[ OK ] Reached target Login Prompts. [ OK ] Reached target Multi-User System. [ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... [ OK ] Started Update UTMP about System Runlevel Changes. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.20' (ECDSA) to the list of known hosts. 2021/02/06 20:51:00 fuzzer started 2021/02/06 20:51:00 dialing manager at 10.128.0.163:45863 2021/02/06 20:51:00 syscalls: 3470 2021/02/06 20:51:00 code coverage: enabled 2021/02/06 20:51:00 comparison tracing: enabled 2021/02/06 20:51:00 extra coverage: enabled 2021/02/06 20:51:00 setuid sandbox: enabled 2021/02/06 20:51:00 namespace sandbox: enabled 2021/02/06 20:51:00 Android sandbox: /sys/fs/selinux/policy does not exist 2021/02/06 20:51:00 fault injection: enabled 2021/02/06 20:51:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2021/02/06 20:51:00 net packet injection: enabled 2021/02/06 20:51:00 net device setup: enabled 2021/02/06 20:51:00 concurrency sanitizer: enabled 2021/02/06 20:51:00 devlink PCI setup: PCI device 0000:00:10.0 is not available 2021/02/06 20:51:00 USB emulation: enabled 2021/02/06 20:51:00 hci packet injection: enabled 2021/02/06 20:51:00 wifi device emulation: enabled 2021/02/06 20:51:05 suppressing KCSAN reports in functions: 'exit_signals' 'futex_wait_queue_me' '__jbd2_journal_file_buffer' '_prb_read_valid' 'filemap_map_pages' 'ext4_mb_regular_allocator' 'pcpu_alloc' 'ext4_write_end' 'blk_mq_sched_dispatch_requests' '__send_signal' '__ext4_new_inode' '__mark_inode_dirty' 'ext4_writepages' 'ext4_fc_commit' 'alloc_pid' 'kauditd_thread' 'complete_signal' 'tick_nohz_next_event' 'device_del' 'vfs_readlink' 'ext4_mb_find_by_goal' 'iptunnel_xmit' '__filemap_fdatawrite_range' 'do_sys_poll' 'wbt_issue' 'jbd2_journal_commit_transaction' 'do_nanosleep' '__delete_from_page_cache' 'sit_tunnel_xmit' 'shmem_reserve_inode' 'audit_log_start' 'jbd2_journal_stop' 'dd_has_work' 'snd_seq_oss_readq_put_timestamp' '__process_echoes' 'do_signal_stop' 'ext4_setattr' 'ext4_free_inode' 'n_tty_receive_char_inline' 'do_select' 'blk_mq_request_bypass_insert' '__xa_clear_mark' 'find_get_pages_range_tag' 'ext4_free_inodes_count' '__writeback_single_inode' 'ext4_mb_good_group' 'generic_write_end' 'start_this_handle' 'isolate_migratepages_block' 'lbmIODone' 'wbt_done' 'jbd2_journal_dirty_metadata' 'n_tty_receive_buf_common' 'shmem_add_to_page_cache' '__blkdev_put' 'ext4_mark_iloc_dirty' 'blk_mq_dispatch_rq_list' 'blk_mq_rq_ctx_init' 'exit_mm' 'expire_timers' 'xas_find_marked' 'bpf_lru_pop_free' '__ext4_handle_dirty_metadata' 2021/02/06 20:51:05 fetching corpus: 0, signal 0/2000 (executing program) 2021/02/06 20:51:05 fetching corpus: 50, signal 25762/29589 (executing program) 2021/02/06 20:51:05 fetching corpus: 100, signal 37045/42690 (executing program) 2021/02/06 20:51:05 fetching corpus: 150, signal 45800/53215 (executing program) 2021/02/06 20:51:05 fetching corpus: 200, signal 51293/60471 (executing program) 2021/02/06 20:51:06 fetching corpus: 250, signal 57666/68567 (executing program) 2021/02/06 20:51:06 fetching corpus: 300, signal 63398/76017 (executing program) 2021/02/06 20:51:06 fetching corpus: 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(executing program) 2021/02/06 20:51:39 fetching corpus: 23996, signal 418830/641445 (executing program) 2021/02/06 20:51:39 fetching corpus: 24046, signal 419127/641445 (executing program) 2021/02/06 20:51:39 fetching corpus: 24096, signal 419402/641445 (executing program) 2021/02/06 20:51:39 fetching corpus: 24146, signal 419721/641445 (executing program) 2021/02/06 20:51:39 fetching corpus: 24196, signal 420057/641445 (executing program) syzkaller login: [ 70.473209][ C0] ================================================================== [ 70.491069][ C0] BUG: KCSAN: data-race in __mod_timer / timer_clear_idle [ 70.503025][ C0] [ 70.506858][ C0] write to 0xffff88813bd1bda5 of 1 bytes by task 0 on cpu 1: [ 70.517972][ C0] timer_clear_idle+0x1e/0x30 [ 70.524940][ C0] __tick_nohz_idle_restart_tick+0x20/0x180 [ 70.535535][ C0] tick_nohz_idle_exit+0x104/0x220 [ 70.546751][ C0] do_idle+0x1f6/0x230 [ 70.553409][ C0] cpu_startup_entry+0x15/0x20 [ 70.562769][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 70.574848][ C0] [ 70.579609][ C0] read to 0xffff88813bd1bda5 of 1 bytes by interrupt on cpu 0: [ 70.595778][ C0] __mod_timer+0x8c5/0xc10 [ 70.612619][ C0] mod_timer+0x1b/0x20 [ 70.618653][ C0] sk_reset_timer+0x1f/0xa0 [ 70.625988][ C0] tcp_send_delayed_ack+0x23e/0x250 [ 70.632885][ C0] __tcp_ack_snd_check+0x2f9/0x510 [ 70.640640][ C0] tcp_rcv_established+0x9c8/0x1480 [ 70.646293][ C0] tcp_v4_do_rcv+0x278/0x4a0 [ 70.655175][ C0] tcp_v4_rcv+0x219f/0x2420 [ 70.662157][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0 [ 70.675636][ C0] ip_local_deliver+0x1d6/0x2a0 [ 70.683015][ C0] ip_sublist_rcv+0x4c4/0x590 [ 70.690530][ C0] ip_list_rcv+0x262/0x290 [ 70.698063][ C0] __netif_receive_skb_list_core+0x34b/0x450 [ 70.707627][ C0] __netif_receive_skb_list+0x262/0x2e0 [ 70.714725][ C0] netif_receive_skb_list_internal+0xda/0x330 [ 70.721780][ C0] napi_gro_receive+0x361/0x580 [ 70.727110][ C0] receive_buf+0x7a7/0xd20 [ 70.732706][ C0] virtnet_poll+0x30a/0x790 [ 70.738880][ C0] napi_poll+0x181/0x630 [ 70.745131][ C0] net_rx_action+0x17a/0x490 [ 70.751207][ C0] __do_softirq+0x13c/0x2c3 [ 70.758119][ C0] asm_call_irq_on_stack+0xf/0x20 [ 70.765277][ C0] do_softirq_own_stack+0x32/0x40 [ 70.772075][ C0] __irq_exit_rcu+0xb4/0xc0 [ 70.777562][ C0] common_interrupt+0xb5/0x130 [ 70.784121][ C0] asm_common_interrupt+0x1e/0x40 [ 70.794030][ C0] acpi_idle_enter+0x25b/0x2e0 [ 70.802919][ C0] cpuidle_enter_state+0x2b6/0x7c0 [ 70.811471][ C0] cpuidle_enter+0x3c/0x60 [ 70.816966][ C0] do_idle+0x193/0x230 [ 70.823640][ C0] cpu_startup_entry+0x15/0x20 [ 70.831294][ C0] rest_init+0xd7/0xe0 [ 70.835938][ C0] arch_call_rest_init+0xa/0xb [ 70.841865][ C0] start_kernel+0x5a1/0x626 [ 70.850084][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 70.860255][ C0] [ 70.863741][ C0] Reported by Kernel Concurrency Sanitizer on: [ 70.876797][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc6-syzkaller #0 [ 70.888244][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.901766][ C0] ================================================================== [ 70.911932][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 70.919114][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.11.0-rc6-syzkaller #0 [ 70.932520][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 70.947401][ C0] Call Trace: [ 70.951761][ C0] [ 70.956986][ C0] dump_stack+0x116/0x15d [ 70.963828][ C0] panic+0x1e7/0x5fa [ 70.970130][ C0] ? vprintk_emit+0x2e2/0x360 [ 70.976469][ C0] kcsan_report+0x67b/0x680 [ 70.983491][ C0] ? kcsan_setup_watchpoint+0x472/0x4d0 [ 70.990014][ C0] ? __mod_timer+0x8c5/0xc10 [ 70.996229][ C0] ? mod_timer+0x1b/0x20 [ 71.002716][ C0] ? sk_reset_timer+0x1f/0xa0 [ 71.009745][ C0] ? tcp_send_delayed_ack+0x23e/0x250 [ 71.051156][ C0] ? __tcp_ack_snd_check+0x2f9/0x510 [ 71.058361][ C0] ? tcp_rcv_established+0x9c8/0x1480 [ 71.066803][ C0] ? tcp_v4_do_rcv+0x278/0x4a0 [ 71.075321][ C0] ? tcp_v4_rcv+0x219f/0x2420 [ 71.081831][ C0] ? ip_protocol_deliver_rcu+0x1f9/0x3e0 [ 71.092847][ C0] ? ip_local_deliver+0x1d6/0x2a0 [ 71.100411][ C0] ? ip_sublist_rcv+0x4c4/0x590 [ 71.106190][ C0] ? ip_list_rcv+0x262/0x290 [ 71.112102][ C0] ? __netif_receive_skb_list_core+0x34b/0x450 [ 71.124208][ C0] ? __netif_receive_skb_list+0x262/0x2e0 [ 71.132119][ C0] ? netif_receive_skb_list_internal+0xda/0x330 [ 71.140327][ C0] ? napi_gro_receive+0x361/0x580 [ 71.148115][ C0] ? receive_buf+0x7a7/0xd20 [ 71.155030][ C0] ? virtnet_poll+0x30a/0x790 [ 71.160663][ C0] ? napi_poll+0x181/0x630 [ 71.169325][ C0] ? net_rx_action+0x17a/0x490 [ 71.179648][ C0] ? __do_softirq+0x13c/0x2c3 [ 71.185929][ C0] ? asm_call_irq_on_stack+0xf/0x20 [ 71.191925][ C0] ? do_softirq_own_stack+0x32/0x40 [ 71.199195][ C0] ? __irq_exit_rcu+0xb4/0xc0 [ 71.207398][ C0] ? common_interrupt+0xb5/0x130 [ 71.215924][ C0] ? asm_common_interrupt+0x1e/0x40 [ 71.225375][ C0] ? acpi_idle_enter+0x25b/0x2e0 [ 71.232678][ C0] ? cpuidle_enter_state+0x2b6/0x7c0 [ 71.240088][ C0] ? cpuidle_enter+0x3c/0x60 [ 71.247407][ C0] ? do_idle+0x193/0x230 [ 71.254005][ C0] ? cpu_startup_entry+0x15/0x20 [ 71.261330][ C0] ? rest_init+0xd7/0xe0 [ 71.267183][ C0] ? arch_call_rest_init+0xa/0xb [ 71.273217][ C0] ? start_kernel+0x5a1/0x626 [ 71.279157][ C0] ? secondary_startup_64_no_verify+0xb0/0xbb [ 71.288650][ C0] ? tick_program_event+0x78/0xc0 [ 71.295791][ C0] ? hrtimer_interrupt+0x8ee/0xa30 [ 71.303742][ C0] kcsan_setup_watchpoint+0x472/0x4d0 [ 71.311220][ C0] __mod_timer+0x8c5/0xc10 [ 71.316547][ C0] mod_timer+0x1b/0x20 [ 71.321519][ C0] sk_reset_timer+0x1f/0xa0 [ 71.326616][ C0] tcp_send_delayed_ack+0x23e/0x250 [ 71.334038][ C0] __tcp_ack_snd_check+0x2f9/0x510 [ 71.339723][ C0] tcp_rcv_established+0x9c8/0x1480 [ 71.349605][ C0] tcp_v4_do_rcv+0x278/0x4a0 [ 71.357598][ C0] tcp_v4_rcv+0x219f/0x2420 [ 71.364093][ C0] ip_protocol_deliver_rcu+0x1f9/0x3e0 [ 71.372626][ C0] ip_local_deliver+0x1d6/0x2a0 [ 71.383681][ C0] ? ip_local_deliver+0x2a0/0x2a0 [ 71.391109][ C0] ip_sublist_rcv+0x4c4/0x590 [ 71.397187][ C0] ? ip_rcv_core+0x590/0x590 [ 71.402712][ C0] ip_list_rcv+0x262/0x290 [ 71.408264][ C0] ? ip_rcv_finish+0x160/0x160 [ 71.417012][ C0] __netif_receive_skb_list_core+0x34b/0x450 [ 71.426695][ C0] __netif_receive_skb_list+0x262/0x2e0 [ 71.433795][ C0] netif_receive_skb_list_internal+0xda/0x330 [ 71.441057][ C0] napi_gro_receive+0x361/0x580 [ 71.446898][ C0] receive_buf+0x7a7/0xd20 [ 71.455821][ C0] virtnet_poll+0x30a/0x790 [ 71.463991][ C0] napi_poll+0x181/0x630 [ 71.470870][ C0] net_rx_action+0x17a/0x490 [ 71.475849][ C0] __do_softirq+0x13c/0x2c3 [ 71.485352][ C0] asm_call_irq_on_stack+0xf/0x20 [ 71.492547][ C0] [ 71.496144][ C0] do_softirq_own_stack+0x32/0x40 [ 71.502632][ C0] __irq_exit_rcu+0xb4/0xc0 [ 71.507693][ C0] common_interrupt+0xb5/0x130 [ 71.513154][ C0] asm_common_interrupt+0x1e/0x40 [ 71.519218][ C0] RIP: 0010:acpi_idle_enter+0x25b/0x2e0 [ 71.527760][ C0] Code: 48 8b 1b 48 89 de 48 83 e6 08 31 ff e8 ce 5a 8c fe 48 83 e3 08 75 63 e9 0c 00 00 00 e8 0e 56 8c fe 0f 00 2d b1 d4 25 03 fb f4 eb 59 49 8d 7c 24 04 e8 c8 f3 9c fe 41 8b 54 24 04 ec 48 c7 c7 [ 71.555267][ C0] RSP: 0018:ffffffff87403da0 EFLAGS: 00000246 [ 71.562310][ C0] RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000 [ 71.575023][ C0] RDX: ffffffff87430780 RSI: 0000000000000000 RDI: 0000000000000000 [ 71.587073][ C0] RBP: 0000000000000001 R08: ffffffff82b98c62 R09: ffffffff82b98c23 [ 71.597016][ C0] R10: 0000000000000002 R11: ffffffff87430780 R12: ffff888100f95064 [ 71.607901][ C0] R13: 0000000000000001 R14: 0000000000000001 R15: ffff88813bc00000 [ 71.620271][ C0] ? acpi_idle_enter+0x203/0x2e0 [ 71.627457][ C0] ? acpi_idle_enter+0x242/0x2e0 [ 71.635269][ C0] cpuidle_enter_state+0x2b6/0x7c0 [ 71.643946][ C0] cpuidle_enter+0x3c/0x60 [ 71.649908][ C0] do_idle+0x193/0x230 [ 71.655815][ C0] cpu_startup_entry+0x15/0x20 [ 71.662105][ C0] rest_init+0xd7/0xe0 [ 71.667867][ C0] ? time_init+0xc/0xc [ 71.673264][ C0] arch_call_rest_init+0xa/0xb [ 71.680040][ C0] start_kernel+0x5a1/0x626 [ 71.686362][ C0] secondary_startup_64_no_verify+0xb0/0xbb [ 71.694315][ C0] Kernel Offset: disabled [ 71.700119][ C0] Rebooting in 86400 seconds..