[ 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 '10.128.0.209' (ECDSA) to the list of known hosts. 2020/05/29 00:42:09 fuzzer started 2020/05/29 00:42:09 dialing manager at 10.128.0.105:45871 2020/05/29 00:42:10 syscalls: 3055 2020/05/29 00:42:10 code coverage: enabled 2020/05/29 00:42:10 comparison tracing: enabled 2020/05/29 00:42:10 extra coverage: enabled 2020/05/29 00:42:10 setuid sandbox: enabled 2020/05/29 00:42:10 namespace sandbox: enabled 2020/05/29 00:42:10 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/29 00:42:10 fault injection: enabled 2020/05/29 00:42:10 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/29 00:42:10 net packet injection: enabled 2020/05/29 00:42:10 net device setup: enabled 2020/05/29 00:42:10 concurrency sanitizer: enabled 2020/05/29 00:42:10 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/29 00:42:10 USB emulation: enabled 2020/05/29 00:42:10 adding functions to KCSAN blacklist: 'generic_write_end' 'tick_nohz_idle_stop_tick' 'copy_process' 'find_get_pages_range_tag' 'alloc_pid' syzkaller login: [ 52.096800][ T8925] ================================================================== [ 52.104929][ T8925] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 52.111668][ T8925] [ 52.113983][ T8925] write to 0xffff8881254c0d10 of 8 bytes by interrupt on cpu 1: [ 52.121599][ T8925] ep_poll_callback+0x5f2/0x6c0 [ 52.126434][ T8925] __wake_up_common+0x76/0x180 [ 52.131185][ T8925] __wake_up_common_lock+0x77/0xb0 [ 52.136283][ T8925] sock_def_readable+0x9d/0x130 [ 52.141120][ T8925] tcp_data_ready+0x76/0xc0 [ 52.145611][ T8925] tcp_rcv_established+0xcb8/0xee0 [ 52.150705][ T8925] tcp_v4_do_rcv+0x396/0x4f0 [ 52.155278][ T8925] tcp_v4_rcv+0x1c55/0x1e10 [ 52.159766][ T8925] ip_protocol_deliver_rcu+0x4b/0x410 [ 52.165123][ T8925] ip_local_deliver_finish+0xf3/0x120 [ 52.170491][ T8925] ip_local_deliver+0x135/0x220 [ 52.175326][ T8925] ip_sublist_rcv_finish+0xf0/0x140 [ 52.180507][ T8925] ip_sublist_rcv+0x3f8/0x530 [ 52.185179][ T8925] ip_list_rcv+0x2f3/0x321 [ 52.189581][ T8925] __netif_receive_skb_list_core+0x368/0x5c0 [ 52.195556][ T8925] netif_receive_skb_list_internal+0x5c7/0x810 [ 52.201694][ T8925] gro_normal_list.part.0+0x37/0xa0 [ 52.206874][ T8925] gro_normal_one+0x14c/0x160 [ 52.211535][ T8925] napi_gro_receive+0x27d/0x2f0 [ 52.216371][ T8925] receive_buf+0x24c/0x3420 [ 52.220860][ T8925] virtnet_poll+0x343/0x790 [ 52.225354][ T8925] net_rx_action+0x3ad/0xac0 [ 52.229928][ T8925] __do_softirq+0x118/0x34a [ 52.234414][ T8925] run_ksoftirqd+0x41/0x60 [ 52.238817][ T8925] smpboot_thread_fn+0x374/0x4a0 [ 52.243741][ T8925] kthread+0x203/0x230 [ 52.247790][ T8925] ret_from_fork+0x1f/0x30 [ 52.252182][ T8925] [ 52.254498][ T8925] read to 0xffff8881254c0d10 of 8 bytes by task 8925 on cpu 0: [ 52.262022][ T8925] ep_poll+0x5ad/0x910 [ 52.266074][ T8925] do_epoll_wait+0x15a/0x180 [ 52.270650][ T8925] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.275848][ T8925] do_syscall_64+0xc7/0x3b0 [ 52.280336][ T8925] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.286202][ T8925] [ 52.288508][ T8925] Reported by Kernel Concurrency Sanitizer on: [ 52.294647][ T8925] CPU: 0 PID: 8925 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.302875][ T8925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.312923][ T8925] ================================================================== [ 52.320963][ T8925] Kernel panic - not syncing: panic_on_warn set ... [ 52.327547][ T8925] CPU: 0 PID: 8925 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 52.335761][ T8925] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 52.345814][ T8925] Call Trace: [ 52.349111][ T8925] dump_stack+0x11d/0x187 [ 52.353429][ T8925] panic+0x210/0x640 [ 52.357314][ T8925] ? vprintk_func+0x89/0x13a [ 52.361897][ T8925] kcsan_report.cold+0xc/0x1a [ 52.366567][ T8925] kcsan_setup_watchpoint+0x3fb/0x440 [ 52.371924][ T8925] ep_poll+0x5ad/0x910 [ 52.375984][ T8925] ? wake_up_q+0x90/0x90 [ 52.380223][ T8925] do_epoll_wait+0x15a/0x180 [ 52.384820][ T8925] __x64_sys_epoll_pwait+0xc6/0x170 [ 52.390010][ T8925] do_syscall_64+0xc7/0x3b0 [ 52.394500][ T8925] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 52.400377][ T8925] RIP: 0033:0x469240 [ 52.404278][ T8925] 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 [ 52.424664][ T8925] RSP: 002b:000000c00008f7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 52.433059][ T8925] RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000469240 [ 52.441015][ T8925] RDX: 0000000000000080 RSI: 000000c00008f840 RDI: 0000000000000003 [ 52.448971][ T8925] RBP: 000000c00008fe40 R08: 0000000000000000 R09: 0000000000000000 [ 52.456926][ T8925] R10: 0000000000000003 R11: 0000000000000246 R12: 0000000000000003 [ 52.464879][ T8925] R13: 000000c00009e180 R14: 0000000000000004 R15: 0000000000000002 [ 52.474084][ T8925] Kernel Offset: disabled [ 52.478399][ T8925] Rebooting in 86400 seconds..