[ 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 '10.128.0.19' (ECDSA) to the list of known hosts. 2020/04/19 02:52:57 fuzzer started 2020/04/19 02:53:00 dialing manager at 10.128.0.105:45083 2020/04/19 02:53:00 syscalls: 2960 2020/04/19 02:53:00 code coverage: enabled 2020/04/19 02:53:00 comparison tracing: enabled 2020/04/19 02:53:00 extra coverage: enabled 2020/04/19 02:53:00 setuid sandbox: enabled 2020/04/19 02:53:00 namespace sandbox: enabled 2020/04/19 02:53:00 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/19 02:53:00 fault injection: enabled 2020/04/19 02:53:00 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/19 02:53:00 net packet injection: enabled 2020/04/19 02:53:00 net device setup: enabled 2020/04/19 02:53:00 concurrency sanitizer: enabled 2020/04/19 02:53:00 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/19 02:53:00 USB emulation: /dev/raw-gadget does not exist syzkaller login: [ 50.308099][ T6709] KCSAN: could not find function: '_find_next_bit' [ 52.259780][ T6709] KCSAN: could not find function: 'poll_schedule_timeout' 2020/04/19 02:53:05 adding functions to KCSAN blacklist: 'blk_mq_get_request' 'xas_clear_mark' 'copy_process' '_find_next_bit' 'run_timer_softirq' '__d_lookup_done' 'do_signal_stop' 'add_timer' 'path_openat' 'mod_timer' 'filemap_map_pages' '__ext4_new_inode' '__mark_inode_dirty' 'blk_mq_dispatch_rq_list' 'tick_sched_do_timer' 'pipe_double_lock' 'audit_log_start' 'ep_poll' 'page_counter_charge' 'kcm_rfree' 'generic_write_end' 'xas_find_marked' 'poll_schedule_timeout' 'do_exit' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'get_signal' 'find_get_pages_range_tag' 'ktime_get_real_seconds' 'echo_char' 'generic_update_time' '__x64_sys_ptrace' 'generic_fillattr' 'do_nanosleep' 'fsnotify' 'blk_mq_sched_dispatch_requests' 'vfs_readlink' '__synchronize_hardirq' 'generic_file_read_iter' 'kauditd_thread' 'wbt_done' 'tick_nohz_next_event' 'ext4_setattr' 'wbt_issue' '__rb_insert_augmented' [ 63.006477][ T6688] ================================================================== [ 63.014615][ T6688] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 63.022490][ T6688] [ 63.024800][ T6688] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 1: [ 63.032600][ T6688] timekeeping_advance+0x88e/0xd80 [ 63.037736][ T6688] update_wall_time+0x15/0x20 [ 63.042394][ T6688] tick_do_update_jiffies64+0x1e5/0x2a0 [ 63.047963][ T6688] tick_sched_do_timer+0xc7/0xd0 [ 63.052902][ T6688] tick_sched_timer+0x3f/0xd0 [ 63.057558][ T6688] __hrtimer_run_queues+0x271/0x600 [ 63.062735][ T6688] hrtimer_interrupt+0x226/0x490 [ 63.067653][ T6688] smp_apic_timer_interrupt+0xd8/0x270 [ 63.073090][ T6688] apic_timer_interrupt+0xf/0x20 [ 63.078006][ T6688] __tsan_unaligned_write8+0x85/0x110 [ 63.083360][ T6688] tcp_v4_rcv+0x1a47/0x1e10 [ 63.088001][ T6688] ip_protocol_deliver_rcu+0x4b/0x410 [ 63.093383][ T6688] ip_local_deliver_finish+0xf3/0x120 [ 63.098738][ T6688] ip_local_deliver+0x135/0x220 [ 63.103596][ T6688] ip_sublist_rcv_finish+0xf0/0x140 [ 63.108772][ T6688] ip_sublist_rcv+0x3f8/0x530 [ 63.113424][ T6688] ip_list_rcv+0x2f3/0x321 [ 63.117835][ T6688] __netif_receive_skb_list_core+0x368/0x5c0 [ 63.123798][ T6688] netif_receive_skb_list_internal+0x5c7/0x810 [ 63.129930][ T6688] gro_normal_list.part.0+0x37/0xa0 [ 63.135103][ T6688] gro_normal_one+0x14c/0x160 [ 63.139762][ T6688] napi_gro_receive+0x27d/0x2f0 [ 63.144590][ T6688] receive_buf+0x252/0x2ed0 [ 63.149071][ T6688] virtnet_poll+0x343/0x790 [ 63.153559][ T6688] net_rx_action+0x3ad/0xac0 [ 63.158132][ T6688] __do_softirq+0x118/0x34a [ 63.162622][ T6688] run_ksoftirqd+0x41/0x60 [ 63.167016][ T6688] smpboot_thread_fn+0x374/0x4a0 [ 63.171931][ T6688] kthread+0x203/0x230 [ 63.175979][ T6688] ret_from_fork+0x1f/0x30 [ 63.180363][ T6688] [ 63.182672][ T6688] read to 0xffffffff86fce940 of 8 bytes by task 6688 on cpu 0: [ 63.190221][ T6688] ktime_get_seconds+0x42/0x60 [ 63.194978][ T6688] tcp_rcv_established+0xe79/0xee0 [ 63.200131][ T6688] tcp_v4_do_rcv+0x396/0x4f0 [ 63.204708][ T6688] __release_sock+0x130/0x1e0 [ 63.209367][ T6688] release_sock+0x5e/0x160 [ 63.213769][ T6688] tcp_recvmsg+0x68e/0x1ba0 [ 63.218260][ T6688] inet_recvmsg+0xc1/0x250 [ 63.222674][ T6688] sock_recvmsg+0x8e/0xb0 [ 63.226985][ T6688] sock_read_iter+0x185/0x230 [ 63.231646][ T6688] new_sync_read+0x416/0x450 [ 63.236224][ T6688] __vfs_read+0x9e/0xb0 [ 63.240371][ T6688] vfs_read+0x13e/0x2b0 [ 63.244502][ T6688] ksys_read+0x16a/0x1a0 [ 63.248731][ T6688] __x64_sys_read+0x49/0x60 [ 63.253214][ T6688] do_syscall_64+0xc7/0x3b0 [ 63.257694][ T6688] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.263557][ T6688] [ 63.265859][ T6688] Reported by Kernel Concurrency Sanitizer on: [ 63.272000][ T6688] CPU: 0 PID: 6688 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 63.280218][ T6688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.290373][ T6688] ================================================================== [ 63.298414][ T6688] Kernel panic - not syncing: panic_on_warn set ... [ 63.304982][ T6688] CPU: 0 PID: 6688 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 63.313203][ T6688] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 63.323234][ T6688] Call Trace: [ 63.326517][ T6688] dump_stack+0x11d/0x187 [ 63.330829][ T6688] panic+0x210/0x640 [ 63.334708][ T6688] ? vprintk_func+0x89/0x13a [ 63.339292][ T6688] kcsan_report.cold+0xc/0x1a [ 63.343949][ T6688] kcsan_setup_watchpoint+0x3fb/0x440 [ 63.349304][ T6688] ktime_get_seconds+0x42/0x60 [ 63.354048][ T6688] tcp_rcv_established+0xe79/0xee0 [ 63.359156][ T6688] tcp_v4_do_rcv+0x396/0x4f0 [ 63.363739][ T6688] __release_sock+0x130/0x1e0 [ 63.368415][ T6688] release_sock+0x5e/0x160 [ 63.372813][ T6688] tcp_recvmsg+0x68e/0x1ba0 [ 63.377302][ T6688] ? sock_poll+0xfc/0x240 [ 63.381626][ T6688] inet_recvmsg+0xc1/0x250 [ 63.386037][ T6688] ? apparmor_socket_recvmsg+0x38/0x40 [ 63.391478][ T6688] ? inet_sendpage+0xf0/0xf0 [ 63.396056][ T6688] sock_recvmsg+0x8e/0xb0 [ 63.400375][ T6688] sock_read_iter+0x185/0x230 [ 63.405044][ T6688] new_sync_read+0x416/0x450 [ 63.409621][ T6688] __vfs_read+0x9e/0xb0 [ 63.413754][ T6688] vfs_read+0x13e/0x2b0 [ 63.417889][ T6688] ksys_read+0x16a/0x1a0 [ 63.422120][ T6688] __x64_sys_read+0x49/0x60 [ 63.426620][ T6688] do_syscall_64+0xc7/0x3b0 [ 63.431142][ T6688] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 63.437016][ T6688] RIP: 0033:0x47c530 [ 63.440910][ T6688] Code: 8b 7c 24 10 48 8b 74 24 18 48 8b 54 24 20 49 c7 c2 00 00 00 00 49 c7 c0 00 00 00 00 49 c7 c1 00 00 00 00 48 8b 44 24 08 0f 05 <48> 3d 01 f0 ff ff 76 20 48 c7 44 24 28 ff ff ff ff 48 c7 44 24 30 [ 63.460498][ T6688] RSP: 002b:000000c42026f7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 63.468916][ T6688] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 63.476890][ T6688] RDX: 0000000000001000 RSI: 000000c4201c6000 RDI: 0000000000000003 [ 63.484866][ T6688] RBP: 000000c42026f830 R08: 0000000000000000 R09: 0000000000000000 [ 63.492827][ T6688] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000008 [ 63.500789][ T6688] R13: ffffffffffffffff R14: 0000000000000008 R15: ffffffffffffffff [ 63.509889][ T6688] Kernel Offset: disabled [ 63.514225][ T6688] Rebooting in 86400 seconds..