[Bug gdb/14766] New: vfork child exit with "set follow-fork-mode child" broken

[Bug gdb/14766] New: vfork child exit with "set follow-fork-mode child" broken

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

             Bug #: 14766
           Summary: vfork child exit with "set follow-fork-mode child"
                    broken
           Product: gdb
           Version: HEAD
            Status: NEW
          Severity: normal
          Priority: P2
         Component: gdb
        AssignedTo: unassigned@sourceware.org
        ReportedBy: palves@redhat.com
    Classification: Unclassified


#include <stdio.h>
#include <unistd.h>

int
main ()
{
  int pid;

  pid = vfork ();
  if (pid == 0)
    {
      printf ("I'm the child!\n");
      _exit (0);
    }
  else
    {
      printf ("I'm the proud parent of child #%d!\n", pid);
    }

  return 0;
}

$ ./gdb ./testsuite/gdb.base/foll-vfork-exit -ex "set follow-fork-mode child"
GNU gdb (GDB) 7.5.50.20121008-cvs
...
(gdb) r
Starting program:
/home/pedro/gdb/mygit/build/gdb/testsuite/gdb.base/foll-vfork-exit 
[New process 4673]
I'm the child!
I'm the proud parent of child #4673!
Couldn't get registers: No such process.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Couldn't get registers: No such process.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Couldn't get registers: No such process.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
(gdb)

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[Bug gdb/14766] vfork child exit with "set follow-fork-mode child" broken

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |ASSIGNED
         AssignedTo|unassigned at sourceware    |palves at redhat dot com
                   |dot org                     |

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[Bug gdb/14766] vfork child exit with "set follow-fork-mode child" broken

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

--- Comment #1 from Pedro Alves <palves at redhat dot com> 2012-10-25 15:19:37 UTC ---
GDB is trying to read the registers of the child that just exited.

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[Bug gdb/14766] vfork child exit with "set follow-fork-mode child" broken

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

--- Comment #2 from Pedro Alves <palves at redhat dot com> 2012-10-25 17:58:34 UTC ---
Test and fix at:

http://sourceware.org/ml/gdb-patches/2012-10/msg00504.html

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[Bug gdb/14766] vfork child exit with "set follow-fork-mode child" broken

[cvs-commit at gcc dot gnu.org]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

--- Comment #3 from cvs-commit at gcc dot gnu.org <cvs-commit at gcc dot gnu.org> 2012-11-02 18:13:49 UTC ---
CVSROOT:    /cvs/src
Module name:    src
Changes by:    palves@sourceware.org    2012-11-02 18:13:38

Modified files:
    gdb            : ChangeLog infrun.c 
    gdb/testsuite  : ChangeLog 
    gdb/testsuite/gdb.base: foll-vfork.exp 

Log message:
    gdb/
    2012-11-02  Pedro Alves  <palves@redhat.com>

    PR gdb/14766

    * infrun.c (handle_inferior_event)
    <TARGET_WAITKIND_EXITED/TARGET_WAITKIND_SIGNALLED>: Switch to
    null_ptid before handling a vfork child exec or exit.  Switch to
    the event ptid afterwards.

    gdb/testsuite/
    2012-11-02  Pedro Alves  <palves@redhat.com>

    PR gdb/14766

    * gdb.base/foll-vfork.exp (vfork_child_follow_to_exit): Remove
    setup_kfail.
    (tcatch_vfork_then_child_follow_exit): No longer expect "Couldn't
    get registers".

Patches:
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/ChangeLog.diff?cvsroot=src&r1=1.14776&r2=1.14777
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/infrun.c.diff?cvsroot=src&r1=1.562&r2=1.563
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/ChangeLog.diff?cvsroot=src&r1=1.3436&r2=1.3437
http://sourceware.org/cgi-bin/cvsweb.cgi/src/gdb/testsuite/gdb.base/foll-vfork.exp.diff?cvsroot=src&r1=1.25&r2=1.26

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[Bug gdb/14766] vfork child exit with "set follow-fork-mode child" broken

[palves at redhat dot com]

http://sourceware.org/bugzilla/show_bug.cgi?id=14766

Pedro Alves <palves at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|                            |FIXED

--- Comment #4 from Pedro Alves <palves at redhat dot com> 2012-11-05 16:39:14 UTC ---
Patch checked in.

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