From owner-freebsd-mips@freebsd.org  Mon Nov  9 21:43:05 2015
Return-Path: <owner-freebsd-mips@freebsd.org>
Delivered-To: freebsd-mips@mailman.ysv.freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org
 [IPv6:2001:1900:2254:206a::19:1])
 by mailman.ysv.freebsd.org (Postfix) with ESMTP id 936BCA2A86F
 for <freebsd-mips@mailman.ysv.freebsd.org>;
 Mon,  9 Nov 2015 21:43:05 +0000 (UTC)
 (envelope-from adrian.chadd@gmail.com)
Received: from mail-io0-x22c.google.com (mail-io0-x22c.google.com
 [IPv6:2607:f8b0:4001:c06::22c])
 (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits))
 (Client CN "smtp.gmail.com",
 Issuer "Google Internet Authority G2" (verified OK))
 by mx1.freebsd.org (Postfix) with ESMTPS id 5584914DD
 for <freebsd-mips@freebsd.org>; Mon,  9 Nov 2015 21:43:05 +0000 (UTC)
 (envelope-from adrian.chadd@gmail.com)
Received: by iodd200 with SMTP id d200so200923723iod.0
 for <freebsd-mips@freebsd.org>; Mon, 09 Nov 2015 13:43:04 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113;
 h=mime-version:sender:in-reply-to:references:date:message-id:subject
 :from:to:cc:content-type;
 bh=3Cp+T4fjMMErIFvbmVQ4jGR8wZiUR9oR9wH+uEGvypg=;
 b=FdK0Mc98FwZ/wCWTYdq3xoD12+eeCIyaStW9bpwKK0X8ilwOW9aPz0feI5XQ8PdgpH
 2P1W2Ng1QCSu0paZoIgK7d4iphA3QtfrD27jw+I6ab+JVeVZF42vonFvTdLb5TRqJtIQ
 0qsR5DrGOC2Xx0RmH4/jBTpOEiB5JqFIhVNPnkpaOiEB9gXluWvLouTVLkxri+2gU65o
 5XUldoC6niqfFB3Xa3fnotlgYivUI4s8KzG78pHKQNuJeXtrIzsEya12RNVH21mjpqw+
 YeVLpp9wZhNdclxBb/vG2XMBkwbN5WV4PON88sT05d1YJfvLyEKRrt1Ctw4pvSCUGW0c
 Ho0g==
MIME-Version: 1.0
X-Received: by 10.107.46.142 with SMTP id u14mr567353iou.165.1447105384694;
 Mon, 09 Nov 2015 13:43:04 -0800 (PST)
Sender: adrian.chadd@gmail.com
Received: by 10.36.217.196 with HTTP; Mon, 9 Nov 2015 13:43:03 -0800 (PST)
In-Reply-To: <CAJ-Vmo=QUUkTfQ7pvr_V+CQ8zQWOoqp3H8hD9LUR8C5U-5N=Ag@mail.gmail.com>
References: <56348063.3090508@grosbein.net> <563523CA.3040207@grosbein.net>
 <CAJ-Vmonpd8R5C+NvhOGFD1okkkit990DV8c4Dm+LmpZ2uFfVkA@mail.gmail.com>
 <56367686.4090801@grosbein.net>
 <CAJ-VmomtJ9eKfAJYfn4e2S1xWN8-YHo0M0KH-9V=VjNBf6vVVA@mail.gmail.com>
 <563707A0.3040700@grosbein.net>
 <CANCZdfrB0hkjmTU-9NzimBv=X_h-=bF0D2azBxg=9B=kmitv7Q@mail.gmail.com>
 <56370E1D.3040801@grosbein.net>
 <CAJ-Vmo=0vOAq8db_GeLWmdXr7xJdzUh44ZZJrQ9vVdpvzT9hiQ@mail.gmail.com>
 <563F5630.2000407@grosbein.net> <563F6F6F.1010807@grosbein.net>
 <CAJ-Vmo=fPSi7yZO5Xjodg8HPtTLd44Y9Y_8qg4EgTGwEpHO10A@mail.gmail.com>
 <563F91A8.9080702@grosbein.net>
 <CAJ-VmomUvoUerMS20qQsQujcjULVA=_jaLp9Mh3fU1fEpdwzZA@mail.gmail.com>
 <CAJ-Vmo=eUUZ928KgQbyOi8EdDFSmxhjvDOyAMvfXsqwDbO96ng@mail.gmail.com>
 <5640C0FD.2040803@grosbein.net>
 <CAJ-Vmo=6mztfvvBd91LPO5H418K8vW=+Lk=6V5Z_y5DHu7v7HA@mail.gmail.com>
 <5640F315.5020303@grosbein.net>
 <CAJ-VmokpWM=d+tEFv8a8eU91UimVZ9W8da2QkKCTDjd+2ZM_LQ@mail.gmail.com>
 <56410214.3070901@grosbein.net>
 <CAJ-Vmo=QUUkTfQ7pvr_V+CQ8zQWOoqp3H8hD9LUR8C5U-5N=Ag@mail.gmail.com>
Date: Mon, 9 Nov 2015 13:43:03 -0800
X-Google-Sender-Auth: dqWZaB7molZ9RWUF3bxMcz3GTkE
Message-ID: <CAJ-VmomA27NcNCjx00DrZzFOU9bGYucUhbPXodH2uvNd8eJ3wg@mail.gmail.com>
Subject: Re: USB-related problem
From: Adrian Chadd <adrian@freebsd.org>
To: Eugene Grosbein <eugen@grosbein.net>
Cc: "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org>
Content-Type: text/plain; charset=UTF-8
X-BeenThere: freebsd-mips@freebsd.org
X-Mailman-Version: 2.1.20
Precedence: list
List-Id: Porting FreeBSD to MIPS <freebsd-mips.freebsd.org>
List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-mips>,
 <mailto:freebsd-mips-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-mips/>
List-Post: <mailto:freebsd-mips@freebsd.org>
List-Help: <mailto:freebsd-mips-request@freebsd.org?subject=help>
List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-mips>,
 <mailto:freebsd-mips-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 09 Nov 2015 21:43:05 -0000

Hi,

How much C do you know? Are you able to add some debugging to
sched_sync() (which IIRC is the syncer thread) and work out where it's
getting stuck and spinning?

(The MIPS debugger implementation unfortunately doesn't unwind through
the serial break, so "syncer" in backtrace looks like it started at
the hardware interrupt that triggered it..)



-adrian