[ 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 '10.128.0.56' (ECDSA) to the list of known hosts. 2020/05/18 19:31:25 fuzzer started 2020/05/18 19:31:25 dialing manager at 10.128.0.105:46597 2020/05/18 19:31:26 syscalls: 3055 2020/05/18 19:31:26 code coverage: enabled 2020/05/18 19:31:26 comparison tracing: enabled 2020/05/18 19:31:26 extra coverage: enabled 2020/05/18 19:31:26 setuid sandbox: enabled 2020/05/18 19:31:26 namespace sandbox: enabled 2020/05/18 19:31:26 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/18 19:31:26 fault injection: enabled 2020/05/18 19:31:26 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/18 19:31:26 net packet injection: enabled 2020/05/18 19:31:26 net device setup: enabled 2020/05/18 19:31:26 concurrency sanitizer: enabled 2020/05/18 19:31:26 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/18 19:31:26 USB emulation: enabled syzkaller login: [ 55.659517][ T8920] KCSAN: could not find function: '_find_next_bit' [ 57.347447][ T8920] KCSAN: could not find function: 'poll_schedule_timeout' 2020/05/18 19:31:32 adding functions to KCSAN blacklist: 'copy_process' 'echo_char' 'kauditd_thread' 'do_exit' 'shmem_file_read_iter' 'generic_fillattr' 'tick_sched_do_timer' 'tick_nohz_idle_stop_tick' 'shmem_getpage_gfp' 'kcm_rfree' 'dd_has_work' 'do_nanosleep' 'run_timer_softirq' 'ktime_get_real_seconds' 'decrypt_packet' 'wbt_done' '__mark_inode_dirty' 'generic_write_end' 'find_get_pages_range_tag' 'ep_poll' 'do_signal_stop' 'blk_mq_dispatch_rq_list' 'audit_log_start' '__ext4_new_inode' 'ext4_free_inodes_count' 'fat16_ent_put' '_find_next_bit' 'blk_mq_get_request' 'atime_needs_update' 'page_counter_charge' 'pcpu_alloc' 'ext4_mark_iloc_dirty' '__snd_rawmidi_transmit_ack' 'd_delete' 'io_sq_thread' 'mark_buffer_dirty_inode' 'poll_schedule_timeout' 'xas_clear_mark' 'mod_timer' 'n_tty_receive_buf_common' 'add_timer' 'fasync_remove_entry' 'blk_mq_sched_dispatch_requests' [ 202.998058][ T8922] ================================================================== [ 203.006288][ T8922] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 203.014162][ T8922] [ 203.016490][ T8922] write to 0xffffffff88ae90c8 of 280 bytes by interrupt on cpu 1: [ 203.024278][ T8922] timekeeping_advance+0x88e/0xd80 [ 203.029361][ T8922] update_wall_time+0x15/0x20 [ 203.034011][ T8922] tick_do_update_jiffies64+0x1e5/0x2a0 [ 203.039529][ T8922] tick_sched_do_timer+0xc7/0xd0 [ 203.044438][ T8922] tick_sched_timer+0x3f/0xd0 [ 203.049087][ T8922] __hrtimer_run_queues+0x271/0x600 [ 203.054255][ T8922] hrtimer_interrupt+0x226/0x490 [ 203.059184][ T8922] smp_apic_timer_interrupt+0xd8/0x270 [ 203.064612][ T8922] apic_timer_interrupt+0xf/0x20 [ 203.069524][ T8922] __tsan_read8+0xe4/0x110 [ 203.073917][ T8922] ipt_do_table+0x4a3/0xe70 [ 203.078393][ T8922] iptable_mangle_hook+0x75/0x270 [ 203.083388][ T8922] nf_hook_slow+0x7c/0x160 [ 203.087780][ T8922] ip_local_deliver+0x1f2/0x220 [ 203.092603][ T8922] ip_sublist_rcv_finish+0xf0/0x140 [ 203.097771][ T8922] ip_sublist_rcv+0x3f8/0x530 [ 203.102421][ T8922] ip_list_rcv+0x2f3/0x321 [ 203.106841][ T8922] __netif_receive_skb_list_core+0x368/0x5c0 [ 203.112815][ T8922] netif_receive_skb_list_internal+0x5c7/0x810 [ 203.118959][ T8922] gro_normal_list.part.0+0x37/0xa0 [ 203.124140][ T8922] gro_normal_one+0x14c/0x160 [ 203.128796][ T8922] napi_gro_receive+0x27d/0x2f0 [ 203.133630][ T8922] receive_buf+0x24c/0x3420 [ 203.138144][ T8922] virtnet_poll+0x343/0x790 [ 203.142623][ T8922] net_rx_action+0x3ad/0xac0 [ 203.147190][ T8922] __do_softirq+0x118/0x34a [ 203.151702][ T8922] run_ksoftirqd+0x41/0x60 [ 203.156092][ T8922] smpboot_thread_fn+0x374/0x4a0 [ 203.161001][ T8922] kthread+0x203/0x230 [ 203.165039][ T8922] ret_from_fork+0x1f/0x30 [ 203.169451][ T8922] [ 203.171755][ T8922] read to 0xffffffff88ae9140 of 8 bytes by task 8922 on cpu 0: [ 203.179313][ T8922] ktime_get_seconds+0x42/0x60 [ 203.184050][ T8922] tcp_rcv_established+0xe79/0xee0 [ 203.189149][ T8922] tcp_v4_do_rcv+0x396/0x4f0 [ 203.193741][ T8922] __release_sock+0x130/0x1e0 [ 203.198391][ T8922] release_sock+0x5e/0x160 [ 203.202780][ T8922] tcp_recvmsg+0x68e/0x1ba0 [ 203.207256][ T8922] inet_recvmsg+0xc1/0x250 [ 203.211645][ T8922] sock_recvmsg+0x8e/0xb0 [ 203.215946][ T8922] sock_read_iter+0x185/0x230 [ 203.220597][ T8922] new_sync_read+0x416/0x450 [ 203.225161][ T8922] __vfs_read+0x9e/0xb0 [ 203.229302][ T8922] vfs_read+0x13e/0x2b0 [ 203.233466][ T8922] ksys_read+0x16a/0x1a0 [ 203.237678][ T8922] __x64_sys_read+0x49/0x60 [ 203.242157][ T8922] do_syscall_64+0xc7/0x3b0 [ 203.246634][ T8922] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 203.252493][ T8922] [ 203.254792][ T8922] Reported by Kernel Concurrency Sanitizer on: [ 203.260918][ T8922] CPU: 0 PID: 8922 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 203.269172][ T8922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 203.279203][ T8922] ================================================================== [ 203.287234][ T8922] Kernel panic - not syncing: panic_on_warn set ... [ 203.293803][ T8922] CPU: 0 PID: 8922 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 203.302011][ T8922] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 203.312056][ T8922] Call Trace: [ 203.315327][ T8922] dump_stack+0x11d/0x187 [ 203.319633][ T8922] panic+0x210/0x640 [ 203.323509][ T8922] ? vprintk_func+0x89/0x13a [ 203.328089][ T8922] kcsan_report.cold+0xc/0x1a [ 203.332746][ T8922] kcsan_setup_watchpoint+0x3fb/0x440 [ 203.338095][ T8922] ktime_get_seconds+0x42/0x60 [ 203.342840][ T8922] tcp_rcv_established+0xe79/0xee0 [ 203.347935][ T8922] tcp_v4_do_rcv+0x396/0x4f0 [ 203.352512][ T8922] __release_sock+0x130/0x1e0 [ 203.357165][ T8922] release_sock+0x5e/0x160 [ 203.361554][ T8922] tcp_recvmsg+0x68e/0x1ba0 [ 203.366039][ T8922] inet_recvmsg+0xc1/0x250 [ 203.370449][ T8922] ? apparmor_socket_recvmsg+0x38/0x40 [ 203.375883][ T8922] ? inet_sendpage+0xf0/0xf0 [ 203.380450][ T8922] sock_recvmsg+0x8e/0xb0 [ 203.384757][ T8922] sock_read_iter+0x185/0x230 [ 203.389415][ T8922] new_sync_read+0x416/0x450 [ 203.394002][ T8922] __vfs_read+0x9e/0xb0 [ 203.398136][ T8922] vfs_read+0x13e/0x2b0 [ 203.402265][ T8922] ksys_read+0x16a/0x1a0 [ 203.406481][ T8922] __x64_sys_read+0x49/0x60 [ 203.410960][ T8922] do_syscall_64+0xc7/0x3b0 [ 203.415440][ T8922] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 203.421303][ T8922] RIP: 0033:0x47c530 [ 203.425177][ T8922] 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 [ 203.444752][ T8922] RSP: 002b:000000c4204cf7d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 203.453147][ T8922] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 203.461092][ T8922] RDX: 0000000000001000 RSI: 000000c420362000 RDI: 0000000000000003 [ 203.469036][ T8922] RBP: 000000c4204cf830 R08: 0000000000000000 R09: 0000000000000000 [ 203.476980][ T8922] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000040 [ 203.485008][ T8922] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 203.494119][ T8922] Kernel Offset: disabled [ 203.498431][ T8922] Rebooting in 86400 seconds..