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Re: thread_db_get_info: cannot get thread info: generic error on fork()/execvp()
- From: Daniel Jacobowitz <drow at false dot org>
- To: Alex Bligh <alex at alex dot org dot uk>
- Cc: gdb at sourceware dot org
- Date: Wed, 30 Aug 2006 14:14:39 -0400
- Subject: Re: thread_db_get_info: cannot get thread info: generic error on fork()/execvp()
- References: <20060726214801.14303.qmail@sourceware.org> <20060718124206.30754.qmail@sourceware.org> <20060731130001.GA1823@nevyn.them.org> <44DF8D67.8090502@alex.org.uk> <44F5BCAB.7050400@alex.org.uk>
On Wed, Aug 30, 2006 at 05:28:27PM +0100, Alex Bligh wrote:
> Hi,
>
> Now we have a pretty trivial test case to reproduce this problem,
> as per the 20 line program at the bottom of bug 2149,
> is there any chance at all of getting a fix? I currently
> can't debug my app at all because it suffers from this
> problem. I am willing to help in any way I can to debug
> this or test.
Well, I can reproduce the problem. I can see roughly what's wrong,
too. We still think we're attached to the old thread.
Could you try this patch?
--
Daniel Jacobowitz
CodeSourcery
2006-08-30 Daniel Jacobowitz <dan@codesourcery.com>
* infrun.c (handle_inferior_event): Context switch after fork
and exec events.
Index: infrun.c
===================================================================
RCS file: /cvs/src/src/gdb/infrun.c,v
retrieving revision 1.214
diff -u -p -r1.214 infrun.c
--- infrun.c 19 Aug 2006 03:19:00 -0000 1.214
+++ infrun.c 30 Aug 2006 18:13:51 -0000
@@ -1411,6 +1411,12 @@ handle_inferior_event (struct execution_
pending_follow.fork_event.parent_pid = PIDGET (ecs->ptid);
pending_follow.fork_event.child_pid = ecs->ws.value.related_pid;
+ if (!ptid_equal (ecs->ptid, inferior_ptid))
+ {
+ context_switch (ecs);
+ flush_cached_frames ();
+ }
+
stop_pc = read_pc ();
stop_bpstat = bpstat_stop_status (stop_pc, ecs->ptid, 0);
@@ -1469,6 +1475,12 @@ handle_inferior_event (struct execution_
ecs->random_signal = !bpstat_explains_signal (stop_bpstat);
inferior_ptid = ecs->saved_inferior_ptid;
+ if (!ptid_equal (ecs->ptid, inferior_ptid))
+ {
+ context_switch (ecs);
+ flush_cached_frames ();
+ }
+
/* If no catchpoint triggered for this, then keep going. */
if (ecs->random_signal)
{