Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.254' (ECDSA) to the list of known hosts. 2020/05/08 15:28:32 fuzzer started 2020/05/08 15:28:33 dialing manager at 10.128.0.105:46419 2020/05/08 15:28:33 syscalls: 3055 2020/05/08 15:28:33 code coverage: enabled 2020/05/08 15:28:33 comparison tracing: enabled 2020/05/08 15:28:33 extra coverage: enabled 2020/05/08 15:28:33 setuid sandbox: enabled 2020/05/08 15:28:33 namespace sandbox: enabled 2020/05/08 15:28:33 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/08 15:28:33 fault injection: enabled 2020/05/08 15:28:33 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/08 15:28:33 net packet injection: enabled 2020/05/08 15:28:33 net device setup: enabled 2020/05/08 15:28:33 concurrency sanitizer: enabled 2020/05/08 15:28:33 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/08 15:28:33 USB emulation: enabled syzkaller login: [ 54.379899][ T8939] KCSAN: could not find function: '_find_next_bit' 2020/05/08 15:28:37 adding functions to KCSAN blacklist: '__ext4_new_inode' 'tick_nohz_idle_stop_tick' 'tick_nohz_next_event' 'ext4_writepages' 'yama_ptracer_del' 'generic_write_end' 'blk_mq_dispatch_rq_list' 'do_nanosleep' 'shmem_file_read_iter' 'ext4_mark_iloc_dirty' 'n_tty_receive_buf_common' 'page_counter_charge' 'add_timer' 'xas_clear_mark' 'mod_timer' '__add_to_page_cache_locked' 'copy_process' 'tick_sched_do_timer' 'echo_char' 'blk_mq_get_request' 'find_get_pages_range_tag' 'run_timer_softirq' '_find_next_bit' 'futex_wait_queue_me' 'ktime_get_seconds' 'ep_poll' 'pcpu_alloc' 'do_exit' 'do_syslog' '__dev_queue_xmit' 'queue_access_lock' 'blk_mq_sched_dispatch_requests' 'ext4_free_inodes_count' 'generic_fillattr' 'ktime_get_real_seconds' [ 59.926073][ C0] ================================================================== [ 59.934268][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0 [ 59.942791][ C0] [ 59.945103][ C0] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1: [ 59.952452][ C0] timer_clear_idle+0x3d/0x50 [ 59.957113][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0 [ 59.963001][ C0] tick_nohz_idle_exit+0x19c/0x1d0 [ 59.968093][ C0] do_idle+0xac/0x290 [ 59.972068][ C0] cpu_startup_entry+0x14/0x20 [ 59.976811][ C0] start_secondary+0x169/0x1b0 [ 59.981557][ C0] secondary_startup_64+0xa4/0xb0 [ 59.986566][ C0] [ 59.988891][ C0] read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0: [ 59.996425][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 60.001971][ C0] mod_timer+0x50e/0x830 [ 60.006291][ C0] sk_reset_timer+0x29/0xc0 [ 60.010773][ C0] tcp_send_delayed_ack+0x1fd/0x280 [ 60.015952][ C0] __tcp_ack_snd_check+0x3bb/0x550 [ 60.021056][ C0] tcp_rcv_established+0x72b/0xee0 [ 60.026158][ C0] tcp_v4_do_rcv+0x396/0x4f0 [ 60.030728][ C0] tcp_v4_rcv+0x1c55/0x1e10 [ 60.035473][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 60.040831][ C0] ip_local_deliver_finish+0xf3/0x120 [ 60.046181][ C0] ip_local_deliver+0x135/0x220 [ 60.051025][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 60.056216][ C0] ip_sublist_rcv+0x3f8/0x530 [ 60.060870][ C0] ip_list_rcv+0x2f3/0x321 [ 60.065264][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 60.071218][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 60.077360][ C0] gro_normal_list.part.0+0x37/0xa0 [ 60.082551][ C0] gro_normal_one+0x14c/0x160 [ 60.087208][ C0] napi_gro_receive+0x27d/0x2f0 [ 60.092040][ C0] receive_buf+0x24c/0x3420 [ 60.096541][ C0] virtnet_poll+0x343/0x790 [ 60.101038][ C0] net_rx_action+0x3ad/0xac0 [ 60.105607][ C0] __do_softirq+0x118/0x34a [ 60.110351][ C0] irq_exit+0xb5/0xd0 [ 60.114306][ C0] do_IRQ+0x7b/0x120 [ 60.118194][ C0] ret_from_intr+0x0/0x21 [ 60.122502][ C0] native_safe_halt+0xe/0x10 [ 60.127067][ C0] default_idle+0x21/0x170 [ 60.131464][ C0] do_idle+0x1b7/0x290 [ 60.135520][ C0] cpu_startup_entry+0x14/0x20 [ 60.140262][ C0] rest_init+0xe4/0xeb [ 60.144306][ C0] arch_call_rest_init+0x13/0x2b [ 60.149216][ C0] start_kernel+0x7fe/0x823 [ 60.153694][ C0] secondary_startup_64+0xa4/0xb0 [ 60.158684][ C0] [ 60.160984][ C0] Reported by Kernel Concurrency Sanitizer on: [ 60.167116][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 60.174990][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.185030][ C0] ================================================================== [ 60.193180][ C0] Kernel panic - not syncing: panic_on_warn set ... [ 60.199777][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0 [ 60.207666][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 60.217704][ C0] Call Trace: [ 60.220985][ C0] [ 60.223959][ C0] dump_stack+0x11d/0x187 [ 60.228288][ C0] panic+0x210/0x640 [ 60.232173][ C0] ? vprintk_func+0x89/0x13a [ 60.236758][ C0] kcsan_report.cold+0xc/0x1a [ 60.241431][ C0] kcsan_setup_watchpoint+0x3fb/0x440 [ 60.246811][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0 [ 60.252341][ C0] mod_timer+0x50e/0x830 [ 60.256574][ C0] sk_reset_timer+0x29/0xc0 [ 60.261062][ C0] tcp_send_delayed_ack+0x1fd/0x280 [ 60.266243][ C0] __tcp_ack_snd_check+0x3bb/0x550 [ 60.271336][ C0] ? constant_test_bit+0xd/0x30 [ 60.276174][ C0] tcp_rcv_established+0x72b/0xee0 [ 60.281284][ C0] tcp_v4_do_rcv+0x396/0x4f0 [ 60.285865][ C0] tcp_v4_rcv+0x1c55/0x1e10 [ 60.290377][ C0] ip_protocol_deliver_rcu+0x4b/0x410 [ 60.295763][ C0] ip_local_deliver_finish+0xf3/0x120 [ 60.301132][ C0] ip_local_deliver+0x135/0x220 [ 60.305988][ C0] ? ip_protocol_deliver_rcu+0x410/0x410 [ 60.311622][ C0] ip_sublist_rcv_finish+0xf0/0x140 [ 60.316801][ C0] ip_sublist_rcv+0x3f8/0x530 [ 60.321483][ C0] ? ip_sublist_rcv+0x530/0x530 [ 60.326317][ C0] ip_list_rcv+0x2f3/0x321 [ 60.330713][ C0] ? ip_rcv+0x1b0/0x1b0 [ 60.334937][ C0] __netif_receive_skb_list_core+0x368/0x5c0 [ 60.340992][ C0] ? ktime_get_with_offset+0x1e6/0x230 [ 60.346439][ C0] netif_receive_skb_list_internal+0x5c7/0x810 [ 60.352585][ C0] gro_normal_list.part.0+0x37/0xa0 [ 60.357771][ C0] ? __write_once_size+0x7c/0x100 [ 60.362774][ C0] gro_normal_one+0x14c/0x160 [ 60.367437][ C0] napi_gro_receive+0x27d/0x2f0 [ 60.372271][ C0] receive_buf+0x24c/0x3420 [ 60.376770][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 60.382226][ C0] virtnet_poll+0x343/0x790 [ 60.386715][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x70/0xa0 [ 60.392611][ C0] net_rx_action+0x3ad/0xac0 [ 60.397209][ C0] __do_softirq+0x118/0x34a [ 60.402525][ C0] irq_exit+0xb5/0xd0 [ 60.406489][ C0] do_IRQ+0x7b/0x120 [ 60.410364][ C0] common_interrupt+0xf/0xf [ 60.414845][ C0] [ 60.417766][ C0] RIP: 0010:native_safe_halt+0xe/0x10 [ 60.423123][ 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 [ 60.442862][ C0] RSP: 0018:ffffffff87203e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda [ 60.451269][ C0] RAX: 0000000000000000 RBX: ffffffff8722b840 RCX: ffffffff8285fdf1 [ 60.459219][ C0] RDX: 0000000000000000 RSI: ffffffff8285fdfa RDI: 0000000000000005 [ 60.467172][ C0] RBP: 0000000000000000 R08: ffffffff8722b840 R09: 0000ffff87047920 [ 60.475126][ C0] R10: 0000ffff87203e58 R11: 0000ffff87047927 R12: ffffffff8722b840 [ 60.483072][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff8722b840 [ 60.491031][ C0] ? debug_smp_processor_id+0x31/0x129 [ 60.496488][ C0] ? debug_smp_processor_id+0x3a/0x129 [ 60.501936][ C0] default_idle+0x21/0x170 [ 60.506336][ C0] do_idle+0x1b7/0x290 [ 60.510385][ C0] ? debug_smp_processor_id+0x3f/0x129 [ 60.515847][ C0] cpu_startup_entry+0x14/0x20 [ 60.520677][ C0] rest_init+0xe4/0xeb [ 60.524725][ C0] ? trace_init_perf_perm_irq_work_exit+0xe/0xe [ 60.530940][ C0] arch_call_rest_init+0x13/0x2b [ 60.535859][ C0] start_kernel+0x7fe/0x823 [ 60.540361][ C0] secondary_startup_64+0xa4/0xb0 [ 60.546693][ C0] Kernel Offset: disabled [ 60.551022][ C0] Rebooting in 86400 seconds..