[ 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 '10.128.1.33' (ECDSA) to the list of known hosts. 2020/07/22 18:55:14 fuzzer started 2020/07/22 18:55:14 dialing manager at 10.128.0.105:32803 2020/07/22 18:55:15 syscalls: 3214 2020/07/22 18:55:15 code coverage: enabled 2020/07/22 18:55:15 comparison tracing: enabled 2020/07/22 18:55:15 extra coverage: enabled 2020/07/22 18:55:15 setuid sandbox: enabled 2020/07/22 18:55:15 namespace sandbox: enabled 2020/07/22 18:55:15 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/22 18:55:15 fault injection: enabled 2020/07/22 18:55:15 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/22 18:55:15 net packet injection: enabled 2020/07/22 18:55:15 net device setup: enabled 2020/07/22 18:55:15 concurrency sanitizer: enabled 2020/07/22 18:55:15 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/22 18:55:15 USB emulation: enabled 2020/07/22 18:55:15 suppressing KCSAN reports in functions: 'do_sys_poll' '__ext4_new_inode' 'blk_mq_rq_ctx_init' 'do_signal_stop' '__xa_clear_mark' 'snd_rawmidi_poll' syzkaller login: [ 34.148157][ T8657] ================================================================== [ 34.156261][ T8657] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 34.163526][ T8657] [ 34.165845][ T8657] write to 0xffff888128944950 of 8 bytes by interrupt on cpu 0: [ 34.173462][ T8657] ep_poll_callback+0x29c/0x510 [ 34.178320][ T8657] __wake_up_common+0xbc/0x130 [ 34.183065][ T8657] __wake_up_sync_key+0x83/0xc0 [ 34.187883][ T8657] sock_def_readable+0x61/0xe0 [ 34.192620][ T8657] tcp_rcv_established+0x13c0/0x1520 [ 34.197873][ T8657] tcp_v4_do_rcv+0x25e/0x480 [ 34.202432][ T8657] tcp_v4_rcv+0x219b/0x2420 [ 34.206904][ T8657] ip_protocol_deliver_rcu+0x1f9/0x400 [ 34.212340][ T8657] ip_local_deliver+0x1d6/0x2a0 [ 34.217159][ T8657] ip_sublist_rcv+0x4d4/0x5a0 [ 34.221806][ T8657] ip_list_rcv+0x262/0x290 [ 34.226206][ T8657] __netif_receive_skb_list_core+0x34b/0x450 [ 34.232153][ T8657] __netif_receive_skb_list+0x298/0x310 [ 34.238103][ T8657] netif_receive_skb_list_internal+0xda/0x330 [ 34.244139][ T8657] napi_gro_receive+0x329/0x5a0 [ 34.248985][ T8657] receive_buf+0x7a4/0xcf0 [ 34.253395][ T8657] virtnet_poll+0x2fa/0x780 [ 34.257906][ T8657] napi_poll+0x178/0x4a0 [ 34.262122][ T8657] net_rx_action+0x1ba/0x530 [ 34.266680][ T8657] __do_softirq+0x198/0x360 [ 34.271156][ T8657] run_ksoftirqd+0x2f/0x60 [ 34.275549][ T8657] smpboot_thread_fn+0x347/0x530 [ 34.280453][ T8657] kthread+0x20d/0x230 [ 34.284491][ T8657] ret_from_fork+0x1f/0x30 [ 34.288883][ T8657] [ 34.291192][ T8657] read to 0xffff888128944950 of 8 bytes by task 8657 on cpu 1: [ 34.298713][ T8657] do_epoll_wait+0x2e2/0x870 [ 34.303303][ T8657] __x64_sys_epoll_pwait+0x92/0x150 [ 34.308469][ T8657] do_syscall_64+0x51/0xb0 [ 34.312855][ T8657] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.318720][ T8657] [ 34.321014][ T8657] Reported by Kernel Concurrency Sanitizer on: [ 34.327134][ T8657] CPU: 1 PID: 8657 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 34.335346][ T8657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.345784][ T8657] ================================================================== [ 34.353812][ T8657] Kernel panic - not syncing: panic_on_warn set ... [ 34.360378][ T8657] CPU: 1 PID: 8657 Comm: syz-fuzzer Not tainted 5.8.0-rc6-syzkaller #0 [ 34.368588][ T8657] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.378610][ T8657] Call Trace: [ 34.381882][ T8657] dump_stack+0x10f/0x19d [ 34.386178][ T8657] panic+0x207/0x64a [ 34.390055][ T8657] ? vprintk_emit+0x44a/0x4f0 [ 34.394702][ T8657] kcsan_report+0x684/0x690 [ 34.399181][ T8657] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 34.404696][ T8657] ? do_epoll_wait+0x2e2/0x870 [ 34.409425][ T8657] ? __x64_sys_epoll_pwait+0x92/0x150 [ 34.414782][ T8657] ? do_syscall_64+0x51/0xb0 [ 34.419448][ T8657] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.425496][ T8657] ? ep_send_events_proc+0x4fd/0x620 [ 34.430756][ T8657] kcsan_setup_watchpoint+0x453/0x4d0 [ 34.436105][ T8657] do_epoll_wait+0x2e2/0x870 [ 34.440676][ T8657] ? debug_smp_processor_id+0x18/0x20 [ 34.446012][ T8657] __x64_sys_epoll_pwait+0x92/0x150 [ 34.451179][ T8657] do_syscall_64+0x51/0xb0 [ 34.455580][ T8657] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.461446][ T8657] RIP: 0033:0x469240 [ 34.465302][ T8657] Code: Bad RIP value. [ 34.469335][ T8657] RSP: 002b:000000c0001497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 34.477712][ T8657] RAX: ffffffffffffffda RBX: 00000000000000c3 RCX: 0000000000469240 [ 34.485653][ T8657] RDX: 0000000000000080 RSI: 000000c000149840 RDI: 0000000000000003 [ 34.493593][ T8657] RBP: 000000c000149e40 R08: 0000000000000000 R09: 0000000000000000 [ 34.501535][ T8657] R10: 00000000000000c3 R11: 0000000000000246 R12: 0000000000000003 [ 34.509485][ T8657] R13: 000000c000001500 R14: 0000000000000002 R15: 0000000000000002 [ 34.518434][ T8657] Kernel Offset: disabled [ 34.522752][ T8657] Rebooting in 86400 seconds..