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Avoid switch to invalid ptid during Ada task switch.

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This is to prevent an internal error during an Ada task switch. A task
switch is simply a thread switch under the hood. What we do is collect
the info from the Ada Task Control Block, deduce the associated thread
ptid, and then switch to that thread.  If the thread ptid computation
routine has not been implemented for the target, of if there is a bug,
then we end up computing a bogus ptid which GDB does not know about,
which eventually leads to an assertion failure:

    (gdb) task 1
    [New Thread 5715]
    /[...]/gdb/thread.c:595: internal-error: is_thread_state:
     Assertion `tp' failed.
    A problem internal to GDB has been detected,
    further debugging may prove unreliable.
    Quit this debugging session? (y or n)

When this happens, it's just nicer for the user to print an error
message, and cancel the task switch. After this patch is applied,
this is what we get:

    (gdb) task 1
    [New Thread 10250]
    Unable to compute thread ID for task 1.
    Cannot switch to this task.

gdb/ChangeLog:

        * ada-tasks.c (task_command_1): Check that the task ptid is valid
        before doing the associated thread switch.
This commit is contained in:
Joel Brobecker 2010-03-16 18:47:15 +00:00
parent d9097b0b39
commit b8d088acc8
2 changed files with 18 additions and 0 deletions
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5
gdb/ChangeLog
View File

@ -2,6 +2,11 @@
* linux-record.c (record_linux_msghdr): Remove unintended semicolons.
2010-03-16 Joel Brobecker <brobecker@adacore.com>
* ada-tasks.c (task_command_1): Check that the task ptid is valid
before doing the associated thread switch.
2010-03-16 Daniel Jacobowitz <dan@codesourcery.com>
* MAINTAINERS: Update my email address.

13
gdb/ada-tasks.c
View File

@ -877,6 +877,19 @@ task_command_1 (char *taskno_str, int from_tty)
to the thread list. */
target_find_new_threads ();
/* Verify that the ptid of the task we want to switch to is valid
(in other words, a ptid that GDB knows about). Otherwise, we will
cause an assertion failure later on, when we try to determine
the ptid associated thread_info data. We should normally never
encounter such an error, but the wrong ptid can actually easily be
computed if target_get_ada_task_ptid has not been implemented for
our target (yet). Rather than cause an assertion error in that case,
it's nicer for the user to just refuse to perform the task switch. */
if (!find_thread_ptid (task_info->ptid))
error (_("Unable to compute thread ID for task %d.\n"
"Cannot switch to this task."),
taskno);
switch_to_thread (task_info->ptid);
ada_find_printable_frame (get_selected_frame (NULL));
printf_filtered (_("[Switching to task %d]\n"), taskno);