From: Dov Grobgeld <dov.grobgeld@gmail.com>
To: Chong Yidong <cyd@gnu.org>
Cc: 10580@debbugs.gnu.org
Subject: bug#10580: 24.0.92; gdb initialization takes more than one minute at 100% CPU
Date: Mon, 7 May 2012 08:07:44 +0300 [thread overview]
Message-ID: <CA++fsGEQ9yyhBvsHzfeKZDpGYQ9g9r7w2cKZudmZtWcDv-Ma5Q@mail.gmail.com> (raw)
In-Reply-To: <874nrsem67.fsf@gnu.org>
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Hi Chong,
In response to your questions.
During the "100% CPU" time period, emacs still responds normally and files
can be opened, etc.
My gdb version is "GNU gdb (GDB) Fedora (7.2-52.fc14)". I have tried it at
home as well with a later version from Fedora 16 and the result is the same.
I put breakpoints at the lines that you indicated, but as you suspected,
the breakpoints are only reached when I exit gdb with the "quit" command.
What's next? Thanks again for looking into this.
Dov
On Mon, May 7, 2012 at 5:53 AM, Chong Yidong <cyd@gnu.org> wrote:
> Dov Grobgeld <dov.grobgeld@gmail.com> writes:
>
> > The *input/output of a.out* is empty.
> >
> > It seems that I was wrong about read_key_sequence(). It doesn't
> > "return early".
>
> During this time, is Emacs responsive to user commands, i.e. does it
> work normally apart from taking 100% CPU? Or is it just unresponsive?
>
> Also, what is your gdb version?
>
> Also, please set a breakpoint at process.c:4896, which should be the
> line
>
> struct Lisp_Process *p = XPROCESS (proc);
>
> as well as the function exec_sentinel(). See if Emacs hits each
> breakpoint, and step through it for the next several steps. In
> exec_sentinel, please show the Lisp values of the `proc' and `reason'
> variables (i.e. `pp proc' and `pp reason'.)
>
> Basically, gdb-mi.el allocates a pty and passes it to the gdb process,
> which hooks the pty up to the debugged process's input/output. That's
> what the "1-inferior-tty-set /dev/pts/9" gdb command does. Emacs then
> listens for input/output on the pty. Recently I fixed a bug in which
> Emacs would use 100% CPU due to Emacs getting an EIO error on that pty
> and then spinning; this fix involved setting up a sentinel that closes
> the pty when Emacs gets EIO; it's possible the fix is not working for
> you, though I don't know why. The other possibility is that the program
> you are debugging does something strange with its input/output stream.
>
> Thanks.
>
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next prev parent reply other threads:[~2012-05-07 5:07 UTC|newest]
Thread overview: 48+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-22 12:42 bug#10580: 24.0.92; gdb initialization takes more than one minute at 100% CPU Dov Grobgeld
2012-01-23 0:53 ` Glenn Morris
[not found] ` <CA++fsGG4YuTtb2VC9R+GRcPN5+JSaKpkb+uO3WAX0+VXmh8HDQ@mail.gmail.com>
2012-01-23 9:21 ` Glenn Morris
2012-01-25 0:37 ` Glenn Morris
2012-01-25 8:49 ` Dov Grobgeld
2012-01-25 9:39 ` Dov Grobgeld
2012-01-25 19:05 ` Glenn Morris
2012-04-30 5:33 ` Dov Grobgeld
2012-04-30 6:36 ` Dov Grobgeld
2012-05-06 4:13 ` Chong Yidong
2012-05-06 4:55 ` Dov Grobgeld
2012-05-06 5:39 ` Chong Yidong
2012-05-06 7:06 ` Dov Grobgeld
2012-05-07 2:53 ` Chong Yidong
2012-05-07 5:07 ` Dov Grobgeld [this message]
2012-05-07 6:11 ` Chong Yidong
2012-05-07 6:26 ` Chong Yidong
2012-05-08 5:33 ` Dov Grobgeld
2012-05-08 7:56 ` Dov Grobgeld
2012-05-08 8:28 ` Chong Yidong
2012-05-08 11:59 ` Dov Grobgeld
2012-05-08 16:25 ` Chong Yidong
2012-05-08 17:47 ` Eli Zaretskii
2012-05-08 21:07 ` Dov Grobgeld
2012-05-08 21:24 ` Andreas Schwab
2012-05-08 21:30 ` Dov Grobgeld
2012-05-09 7:47 ` Andreas Schwab
2012-05-09 8:44 ` Dov Grobgeld
2012-05-09 17:36 ` Eli Zaretskii
2012-05-10 6:00 ` Dov Grobgeld
2012-05-10 14:13 ` Chong Yidong
2012-05-10 19:07 ` Dov Grobgeld
2012-05-10 20:25 ` Stefan Monnier
2012-05-11 6:33 ` Chong Yidong
2012-05-11 8:29 ` Dov Grobgeld
2012-05-11 9:47 ` Eli Zaretskii
2012-05-11 13:27 ` Chong Yidong
2012-11-05 20:36 ` Dov Grobgeld
2012-11-05 20:46 ` Eli Zaretskii
2012-11-05 23:51 ` Stefan Monnier
2012-05-10 16:32 ` Eli Zaretskii
2012-05-10 18:43 ` Dov Grobgeld
2012-05-08 17:38 ` Eli Zaretskii
2012-12-14 4:14 ` bug#10580: 24.0.92; gdb initialization takes more than one minute at 100 Jean-Philippe Gravel
2012-12-18 4:45 ` Jean-Philippe Gravel
2012-12-21 4:01 ` Chong Yidong
2013-03-01 3:31 ` Jean-Philippe Gravel
2013-03-11 17:14 ` Stefan Monnier
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