[ OK ] Started Getty on tty4. [ OK ] Started Getty on tty3. [ 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 '10.128.0.132' (ECDSA) to the list of known hosts. 2020/06/04 13:08:02 fuzzer started 2020/06/04 13:08:02 dialing manager at 10.128.0.105:43989 2020/06/04 13:08:02 syscalls: 3055 2020/06/04 13:08:02 code coverage: enabled 2020/06/04 13:08:02 comparison tracing: enabled 2020/06/04 13:08:02 extra coverage: enabled 2020/06/04 13:08:02 setuid sandbox: enabled 2020/06/04 13:08:02 namespace sandbox: enabled 2020/06/04 13:08:02 Android sandbox: /sys/fs/selinux/policy does not exist 2020/06/04 13:08:02 fault injection: enabled 2020/06/04 13:08:02 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/06/04 13:08:02 net packet injection: enabled 2020/06/04 13:08:02 net device setup: enabled 2020/06/04 13:08:02 concurrency sanitizer: enabled 2020/06/04 13:08:02 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/06/04 13:08:02 USB emulation: enabled 2020/06/04 13:08:03 adding functions to KCSAN blacklist: 'do_nanosleep' 'page_counter_charge' '__send_signal' syzkaller login: [ 54.378479][ T8919] ================================================================== [ 54.386947][ T8919] BUG: KCSAN: data-race in ep_poll / ep_poll_callback [ 54.393712][ T8919] [ 54.396302][ T8919] write to 0xffff888126a497d0 of 8 bytes by interrupt on cpu 1: [ 54.404017][ T8919] ep_poll_callback+0x5f2/0x6c0 [ 54.408878][ T8919] __wake_up_common+0x76/0x180 [ 54.413634][ T8919] __wake_up_common_lock+0x77/0xb0 [ 54.418945][ T8919] sock_def_readable+0x9d/0x130 [ 54.423818][ T8919] tcp_data_ready+0x76/0xc0 [ 54.428417][ T8919] tcp_rcv_established+0xcb8/0xee0 [ 54.433524][ T8919] tcp_v4_do_rcv+0x396/0x4f0 [ 54.438375][ T8919] tcp_v4_rcv+0x1c55/0x1e10 [ 54.442855][ T8919] ip_protocol_deliver_rcu+0x4b/0x410 [ 54.448273][ T8919] ip_local_deliver_finish+0xf3/0x120 [ 54.453657][ T8919] ip_local_deliver+0x135/0x220 [ 54.458518][ T8919] ip_sublist_rcv_finish+0xf0/0x140 [ 54.463779][ T8919] ip_sublist_rcv+0x3f8/0x530 [ 54.468460][ T8919] ip_list_rcv+0x2f3/0x321 [ 54.472981][ T8919] __netif_receive_skb_list_core+0x368/0x5c0 [ 54.480388][ T8919] netif_receive_skb_list_internal+0x5c7/0x810 [ 54.487185][ T8919] gro_normal_list.part.0+0x37/0xa0 [ 54.492918][ T8919] gro_normal_one+0x14c/0x160 [ 54.497599][ T8919] napi_gro_receive+0x27d/0x2f0 [ 54.502495][ T8919] receive_buf+0x24c/0x3420 [ 54.506996][ T8919] virtnet_poll+0x343/0x790 [ 54.512521][ T8919] net_rx_action+0x3ad/0xac0 [ 54.517540][ T8919] __do_softirq+0x118/0x34a [ 54.522203][ T8919] run_ksoftirqd+0x41/0x60 [ 54.526650][ T8919] smpboot_thread_fn+0x374/0x4a0 [ 54.531825][ T8919] kthread+0x203/0x230 [ 54.536552][ T8919] ret_from_fork+0x1f/0x30 [ 54.541199][ T8919] [ 54.543788][ T8919] read to 0xffff888126a497d0 of 8 bytes by task 8919 on cpu 0: [ 54.551516][ T8919] ep_poll+0x473/0x910 [ 54.555667][ T8919] do_epoll_wait+0x15a/0x180 [ 54.560242][ T8919] __x64_sys_epoll_pwait+0xc6/0x170 [ 54.565523][ T8919] do_syscall_64+0xc7/0x3b0 [ 54.570043][ T8919] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.576113][ T8919] [ 54.578484][ T8919] Reported by Kernel Concurrency Sanitizer on: [ 54.584998][ T8919] CPU: 0 PID: 8919 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.593470][ T8919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.605088][ T8919] ================================================================== [ 54.613355][ T8919] Kernel panic - not syncing: panic_on_warn set ... [ 54.620111][ T8919] CPU: 0 PID: 8919 Comm: syz-fuzzer Not tainted 5.7.0-rc1-syzkaller #0 [ 54.628802][ T8919] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 54.638946][ T8919] Call Trace: [ 54.642245][ T8919] dump_stack+0x11d/0x187 [ 54.646663][ T8919] panic+0x210/0x640 [ 54.650740][ T8919] ? vprintk_func+0x89/0x13a [ 54.656114][ T8919] kcsan_report.cold+0xc/0x1a [ 54.662299][ T8919] kcsan_setup_watchpoint+0x3fb/0x440 [ 54.667762][ T8919] ep_poll+0x473/0x910 [ 54.671852][ T8919] ? __fget_light+0xc0/0x1a0 [ 54.676676][ T8919] do_epoll_wait+0x15a/0x180 [ 54.682151][ T8919] __x64_sys_epoll_pwait+0xc6/0x170 [ 54.687442][ T8919] do_syscall_64+0xc7/0x3b0 [ 54.692230][ T8919] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 54.698385][ T8919] RIP: 0033:0x469240 [ 54.702449][ T8919] 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 [ 54.722225][ T8919] RSP: 002b:000000c00025d7f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 54.730625][ T8919] RAX: ffffffffffffffda RBX: 0000000000000350 RCX: 0000000000469240 [ 54.738595][ T8919] RDX: 0000000000000080 RSI: 000000c00025d840 RDI: 0000000000000003 [ 54.746640][ T8919] RBP: 000000c00025de40 R08: 0000000000000000 R09: 0000000000000000 [ 54.755379][ T8919] R10: 0000000000000350 R11: 0000000000000246 R12: 0000000000000003 [ 54.763870][ T8919] R13: 000000c0000ad200 R14: 0000000000000004 R15: 0000000000000004 [ 54.773826][ T8919] Kernel Offset: disabled [ 54.778276][ T8919] Rebooting in 86400 seconds..