[ OK ] Reached target Graphical Interface. Starting Update UTMP about System Runlevel Changes... Starting Load/Save RF Kill Switch Status... [ OK ] Started Update UTMP about System Runlevel Changes. [ OK ] Started Load/Save RF Kill Switch Status. Debian GNU/Linux 9 syzkaller ttyS0 Warning: Permanently added '10.128.1.38' (ECDSA) to the list of known hosts. 2020/05/25 00:38:17 fuzzer started 2020/05/25 00:38:17 dialing manager at 10.128.0.105:37929 2020/05/25 00:38:18 syscalls: 3055 2020/05/25 00:38:18 code coverage: enabled 2020/05/25 00:38:18 comparison tracing: enabled 2020/05/25 00:38:18 extra coverage: enabled 2020/05/25 00:38:18 setuid sandbox: enabled 2020/05/25 00:38:18 namespace sandbox: enabled 2020/05/25 00:38:18 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/25 00:38:18 fault injection: enabled 2020/05/25 00:38:18 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/25 00:38:18 net packet injection: enabled 2020/05/25 00:38:18 net device setup: enabled 2020/05/25 00:38:18 concurrency sanitizer: enabled 2020/05/25 00:38:18 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/25 00:38:18 USB emulation: enabled 2020/05/25 00:38:18 adding functions to KCSAN blacklist: 'blk_mq_sched_dispatch_requests' 'find_get_pages_range_tag' syzkaller login: [ 54.749002][ T8910] ================================================================== [ 54.765931][ T8910] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 54.780796][ T8910] [ 54.786638][ T8910] write to 0xffff88812b17aad0 of 8 bytes by interrupt on cpu 0: [ 54.801343][ T8910] ep_poll_callback+0x5f2/0x6c0 [ 54.810570][ T8910] __wake_up_common+0x76/0x180 [ 54.817094][ T8910] __wake_up_common_lock+0x77/0xb0 [ 54.823741][ T8910] sock_def_readable+0x9d/0x130 [ 54.831639][ T8910] tcp_data_ready+0x76/0xc0 [ 54.838828][ T8910] tcp_rcv_established+0xcb8/0xee0 [ 54.847878][ T8910] tcp_v4_do_rcv+0x396/0x4f0 [ 54.857569][ T8910] tcp_v4_rcv+0x1c55/0x1e10 [ 54.865869][ T8910] ip_protocol_deliver_rcu+0x4b/0x410 [ 54.878905][ T8910] ip_local_deliver_finish+0xf3/0x120 [ 54.894613][ T8910] ip_local_deliver+0x135/0x220 [ 54.904581][ T8910] ip_sublist_rcv_finish+0xf0/0x140 [ 54.915483][ T8910] ip_sublist_rcv+0x3f8/0x530 [ 54.930545][ T8910] ip_list_rcv+0x2f3/0x321 [ 54.943345][ T8910] __netif_receive_skb_list_core+0x368/0x5c0 [ 54.954478][ T8910] netif_receive_skb_list_internal+0x5c7/0x810 [ 54.966926][ T8910] gro_normal_list.part.0+0x37/0xa0 [ 54.973720][ T8910] gro_normal_one+0x14c/0x160 [ 54.980415][ T8910] napi_gro_receive+0x27d/0x2f0 [ 54.988191][ T8910] receive_buf+0x24c/0x3420 [ 54.996577][ T8910] virtnet_poll+0x343/0x790 [ 55.006604][ T8910] net_rx_action+0x3ad/0xac0 [ 55.016762][ T8910] __do_softirq+0x118/0x34a [ 55.027295][ T8910] irq_exit+0xb5/0xd0 [ 55.037931][ T8910] do_IRQ+0x7b/0x120 [ 55.048290][ T8910] ret_from_intr+0x0/0x21 [ 55.060290][ T8910] native_safe_halt+0xe/0x10 [ 55.066441][ T8910] default_idle+0x21/0x170 [ 55.073931][ T8910] do_idle+0x1b7/0x290 [ 55.078495][ T8910] cpu_startup_entry+0x14/0x20 [ 55.083577][ T8910] rest_init+0xe4/0xeb [ 55.087870][ T8910] arch_call_rest_init+0x13/0x2b [ 55.093296][ T8910] start_kernel+0x7fe/0x823 [ 55.098768][ T8910] secondary_startup_64+0xa4/0xb0 [ 55.105584][ T8910] [ 55.110896][ T8910] read to 0xffff88812b17aad0 of 8 bytes by task 8910 on cpu 1: [ 55.122683][ T8910] ep_poll+0x8f/0x910 [ 55.127366][ T8910] do_epoll_wait+0x15a/0x180 [ 55.134912][ T8910] __x64_sys_epoll_pwait+0xc6/0x170 [ 55.141105][ T8910] do_syscall_64+0xc7/0x3b0 [ 55.146498][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.153063][ T8910] [ 55.156670][ T8910] Reported by Kernel Concurrency Sanitizer on: [ 55.165660][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 55.175801][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.188702][ T8910] ================================================================== [ 55.197209][ T8910] Kernel panic - not syncing: panic_on_warn set ... [ 55.204276][ T8910] CPU: 1 PID: 8910 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 55.214232][ T8910] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 55.226815][ T8910] Call Trace: [ 55.233243][ T8910] dump_stack+0x11d/0x187 [ 55.244620][ T8910] panic+0x210/0x640 [ 55.252453][ T8910] ? vprintk_func+0x89/0x13a [ 55.257876][ T8910] kcsan_report.cold+0xc/0x1a [ 55.263530][ T8910] kcsan_setup_watchpoint+0x3fb/0x440 [ 55.269621][ T8910] ep_poll+0x8f/0x910 [ 55.275027][ T8910] ? __fget_files+0xa2/0x1c0 [ 55.280038][ T8910] ? __fget_light+0xc0/0x1a0 [ 55.284713][ T8910] do_epoll_wait+0x15a/0x180 [ 55.289731][ T8910] ? fput+0x20/0x30 [ 55.293742][ T8910] __x64_sys_epoll_pwait+0xc6/0x170 [ 55.298934][ T8910] do_syscall_64+0xc7/0x3b0 [ 55.303753][ T8910] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 55.310408][ T8910] RIP: 0033:0x45b300 [ 55.314299][ T8910] 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 [ 55.335198][ T8910] RSP: 002b:000000c420051860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 55.347240][ T8910] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 55.356120][ T8910] RDX: 0000000000000080 RSI: 000000c4200518a0 RDI: 0000000000000004 [ 55.364379][ T8910] RBP: 000000c420051ea0 R08: 0000000000000000 R09: 0000000000000000 [ 55.373626][ T8910] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000020 [ 55.382484][ T8910] R13: ffffffffffffffff R14: 0000000000000010 R15: ffffffffffffffff [ 55.396578][ T8910] Kernel Offset: disabled [ 55.405669][ T8910] Rebooting in 86400 seconds..