WARNING: DATA RACE
Write at 0x00c0004184f8 by goroutine 364:
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).fetchReadView()
pkg/sentry/socket/netstack/netstack.go:418 +0x85
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).nonBlockingRead()
pkg/sentry/socket/netstack/netstack.go:2388 +0x169
gvisor.dev/gvisor/pkg/sentry/socket/netstack.(*SocketOperations).RecvMsg()
pkg/sentry/socket/netstack/netstack.go:2535 +0x715
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.recvFrom()
pkg/sentry/syscalls/linux/sys_socket.go:871 +0x345
gvisor.dev/gvisor/pkg/sentry/syscalls/linux.RecvFrom()
pkg/sentry/syscalls/linux/sys_socket.go:896 +0x88
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
DIAGNOSIS:
I0302 01:26:54.908932 50392 main.go:305] ***************************
I0302 01:26:54.909137 50392 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-0]
I0302 01:26:54.909356 50392 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0302 01:26:54.909444 50392 main.go:308] PID: 50392
I0302 01:26:54.909562 50392 main.go:309] UID: 0, GID: 0
I0302 01:26:54.909629 50392 main.go:310] Configuration:
I0302 01:26:54.909713 50392 main.go:311] RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0302 01:26:54.909833 50392 main.go:312] Platform: ptrace
I0302 01:26:54.909937 50392 main.go:313] FileAccess: shared, overlay: false
I0302 01:26:54.910025 50392 main.go:314] Network: sandbox, logging: false
I0302 01:26:54.910132 50392 main.go:315] Strace: false, max size: 1024, syscalls: []
I0302 01:26:54.910226 50392 main.go:316] ***************************
W0302 01:26:54.910303 50392 main.go:321] Block the TERM signal. This is only safe in tests!
D0302 01:26:54.910472 50392 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.917348 50392 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0302 01:26:54.917576 50392 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.917692 50392 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.918202 50392 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0302 01:26:54.995982 50392 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 47680
I0302 01:26:54.996149 50392 debug.go:131] Retrieving sandbox stacks
D0302 01:26:54.996251 50392 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.996345 50392 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0302 01:26:54.996523 50392 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 47680: connection refused
retrieving stacks: connecting to control server at PID 47680: connection refused
W0302 01:26:54.996867 50392 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-0"]: exit status 128
I0302 01:26:54.908932 50392 main.go:305] ***************************
I0302 01:26:54.909137 50392 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-0]
I0302 01:26:54.909356 50392 main.go:307] Version release-20200219.0-72-gce4d1e45bb88
I0302 01:26:54.909444 50392 main.go:308] PID: 50392
I0302 01:26:54.909562 50392 main.go:309] UID: 0, GID: 0
I0302 01:26:54.909629 50392 main.go:310] Configuration:
I0302 01:26:54.909713 50392 main.go:311] RootDir: /syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root
I0302 01:26:54.909833 50392 main.go:312] Platform: ptrace
I0302 01:26:54.909937 50392 main.go:313] FileAccess: shared, overlay: false
I0302 01:26:54.910025 50392 main.go:314] Network: sandbox, logging: false
I0302 01:26:54.910132 50392 main.go:315] Strace: false, max size: 1024, syscalls: []
I0302 01:26:54.910226 50392 main.go:316] ***************************
W0302 01:26:54.910303 50392 main.go:321] Block the TERM signal. This is only safe in tests!
D0302 01:26:54.910472 50392 container.go:159] Load container "/syzkaller/managers/ptrace-proxy-sandbox-race/workdir/gvisor_root" "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.917348 50392 container.go:592] Signal container "ci-gvisor-ptrace-proxy-sandbox-race-0": signal 0
D0302 01:26:54.917576 50392 sandbox.go:806] Signal sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.917692 50392 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.918202 50392 urpc.go:534] urpc: successfully marshalled 117 bytes.
I0302 01:26:54.995982 50392 debug.go:122] Found sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0", PID: 47680
I0302 01:26:54.996149 50392 debug.go:131] Retrieving sandbox stacks
D0302 01:26:54.996251 50392 sandbox.go:924] Stacks sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
D0302 01:26:54.996345 50392 sandbox.go:318] Connecting to sandbox "ci-gvisor-ptrace-proxy-sandbox-race-0"
W0302 01:26:54.996523 50392 error.go:48] FATAL ERROR: retrieving stacks: connecting to control server at PID 47680: connection refused
retrieving stacks: connecting to control server at PID 47680: connection refused
W0302 01:26:54.996867 50392 main.go:338] Failure to execute command, err: 1
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