Re: [PATCH v3] Make only user-specified executable and symbol filenames sticky

[Gary Benson <gbenson at redhat dot com>]

Philippe Waroquiers wrote:
> On Mon, 2015-06-08 at 10:01 +0100, Gary Benson wrote:
> > This updated patch has been created against the latest gdb/master
> > (80fb91378c91a8239817a5ab2b1c3e346109db25).  Could you please try
> > your tests again?
> 
> First test with 'native' attach/detach/attach/detach/attach is
> working ok.
> However, the behaviour of the 3rd attach differs: a question
> is asked, that is answered automatically as yes (for EOF).
> So that is strange.
>         GNU gdb (GDB) 7.9.50.20150608-cvs
>         ...
>         Type "apropos word" to search for commands related to "word".
>         (gdb) atta 13286
>         Attaching to process 13286
>         Reading symbols from /bin/sleep...(no debugging symbols found)...done.
>         Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...(no debugging symbols found)...done.
>         Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
>         0x00007f3c5bb06f20 in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6
>         (gdb) detach
>         Detaching from program: /bin/sleep, process 13286
>         (gdb) atta 13320
>         Attaching to program: /bin/sleep, process 13320
>         Reading symbols from /home/philippe/valgrind/trunk_untouched/gdbserver_tests/sleepers...done.
>         Reading symbols from /lib/x86_64-linux-gnu/libpthread.so.0...(no debugging symbols found)...done.
>         [New LWP 13323]
>         [New LWP 13322]
>         [New LWP 13321]
>         [Thread debugging using libthread_db enabled]
>         Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
>         Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...(no debugging symbols found)...done.
>         Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
>         0x00007f5f538e1da3 in select () from /lib/x86_64-linux-gnu/libc.so.6
>         (gdb) detach
>         Detaching from program: /home/philippe/valgrind/trunk_untouched/gdbserver_tests/sleepers, process 13320
>         (gdb) atta 13286
>         Attaching to program: /home/philippe/valgrind/trunk_untouched/gdbserver_tests/sleepers, process 13286
>         Load new symbol table from "/bin/sleep"? (y or n) EOF [assumed Y]
>         Reading symbols from /bin/sleep...(no debugging symbols found)...done.
>         Reading symbols from /lib/x86_64-linux-gnu/libc.so.6...(no debugging symbols found)...done.
>         Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
>         0x00007f3c5bb06f20 in nanosleep () from /lib/x86_64-linux-gnu/libc.so.6
>         (gdb) 

I don't see the question:

  GNU gdb (GDB) 7.9.50.20150703-cvs
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  <http://www.gnu.org/software/gdb/documentation/>.
  For help, type "help".
  Type "apropos word" to search for commands related to "word".
  (gdb) atta 15450
  Attaching to process 15450
  Reading symbols from /bin/sleep...(no debugging symbols found)...done.
  Reading symbols from /lib64/libc.so.6...warning: the debug information found in "/usr/lib/debug//lib64/libc-2.12.so.debug" does not match "/lib64/libc.so.6" (CRC mismatch).
  (no debugging symbols found)...done.
  Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.12.so.debug...warning: Skipping deprecated .gdb_index section in /usr/lib/debug/lib64/ld-2.12.so.debug.
  Do "set use-deprecated-index-sections on" before the file is read
  to use the section anyway.
  done.
  done.
  0x00000039b54aca20 in __nanosleep_nocancel () from /lib64/libc.so.6
  (gdb) detach
  Detaching from program: /bin/sleep, process 15450
  (gdb) atta 15465
  Attaching to program: /bin/sleep, process 15465
  Reading symbols from /bin/sleep...(no debugging symbols found)...done.
  Reading symbols from /lib64/libc.so.6...warning: the debug information found in "/usr/lib/debug//lib64/libc-2.12.so.debug" does not match "/lib64/libc.so.6" (CRC mismatch).
  (no debugging symbols found)...done.
  Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.12.so.debug...done.
  done.
  0x00000039b54aca20 in __nanosleep_nocancel () from /lib64/libc.so.6
  (gdb) detach
  Detaching from program: /bin/sleep, process 15465
  (gdb) atta 15450
  Attaching to program: /bin/sleep, process 15450
  Reading symbols from /bin/sleep...(no debugging symbols found)...done.
  Reading symbols from /lib64/libc.so.6...warning: the debug information found in "/usr/lib/debug//lib64/libc-2.12.so.debug" does not match "/lib64/libc.so.6" (CRC mismatch).
  (no debugging symbols found)...done.
  Reading symbols from /lib64/ld-linux-x86-64.so.2...Reading symbols from /usr/lib/debug/lib64/ld-2.12.so.debug...done.
  done.
  0x00000039b54aca20 in __nanosleep_nocancel () from /lib64/libc.so.6
  (gdb) 

I did notice that if you do the second or third attach without a
detach GDB asks "A program is being debugged already.  Kill it?"
That's not what I'd expect (I'd expect GDB to offer to detach).
But that's a separate issue...

Joel, should I commit this patch?  FAOD it's
https://sourceware.org/ml/gdb-patches/2015-06/msg00110.html

Thanks,
Gary

-- 
http://gbenson.net/