[lldb-dev] [Bug 23344] New: lldb (local debugging) hangs with no output if lldb-server exits during launch

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23344

            Bug ID: 23344
           Summary: lldb (local debugging) hangs with no output if
                    lldb-server exits during launch
           Product: lldb
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: All Bugs
          Assignee: lldb-dev at cs.uiuc.edu
          Reporter: vince at nethacker.com
    Classification: Unclassified

lldb waits forever for the lldb-server to reverse connect.

repro steps: hack lldb-server to return at start of main

OBSERVED (threads in lldb)

python [40725] [cores: 12,31]  
  Thread #1 [python] 40725 (Exiting) [core: 12] (Suspended : User Request)  
    pthread_join() at pthread_join.c:92 0x7fa90d93c66b  
    lldb_private::HostThreadPosix::Join() at 0x7fa908b1439c  
    lldb_private::HostThread::Join() at 0x7fa907c123cd  
   
lldb_private::process_gdb_remote::GDBRemoteCommunication::JoinListenThread() at
0x7fa907d80d46  
   
lldb_private::process_gdb_remote::GDBRemoteCommunication::StartDebugserverProcess()
at 0x7fa907d8296d  
   
lldb_private::process_gdb_remote::ProcessGDBRemote::LaunchAndConnectToDebugserver()
at 0x7fa907dabc40  
    lldb_private::process_gdb_remote::ProcessGDBRemote::DoLaunch() at
0x7fa907daf71b  
    lldb_private::Process::Launch() at 0x7fa907ebdfd2  
    lldb_private::platform_linux::PlatformLinux::DebugProcess() at
0x7fa908ab16ef  
    lldb_private::Target::Launch() at 0x7fa907ee1550  
    <...more frames...>  
  Thread #2 [1:0] 40781 [core: 31] (Suspended : Container)  
    accept4() at accept4.c:37 0x7fa90d669b1f  
    lldb_private::Socket::BlockingAccept() at 0x7fa907c1a2df  
    lldb_private::ConnectionFileDescriptor::SocketListenAndAccept() at
0x7fa908b12ab6  
    lldb_private::ConnectionFileDescriptor::Connect() at 0x7fa908b13007  
    lldb_private::process_gdb_remote::GDBRemoteCommunication::ListenThread() at
0x7fa907d80010  
    lldb_private::HostNativeThreadBase::ThreadCreateTrampoline() at
0x7fa907c11f56  
    start_thread() at pthread_create.c:312 0x7fa90d93b182  
    clone() at clone.S:111 0x7fa90d66847d  

EXPECTED:

lldb outputs a nice error message

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