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[Bug gdb/11503] New: Cannot attach to lwp


Target - MIPS4k
OS - Linux 2.6.18
GDBServer - version 7.1
toolchain  uClibc-nptl-0.9.29-20070423
Host x86/Ubuntu
GDBversion 7.1

I have a multithreaded application. When GDB server connects to the host, 
following error messages are printed -== logs from gdbserver ==
Remote debugging from host 10.201.68.240

Cannot attach to lwp 716615888: No such process (3)
gdbserver: Could not attach 
to thread 715857920 (LWP 716615888)

Cannot attach to lwp 716615888: No such process (3)
gdbserver: Could not attach to thread 715857920 (LWP 716615888)

Cannot attach to lwp 716615888: No such process (3)
gdbserver: Could not attach to thread 715857920 (LWP 716615888)

Cannot attach to lwp 716615888: No such process (3)
gdbserver: Could not attach to thread 715857920 (LWP 716615888)

Cannot find new threads: debugger service failed


== logs from gdb host ==

Reading symbols from /user/kumar/pc.elf...done.
Remote debugging using 192.168.1.26:22 pc.elf
Sending packet: $qSupported#37...Ack
Packet received: 
PacketSize=3fff;QPassSignals+;qXfer:libraries:read+;qXfer:auxv:read+;qXfer:spu:r
ead+;qXfer:spu:write+;qXfer:siginfo:read+;qXfer:siginfo:write+;qXfer:features:re
ad+;QStartNoAckMode+;qXfer:osdata:read+;multiprocess+;QNonStop+;qXfer:threads:re
ad+
Packet qSupported (supported-packets) is supported
Sending packet: $QStartNoAckMode#b0...Ack
Packet received: OK
Sending packet: $Hg0#df...Packet received: OK
Sending packet: $qXfer:features:read:target.xml:0,fff#7d...Packet received: l<?
xml version="1.0"?>\n<!-- Copyright (C) 2007, 2008, 2009, 2010 Free Software 
Foundation, Inc.\n\n     Copying and distribution of this file, with or without 
modification,\n     are permitted in any medium without royalty provided the 
copyright\n     notice and this notice are preserved.  -->\n\n<!DOCTYPE target 
SYSTEM "gdb-target.dtd">\n<target>\n  <architecture>mips</architecture>\n  
<osabi>GNU/Linux</osabi>\n  <xi:include href="mips-cpu.xml"/>\n  <xi:include 
href="mips-cp0.xml"/>\n  <xi:include href="mips-fpu.xml"/>\n\n  <feature 
name="org.gnu.gdb.mips.linux">\n    <reg name="restart" bitsize="32" 
group="system"/>\n  </feature>\n</target>\n
Sending packet: $qXfer:features:read:mips-cpu.xml:0,fff#24...Packet received: 
l<?xml version="1.0"?>\n<!-- Copyright (C) 2007, 2008, 2009, 2010 Free Software 
Foundation, Inc.\n\n     Copying and distribution of this file, with or without 
modification,\n     are permitted in any medium without royalty provided the 
copyright\n     notice and this notice are preserved.  -->\n\n<!DOCTYPE feature 
SYSTEM "gdb-target.dtd">\n<feature name="org.gnu.gdb.mips.cpu">\n  <reg 
name="r0" bitsize="32" regnum="0"/>\n  <reg name="r1" bitsize="32"/>\n  <reg 
name="r2" bitsize="32"/>\n  <reg name="r3" bitsize="32"/>\n  <reg name="r4" 
bitsize="32"/>\n  <reg name="r5" bitsize="32"/>\n  <reg name="r6" 
bitsize="32"/>\n  <reg name="r7" bitsize="32"/>\n  <reg name="r8" 
bitsize="32"/>\n  <reg name="r9" bitsize="32"/>\n  <reg name="r10" 
bitsize="32"/>\n  <reg name="r11" bitsize="32"/>\n  <reg name="r12" 
bitsize="32"/>\n  <reg name="r13" bitsize="32"/>\n  <reg name="r14" 
bitsize="32"/>\n  <reg name="r15" bitsize="32"/>\n  <reg name="r16" 
bitsize="32"/>\n  <reg name="r17" bitsize="32"/>\n  <reg name="r18" 
bitsize="32"/>\n  <reg name="r19" bitsize="32"/>\n  <reg name="r20" 
bitsize="32"/>\n  <reg name="r21" bitsize="32"/>\n  <reg name="r22" 
bitsize="32"/>\n  <reg name="r23" bitsize="32"/>\n  <reg name="r24" 
bitsize="32"/>\n  <reg name="r25" bitsize="32"/>\n  <reg name="r26" 
bitsize="32"/>\n  <reg name="r27" bitsize="32"/>\n  <reg name="r28" 
bitsize="32"/>\n  <reg name="r29" bitsize="32"/>\n  <reg name="r30" 
bitsize="32"/>\n  <reg name="r31" bitsize="32"/>\n\n  <reg name="lo" 
bitsize="32" regnum="33"/>\n  <reg name="hi" bitsize="32" regnum="34"/>\n  <reg 
name="pc" bitsize="32" regnum="37"/>\n</feature>\n
Sending packet: $qXfer:features:read:mips-cp0.xml:0,fff#df...Packet received: 
l<?xml version="1.0"?>\n<!-- Copyright (C) 2007, 2008, 2009, 2010 Free Software 
Foundation, Inc.\n\n     Copying and distribution of this file, with or without 
modification,\n     are permitted in any medium without royalty provided the 
copyright\n     notice and this notice are preserved.  -->\n\n<!DOCTYPE feature 
SYSTEM "gdb-target.dtd">\n<feature name="org.gnu.gdb.mips.cp0">\n  <reg 
name="status" bitsize="32" regnum="32"/>\n  <reg name="badvaddr" bitsize="32" 
regnum="35"/>\n  <reg name="cause" bitsize="32" regnum="36"/>\n</feature>\n
Sending packet: $qXfer:features:read:mips-fpu.xml:0,fff#27...Packet received: 
l<?xml version="1.0"?>\n<!-- Copyright (C) 2007, 2008, 2009, 2010 Free Software 
Foundation, Inc.\n\n     Copying and distribution of this file, with or without 
modification,\n     are permitted in any medium without royalty provided the 
copyright\n     notice and this notice are preserved.  -->\n\n<!DOCTYPE feature 
SYSTEM "gdb-target.dtd">\n<feature name="org.gnu.gdb.mips.fpu">\n  <reg 
name="f0" bitsize="32" type="ieee_single" regnum="38"/>\n  <reg name="f1" 
bitsize="32" type="ieee_single"/>\n  <reg name="f2" bitsize="32" 
type="ieee_single"/>\n  <reg name="f3" bitsize="32" type="ieee_single"/>\n  <reg 
name="f4" bitsize="32" type="ieee_single"/>\n  <reg name="f5" bitsize="32" 
type="ieee_single"/>\n  <reg name="f6" bitsize="32" type="ieee_single"/>\n  <reg 
name="f7" bitsize="32" type="ieee_single"/>\n  <reg name="f8" bitsize="32" 
type="ieee_single"/>\n  <reg name="f9" bitsize="32" type="ieee_single"/>\n  <reg 
name="f10" bitsize="32" type="ieee_single"/>\n  <reg name="f11" bitsize="32" 
type="ieee_single"/>\n  <reg name="f12" bitsize="32" type="ieee_single"/>\n  
<reg name="f13" bitsize="32" type="ieee_single"/>\n  <reg name="f14" 
bitsize="32" type="ieee_single"/>\n  <reg name="f15" bitsize="32" 
type="ieee_single"/>\n  <reg name="f16" bitsize="32" type="ieee_single"/>\n  
<reg name="f17" bitsize="32" type="ieee_single"/>\n  <reg name="f18" 
bitsize="32" type="ieee_single"/>\n  <reg name="f19" bitsize="32" 
type="ieee_single"/>\n  <reg name="f20" bitsize="32" type="ieee_single"/>\n  
<reg name="f21" bitsize="32" type="ieee_single"/>\n  <reg name="f22" 
bitsize="32" type="ieee_single"/>\n  <reg name="f23" bitsize="32" 
type="ieee_single"/>\n  <reg name="f24" bitsize="32" type="ieee_single"/>\n  
<reg name="f25" bitsize="32" type="ieee_single"/>\n  <reg name="f26" 
bitsize="32" type="ieee_single"/>\n  <reg name="f27" bitsize="32" 
type="ieee_single"/>\n  <reg name="f28" bitsize="32" type="ieee_single"/>\n  
<reg name="f29" bitsize="32" type="ieee_single"/>\n  <reg name="f30" 
bitsize="32" type="ieee_single"/>\n  <reg name="f31" bitsize="32" 
type="ieee_single"/>\n\n  <reg name="fcsr" bitsize="32" group="float"/>\n  <reg 
name="fir" bitsize="32" group="float"/>\n</feature>\n
Sending packet: $QNonStop:0#8c...Packet received: OK
Sending packet: $?#3f...Packet received: 
T051d:404ea37f;25:40014000;thread:46;core:0;
Sending packet: $Hc-1#09...Packet received: E01
Sending packet: $qC#b4...Packet received: QC46
Sending packet: $qAttached#8f...Packet received: 0
Packet qAttached (query-attached) is supported
Sending packet: $qOffsets#4b...Packet received: 
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400034,20#26...Packet received: 
00000070d4000000d4004000d400400018000000180000000400000004000000
Sending packet: $m400054,20#28...Packet received: 
0100000000000000000040000000400090470500904705000500000000100000
Sending packet: $m400074,20#2a...Packet received: 
0100000090470500905745009057450070050000c07700000600000000100000
Sending packet: $m400094,20#2c...Packet received: 
07000000d4480500d4584500d4584500040000000c0000000400000004000000
Sending packet: $m4000b4,20#55...Packet received: 
51e5746400000000000000000000000000000000000000000700000004000000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400034,20#26...Packet received: 
00000070d4000000d4004000d400400018000000180000000400000004000000
Sending packet: $m400054,20#28...Packet received: 
0100000000000000000040000000400090470500904705000500000000100000
Sending packet: $m400074,20#2a...Packet received: 
0100000090470500905745009057450070050000c07700000600000000100000
Sending packet: $m400094,20#2c...Packet received: 
07000000d4480500d4584500d4584500040000000c0000000400000004000000
Sending packet: $m4000b4,20#55...Packet received: 
51e5746400000000000000000000000000000000000000000700000004000000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400034,20#26...Packet received: 
00000070d4000000d4004000d400400018000000180000000400000004000000
Sending packet: $m400054,20#28...Packet received: 
0100000000000000000040000000400090470500904705000500000000100000
Sending packet: $m400074,20#2a...Packet received: 
0100000090470500905745009057450070050000c07700000600000000100000
Sending packet: $m400094,20#2c...Packet received: 
07000000d4480500d4584500d4584500040000000c0000000400000004000000
Sending packet: $m4000b4,20#55...Packet received: 
51e5746400000000000000000000000000000000000000000700000004000000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400034,20#26...Packet received: 
00000070d4000000d4004000d400400018000000180000000400000004000000
Sending packet: $m400054,20#28...Packet received: 
0100000000000000000040000000400090470500904705000500000000100000
Sending packet: $m400074,20#2a...Packet received: 
0100000090470500905745009057450070050000c07700000600000000100000
Sending packet: $m400094,20#2c...Packet received: 
07000000d4480500d4584500d4584500040000000c0000000400000004000000
Sending packet: $m4000b4,20#55...Packet received: 
51e5746400000000000000000000000000000000000000000700000004000000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400034,20#26...Packet received: 
00000070d4000000d4004000d400400018000000180000000400000004000000
Sending packet: $m400054,20#28...Packet received: 
0100000000000000000040000000400090470500904705000500000000100000
Sending packet: $m400074,20#2a...Packet received: 
0100000090470500905745009057450070050000c07700000600000000100000
Sending packet: $m400094,20#2c...Packet received: 
07000000d4480500d4584500d4584500040000000c0000000400000004000000
Sending packet: $m4000b4,20#55...Packet received: 
51e5746400000000000000000000000000000000000000000700000004000000
Sending packet: $qXfer:auxv:read::0,1000#6b...Packet received: 
l\020\000\000\000\000\000\000\000\006\000\000\000\000\020\000\000\021\000\000\00
0d\000\000\000\003\000\000\0004\000@\000\004\000\000\000 
\000\000\000\005\000\000\000\005\000\000\000\a\000\000\000\000\000\000\000\b\000
\000\000\000\000\000\000\t\000\000\000@\001@\000\013\000\000\000\000\000\000\000
\f\000\000\000\000\000\000\000\r\000\000\000\000\000\000\000\016\000\000\000\000
\000\000\000\027\000\000\000\000\000\000\000\000\000\000\000\000\000\000\000
Sending packet: $m400140,4#f6...Packet received: 2100e003
Sending packet: $m40013c,4#28...Packet received: 00000000
Sending packet: $m400140,4#f6...Packet received: 2100e003
Sending packet: $m40013c,4#28...Packet received: 00000000
Sending packet: $m400140,4#f6...Packet received: 2100e003
0x00400140 in __start ()
Sending packet: $qSymbol::#5b...Packet received: 
qSymbol:6e70746c5f76657273696f6e
Packet qSymbol (symbol-lookup) is supported
Sending packet: $qSymbol:4145b0:6e70746c5f76657273696f6e#ad...Packet received: 
qSymbol:5f7468726561645f64625f636f6e73745f7468726561645f61726561
Sending packet: 
$qSymbol:41455c:5f7468726561645f64625f636f6e73745f7468726561645f61726561#ad...Pa
cket received: qSymbol:5f7468726561645f64625f73697a656f665f70746872656164
Sending packet: 
$qSymbol:4143fc:5f7468726561645f64625f73697a656f665f70746872656164#75...Packet 
received: qSymbol:5f7468726561645f64625f707468726561645f7370656369666963
Sending packet: 
$qSymbol:414454:5f7468726561645f64625f707468726561645f7370656369666963#8a...Pack
et received: 
qSymbol:5f7468726561645f64625f707468726561645f7363686564706f6c696379
Sending packet: 
$qSymbol:41443c:5f7468726561645f64625f707468726561645f7363686564706f6c696379#59.
..Packet received: 
qSymbol:5f7468726561645f64625f707468726561645f7363686564706172616d5f73636865645f
7072696f72697479
Sending packet: 
$qSymbol:414448:5f7468726561645f64625f707468726561645f7363686564706172616d5f7363
6865645f7072696f72697479#5d...Packet received: 
qSymbol:5f7468726561645f64625f707468726561645f746964
Sending packet: 
$qSymbol:414418:5f7468726561645f64625f707468726561645f746964#76...Packet 
received: 
qSymbol:5f7468726561645f64625f707468726561645f63616e63656c68616e646c696e67
Sending packet: 
$qSymbol:414430:5f7468726561645f64625f707468726561645f63616e63656c68616e646c696e
67#ee...Packet received: 
qSymbol:5f7468726561645f64625f707468726561645f7265706f72745f6576656e7473
Sending packet: 
$qSymbol:41440c:5f7468726561645f64625f707468726561645f7265706f72745f6576656e7473
#55...Packet received: 
qSymbol:5f7468726561645f64625f707468726561645f73746172745f726f7574696e65
Sending packet: 
$qSymbol:414424:5f7468726561645f64625f707468726561645f73746172745f726f7574696e65
#2b...Packet received: 
qSymbol:5f7468726561645f64625f707468726561645f6576656e746275665f6576656e746d6173
6b5f6576656e745f62697473
Sending packet: 
$qSymbol:414478:5f7468726561645f64625f707468726561645f6576656e746275665f6576656e
746d61736b5f6576656e745f62697473#d3...Packet received: 
qSymbol:5f5f737461636b5f75736572
Sending packet: $qSymbol:455dd0:5f5f737461636b5f75736572#a9...Packet received: 
qSymbol:5f7468726561645f64625f6c6973745f745f6e657874
Sending packet: 
$qSymbol:414494:5f7468726561645f64625f6c6973745f745f6e657874#14...Packet 
received: E01
== end of log ==

I can proceed with debugging. However, cannot use the commans set scheduler-lock  
on. Not sure if the logs and the problem are related.

-- 
           Summary: Cannot attach to lwp
           Product: gdb
           Version: 7.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned at sourceware dot org
        ReportedBy: sreekumar dot tp at gmail dot com
                CC: gdb-prs at sourceware dot org


http://sourceware.org/bugzilla/show_bug.cgi?id=11503

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