[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ OK ] Started Getty on tty1. [ OK ] Started Serial Getty on ttyS0. [ OK ] Started Getty on tty2. [ 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 '10.128.0.185' (ECDSA) to the list of known hosts. 2020/05/25 12:37:55 fuzzer started 2020/05/25 12:37:56 dialing manager at 10.128.0.105:40969 2020/05/25 12:37:56 syscalls: 3055 2020/05/25 12:37:56 code coverage: enabled 2020/05/25 12:37:56 comparison tracing: enabled 2020/05/25 12:37:56 extra coverage: enabled 2020/05/25 12:37:56 setuid sandbox: enabled 2020/05/25 12:37:56 namespace sandbox: enabled 2020/05/25 12:37:56 Android sandbox: /sys/fs/selinux/policy does not exist 2020/05/25 12:37:56 fault injection: enabled 2020/05/25 12:37:56 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/05/25 12:37:56 net packet injection: enabled 2020/05/25 12:37:56 net device setup: enabled 2020/05/25 12:37:56 concurrency sanitizer: enabled 2020/05/25 12:37:56 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/05/25 12:37:56 USB emulation: enabled 2020/05/25 12:37:56 adding functions to KCSAN blacklist: 'generic_write_end' '__ext4_new_inode' syzkaller login: [ 53.371345][ T8927] ================================================================== [ 53.379469][ T8927] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 53.386216][ T8927] [ 53.388546][ T8927] write to 0xffff8881255c3e90 of 8 bytes by interrupt on cpu 1: [ 53.396309][ T8927] ep_poll_callback+0x5f2/0x6c0 [ 53.401178][ T8927] __wake_up_common+0x76/0x180 [ 53.405925][ T8927] __wake_up_common_lock+0x77/0xb0 [ 53.411300][ T8927] sock_def_readable+0x9d/0x130 [ 53.416152][ T8927] tcp_data_ready+0x76/0xc0 [ 53.420660][ T8927] tcp_rcv_established+0xcb8/0xee0 [ 53.425775][ T8927] tcp_v4_do_rcv+0x396/0x4f0 [ 53.430393][ T8927] tcp_v4_rcv+0x1c55/0x1e10 [ 53.434893][ T8927] ip_protocol_deliver_rcu+0x4b/0x410 [ 53.440362][ T8927] ip_local_deliver_finish+0xf3/0x120 [ 53.445732][ T8927] ip_local_deliver+0x135/0x220 [ 53.450561][ T8927] ip_sublist_rcv_finish+0xf0/0x140 [ 53.455822][ T8927] ip_sublist_rcv+0x3f8/0x530 [ 53.460495][ T8927] ip_list_rcv+0x2f3/0x321 [ 53.464897][ T8927] __netif_receive_skb_list_core+0x368/0x5c0 [ 53.470865][ T8927] netif_receive_skb_list_internal+0x5c7/0x810 [ 53.477002][ T8927] gro_normal_list.part.0+0x37/0xa0 [ 53.482180][ T8927] gro_normal_one+0x14c/0x160 [ 53.487006][ T8927] napi_gro_receive+0x27d/0x2f0 [ 53.491844][ T8927] receive_buf+0x24c/0x3420 [ 53.496342][ T8927] virtnet_poll+0x343/0x790 [ 53.500837][ T8927] net_rx_action+0x3ad/0xac0 [ 53.505406][ T8927] __do_softirq+0x118/0x34a [ 53.509885][ T8927] run_ksoftirqd+0x41/0x60 [ 53.514928][ T8927] smpboot_thread_fn+0x374/0x4a0 [ 53.519861][ T8927] kthread+0x203/0x230 [ 53.523911][ T8927] ret_from_fork+0x1f/0x30 [ 53.528299][ T8927] [ 53.530624][ T8927] read to 0xffff8881255c3e90 of 8 bytes by task 8927 on cpu 0: [ 53.538141][ T8927] ep_poll+0x5ad/0x910 [ 53.542205][ T8927] do_epoll_wait+0x15a/0x180 [ 53.546775][ T8927] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.551948][ T8927] do_syscall_64+0xc7/0x3b0 [ 53.556428][ T8927] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.562302][ T8927] [ 53.564604][ T8927] Reported by Kernel Concurrency Sanitizer on: [ 53.570732][ T8927] CPU: 0 PID: 8927 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.578954][ T8927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.589000][ T8927] ================================================================== [ 53.597042][ T8927] Kernel panic - not syncing: panic_on_warn set ... [ 53.603616][ T8927] CPU: 0 PID: 8927 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 53.611935][ T8927] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 53.622063][ T8927] Call Trace: [ 53.625339][ T8927] dump_stack+0x11d/0x187 [ 53.629675][ T8927] panic+0x210/0x640 [ 53.633560][ T8927] ? vprintk_func+0x89/0x13a [ 53.638175][ T8927] kcsan_report.cold+0xc/0x1a [ 53.642882][ T8927] kcsan_setup_watchpoint+0x3fb/0x440 [ 53.648233][ T8927] ep_poll+0x5ad/0x910 [ 53.652288][ T8927] ? wake_up_q+0x90/0x90 [ 53.656640][ T8927] do_epoll_wait+0x15a/0x180 [ 53.661209][ T8927] ? fput+0x20/0x30 [ 53.665002][ T8927] __x64_sys_epoll_pwait+0xc6/0x170 [ 53.670443][ T8927] do_syscall_64+0xc7/0x3b0 [ 53.674943][ T8927] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 53.681014][ T8927] RIP: 0033:0x45b300 [ 53.684904][ T8927] 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 [ 53.704488][ T8927] RSP: 002b:000000c4202f7860 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 53.712903][ T8927] RAX: ffffffffffffffda RBX: 00000000ffffffff RCX: 000000000045b300 [ 53.720881][ T8927] RDX: 0000000000000080 RSI: 000000c4202f78a0 RDI: 0000000000000004 [ 53.728834][ T8927] RBP: 000000c4202f7ea0 R08: 0000000000000000 R09: 0000000000000000 [ 53.736795][ T8927] R10: 00000000ffffffff R11: 0000000000000246 R12: 0000000000000020 [ 53.744752][ T8927] R13: ffffffffffffffff R14: 0000000000000004 R15: ffffffffffffffff [ 53.758116][ T8927] Kernel Offset: disabled [ 53.762595][ T8927] Rebooting in 86400 seconds..