injection: enabled
2020/11/20 22:37:25 wifi device emulation: enabled
2020/11/20 22:37:30 suppressing KCSAN reports in functions: 'generic_write_end' '__add_to_page_cache_locked' 'audit_log_start' '__ext4_new_inode' '__mod_timer' '__io_cqring_fill_event' 'filemap_map_pages' 'find_get_pages_range_tag' 'ext4_mb_good_group' '__delete_from_page_cache' 'step_into' 'do_select' 'exit_signals' '_prb_read_valid' 'ext4_free_inode' '__mark_inode_dirty' 'ext4_setattr' 'pcpu_alloc' 'ext4_handle_inode_extension' 'blk_mq_dispatch_rq_list' 'do_nanosleep' 'ext4_ext_try_to_merge_right' 'xas_clear_mark' 'n_tty_receive_char_inline' 'ip_tunnel_xmit' 'ext4_writepages' '__xa_clear_mark' 'ext4_mb_find_by_goal' 'xas_find_marked' 'copy_page_to_iter' 'ext4_mb_regular_allocator' 'tick_nohz_next_event' 'do_signal_stop' 'blk_mq_sched_dispatch_requests' 'do_epoll_ctl' '__filemap_fdatawrite_range' 'ext4_ext_insert_extent' 'futex_wait_queue_me' 'tick_sched_timer' 'do_sys_poll' 'complete_signal' 'ext4_mark_iloc_dirty' 'check_mmio_spte' 'do_readlinkat' 'blk_mq_rq_ctx_init' 'alloc_pid' 'wbt_done' 'n_tty_receive_buf_common' '__ext4_update_other_inode_time' 'blk_mq_request_bypass_insert' 'dd_has_work' 'expire_timers' 'snd_rawmidi_poll' 'ext4_write_end' 'wg_packet_decrypt_worker' 'yama_task_free' 'kauditd_thread' 'ext4_free_inodes_count' '__delayacct_blkio_end' '__writeback_single_inode' 'cgroup_freezer_migrate_task'
syzkaller login: [ 143.516935][ C0] ==================================================================
[ 143.525024][ C0] BUG: KCSAN: data-race in internal_add_timer / timer_clear_idle
[ 143.532707][ C0]
[ 143.535013][ C0] write to 0xffff88813bd1bce5 of 1 bytes by task 0 on cpu 1:
[ 143.542396][ C0] timer_clear_idle+0x1e/0x30
[ 143.547041][ C0] __tick_nohz_idle_restart_tick+0x20/0x180
[ 143.552905][ C0] tick_nohz_idle_exit+0xfc/0x210
[ 143.557899][ C0] do_idle+0x1f6/0x230
[ 143.561956][ C0] cpu_startup_entry+0x15/0x20
[ 143.566710][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 143.572566][ C0]
[ 143.574869][ C0] read to 0xffff88813bd1bce5 of 1 bytes by interrupt on cpu 0:
[ 143.582382][ C0] internal_add_timer+0x219/0x2a0
[ 143.587375][ C0] __mod_timer+0x789/0xbf0
[ 143.591761][ C0] mod_timer+0x1b/0x20
[ 143.595802][ C0] sk_reset_timer+0x1f/0xa0
[ 143.600277][ C0] tcp_send_delayed_ack+0x23e/0x250
[ 143.605452][ C0] __tcp_ack_snd_check+0x2f6/0x500
[ 143.610532][ C0] tcp_rcv_established+0x11bc/0x1450
[ 143.615787][ C0] tcp_v4_do_rcv+0x278/0x4a0
[ 143.620345][ C0] tcp_v4_rcv+0x2101/0x2370
[ 143.624906][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 143.630339][ C0] ip_local_deliver+0x1c0/0x280
[ 143.635159][ C0] ip_sublist_rcv+0x4c4/0x590
[ 143.639808][ C0] ip_list_rcv+0x262/0x290
[ 143.644206][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 143.650157][ C0] __netif_receive_skb_list+0x262/0x2e0
[ 143.655691][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 143.661817][ C0] napi_complete_done+0x1b2/0x420
[ 143.666814][ C0] virtqueue_napi_complete+0x28/0x80
[ 143.672084][ C0] virtnet_poll+0x607/0x730
[ 143.676559][ C0] napi_poll+0x178/0x4c0
[ 143.680772][ C0] net_rx_action+0x17a/0x480
[ 143.685351][ C0] __do_softirq+0x12c/0x2b1
[ 143.689826][ C0] asm_call_irq_on_stack+0xf/0x20
[ 143.694822][ C0] do_softirq_own_stack+0x32/0x40
[ 143.699833][ C0] __irq_exit_rcu+0xb2/0xc0
[ 143.704312][ C0] common_interrupt+0xb5/0x130
[ 143.709047][ C0] asm_common_interrupt+0x1e/0x40
[ 143.714059][ C0] acpi_idle_enter+0x25b/0x2e0
[ 143.718797][ C0] cpuidle_enter_state+0x2bd/0x750
[ 143.724228][ C0] cpuidle_enter+0x3c/0x60
[ 143.728616][ C0] do_idle+0x193/0x230
[ 143.732655][ C0] cpu_startup_entry+0x15/0x20
[ 143.737387][ C0] rest_init+0xd7/0xe0
[ 143.741437][ C0] arch_call_rest_init+0xa/0xb
[ 143.746176][ C0] start_kernel+0x5a0/0x625
[ 143.750661][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 143.756518][ C0]
[ 143.758819][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 143.764948][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc4-syzkaller #0
[ 143.772895][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 143.782922][ C0] ==================================================================
[ 143.791041][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 143.798555][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.10.0-rc4-syzkaller #0
[ 143.806512][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 143.816535][ C0] Call Trace:
[ 143.819789][ C0]
[ 143.822630][ C0] dump_stack+0x116/0x15d
[ 143.826931][ C0] panic+0x1e7/0x5fa
[ 143.830797][ C0] ? vprintk_emit+0x2f2/0x370
[ 143.835446][ C0] kcsan_report+0x67b/0x680
[ 143.839925][ C0] ? __dev_queue_xmit+0xc03/0x1510
[ 143.845008][ C0] ? kcsan_setup_watchpoint+0x46a/0x4d0
[ 143.850527][ C0] ? internal_add_timer+0x219/0x2a0
[ 143.855696][ C0] ? __mod_timer+0x789/0xbf0
[ 143.860365][ C0] ? mod_timer+0x1b/0x20
[ 143.864598][ C0] ? sk_reset_timer+0x1f/0xa0
[ 143.869264][ C0] ? tcp_send_delayed_ack+0x23e/0x250
[ 143.874607][ C0] ? __tcp_ack_snd_check+0x2f6/0x500
[ 143.879878][ C0] ? tcp_rcv_established+0x11bc/0x1450
[ 143.885397][ C0] ? tcp_v4_do_rcv+0x278/0x4a0
[ 143.890152][ C0] ? tcp_v4_rcv+0x2101/0x2370
[ 143.894826][ C0] ? ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 143.900443][ C0] ? ip_local_deliver+0x1c0/0x280
[ 143.906826][ C0] ? ip_sublist_rcv+0x4c4/0x590
[ 143.911644][ C0] ? ip_list_rcv+0x262/0x290
[ 143.916206][ C0] ? __netif_receive_skb_list_core+0x34b/0x450
[ 143.922329][ C0] ? __netif_receive_skb_list+0x262/0x2e0
[ 143.928021][ C0] ? netif_receive_skb_list_internal+0xda/0x330
[ 143.934250][ C0] ? napi_complete_done+0x1b2/0x420
[ 143.939421][ C0] ? virtqueue_napi_complete+0x28/0x80
[ 143.944849][ C0] ? virtnet_poll+0x607/0x730
[ 143.949500][ C0] ? napi_poll+0x178/0x4c0
[ 143.953891][ C0] ? net_rx_action+0x17a/0x480
[ 143.958635][ C0] ? __do_softirq+0x12c/0x2b1
[ 143.963367][ C0] ? asm_call_irq_on_stack+0xf/0x20
[ 143.968630][ C0] ? do_softirq_own_stack+0x32/0x40
[ 143.973804][ C0] ? __irq_exit_rcu+0xb2/0xc0
[ 143.978454][ C0] ? common_interrupt+0xb5/0x130
[ 143.983360][ C0] ? asm_common_interrupt+0x1e/0x40
[ 143.988528][ C0] ? acpi_idle_enter+0x25b/0x2e0
[ 143.993436][ C0] ? cpuidle_enter_state+0x2bd/0x750
[ 143.998690][ C0] ? cpuidle_enter+0x3c/0x60
[ 144.003249][ C0] ? do_idle+0x193/0x230
[ 144.007477][ C0] ? cpu_startup_entry+0x15/0x20
[ 144.012381][ C0] ? rest_init+0xd7/0xe0
[ 144.016597][ C0] ? arch_call_rest_init+0xa/0xb
[ 144.021504][ C0] ? start_kernel+0x5a0/0x625
[ 144.026156][ C0] ? secondary_startup_64_no_verify+0xb0/0xbb
[ 144.032216][ C0] ? xfs_dir2_node_addname+0x2f3/0xdc0
[ 144.037644][ C0] ? note_interrupt+0x462/0x5f0
[ 144.042464][ C0] kcsan_setup_watchpoint+0x46a/0x4d0
[ 144.047823][ C0] ? find_next_and_bit+0x117/0x140
[ 144.052905][ C0] internal_add_timer+0x219/0x2a0
[ 144.057898][ C0] __mod_timer+0x789/0xbf0
[ 144.062284][ C0] mod_timer+0x1b/0x20
[ 144.066324][ C0] sk_reset_timer+0x1f/0xa0
[ 144.070798][ C0] tcp_send_delayed_ack+0x23e/0x250
[ 144.075967][ C0] __tcp_ack_snd_check+0x2f6/0x500
[ 144.081048][ C0] tcp_rcv_established+0x11bc/0x1450
[ 144.086309][ C0] tcp_v4_do_rcv+0x278/0x4a0
[ 144.090871][ C0] tcp_v4_rcv+0x2101/0x2370
[ 144.095350][ C0] ? nf_confirm+0x22b/0x250
[ 144.099829][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0
[ 144.105260][ C0] ip_local_deliver+0x1c0/0x280
[ 144.110083][ C0] ? ip_local_deliver+0x280/0x280
[ 144.115078][ C0] ip_sublist_rcv+0x4c4/0x590
[ 144.119728][ C0] ? ip_rcv_core+0x590/0x590
[ 144.124290][ C0] ip_list_rcv+0x262/0x290
[ 144.128678][ C0] ? ip_rcv_finish+0x160/0x160
[ 144.133412][ C0] __netif_receive_skb_list_core+0x34b/0x450
[ 144.139363][ C0] __netif_receive_skb_list+0x262/0x2e0
[ 144.144882][ C0] netif_receive_skb_list_internal+0xda/0x330
[ 144.150936][ C0] napi_complete_done+0x1b2/0x420
[ 144.155950][ C0] ? receive_buf+0x77a/0xce0
[ 144.160536][ C0] virtqueue_napi_complete+0x28/0x80
[ 144.165792][ C0] virtnet_poll+0x607/0x730
[ 144.170267][ C0] napi_poll+0x178/0x4c0
[ 144.174483][ C0] net_rx_action+0x17a/0x480
[ 144.179044][ C0] __do_softirq+0x12c/0x2b1
[ 144.183516][ C0] asm_call_irq_on_stack+0xf/0x20
[ 144.188505][ C0]
[ 144.191416][ C0] do_softirq_own_stack+0x32/0x40
[ 144.196411][ C0] __irq_exit_rcu+0xb2/0xc0
[ 144.200887][ C0] common_interrupt+0xb5/0x130
[ 144.205623][ C0] asm_common_interrupt+0x1e/0x40
[ 144.210630][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0
[ 144.216148][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 7e d7 8f fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 be d2 8f fe 0f 00 2d 71 83 2a 03 fb f4 eb 59 49 8d 7c 24 04 e8 18 fd 9f fe 41 8b 54 24 04 ec 48 c7 c7
[ 144.235740][ C0] RSP: 0018:ffffffff86a03da8 EFLAGS: 00000246
[ 144.241779][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 000000000000008b
[ 144.249744][ C0] RDX: ffffffff86a30780 RSI: 0000000000000000 RDI: 0000000000000000
[ 144.257702][ C0] RBP: 0000000000000001 R08: ffffffff82b4b782 R09: ffffffff82b4b743
[ 144.265645][ C0] R10: 0000000000000002 R11: ffffffff86a30780 R12: ffff888101315464
[ 144.273593][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000
[ 144.281539][ C0] ? acpi_idle_enter+0x203/0x2e0
[ 144.286445][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 144.291354][ C0] ? acpi_idle_enter+0x242/0x2e0
[ 144.296265][ C0] cpuidle_enter_state+0x2bd/0x750
[ 144.301348][ C0] cpuidle_enter+0x3c/0x60
[ 144.305735][ C0] do_idle+0x193/0x230
[ 144.309774][ C0] cpu_startup_entry+0x15/0x20
[ 144.314509][ C0] rest_init+0xd7/0xe0
[ 144.318550][ C0] ? time_init+0xc/0xc
[ 144.322589][ C0] arch_call_rest_init+0xa/0xb
[ 144.327325][ C0] start_kernel+0x5a0/0x625
[ 144.331799][ C0] secondary_startup_64_no_verify+0xb0/0xbb
[ 144.338292][ C0] Kernel Offset: disabled
[ 144.342672][ C0] Rebooting in 86400 seconds..