[ 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 '10.128.1.32' (ECDSA) to the list of known hosts. 2020/04/24 08:42:51 fuzzer started syzkaller login: [ 45.383094][ T6716] ld (6716) used greatest stack depth: 10440 bytes left 2020/04/24 08:42:53 dialing manager at 10.128.0.105:36925 2020/04/24 08:42:54 syscalls: 2960 2020/04/24 08:42:54 code coverage: enabled 2020/04/24 08:42:54 comparison tracing: enabled 2020/04/24 08:42:54 extra coverage: enabled 2020/04/24 08:42:54 setuid sandbox: enabled 2020/04/24 08:42:54 namespace sandbox: enabled 2020/04/24 08:42:54 Android sandbox: /sys/fs/selinux/policy does not exist 2020/04/24 08:42:54 fault injection: enabled 2020/04/24 08:42:54 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/04/24 08:42:54 net packet injection: enabled 2020/04/24 08:42:54 net device setup: enabled 2020/04/24 08:42:54 concurrency sanitizer: enabled 2020/04/24 08:42:54 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/04/24 08:42:54 USB emulation: /dev/raw-gadget does not exist [ 46.524798][ T6722] KCSAN: could not find function: '_find_next_bit' [ 48.538363][ T6722] KCSAN: could not find function: 'poll_schedule_timeout' 2020/04/24 08:42:58 adding functions to KCSAN blacklist: 'timer_clear_idle' 'generic_file_read_iter' 'page_counter_charge' 'blk_mq_dispatch_rq_list' 'alloc_pid' 'generic_fillattr' '_find_next_bit' 'ep_poll' 'blk_mq_get_request' 'tick_nohz_idle_stop_tick' 'ext4_free_inodes_count' 'audit_log_start' 'shmem_getpage_gfp' 'dd_has_work' 'add_timer' '__filemap_fdatawrite_range' '__find_get_block' 'do_exit' 'pipe_double_lock' '__add_to_page_cache_locked' 'exit_signals' 'generic_write_end' 'blk_mq_sched_dispatch_requests' '__delete_from_page_cache' '__mark_inode_dirty' 'xas_clear_mark' 'ext4_mb_good_group' 'tick_sched_do_timer' 'poll_schedule_timeout' 'pcpu_alloc' 'do_nanosleep' 'ktime_get_real_seconds' 'ext4_mark_iloc_dirty' 'find_get_pages_range_tag' 'do_syslog' 'do_signal_stop' 'copy_process' 'wbt_issue' 'shmem_file_read_iter' 'mod_timer' '__ext4_new_inode' 'echo_char' 'run_timer_softirq' 'kauditd_thread' [ 223.991990][ T6719] ================================================================== [ 224.000162][ T6719] BUG: KCSAN: data-race in ktime_get_seconds / timekeeping_advance [ 224.008080][ T6719] [ 224.010398][ T6719] write to 0xffffffff86fce8c8 of 280 bytes by interrupt on cpu 0: [ 224.018193][ T6719] timekeeping_advance+0x88e/0xd80 [ 224.023290][ T6719] update_wall_time+0x15/0x20 [ 224.027950][ T6719] tick_do_update_jiffies64+0x1e5/0x2a0 [ 224.033485][ T6719] tick_sched_do_timer+0xc7/0xd0 [ 224.038396][ T6719] tick_sched_timer+0x3f/0xd0 [ 224.043183][ T6719] __hrtimer_run_queues+0x271/0x600 [ 224.048364][ T6719] hrtimer_interrupt+0x226/0x490 [ 224.053283][ T6719] smp_apic_timer_interrupt+0xd8/0x270 [ 224.058745][ T6719] apic_timer_interrupt+0xf/0x20 [ 224.063680][ T6719] __tsan_read8+0xe4/0x110 [ 224.068078][ T6719] __inet_lookup_established+0x2a5/0x410 [ 224.073690][ T6719] tcp_v4_rcv+0x9d1/0x1e10 [ 224.078083][ T6719] ip_protocol_deliver_rcu+0x4b/0x410 [ 224.083430][ T6719] ip_local_deliver_finish+0xf3/0x120 [ 224.088812][ T6719] ip_local_deliver+0x135/0x220 [ 224.093641][ T6719] ip_sublist_rcv_finish+0xf0/0x140 [ 224.099035][ T6719] ip_sublist_rcv+0x3f8/0x530 [ 224.103935][ T6719] ip_list_rcv+0x2f3/0x321 [ 224.108344][ T6719] __netif_receive_skb_list_core+0x368/0x5c0 [ 224.114306][ T6719] netif_receive_skb_list_internal+0x5c7/0x810 [ 224.120438][ T6719] gro_normal_list.part.0+0x37/0xa0 [ 224.125640][ T6719] gro_normal_one+0x14c/0x160 [ 224.130305][ T6719] napi_gro_receive+0x27d/0x2f0 [ 224.135146][ T6719] receive_buf+0x252/0x2ed0 [ 224.139645][ T6719] virtnet_poll+0x343/0x790 [ 224.144148][ T6719] net_rx_action+0x3ad/0xac0 [ 224.148734][ T6719] __do_softirq+0x118/0x34a [ 224.153219][ T6719] run_ksoftirqd+0x41/0x60 [ 224.157629][ T6719] smpboot_thread_fn+0x374/0x4a0 [ 224.162622][ T6719] kthread+0x203/0x230 [ 224.166697][ T6719] ret_from_fork+0x1f/0x30 [ 224.171086][ T6719] [ 224.173419][ T6719] read to 0xffffffff86fce940 of 8 bytes by task 6719 on cpu 1: [ 224.180944][ T6719] ktime_get_seconds+0x42/0x60 [ 224.185703][ T6719] tcp_rcv_established+0xe79/0xee0 [ 224.190790][ T6719] tcp_v4_do_rcv+0x396/0x4f0 [ 224.195357][ T6719] __release_sock+0x130/0x1e0 [ 224.200009][ T6719] release_sock+0x5e/0x160 [ 224.204399][ T6719] tcp_recvmsg+0x68e/0x1ba0 [ 224.208877][ T6719] inet_recvmsg+0xc1/0x250 [ 224.213268][ T6719] sock_recvmsg+0x8e/0xb0 [ 224.217634][ T6719] sock_read_iter+0x185/0x230 [ 224.222298][ T6719] new_sync_read+0x416/0x450 [ 224.226866][ T6719] __vfs_read+0x9e/0xb0 [ 224.231029][ T6719] vfs_read+0x13e/0x2b0 [ 224.235178][ T6719] ksys_read+0x16a/0x1a0 [ 224.239397][ T6719] __x64_sys_read+0x49/0x60 [ 224.243876][ T6719] do_syscall_64+0xc7/0x3b0 [ 224.248356][ T6719] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 224.254213][ T6719] [ 224.256513][ T6719] Reported by Kernel Concurrency Sanitizer on: [ 224.262845][ T6719] CPU: 1 PID: 6719 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 224.271057][ T6719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 224.281113][ T6719] ================================================================== [ 224.289171][ T6719] Kernel panic - not syncing: panic_on_warn set ... [ 224.295750][ T6719] CPU: 1 PID: 6719 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 224.303962][ T6719] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 224.313990][ T6719] Call Trace: [ 224.317295][ T6719] dump_stack+0x11d/0x187 [ 224.321603][ T6719] panic+0x210/0x640 [ 224.325486][ T6719] ? vprintk_func+0x89/0x13a [ 224.330248][ T6719] kcsan_report.cold+0xc/0x1a [ 224.334926][ T6719] kcsan_setup_watchpoint+0x3fb/0x440 [ 224.340301][ T6719] ktime_get_seconds+0x42/0x60 [ 224.345059][ T6719] tcp_rcv_established+0xe79/0xee0 [ 224.350172][ T6719] tcp_v4_do_rcv+0x396/0x4f0 [ 224.354746][ T6719] __release_sock+0x130/0x1e0 [ 224.359402][ T6719] release_sock+0x5e/0x160 [ 224.363813][ T6719] tcp_recvmsg+0x68e/0x1ba0 [ 224.368299][ T6719] ? sock_poll+0xfc/0x240 [ 224.372635][ T6719] inet_recvmsg+0xc1/0x250 [ 224.377051][ T6719] ? apparmor_socket_recvmsg+0x38/0x40 [ 224.382504][ T6719] ? inet_sendpage+0xf0/0xf0 [ 224.387090][ T6719] sock_recvmsg+0x8e/0xb0 [ 224.391400][ T6719] sock_read_iter+0x185/0x230 [ 224.396073][ T6719] new_sync_read+0x416/0x450 [ 224.400766][ T6719] __vfs_read+0x9e/0xb0 [ 224.404916][ T6719] vfs_read+0x13e/0x2b0 [ 224.409056][ T6719] ksys_read+0x16a/0x1a0 [ 224.413298][ T6719] __x64_sys_read+0x49/0x60 [ 224.417784][ T6719] do_syscall_64+0xc7/0x3b0 [ 224.422268][ T6719] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 224.428133][ T6719] RIP: 0033:0x47c530 [ 224.432028][ T6719] 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 [ 224.451642][ T6719] RSP: 002b:000000c434c587d8 EFLAGS: 00000212 ORIG_RAX: 0000000000000000 [ 224.460054][ T6719] RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 000000000047c530 [ 224.468136][ T6719] RDX: 0000000000001000 RSI: 000000c4200a8000 RDI: 0000000000000003 [ 224.476194][ T6719] RBP: 000000c434c58830 R08: 0000000000000000 R09: 0000000000000000 [ 224.484165][ T6719] R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000010 [ 224.492213][ T6719] R13: ffffffffffffffff R14: 0000000000000002 R15: ffffffffffffffff [ 224.501499][ T6719] Kernel Offset: disabled [ 224.505824][ T6719] Rebooting in 86400 seconds..