[[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 '10.128.10.22' (ECDSA) to the list of known hosts.
2020/04/28 19:15:39 fuzzer started
2020/04/28 19:15:40 dialing manager at 10.128.0.105:40209
2020/04/28 19:15:40 syscalls: 2960
2020/04/28 19:15:40 code coverage: enabled
2020/04/28 19:15:40 comparison tracing: enabled
2020/04/28 19:15:40 extra coverage: enabled
2020/04/28 19:15:40 setuid sandbox: enabled
2020/04/28 19:15:40 namespace sandbox: enabled
2020/04/28 19:15:40 Android sandbox: /sys/fs/selinux/policy does not exist
2020/04/28 19:15:40 fault injection: enabled
2020/04/28 19:15:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled
2020/04/28 19:15:40 net packet injection: enabled
2020/04/28 19:15:40 net device setup: enabled
2020/04/28 19:15:40 concurrency sanitizer: enabled
2020/04/28 19:15:40 devlink PCI setup: PCI device 0000:00:10.0 is not available
2020/04/28 19:15:40 USB emulation: /dev/raw-gadget does not exist
syzkaller login: [ 49.133724][ T6723] KCSAN: could not find function: '_find_next_bit'
2020/04/28 19:15:45 adding functions to KCSAN blacklist: '_find_next_bit' 'ext4_mark_iloc_dirty' 'copy_process' 'blk_mq_dispatch_rq_list' 'blk_mq_sched_dispatch_requests' '__x64_sys_ptrace' 'ep_poll' 'find_get_pages_range_tag' 'echo_char' 'xas_clear_mark' 'audit_log_start' '__add_to_page_cache_locked' 'pcpu_alloc' '__filemap_fdatawrite_range' 'generic_fillattr' 'ext4_da_write_end' '__ext4_new_inode' 'run_timer_softirq' 'mod_timer' 'step_into' 'tick_sched_do_timer' '__writeback_single_inode' 'tick_nohz_idle_stop_tick' '__process_echoes' 'ext4_setattr' 'alloc_pid' 'do_nanosleep' '__delete_from_page_cache' 'dd_has_work' 'ktime_get_seconds' 'io_sq_thread' 'generic_file_read_iter' 'blk_mq_get_request' 'page_counter_charge' 'do_exit' 'do_signal_stop' 'ext4_handle_inode_extension' 'ext4_writepages' 'n_tty_receive_buf_common' 'kauditd_thread' 'atime_needs_update' 'ext4_free_inodes_count' 'ktime_get_real_seconds' 'iput' '__wb_update_bandwidth' 'generic_write_end' 'futex_wait_queue_me' '__snd_rawmidi_transmit_ack' 'do_syslog' 'ptrace_check_attach' 'vfs_fsync_range'
[ 258.106190][ C0] ==================================================================
[ 258.114332][ C0] BUG: KCSAN: data-race in timer_clear_idle / trigger_dyntick_cpu.isra.0
[ 258.122729][ C0]
[ 258.125045][ C0] write to 0xffff88812c11dca4 of 1 bytes by task 0 on cpu 1:
[ 258.132392][ C0] timer_clear_idle+0x3d/0x50
[ 258.137099][ C0] __tick_nohz_idle_restart_tick+0x32/0x1a0
[ 258.142973][ C0] tick_nohz_idle_exit+0x19c/0x1d0
[ 258.148117][ C0] do_idle+0xac/0x290
[ 258.152079][ C0] cpu_startup_entry+0x14/0x20
[ 258.156824][ C0] start_secondary+0x169/0x1b0
[ 258.161594][ C0] secondary_startup_64+0xa4/0xb0
[ 258.166585][ C0]
[ 258.168928][ C0] read to 0xffff88812c11dca4 of 1 bytes by interrupt on cpu 0:
[ 258.176479][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 258.182016][ C0] mod_timer+0x50e/0x830
[ 258.186278][ C0] sk_reset_timer+0x29/0xc0
[ 258.190780][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 258.195952][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 258.201124][ C0] tcp_rcv_established+0x72b/0xee0
[ 258.206287][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 258.210884][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 258.215463][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 258.220844][ C0] ip_local_deliver_finish+0xf3/0x120
[ 258.226271][ C0] ip_local_deliver+0x135/0x220
[ 258.231109][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 258.236299][ C0] ip_sublist_rcv+0x3f8/0x530
[ 258.240951][ C0] ip_list_rcv+0x2f3/0x321
[ 258.245388][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 258.251344][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 258.257476][ C0] gro_normal_list.part.0+0x37/0xa0
[ 258.262656][ C0] gro_normal_one+0x14c/0x160
[ 258.267313][ C0] napi_gro_receive+0x27d/0x2f0
[ 258.272147][ C0] receive_buf+0x252/0x2ed0
[ 258.276628][ C0] virtnet_poll+0x343/0x790
[ 258.281107][ C0] net_rx_action+0x3ad/0xac0
[ 258.285675][ C0] __do_softirq+0x118/0x34a
[ 258.290171][ C0] irq_exit+0xb5/0xd0
[ 258.294141][ C0] do_IRQ+0x7b/0x120
[ 258.298015][ C0] ret_from_intr+0x0/0x21
[ 258.302336][ C0] native_safe_halt+0xe/0x10
[ 258.306902][ C0] default_idle+0x21/0x170
[ 258.311288][ C0] do_idle+0x1b7/0x290
[ 258.315332][ C0] cpu_startup_entry+0x14/0x20
[ 258.320084][ C0] rest_init+0xe4/0xeb
[ 258.324136][ C0] arch_call_rest_init+0x13/0x2b
[ 258.329053][ C0] start_kernel+0x82d/0x852
[ 258.333535][ C0] secondary_startup_64+0xa4/0xb0
[ 258.338531][ C0]
[ 258.340841][ C0] Reported by Kernel Concurrency Sanitizer on:
[ 258.346979][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 258.354851][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 258.364882][ C0] ==================================================================
[ 258.372916][ C0] Kernel panic - not syncing: panic_on_warn set ...
[ 258.379495][ C0] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.7.0-rc1-syzkaller #0
[ 258.387366][ C0] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[ 258.397395][ C0] Call Trace:
[ 258.400667][ C0]
[ 258.403506][ C0] dump_stack+0x11d/0x187
[ 258.407834][ C0] panic+0x210/0x640
[ 258.411707][ C0] ? vprintk_func+0x89/0x13a
[ 258.416279][ C0] kcsan_report.cold+0xc/0x1a
[ 258.420937][ C0] kcsan_setup_watchpoint+0x3fb/0x440
[ 258.426290][ C0] trigger_dyntick_cpu.isra.0+0x6d/0xf0
[ 258.431810][ C0] mod_timer+0x50e/0x830
[ 258.436037][ C0] sk_reset_timer+0x29/0xc0
[ 258.440519][ C0] tcp_send_delayed_ack+0x1fd/0x280
[ 258.445703][ C0] __tcp_ack_snd_check+0x3bb/0x550
[ 258.450789][ C0] ? constant_test_bit+0xd/0x30
[ 258.455616][ C0] tcp_rcv_established+0x72b/0xee0
[ 258.460706][ C0] tcp_v4_do_rcv+0x396/0x4f0
[ 258.465272][ C0] tcp_v4_rcv+0x1c55/0x1e10
[ 258.469758][ C0] ip_protocol_deliver_rcu+0x4b/0x410
[ 258.475123][ C0] ip_local_deliver_finish+0xf3/0x120
[ 258.480488][ C0] ip_local_deliver+0x135/0x220
[ 258.485316][ C0] ? ip_protocol_deliver_rcu+0x410/0x410
[ 258.491011][ C0] ip_sublist_rcv_finish+0xf0/0x140
[ 258.496186][ C0] ip_sublist_rcv+0x3f8/0x530
[ 258.500850][ C0] ? ip_sublist_rcv+0x530/0x530
[ 258.505678][ C0] ip_list_rcv+0x2f3/0x321
[ 258.510072][ C0] ? ip_rcv+0x1b0/0x1b0
[ 258.514212][ C0] __netif_receive_skb_list_core+0x368/0x5c0
[ 258.520177][ C0] netif_receive_skb_list_internal+0x5c7/0x810
[ 258.526326][ C0] gro_normal_list.part.0+0x37/0xa0
[ 258.531510][ C0] ? __write_once_size+0x7c/0x100
[ 258.536526][ C0] gro_normal_one+0x14c/0x160
[ 258.541211][ C0] napi_gro_receive+0x27d/0x2f0
[ 258.546052][ C0] receive_buf+0x252/0x2ed0
[ 258.550544][ C0] ? virtqueue_get_buf_ctx+0x4db/0x5c0
[ 258.555994][ C0] virtnet_poll+0x343/0x790
[ 258.560475][ C0] ? rcu_dynticks_curr_cpu_in_eqs+0x70/0xa0
[ 258.566358][ C0] net_rx_action+0x3ad/0xac0
[ 258.570929][ C0] __do_softirq+0x118/0x34a
[ 258.575411][ C0] irq_exit+0xb5/0xd0
[ 258.579368][ C0] do_IRQ+0x7b/0x120
[ 258.583242][ C0] common_interrupt+0xf/0xf
[ 258.587717][ C0]
[ 258.590646][ C0] RIP: 0010:native_safe_halt+0xe/0x10
[ 258.595994][ C0] Code: ff cc cc cc cc cc cc cc cc cc cc cc e9 07 00 00 00 0f 00 2d 1c be 57 00 f4 c3 66 90 e9 07 00 00 00 0f 00 2d 0c be 57 00 fb f4 cc 41 54 55 53 e8 97 f1 8e fc e8 b2 58 ab fd 0f 1f 44 00 00 48
[ 258.615672][ C0] RSP: 0018:ffffffff85c03e70 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffda
[ 258.624058][ C0] RAX: 0000000000000000 RBX: ffffffff85c2b840 RCX: ffffffff82561ff1
[ 258.632013][ C0] RDX: 0000000000000000 RSI: ffffffff82561ffa RDI: 0000000000000005
[ 258.639975][ C0] RBP: 0000000000000000 R08: ffffffff85c2b840 R09: 0000ffff85a6c920
[ 258.647922][ C0] R10: 0000ffff85c03e58 R11: 0000ffff85a6c927 R12: ffffffff85c2b840
[ 258.655881][ C0] R13: 0000000000000000 R14: 0000000000000000 R15: ffffffff85c2b840
[ 258.663845][ C0] ? debug_smp_processor_id+0x31/0x129
[ 258.669283][ C0] ? debug_smp_processor_id+0x3a/0x129
[ 258.674717][ C0] default_idle+0x21/0x170
[ 258.679108][ C0] do_idle+0x1b7/0x290
[ 258.683152][ C0] ? do_idle+0xe0/0x290
[ 258.687299][ C0] cpu_startup_entry+0x14/0x20
[ 258.692040][ C0] rest_init+0xe4/0xeb
[ 258.696092][ C0] arch_call_rest_init+0x13/0x2b
[ 258.701007][ C0] start_kernel+0x82d/0x852
[ 258.705505][ C0] secondary_startup_64+0xa4/0xb0
[ 258.711671][ C0] Kernel Offset: disabled
[ 258.715986][ C0] Rebooting in 86400 seconds..