[Bug cli/12929] Incorrect behavior with async mode

["pmuldoon at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=12929

Phil Muldoon <pmuldoon at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pmuldoon at redhat dot com
          Component|python                      |cli

--- Comment #1 from Phil Muldoon <pmuldoon at redhat dot com> 2011-07-11 14:26:42 UTC ---
It's not a Python issue. The issue is "attach" is not finishing in asynchronous
mode before "where" is executed.  If you do the below with asynchronous mode
"off" (the default) it works.  First the non-Python failing case.

[user@localhost gdb]$ sleep &
[2] 12216

[user@localhost gdb]$ gdb

GNU gdb (GDB) Fedora (7.2.90.20110525-39.fc15)
Copyright (C) 2011 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-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Setting up the environment for debugging gdb.

(gdb) set target-async on

(gdb) define at
>attach 11790
>where
>end

(gdb) at
#0  0x378ab660 in ?? ()
Backtrace stopped: Not enough registers or memory available to unwind further
During symbol reading, corrupt probe when reading
`/usr/lib/debug/lib64/libc-2.14.so.debug'.
0x00000030378ab660 in __nanosleep_nocancel () at
../sysdeps/unix/syscall-template.S:82
82    T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
Current language:  auto
The current source language is "auto; currently asm".

With target-async off:


[pmuldoon@localhost gdb]$ gdb

GNU gdb (GDB) Fedora (7.2.90.20110525-39.fc15)
Copyright (C) 2011 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-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>.
Setting up the environment for debugging gdb.

(gdb) define at
>attach 11790
>where
>end

(gdb) at
During symbol reading, corrupt probe when reading
`/usr/lib/debug/lib64/libc-2.14.so.debug'.
0x00000030378ab660 in __nanosleep_nocancel () at
../sysdeps/unix/syscall-template.S:82
82    T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
#0  0x00000030378ab660 in __nanosleep_nocancel () at
../sysdeps/unix/syscall-template.S:82
During symbol reading, incomplete CFI data; unspecified registers (e.g., rax)
at 0x30378ab66d.
#1  0x0000000000403c58 in rpl_nanosleep (requested_delay=0x7fff48c54b60,
remaining_delay=0x0) at nanosleep.c:93
#2  0x00000000004032c5 in xnanosleep (seconds=<optimized out>) at
xnanosleep.c:111
During symbol reading, cannot get low and high bounds for subprogram DIE at
859.
#3  0x0000000000401416 in main (argc=<optimized out>, argv=<optimized out>) at
sleep.c:147

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