[lldb-dev] Remote debugging ARM target from x86 host

Fri Aug 4 22:13:34 PDT 2017

Hi,

I am trying to remote debug ARM (linux) target from x86 (linux) host
and I am getting the following error while trying to launch a process.
The local debugging on ARM works.

error: connect remote failed (invalid host:port specification: '10.10.2.3')
error: process launch failed: invalid host:port specification: '10.10.2.3'

It appears the above error is because the gdb-remote is returning the
communication port as zero.

<  36> send packet: $qLaunchGDBServer;host:svrlin249;#bb
<  19> read packet: $pid:298;port:0;#bf

What are the possible reasons for the above behavior from gdb-remote
and how I could resolve this?

If it helps, below is the full log.

(lldb) log enable lldb comm
(lldb) log enable gdb-remote packets
(lldb) platform select remote-linux
  Platform: remote-linux
 Connected: no
(lldb) platform connect connect://10.10.2.3:500
0x915bd78 Communication::Communication (name = gdb-remote.client)
0x915bd78 Communication::Disconnect ()
0x915bd78 Communication::Disconnect ()
0x915bd78 Communication::Connect (url = connect://10.10.2.3:500)
Socket::TcpConnect (host/port = 10.10.2.3:500)
TCPSocket::Connect (host/port = 10.10.2.3:500)
0x915bd78 Communication::Write (src = 0xbfcb7433, src_len = 1)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0xbfcb7433, src_len = 1,
flags = 0) => 1 (error = (null))
<   1> send packet: +
this = 0x0915BD78, dst = 0xBFCB53EC, dst_len = 8192, timeout = 10000
us, connection = 0x0915F578
0x915bd78 Communication::Write (src = 0x916022c, src_len = 19)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x916022c, src_len = 19,
flags = 0) => 19 (error = (null))
history[1] tid=0x7cbf <   1> send packet: +
<  19> send packet: $QStartNoAckMode#b0
this = 0x0915BD78, dst = 0xBFCB51AC, dst_len = 8192, timeout = 6000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb51ac, src_len = 7,
flags = 0) => 7 (error = (null))
<   1> read packet: +
<   6> read packet: $OK#9a
0x915bd78 Communication::Write (src = 0xbfcb50f3, src_len = 1)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0xbfcb50f3, src_len = 1,
flags = 0) => 1 (error = (null))
<   1> send packet: +
0x915bd78 Communication::Write (src = 0x9161ff4, src_len = 13)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x9161ff4, src_len = 13,
flags = 0) => 13 (error = (null))
<  13> send packet: $qHostInfo#9b
this = 0x0915BD78, dst = 0xBFCB510C, dst_len = 8192, timeout = 1000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb510c, src_len = 316,
flags = 0) => 316 (error = (null))
< 316> read packet:
$triple:61726d2d2d6c696e75782d676e75656162696866;ptrsize:4;watchpoint_exceptions_received:before;endian:little;os_version:3.10.31;os_build:332e31302e33312d6c7473692d30323836312d6738303161343066;os_kernel:233520534d5020467269204d61792031332031353a35383a3232204953542032303136;hostname:736f
63667067615f617272696135;#0a
0x915bd78 Communication::Write (src = 0x915fe9c, src_len = 18)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x915fe9c, src_len = 18,
flags = 0) => 18 (error = (null))
<  18> send packet: $qGetWorkingDir#91
this = 0x0915BD78, dst = 0xBFCB50FC, dst_len = 8192, timeout = 1000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb50fc, src_len = 24,
flags = 0) => 24 (error = (null))
<  24> read packet: $2f686f6d652f726f6f74#4b
0x915bd78 Communication::Write (src = 0x915fe9c, src_len = 19)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x915fe9c, src_len = 19,
flags = 0) => 19 (error = (null))
<  19> send packet: $qQueryGDBServer#cb
this = 0x0915BD78, dst = 0xBFCB531C, dst_len = 8192, timeout = 1000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb531c, src_len = 7,
flags = 0) => 7 (error = (null))
<   7> read packet: $E04#a9
  Platform: remote-linux
    Triple: arm-*-linux-gnueabihf
OS Version: 3.10.31 (3.10.31-ltsi-02861-g801a40f)
    Kernel: #5 SMP Fri May 13 15:58:22 IST 2016
  Hostname: socfpga_arria5
 Connected: yes
WorkingDir: /home/root
(lldb) file main
0x915bd78 Communication::Write (src = 0x91638fc, src_len = 137)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x91638fc, src_len = 137,
flags = 0) => 137 (error = (null))
< 137> send packet:
$qModuleInfo:2f686f6d652f72616d616e616e2f776f726b5f726f6f742f546f545f6c6c64622f74657374732f6d61696e;61726d2d2d6c696e75782d656162696866#f1
this = 0x0915BD78, dst = 0xBFCB172C, dst_len = 8192, timeout = 1000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb172c, src_len = 7,
flags = 0) => 7 (error = (null))
<   7> read packet: $E03#a8
Current executable set to 'main' (arm).
(lldb) b main
Breakpoint 1: where = main`main + 4 at main.c:4, address = 0x000104a0
(lldb) run
0x915bd78 Communication::Write (src = 0x917bae4, src_len = 36)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x917bae4, src_len = 36,
flags = 0) => 36 (error = (null))
<  36> send packet: $qLaunchGDBServer;host:svrlin249;#bb
this = 0x0915BD78, dst = 0xBFCB4FDC, dst_len = 8192, timeout =
10000000 us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb4fdc, src_len = 19,
flags = 0) => 19 (error = (null))
<  19> read packet: $pid:298;port:0;#bf
0x92b0a84 Communication::Communication (name = process.stdio)
0x92b0d78 Communication::Communication (name = gdb-remote.client)
0x92b0a84 Communication::Disconnect ()
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
..................
..................
..................
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
Socket::TcpConnect (host/port = 10.10.2.3)
TCPSocket::Connect (host/port = 10.10.2.3)
error: connect remote failed (invalid host:port specification: '10.10.2.3')
0x915bd78 Communication::Write (src = 0x92b38c4, src_len = 27)
connection = 0x915f578
0x915f608 Socket::Write() (socket = 7, src = 0x92b38c4, src_len = 27,
flags = 0) => 27 (error = (null))
<  27> send packet: $qKillSpawnedProcess:298#8b
this = 0x0915BD78, dst = 0xBFCB509C, dst_len = 8192, timeout = 1000000
us, connection = 0x0915F578
0x915f608 Socket::Read() (socket = 7, src = 0xbfcb509c, src_len = 7,
flags = 0) => 7 (error = (null))
<   7> read packet: $E0a#d6
error: process launch failed: invalid host:port specification: '10.10.2.3'
(lldb)

Regards,
Ramana