gdb refuses to connect to localhost

Simon Marchi simon.marchi@polymtl.ca
Sat Dec 26 00:00:41 GMT 2020



On 2020-12-25 6:45 p.m., Reinaldo Molina wrote:
> Thanks for the quick reply. 
> 
> Trying your suggestion: 
> 
> Terminal 1:
> 
>     gdbserver 127.0.01:8889 build/luajit --remote-debug
> 
> Terminal 2:
> 
>     > gdb build/luajit
>     GNU gdb (GDB) 10.1
>     Copyright (C) 2020 Free Software Foundation, Inc.
>     License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
>     This is free software: you are free to change and redistribute it.
>     There is NO WARRANTY, to the extent permitted by law.
>     Type "show copying" and "show warranty" for details.
>     This GDB was configured as "x86_64-pc-linux-gnu".
>     Type "show configuration" for configuration details.
>     For bug reporting instructions, please see:
>     <https://www.gnu.org/software/gdb/bugs/>.
>     Find the GDB manual and other documentation resources online at:
>         <http://www.gnu.org/software/gdb/documentation/>.
> 
>     For help, type "help".
>     Type "apropos word" to search for commands related to "word"...
>     Reading symbols from build/luajit...
>     (gdb) set debug remote 1
>     (gdb) target remote localhost:8889
>     Remote debugging using localhost:8889
>     Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Timed out.
>     Timed out.
>     Timed out.
>     Ignoring packet error, continuing...
>     Packet qSupported (supported-packets) is supported
>     warning: unrecognized item "timeout" in "qSupported" response
>     Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Timed out.
>     Timed out.
>     Timed out.
>     Ignoring packet error, continuing...
>     Remote replied unexpectedly to 'vMustReplyEmpty': timeout
>     (gdb) target remote 0.0.0.0:8889
>     Remote debugging using 0.0.0.0:8889
>     Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Sending packet: $qSupported:multiprocess+;swbreak+;hwbreak+;qRelocInsn+;fork-events+;vfork-events+;exec-events+;vContSupported+;QThreadEvents+;no-resumed+;xmlRegisters=i386#6a...Timed out.
>     Timed out.
>     Timed out.
>     Ignoring packet error, continuing...
>     Packet qSupported (supported-packets) is supported
>     warning: unrecognized item "timeout" in "qSupported" response
>     Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Sending packet: $vMustReplyEmpty#3a...Timed out.
>     Timed out.
>     Timed out.
>     Ignoring packet error, continuing...
>     Remote replied unexpectedly to 'vMustReplyEmpty': timeout
>     (gdb) target remote 127.0.0.1:8889
>     127.0.0.1:8889: Connection timed out.

Ok, I don't really know.  I'd probably try to strace gdbserver to see
if it at least accepts the incoming connection, and if so what happens
after that.

Simon


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