Date: Tue, 06 Mar 2007 15:10:40 -0800 From: Doug Barton <dougb@FreeBSD.org> To: Alexander Leidinger <Alexander@Leidinger.net> Cc: freebsd-emulation@FreeBSD.org, Jung-uk Kim <jkim@FreeBSD.org> Subject: Re: Linux emulation instability Message-ID: <45EDF4F0.5080605@FreeBSD.org> In-Reply-To: <20070306092828.h6klpijtomcogc0w@webmail.leidinger.net> References: <45EB55DD.4030201@FreeBSD.org> <200703051156.34866.jkim@FreeBSD.org> <45ECA90E.3050202@FreeBSD.org> <200703051900.22022.jkim@FreeBSD.org> <45ECB049.8070304@FreeBSD.org> <20070306092828.h6klpijtomcogc0w@webmail.leidinger.net>
next in thread | previous in thread | raw e-mail | index | archive | help
Alexander Leidinger wrote:
> Quoting Doug Barton <dougb@FreeBSD.org> (from Mon, 05 Mar 2007 16:05:29
> -0800):
>
>> compat.linux.osrelease: 2.4.2
>>
>> Based on your description, and the fact that you're running with
>> ULE+libthr but with UP, I'd be pretty comfortable saying an SMP problem
>> is "likely" at this point. If someone wants to come up with some
>> patches that will likely help the futex+SMP problem, I'll be glad to
>> test them. Otherwise further testing on my part will have to wait till
>> I get some more spare cycles.
>
> I would be surprised if 2.6.x features like futexes are used with 2.4.2.
> We don't disable futexes with 2.4.2, but some 2.6.x features are
> disabled and the glibc of linux_base-fc4 doesn't switch to using 2.6.x
> features when osrelease is set to 2.4.2. Additionally futexes are not
> fully implemented on amd64 (at least not in HEAD).
>
> Also you should not focus on libthr, as it is not used for linux stuff.
Thanks for clearing that up. Would switching to a different linux_base
port, and/or setting compat.linux.osrelease to something else be a
useful exercise? This is thunderbird 2.0b2, so it may be expecting 2.6
stuff that we're not giving it, which may be why it's crashing.
> It would be interesting to know where linux-thunderbird locks up. With a
> ktrace and maybe the output of linuxulator debugging messages we may be
> able to narrow this down to the real problem.
Ok, ktrace I can handle, what kind of debugging needs to be set for
the linuxulator?
> At this point I'm not 100% convinced it is a linux problem per se.
It's 100% reproducible with the combination of
ULE+SMP+linux-thunderbird. OTOH, I did pretty extensive testing
without ULE (still running fine that way now, btw), and with ULE but
without using linux-thunderbird, and it was fine. I will buy that the
linux-thunderbird code might be doing something it shouldn't, but we
shouldn't reboot or freeze because of it in any case.
Doug
--
This .signature sanitized for your protection
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?45EDF4F0.5080605>