WARNING: DATA RACE Read at 0x00c001cc5690 by goroutine 2115: DIAGNOSIS: I0305 10:25:57.627618 37899 main.go:305] *************************** I0305 10:25:57.627790 37899 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-1] I0305 10:25:57.628073 37899 main.go:307] Version release-20200219.0-72-gce4d1e45bb88 I0305 10:25:57.628151 37899 main.go:308] PID: 37899 I0305 10:25:57.628231 37899 main.go:309] UID: 0, GID: 0 I0305 10:25:57.628329 37899 main.go:310] Configuration: I0305 10:25:57.628419 37899 main.go:311] RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root I0305 10:25:57.628519 37899 main.go:312] Platform: ptrace I0305 10:25:57.628635 37899 main.go:313] FileAccess: shared, overlay: false I0305 10:25:57.628757 37899 main.go:314] Network: sandbox, logging: false I0305 10:25:57.628985 37899 main.go:315] Strace: false, max size: 1024, syscalls: [] I0305 10:25:57.629107 37899 main.go:316] *************************** W0305 10:25:57.629231 37899 main.go:321] Block the TERM signal. This is only safe in tests! D0305 10:25:57.629616 37899 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.636504 37899 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0 D0305 10:25:57.636726 37899 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.636864 37899 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.637431 37899 urpc.go:534] urpc: successfully marshalled 117 bytes. I0305 10:25:58.133674 37899 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 19108 I0305 10:25:58.133830 37899 debug.go:131] Retrieving sandbox stacks D0305 10:25:58.133952 37899 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:58.134114 37899 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" W0305 10:25:58.134282 37899 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 19108: connection refused retrieving stacks: connecting to control server at PID 19108: connection refused W0305 10:25:58.134649 37899 main.go:338] Failure to execute command, err: 1 Error collecting stacks: failed to run ["/syzkaller/managers/ptrace-proxy-sandbox-race/current/image" "-root" "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "-watchdog-action=panic" "-network=none" "-debug" "-alsologtostderr" "-platform=ptrace" "-file-access=shared" "-network=sandbox" "-TESTONLY-unsafe-nonroot" "debug" "-stacks" "--ps" "ci-gvisor-ptrace-proxy-sandbox-race-1"]: exit status 128 I0305 10:25:57.627618 37899 main.go:305] *************************** I0305 10:25:57.627790 37899 main.go:306] Args: [/syzkaller/managers/ptrace-proxy-sandbox-race/current/image -root /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root -watchdog-action=panic -network=none -debug -alsologtostderr -platform=ptrace -file-access=shared -network=sandbox -TESTONLY-unsafe-nonroot debug -stacks --ps ci-gvisor-ptrace-proxy-sandbox-race-1] I0305 10:25:57.628073 37899 main.go:307] Version release-20200219.0-72-gce4d1e45bb88 I0305 10:25:57.628151 37899 main.go:308] PID: 37899 I0305 10:25:57.628231 37899 main.go:309] UID: 0, GID: 0 I0305 10:25:57.628329 37899 main.go:310] Configuration: I0305 10:25:57.628419 37899 main.go:311] RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root I0305 10:25:57.628519 37899 main.go:312] Platform: ptrace I0305 10:25:57.628635 37899 main.go:313] FileAccess: shared, overlay: false I0305 10:25:57.628757 37899 main.go:314] Network: sandbox, logging: false I0305 10:25:57.628985 37899 main.go:315] Strace: false, max size: 1024, syscalls: [] I0305 10:25:57.629107 37899 main.go:316] *************************** W0305 10:25:57.629231 37899 main.go:321] Block the TERM signal. This is only safe in tests! D0305 10:25:57.629616 37899 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.636504 37899 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-1": signal 0 D0305 10:25:57.636726 37899 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.636864 37899 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:57.637431 37899 urpc.go:534] urpc: successfully marshalled 117 bytes. I0305 10:25:58.133674 37899 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1", PID: 19108 I0305 10:25:58.133830 37899 debug.go:131] Retrieving sandbox stacks D0305 10:25:58.133952 37899 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" D0305 10:25:58.134114 37899 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-1" W0305 10:25:58.134282 37899 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 19108: connection refused retrieving stacks: connecting to control server at PID 19108: connection refused W0305 10:25:58.134649 37899 main.go:338] Failure to execute command, err: 1 gvisor.dev/gvisor/pkg/tcpip/stack.(*TransportEndpointInfo).AddrNetProto() pkg/tcpip/stack/stack.go:573 +0x79 gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).checkV4Mapped() pkg/tcpip/transport/udp/endpoint.go:931 +0xee gvisor.dev/gvisor/pkg/tcpip/transport/udp.(*endpoint).Connect() pkg/tcpip/transport/udp/endpoint.go:984 +0x6c gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).Connect() pkg/sentry/socket/netstack/netstack.go:698 +0x4c5 gvisor.dev/gvisor/pkg/sentry/syscalls/linux.Connect() pkg/sentry/syscalls/linux/sys_socket.go:280 +0x251 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).executeSyscall() pkg/sentry/kernel/task_syscall.go:170 +0x44d gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallInvoke() pkg/sentry/kernel/task_syscall.go:291 +0xb4 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscallEnter() pkg/sentry/kernel/task_syscall.go:252 +0x109 gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).doSyscall() pkg/sentry/kernel/task_syscall.go:227 +0x1b3 gvisor.dev/gvisor/pkg/sentry/kernel.(*runApp).execute() pkg/sentry/kernel/task_run.go:232 +0x1aaa gvisor.dev/gvisor/pkg/sentry/kernel.(*Task).run() pkg/sentry/kernel/task_run.go:92 +0x320