[Bug gdb/27580] New: gcore: stream libthread_db information

[Bug gdb/27580] New: gcore: stream libthread_db information

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

            Bug ID: 27580
           Summary: gcore: stream libthread_db information
           Product: gdb
           Version: HEAD
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: gdb
          Assignee: unassigned at sourceware dot org
          Reporter: mliska at suse dot cz
  Target Milestone: ---

I think gcore should stream also build-id and path:
/lib/libthread_db.so.1. I see the following error message when opening a core
file:

  warning: Unable to find libthread_db matching inferior's thread library,
thread debugging will not be available.

And gdb should be able to load the specified file when loading a core file.

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[Bug gdb/27580] gcore: stream libthread_db information

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           See Also|                            |https://sourceware.org/bugz
                   |                            |illa/show_bug.cgi?id=27570

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[Bug gdb/27580] gcore: stream libthread_db information

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |amerey at redhat dot com

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[Bug gdb/27580] gcore: stream libthread_db information

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

Martin Liska <mliska at suse dot cz> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
   Last reconfirmed|                            |2023-01-13

--- Comment #1 from Martin Liska <mliska at suse dot cz> ---
@Aaron: Is this something you're planning to take a look?

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[Bug gdb/27580] gcore: stream libthread_db information

[amerey at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

--- Comment #2 from Aaron Merey <amerey at redhat dot com> ---
(In reply to Martin Liska from comment #1)
> @Aaron: Is this something you're planning to take a look?

I'm not seeing the "unable to find libthread_db" warning when opening a core
file. Do you have a reproducer for this?

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[Bug gdb/27580] gcore: stream libthread_db information

[mliska at suse dot cz]

https://sourceware.org/bugzilla/show_bug.cgi?id=27580

--- Comment #3 from Martin Liska <mliska at suse dot cz> ---
The message will be displayed if you debug a core file from a machine that has
e.g. ancient version of glibc:

gdb/linux-thread-db.c:

/* Predicate which tests whether objfile OBJ refers to the library
   containing pthread related symbols.  Historically, this library has
   been named in such a way that looking for "libpthread" in the name
   was sufficient to identify it.  As of glibc-2.34, the C library
   (libc) contains the thread library symbols.  Therefore we check
   that the name matches a possible thread library, but we also check
   that it contains at least one of the symbols (pthread_create) that
   we'd expect to find in the thread library.  */

static bool
libpthread_objfile_p (objfile *obj)
{
  return (libpthread_name_p (objfile_name (obj))
          && lookup_minimal_symbol ("pthread_create",
                                    NULL,
                                    obj).minsym != NULL);
}

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