From owner-freebsd-mips@freebsd.org  Mon Nov  2 08:12:33 2015
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Subject: Re: Broken things on MIPS32 - what I'd like help with!
To: Adrian Chadd <adrian@freebsd.org>,
 "freebsd-mips@freebsd.org" <freebsd-mips@freebsd.org>
References: <CAJ-Vmo=BivugeVDFraUeD1dj3TxeZJWD-jHnF4jmO-7yc+uY5Q@mail.gmail.com>
From: Eugene Grosbein <eugen@grosbein.net>
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Date: Mon, 2 Nov 2015 15:12:15 +0700
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On 02.11.2015 09:33, Adrian Chadd wrote:
> Hi,
> 
> There are a couple of things that are broken on mips32 right now and
> I'm stretched pretty thin for time.
> 
> I'd really appreciate it if someone could help by figuring out what's up.
> 
> * If I use scp to copy something into a USB rootfs on my Carambola2,
> the whole system hangs. I can use ddb to break into things, but
> nothing obvious has shown up. The only two locks are a buflock and a
> vfslock - but I didn't get any LORs from Witness.

I've found that writing USB mounted async easily hangs or traps the kernel
but I can write whole /boot/modules (over 30MB, lots of files) without
a problem if USB is moused "noasync". That is, no soft-updates, no async
and not "sync" - plain old good default mounting mode. It is slow but much more stable.