[ 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 '10.128.1.0' (ECDSA) to the list of known hosts. 2020/06/11 00:28:44 fuzzer started 2020/06/11 00:28:44 dialing manager at 10.128.0.105:37751 2020/06/11 00:28:44 syscalls: 3078 2020/06/11 00:28:44 code coverage: enabled 2020/06/11 00:28:44 comparison tracing: enabled 2020/06/11 00:28:44 extra coverage: enabled 2020/06/11 00:28:44 setuid sandbox: enabled 2020/06/11 00:28:44 namespace sandbox: enabled 2020/06/11 00:28:44 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/11 00:28:44 fault injection: enabled 2020/06/11 00:28:44 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/11 00:28:44 net packet injection: enabled 2020/06/11 00:28:44 net device setup: enabled 2020/06/11 00:28:44 concurrency sanitizer: enabled 2020/06/11 00:28:44 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/11 00:28:44 USB emulation: enabled 2020/06/11 00:28:44 adding functions to KCSAN blacklist: 'run_timer_softirq' 'alloc_pid' syzkaller login: [ 49.855595][ T8898] ================================================================== [ 49.863736][ T8898] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 49.870538][ T8898] [ 49.872848][ T8898] write to 0xffff888126b321d0 of 8 bytes by interrupt on cpu 0: [ 49.880457][ T8898] ep_poll_callback+0x5f2/0x6c0 [ 49.885351][ T8898] __wake_up_common+0x76/0x180 [ 49.890091][ T8898] __wake_up_common_lock+0x77/0xb0 [ 49.895223][ T8898] sock_def_readable+0x9d/0x130 [ 49.900086][ T8898] tcp_data_ready+0x76/0xc0 [ 49.904591][ T8898] tcp_rcv_established+0xcb8/0xee0 [ 49.909897][ T8898] tcp_v4_do_rcv+0x396/0x4f0 [ 49.914459][ T8898] tcp_v4_rcv+0x1c55/0x1e10 [ 49.918960][ T8898] ip_protocol_deliver_rcu+0x4b/0x410 [ 49.924327][ T8898] ip_local_deliver_finish+0xf3/0x120 [ 49.929683][ T8898] ip_local_deliver+0x135/0x220 [ 49.934519][ T8898] ip_sublist_rcv_finish+0xf0/0x140 [ 49.939693][ T8898] ip_sublist_rcv+0x3f8/0x530 [ 49.944354][ T8898] ip_list_rcv+0x2f3/0x321 [ 49.948856][ T8898] __netif_receive_skb_list_core+0x368/0x5c0 [ 49.954808][ T8898] netif_receive_skb_list_internal+0x5c7/0x810 [ 49.960937][ T8898] gro_normal_list.part.0+0x37/0xa0 [ 49.966110][ T8898] gro_normal_one+0x14c/0x160 [ 49.970761][ T8898] napi_gro_receive+0x27d/0x2f0 [ 49.975587][ T8898] receive_buf+0x24c/0x3420 [ 49.980067][ T8898] virtnet_poll+0x343/0x790 [ 49.984545][ T8898] net_rx_action+0x3ad/0xac0 [ 49.989125][ T8898] __do_softirq+0x118/0x34a [ 49.993603][ T8898] run_ksoftirqd+0x41/0x60 [ 49.998009][ T8898] smpboot_thread_fn+0x374/0x4a0 [ 50.002942][ T8898] kthread+0x203/0x230 [ 50.006986][ T8898] ret_from_fork+0x1f/0x30 [ 50.011380][ T8898] [ 50.013699][ T8898] read to 0xffff888126b321d0 of 8 bytes by task 8898 on cpu 1: [ 50.021214][ T8898] ep_poll+0x473/0x910 [ 50.025257][ T8898] do_epoll_wait+0x15a/0x180 [ 50.029822][ T8898] __x64_sys_epoll_pwait+0xc6/0x170 [ 50.035010][ T8898] do_syscall_64+0xc7/0x3b0 [ 50.039490][ T8898] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.045348][ T8898] [ 50.047665][ T8898] Reported by Kernel Concurrency Sanitizer on: [ 50.053806][ T8898] CPU: 1 PID: 8898 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.062112][ T8898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.072302][ T8898] ================================================================== [ 50.080342][ T8898] Kernel panic - not syncing: panic_on_warn set ... [ 50.086919][ T8898] CPU: 1 PID: 8898 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 50.095125][ T8898] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 50.105166][ T8898] Call Trace: [ 50.108439][ T8898] dump_stack+0x11d/0x187 [ 50.113723][ T8898] panic+0x210/0x640 [ 50.117612][ T8898] ? vprintk_func+0x89/0x13a [ 50.122369][ T8898] kcsan_report.cold+0xc/0x1a [ 50.127125][ T8898] kcsan_setup_watchpoint+0x3fb/0x440 [ 50.132484][ T8898] ep_poll+0x473/0x910 [ 50.136537][ T8898] ? __fget_light+0xc0/0x1a0 [ 50.141119][ T8898] do_epoll_wait+0x15a/0x180 [ 50.145688][ T8898] __x64_sys_epoll_pwait+0xc6/0x170 [ 50.150867][ T8898] do_syscall_64+0xc7/0x3b0 [ 50.155350][ T8898] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 50.161217][ T8898] RIP: 0033:0x469240 [ 50.165095][ T8898] 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 [ 50.189124][ T8898] RSP: 002b:00007ffe4a1f8790 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 50.197515][ T8898] RAX: ffffffffffffffda RBX: 00000000000000ac RCX: 0000000000469240 [ 50.205597][ T8898] RDX: 0000000000000080 RSI: 00007ffe4a1f87e0 RDI: 0000000000000003 [ 50.213589][ T8898] RBP: 00007ffe4a1f8de0 R08: 0000000000000000 R09: 0000000000000000 [ 50.221542][ T8898] R10: 00000000000000ac R11: 0000000000000246 R12: 0000000000000003 [ 50.229489][ T8898] R13: 00000000016b6160 R14: 0000000000000010 R15: 0000000000000008 [ 50.238720][ T8898] Kernel Offset: disabled [ 50.243049][ T8898] Rebooting in 86400 seconds..