[ OK ] Started Serial Getty on ttyS0. [ OK ] Reached target Login Prompts. [ OK ] Listening on Load/Save RF Kill Switch Status /dev/rfkill Watch. [ 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. [ 44.859241][ T8837] bash (8837) used greatest stack depth: 10440 bytes left Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.10.11' (ECDSA) to the list of known hosts. 2020/06/06 01:17:39 fuzzer started 2020/06/06 01:17:39 dialing manager at 10.128.0.105:35423 2020/06/06 01:17:40 syscalls: 3055 2020/06/06 01:17:40 code coverage: enabled 2020/06/06 01:17:40 comparison tracing: enabled 2020/06/06 01:17:40 extra coverage: enabled 2020/06/06 01:17:40 setuid sandbox: enabled 2020/06/06 01:17:40 namespace sandbox: enabled 2020/06/06 01:17:40 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/06 01:17:40 fault injection: enabled 2020/06/06 01:17:40 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/06 01:17:40 net packet injection: enabled 2020/06/06 01:17:40 net device setup: enabled 2020/06/06 01:17:40 concurrency sanitizer: enabled 2020/06/06 01:17:40 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/06 01:17:40 USB emulation: enabled 2020/06/06 01:17:40 adding functions to KCSAN blacklist: 'alloc_pid' 'run_timer_softirq' 'wbt_done' 'find_get_pages_range_tag' 'copy_process' syzkaller login: [ 56.004578][ T8929] ================================================================== [ 56.012681][ T8929] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 56.019462][ T8929] [ 56.021769][ T8929] write to 0xffff888121aba7d0 of 8 bytes by interrupt on cpu 0: [ 56.029376][ T8929] ep_poll_callback+0x5f2/0x6c0 [ 56.034201][ T8929] __wake_up_common+0x76/0x180 [ 56.038939][ T8929] __wake_up_common_lock+0x77/0xb0 [ 56.044027][ T8929] sock_def_readable+0x9d/0x130 [ 56.048855][ T8929] tcp_data_ready+0x76/0xc0 [ 56.053333][ T8929] tcp_rcv_established+0xcb8/0xee0 [ 56.058415][ T8929] tcp_v4_do_rcv+0x396/0x4f0 [ 56.062978][ T8929] tcp_v4_rcv+0x1c55/0x1e10 [ 56.067456][ T8929] ip_protocol_deliver_rcu+0x4b/0x410 [ 56.072816][ T8929] ip_local_deliver_finish+0xf3/0x120 [ 56.078163][ T8929] ip_local_deliver+0x135/0x220 [ 56.083005][ T8929] ip_sublist_rcv_finish+0xf0/0x140 [ 56.088178][ T8929] ip_sublist_rcv+0x3f8/0x530 [ 56.092833][ T8929] ip_list_rcv+0x2f3/0x321 [ 56.097227][ T8929] __netif_receive_skb_list_core+0x368/0x5c0 [ 56.103196][ T8929] netif_receive_skb_list_internal+0x5c7/0x810 [ 56.109346][ T8929] gro_normal_list.part.0+0x37/0xa0 [ 56.114519][ T8929] gro_normal_one+0x14c/0x160 [ 56.119220][ T8929] napi_gro_receive+0x27d/0x2f0 [ 56.124045][ T8929] receive_buf+0x24c/0x3420 [ 56.128579][ T8929] virtnet_poll+0x343/0x790 [ 56.133105][ T8929] net_rx_action+0x3ad/0xac0 [ 56.137715][ T8929] __do_softirq+0x118/0x34a [ 56.142202][ T8929] run_ksoftirqd+0x41/0x60 [ 56.146609][ T8929] smpboot_thread_fn+0x374/0x4a0 [ 56.151522][ T8929] kthread+0x203/0x230 [ 56.155577][ T8929] ret_from_fork+0x1f/0x30 [ 56.159959][ T8929] [ 56.162265][ T8929] read to 0xffff888121aba7d0 of 8 bytes by task 8929 on cpu 1: [ 56.169781][ T8929] ep_poll+0x8f/0x910 [ 56.173740][ T8929] do_epoll_wait+0x15a/0x180 [ 56.178344][ T8929] __x64_sys_epoll_pwait+0xc6/0x170 [ 56.183518][ T8929] do_syscall_64+0xc7/0x3b0 [ 56.188012][ T8929] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.193883][ T8929] [ 56.196182][ T8929] Reported by Kernel Concurrency Sanitizer on: [ 56.202308][ T8929] CPU: 1 PID: 8929 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.210524][ T8929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.220551][ T8929] ================================================================== [ 56.228585][ T8929] Kernel panic - not syncing: panic_on_warn set ... [ 56.235147][ T8929] CPU: 1 PID: 8929 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 56.243362][ T8929] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 56.253389][ T8929] Call Trace: [ 56.256656][ T8929] dump_stack+0x11d/0x187 [ 56.260962][ T8929] panic+0x210/0x640 [ 56.264848][ T8929] ? vprintk_func+0x89/0x13a [ 56.269418][ T8929] kcsan_report.cold+0xc/0x1a [ 56.274165][ T8929] kcsan_setup_watchpoint+0x3fb/0x440 [ 56.279532][ T8929] ep_poll+0x8f/0x910 [ 56.283506][ T8929] ? __fget_files+0xa2/0x1c0 [ 56.288080][ T8929] ? __fget_light+0xc0/0x1a0 [ 56.292649][ T8929] do_epoll_wait+0x15a/0x180 [ 56.297231][ T8929] __x64_sys_epoll_pwait+0xc6/0x170 [ 56.302410][ T8929] do_syscall_64+0xc7/0x3b0 [ 56.306900][ T8929] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 56.312851][ T8929] RIP: 0033:0x469240 [ 56.316743][ T8929] Code: 0f 05 89 44 24 20 c3 cc cc cc 8b 7c 24 08 48 8b 74 24 10 8b 54 24 18 44 8b 54 24 1c 49 c7 c0 00 00 00 00 b8 19 01 00 00 0f 05 <89> 44 24 20 c3 cc cc cc cc cc cc cc cc cc cc cc 8b 7c 24 08 48 c7 [ 56.336349][ T8929] RSP: 002b:00007ffc89b25430 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 56.344749][ T8929] RAX: ffffffffffffffda RBX: 0000000000000111 RCX: 0000000000469240 [ 56.352718][ T8929] RDX: 0000000000000080 RSI: 00007ffc89b25480 RDI: 0000000000000003 [ 56.360677][ T8929] RBP: 00007ffc89b25a80 R08: 0000000000000000 R09: 0000000000000000 [ 56.368625][ T8929] R10: 0000000000000111 R11: 0000000000000246 R12: 0000000000000003 [ 56.376573][ T8929] R13: 0000000001682b80 R14: 0000000000000002 R15: 0000000000000002 [ 56.385775][ T8929] Kernel Offset: disabled [ 56.390088][ T8929] Rebooting in 86400 seconds..