[ 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 '10.128.0.213' (ECDSA) to the list of known hosts. 2020/07/30 22:13:49 fuzzer started 2020/07/30 22:13:49 dialing manager at 10.128.0.105:45459 2020/07/30 22:13:49 syscalls: 3254 2020/07/30 22:13:49 code coverage: enabled 2020/07/30 22:13:49 comparison tracing: enabled 2020/07/30 22:13:49 extra coverage: enabled 2020/07/30 22:13:49 setuid sandbox: enabled 2020/07/30 22:13:49 namespace sandbox: enabled 2020/07/30 22:13:49 Android sandbox: /sys/fs/selinux/policy does not exist 2020/07/30 22:13:49 fault injection: enabled 2020/07/30 22:13:49 leak checking: CONFIG_DEBUG_KMEMLEAK is not enabled 2020/07/30 22:13:49 net packet injection: enabled 2020/07/30 22:13:49 net device setup: enabled 2020/07/30 22:13:49 concurrency sanitizer: enabled 2020/07/30 22:13:49 devlink PCI setup: PCI device 0000:00:10.0 is not available 2020/07/30 22:13:49 USB emulation: enabled 2020/07/30 22:13:49 hci packet injection: enabled 2020/07/30 22:13:50 suppressing KCSAN reports in functions: 'do_signal_stop' 'blk_mq_dispatch_rq_list' 'n_tty_receive_buf_common' 'ext4_free_inode' '__xa_clear_mark' 'pcpu_alloc' 'ext4_mb_regular_allocator' 'do_nanosleep' '__ext4_new_inode' syzkaller login: [ 34.103353][ T8641] ================================================================== [ 34.111467][ T8641] BUG: KCSAN: data-race in do_epoll_wait / ep_poll_callback [ 34.118721][ T8641] [ 34.121026][ T8641] write to 0xffff88811fe8cc50 of 8 bytes by interrupt on cpu 0: [ 34.128628][ T8641] ep_poll_callback+0x29c/0x510 [ 34.133454][ T8641] __wake_up_common+0xbc/0x130 [ 34.139250][ T8641] __wake_up_sync_key+0x83/0xc0 [ 34.144090][ T8641] sock_def_readable+0x61/0xe0 [ 34.148825][ T8641] tcp_data_queue+0x1b71/0x3160 [ 34.153650][ T8641] tcp_rcv_established+0x667/0x1520 [ 34.158846][ T8641] tcp_v4_do_rcv+0x25e/0x480 [ 34.163412][ T8641] tcp_v4_rcv+0x219b/0x2420 [ 34.167888][ T8641] ip_protocol_deliver_rcu+0x1f9/0x400 [ 34.173318][ T8641] ip_local_deliver+0x1d6/0x2a0 [ 34.178140][ T8641] ip_sublist_rcv+0x4d4/0x5a0 [ 34.182790][ T8641] ip_list_rcv+0x262/0x290 [ 34.187178][ T8641] __netif_receive_skb_list_core+0x34b/0x450 [ 34.193132][ T8641] __netif_receive_skb_list+0x298/0x310 [ 34.198658][ T8641] netif_receive_skb_list_internal+0xda/0x330 [ 34.204696][ T8641] napi_gro_receive+0x329/0x5a0 [ 34.209544][ T8641] receive_buf+0x7a4/0xcf0 [ 34.213932][ T8641] virtnet_poll+0x2fa/0x780 [ 34.218431][ T8641] napi_poll+0x178/0x4a0 [ 34.222648][ T8641] net_rx_action+0x1ba/0x530 [ 34.227213][ T8641] __do_softirq+0x198/0x360 [ 34.231693][ T8641] asm_call_on_stack+0xf/0x20 [ 34.236361][ T8641] do_softirq_own_stack+0x5d/0x80 [ 34.241377][ T8641] do_softirq+0x86/0xb0 [ 34.245530][ T8641] __local_bh_enable_ip+0x63/0x70 [ 34.250533][ T8641] _raw_spin_unlock_bh+0x33/0x40 [ 34.255473][ T8641] release_sock+0x104/0x110 [ 34.259954][ T8641] tcp_recvmsg+0x16ba/0x1c10 [ 34.264517][ T8641] inet_recvmsg+0xa9/0x210 [ 34.268906][ T8641] sock_read_iter+0x19c/0x1e0 [ 34.273555][ T8641] vfs_read+0x523/0x590 [ 34.277686][ T8641] ksys_read+0xce/0x180 [ 34.281817][ T8641] __x64_sys_read+0x3e/0x50 [ 34.286291][ T8641] do_syscall_64+0x51/0xb0 [ 34.290681][ T8641] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.296541][ T8641] [ 34.298846][ T8641] read to 0xffff88811fe8cc50 of 8 bytes by task 8641 on cpu 1: [ 34.306382][ T8641] do_epoll_wait+0x2e2/0x870 [ 34.310945][ T8641] __x64_sys_epoll_pwait+0x92/0x150 [ 34.316114][ T8641] do_syscall_64+0x51/0xb0 [ 34.320504][ T8641] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.326381][ T8641] [ 34.328680][ T8641] Reported by Kernel Concurrency Sanitizer on: [ 34.334808][ T8641] CPU: 1 PID: 8641 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 34.343013][ T8641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.353062][ T8641] ================================================================== [ 34.361096][ T8641] Kernel panic - not syncing: panic_on_warn set ... [ 34.367656][ T8641] CPU: 1 PID: 8641 Comm: syz-fuzzer Not tainted 5.8.0-rc7-syzkaller #0 [ 34.375876][ T8641] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 34.385917][ T8641] Call Trace: [ 34.389182][ T8641] dump_stack+0x10f/0x19d [ 34.393506][ T8641] panic+0x207/0x64a [ 34.397376][ T8641] ? vprintk_emit+0x44a/0x4f0 [ 34.402027][ T8641] kcsan_report+0x684/0x690 [ 34.406504][ T8641] ? kcsan_setup_watchpoint+0x453/0x4d0 [ 34.412046][ T8641] ? do_epoll_wait+0x2e2/0x870 [ 34.416803][ T8641] ? __x64_sys_epoll_pwait+0x92/0x150 [ 34.422168][ T8641] ? do_syscall_64+0x51/0xb0 [ 34.426735][ T8641] ? entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.432784][ T8641] ? ep_send_events_proc+0x4fd/0x620 [ 34.438047][ T8641] kcsan_setup_watchpoint+0x453/0x4d0 [ 34.443412][ T8641] do_epoll_wait+0x2e2/0x870 [ 34.447978][ T8641] ? debug_smp_processor_id+0x18/0x20 [ 34.453323][ T8641] __x64_sys_epoll_pwait+0x92/0x150 [ 34.458493][ T8641] do_syscall_64+0x51/0xb0 [ 34.462884][ T8641] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [ 34.468766][ T8641] RIP: 0033:0x469240 [ 34.472639][ T8641] 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 [ 34.492214][ T8641] RSP: 002b:000000c0000497f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000119 [ 34.500614][ T8641] RAX: ffffffffffffffda RBX: 00000000000493b7 RCX: 0000000000469240 [ 34.508579][ T8641] RDX: 0000000000000080 RSI: 000000c000049840 RDI: 0000000000000003 [ 34.516548][ T8641] RBP: 000000c000049e40 R08: 0000000000000000 R09: 00007ffc8b504080 [ 34.524514][ T8641] R10: 00000000000493b7 R11: 0000000000000246 R12: 0000000000000003 [ 34.532809][ T8641] R13: 000000c000000f00 R14: 000000000000000f R15: 0000000000000261 [ 34.542018][ T8641] Kernel Offset: disabled [ 34.546356][ T8641] Rebooting in 86400 seconds..