From: Oleg Nesterov <oleg@redhat.com>
To: Tom Tromey <tromey@redhat.com>
Cc: archer@sourceware.org, utrace-devel@redhat.com
Subject: problems with v3 (Was: gdbstub initial code, v3)
Date: Thu, 12 Aug 2010 23:55:00 -0000 [thread overview]
Message-ID: <20100812235228.GA15051@redhat.com> (raw)
In-Reply-To: <m3iq3g5tv2.fsf@fleche.redhat.com>
On 08/11, Tom Tromey wrote:
>
> >>>>> "Oleg" == Oleg Nesterov <oleg@redhat.com> writes:
>
> Oleg> So, the patch below fixes the problem, and gdb + /proc/ugdb seems
> Oleg> to work.
>
> Oleg> Indeed, gdb sees that this fd is not pipe/tcp and uses the "hardwire"
> Oleg> serial_ops, but hardwire_readchar() doesn't play well with select().
>
> Oleg> Please teach gdb to use poll/select ?
>
> I looked at this a little bit. It seems to me that the "hardwire" stuff
> is for talking to ttys, and we instead want gdb to be using the pipe code.
I didn't verify this, but I don't think so. Please look at pipe_open().
Perhaps it makes sense to serial_add_interface("ugdb"), I dunno.
OK. I was going to add some cleanups and send the new version today.
But after some testing (without gdb) I hit the kernel crashes. This
makes me think that probably something is wrong ;)
As usual, I can't blame my code. I am still investigating, the crash
is not easy to reproduce, but so far I _suspect_ the problems in utrace
code. At least utrace_barrier()->signal_pending() is definitely not
right.
Will continue tomorrow.
Oleg.
next prev parent reply other threads:[~2010-08-12 23:55 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-12 0:01 gdbstub initial code, v3 Oleg Nesterov
2010-08-12 1:14 ` Oleg Nesterov
2010-08-12 2:40 ` Oleg Nesterov
2010-08-12 4:37 ` Tom Tromey
2010-08-12 23:55 ` Oleg Nesterov [this message]
2010-08-13 1:45 ` problems with v3 Tom Tromey
2010-08-13 1:59 ` Roland McGrath
2010-08-13 4:37 ` Tom Tromey
2010-08-13 8:30 ` Roland McGrath
2010-08-13 16:31 ` Tom Tromey
2010-08-13 21:15 ` Oleg Nesterov
2010-08-13 21:18 ` Tom Tromey
2010-08-13 14:08 ` Daniel Jacobowitz
2010-08-13 20:56 ` problems with v3 (Was: gdbstub initial code, v3) Oleg Nesterov
2010-08-13 21:31 ` Roland McGrath
2010-08-13 1:02 ` gdbstub initial code, v3 Roland McGrath
2010-08-12 14:52 ` Kevin Buettner
2010-08-13 0:53 ` Roland McGrath
2010-08-13 3:31 ` Kevin Buettner
2010-08-12 15:06 ` Frank Ch. Eigler
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