[ OK ] Started Getty on tty2. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ 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. Starting Load/Save RF Kill Switch Status... [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.0.77' (ECDSA) to the list of known hosts. 2020/06/14 11:15:39 fuzzer started 2020/06/14 11:15:39 dialing manager at 10.128.0.105:36539 2020/06/14 11:15:39 syscalls: 3085 2020/06/14 11:15:39 code coverage: enabled 2020/06/14 11:15:39 comparison tracing: enabled 2020/06/14 11:15:39 extra coverage: enabled 2020/06/14 11:15:39 setuid sandbox: enabled 2020/06/14 11:15:39 namespace sandbox: enabled 2020/06/14 11:15:39 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/14 11:15:39 fault injection: enabled 2020/06/14 11:15:39 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/14 11:15:39 net packet injection: enabled 2020/06/14 11:15:39 net device setup: enabled 2020/06/14 11:15:39 concurrency sanitizer: enabled 2020/06/14 11:15:39 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/14 11:15:39 USB emulation: enabled 2020/06/14 11:15:39 adding functions to KCSAN blacklist: 'find_get_pages_range_tag' '__send_signal' syzkaller login: [ 51.895205][ T8936] ================================================================== [ 51.903309][ T8936] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 51.910289][ T8936] [ 51.912605][ T8936] write to 0xffff888120148b90 of 8 bytes by interrupt on cpu 0: [ 51.920289][ T8936] ep_poll_callback+0x5f2/0x6c0 [ 51.925129][ T8936] __wake_up_common+0x76/0x180 [ 51.929885][ T8936] __wake_up_common_lock+0x77/0xb0 [ 51.934994][ T8936] sock_def_readable+0x9d/0x130 [ 51.939824][ T8936] tcp_data_ready+0x76/0xc0 [ 51.944324][ T8936] tcp_rcv_established+0xcb8/0xee0 [ 51.949517][ T8936] tcp_v4_do_rcv+0x396/0x4f0 [ 51.954096][ T8936] tcp_v4_rcv+0x1c55/0x1e10 [ 51.958590][ T8936] ip_protocol_deliver_rcu+0x4b/0x410 [ 51.963936][ T8936] ip_local_deliver_finish+0xf3/0x120 [ 51.969283][ T8936] ip_local_deliver+0x135/0x220 [ 51.974108][ T8936] ip_sublist_rcv_finish+0xf0/0x140 [ 51.979281][ T8936] ip_sublist_rcv+0x3f8/0x530 [ 51.983933][ T8936] ip_list_rcv+0x2f3/0x321 [ 51.988325][ T8936] __netif_receive_skb_list_core+0x368/0x5c0 [ 51.994295][ T8936] netif_receive_skb_list_internal+0x5c7/0x810 [ 52.000426][ T8936] gro_normal_list.part.0+0x37/0xa0 [ 52.005599][ T8936] gro_normal_one+0x14c/0x160 [ 52.010259][ T8936] napi_gro_receive+0x27d/0x2f0 [ 52.015084][ T8936] receive_buf+0x24c/0x3420 [ 52.019563][ T8936] virtnet_poll+0x343/0x790 [ 52.024041][ T8936] net_rx_action+0x3ad/0xac0 [ 52.028618][ T8936] __do_softirq+0x118/0x34a [ 52.033096][ T8936] run_ksoftirqd+0x41/0x60 [ 52.037483][ T8936] smpboot_thread_fn+0x374/0x4a0 [ 52.042393][ T8936] kthread+0x203/0x230 [ 52.046443][ T8936] ret_from_fork+0x1f/0x30 [ 52.050912][ T8936] [ 52.053220][ T8936] read to 0xffff888120148b90 of 8 bytes by task 8936 on cpu 1: [ 52.060832][ T8936] ep_poll+0x5ad/0x910 [ 52.064874][ T8936] do_epoll_wait+0x15a/0x180 [ 52.069446][ T8936] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.074630][ T8936] do_syscall_64+0xc7/0x3b0 [ 52.079119][ T8936] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.084983][ T8936] [ 52.087566][ T8936] Reported by Kernel Concurrency Sanitizer on: [ 52.094040][ T8936] CPU: 1 PID: 8936 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.102374][ T8936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.113178][ T8936] ================================================================== [ 52.123297][ T8936] Kernel panic - not syncing: panic_on_warn set ... [ 52.130920][ T8936] CPU: 1 PID: 8936 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.140354][ T8936] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.150383][ T8936] Call Trace: [ 52.153652][ T8936] dump_stack+0x11d/0x187 [ 52.157960][ T8936] panic+0x210/0x640 [ 52.161839][ T8936] ? vprintk_func+0x89/0x13a [ 52.166408][ T8936] kcsan_report.cold+0xc/0x1a [ 52.171078][ T8936] kcsan_setup_watchpoint+0x3fb/0x440 [ 52.176446][ T8936] ep_poll+0x5ad/0x910 [ 52.180504][ T8936] ? wake_up_q+0x90/0x90 [ 52.184723][ T8936] do_epoll_wait+0x15a/0x180 [ 52.189288][ T8936] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.194477][ T8936] do_syscall_64+0xc7/0x3b0 [ 52.198968][ T8936] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.204832][ T8936] RIP: 0033:0x469240 [ 52.208713][ T8936] 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 [ 52.229116][ T8936] RSP: 002b:000000c00004b7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 52.237511][ T8936] RAX: ffffffffffffffda RBX: 00000000000003b6 RCX: 0000000000469240 [ 52.245471][ T8936] RDX: 0000000000000080 RSI: 000000c00004b840 RDI: 0000000000000003 [ 52.253511][ T8936] RBP: 000000c00004be40 R08: 0000000000000000 R09: 0000000000000000 [ 52.261564][ T8936] R10: 00000000000003b6 R11: 0000000000000246 R12: 0000000000000003 [ 52.269525][ T8936] R13: 000000c0000ab080 R14: 0000000000000004 R15: 0000000000000002 [ 52.278785][ T8936] Kernel Offset: disabled [ 52.283121][ T8936] Rebooting in 86400 seconds..