[ 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. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.250' (ECDSA) to the list of known hosts. 2020/05/28 18:18:22 fuzzer started 2020/05/28 18:18:23 dialing manager at 10.128.0.105:45675 2020/05/28 18:18:23 syscalls: 3055 2020/05/28 18:18:23 code coverage: enabled 2020/05/28 18:18:23 comparison tracing: enabled 2020/05/28 18:18:23 extra coverage: enabled 2020/05/28 18:18:23 setuid sandbox: enabled 2020/05/28 18:18:23 namespace sandbox: enabled 2020/05/28 18:18:23 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/28 18:18:23 fault injection: enabled 2020/05/28 18:18:23 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/28 18:18:23 net packet injection: enabled 2020/05/28 18:18:23 net device setup: enabled 2020/05/28 18:18:23 concurrency sanitizer: enabled 2020/05/28 18:18:23 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/28 18:18:23 USB emulation: enabled syzkaller login: [ 55.292739][ T8919] KCSAN: could not find function: '_find_next_bit' [ 57.382236][ T8919] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/28 18:18:28 adding functions to KCSAN blacklist: 'echo_char' 'blk_mq_dispatch_rq_list' 'blk_mq_get_request' '__snd_rawmidi_transmit_ack' 'file_update_time' 'ext4_mb_find_by_goal' 'ktime_get_real_seconds' 'add_timer' 'ep_poll' 'find_get_pages_range_tag' 'wbt_done' 'do_exit' 'futex_wait_queue_me' 'ext4_free_inodes_count' 'decrypt_packet' 'page_counter_charge' 'xas_clear_mark' 'tick_sched_do_timer' 'alloc_pid' 'dd_has_work' '__ext4_new_inode' 'mod_timer' '_find_next_bit' 'ext4_mark_iloc_dirty' 'do_signal_stop' 'ext4_ext_try_to_merge_right' 'shmem_getpage_gfp' '__send_signal' 'blk_mq_sched_dispatch_requests' 'complete_signal' 'do_nanosleep' 'tick_nohz_idle_stop_tick' 'kauditd_thread' 'generic_fillattr' '__mark_inode_dirty' 'shmem_file_read_iter' 'run_timer_softirq' 'generic_write_end' 'copy_process' 'poll_schedule_timeout' 'pcpu_alloc' [ 163.213605][ C1] ================================================================== [ 163.221873][ C1] BUG: KCSAN: data-race in ktime_get / timekeeping_advance [ 163.229036][ C1] [ 163.231345][ C1] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 0: [ 163.239311][ C1] timekeeping_advance+0x88e/0xd80 [ 163.244403][ C1] update_wall_time+0x15/0x20 [ 163.249063][ C1] tick_do_update_jiffies64+0x1e5/0x2a0 [ 163.254593][ C1] tick_sched_do_timer+0xc7/0xd0 [ 163.259785][ C1] tick_sched_timer+0x3f/0xd0 [ 163.264456][ C1] __hrtimer_run_queues+0x271/0x600 [ 163.269659][ C1] hrtimer_interrupt+0x226/0x490 [ 163.274609][ C1] smp_apic_timer_interrupt+0xd8/0x270 [ 163.280314][ C1] apic_timer_interrupt+0xf/0x20 [ 163.285244][ C1] native_safe_halt+0xe/0x10 [ 163.289817][ C1] default_idle+0x21/0x170 [ 163.294214][ C1] do_idle+0x1b7/0x290 [ 163.298269][ C1] cpu_startup_entry+0x14/0x20 [ 163.303006][ C1] rest_init+0xe4/0xeb [ 163.307065][ C1] arch_call_rest_init+0x13/0x2b [ 163.311989][ C1] start_kernel+0x7fe/0x823 [ 163.316485][ C1] secondary_startup_64+0xa4/0xb0 [ 163.321488][ C1] [ 163.323801][ C1] read to 0xffffffff88ae90d8 of 8 bytes by interrupt on cpu 1: [ 163.331445][ C1] ktime_get+0xcf/0x210 [ 163.336296][ C1] tcp_mstamp_refresh+0x19/0x70 [ 163.341139][ C1] tcp_rcv_established+0x81/0xee0 [ 163.346283][ C1] tcp_v4_do_rcv+0x396/0x4f0 [ 163.350890][ C1] tcp_v4_rcv+0x1c55/0x1e10 [ 163.355381][ C1] ip_protocol_deliver_rcu+0x4b/0x410 [ 163.360754][ C1] ip_local_deliver_finish+0xf3/0x120 [ 163.366993][ C1] ip_local_deliver+0x135/0x220 [ 163.371921][ C1] ip_sublist_rcv_finish+0xf0/0x140 [ 163.377108][ C1] ip_sublist_rcv+0x3f8/0x530 [ 163.381759][ C1] ip_list_rcv+0x2f3/0x321 [ 163.386172][ C1] __netif_receive_skb_list_core+0x368/0x5c0 [ 163.392162][ C1] netif_receive_skb_list_internal+0x5c7/0x810 [ 163.398483][ C1] gro_normal_list.part.0+0x37/0xa0 [ 163.403663][ C1] gro_normal_one+0x14c/0x160 [ 163.408320][ C1] napi_gro_receive+0x27d/0x2f0 [ 163.413172][ C1] receive_buf+0x24c/0x3420 [ 163.417666][ C1] virtnet_poll+0x343/0x790 [ 163.422162][ C1] net_rx_action+0x3ad/0xac0 [ 163.426818][ C1] __do_softirq+0x118/0x34a [ 163.431312][ C1] run_ksoftirqd+0x41/0x60 [ 163.435728][ C1] smpboot_thread_fn+0x374/0x4a0 [ 163.440657][ C1] kthread+0x203/0x230 [ 163.444967][ C1] ret_from_fork+0x1f/0x30 [ 163.449371][ C1] [ 163.451690][ C1] Reported by Kernel Concurrency Sanitizer on: [ 163.458616][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 163.466738][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 163.476792][ C1] ================================================================== [ 163.484975][ C1] Kernel panic - not syncing: panic_on_warn set ... [ 163.491775][ C1] CPU: 1 PID: 16 Comm: ksoftirqd/1 Not tainted 5.7.0-rc1-syzkaller #0 [ 163.500087][ C1] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 163.510148][ C1] Call Trace: [ 163.514142][ C1] dump_stack+0x11d/0x187 [ 163.518472][ C1] panic+0x210/0x640 [ 163.522355][ C1] ? vprintk_func+0x89/0x13a [ 163.526952][ C1] kcsan_report.cold+0xc/0x1a [ 163.531620][ C1] kcsan_setup_watchpoint+0x3fb/0x440 [ 163.536978][ C1] ktime_get+0xcf/0x210 [ 163.542089][ C1] tcp_mstamp_refresh+0x19/0x70 [ 163.547013][ C1] tcp_rcv_established+0x81/0xee0 [ 163.552033][ C1] ? __read_once_size+0x45/0xd0 [ 163.556892][ C1] tcp_v4_do_rcv+0x396/0x4f0 [ 163.561465][ C1] tcp_v4_rcv+0x1c55/0x1e10 [ 163.565966][ C1] ip_protocol_deliver_rcu+0x4b/0x410 [ 163.571344][ C1] ip_local_deliver_finish+0xf3/0x120 [ 163.576709][ C1] ip_local_deliver+0x135/0x220 [ 163.581561][ C1] ? ip_protocol_deliver_rcu+0x410/0x410 [ 163.587273][ C1] ip_sublist_rcv_finish+0xf0/0x140 [ 163.592465][ C1] ip_sublist_rcv+0x3f8/0x530 [ 163.597124][ C1] ? ip_sublist_rcv+0x530/0x530 [ 163.601987][ C1] ip_list_rcv+0x2f3/0x321 [ 163.606496][ C1] ? ip_rcv+0x1b0/0x1b0 [ 163.610640][ C1] __netif_receive_skb_list_core+0x368/0x5c0 [ 163.616618][ C1] ? ktime_get_with_offset+0x1e6/0x230 [ 163.622057][ C1] netif_receive_skb_list_internal+0x5c7/0x810 [ 163.628193][ C1] gro_normal_list.part.0+0x37/0xa0 [ 163.633369][ C1] ? __write_once_size+0x7c/0x100 [ 163.638375][ C1] gro_normal_one+0x14c/0x160 [ 163.643191][ C1] napi_gro_receive+0x27d/0x2f0 [ 163.648130][ C1] receive_buf+0x24c/0x3420 [ 163.652729][ C1] ? virtqueue_get_buf_ctx+0x4db/0x5c0 [ 163.658278][ C1] virtnet_poll+0x343/0x790 [ 163.662780][ C1] net_rx_action+0x3ad/0xac0 [ 163.667454][ C1] __do_softirq+0x118/0x34a [ 163.671936][ C1] ? takeover_tasklets+0x240/0x240 [ 163.677023][ C1] run_ksoftirqd+0x41/0x60 [ 163.681430][ C1] smpboot_thread_fn+0x374/0x4a0 [ 163.686369][ C1] ? constant_test_bit.constprop.0+0x30/0x30 [ 163.692698][ C1] kthread+0x203/0x230 [ 163.696787][ C1] ? kthread_unpark+0xd0/0xd0 [ 163.701458][ C1] ret_from_fork+0x1f/0x30 [ 163.707111][ C1] Kernel Offset: disabled [ 163.711443][ C1] Rebooting in 86400 seconds..