kern/182139: lock order reversal
Mark Linimon
linimon at lonesome.com
Tue Sep 17 01:30:02 UTC 2013
The following reply was made to PR kern/182139; it has been noted by GNATS.
From: Mark Linimon <linimon at lonesome.com>
To: bug-followup at FreeBSD.org
Cc:
Subject: Re: kern/182139: lock order reversal
Date: Mon, 16 Sep 2013 20:27:47 -0500
----- Forwarded message from "John D. Hendrickson and Sara Darnell" <johnandsara2 at cox.net> -----
Date: Mon, 16 Sep 2013 16:30:24 -0400
From: "John D. Hendrickson and Sara Darnell" <johnandsara2 at cox.net>
To: J B <jb.1234abcd at gmail.com>
Cc: freebsd-bugs at FreeBSD.org
Subject: Re: kern/182139: lock order reversal
User-Agent: Thunderbird 2.0.0.24 (X11/20100228)
i don't get that message using linux. however i had to solve a bad
IDE drive problem once caused by microsoft software the IDE company
installed on it.
what is your question?
#1) wrong lock order is very serious: it's the whole damn disk hw and
driver is built for that: if that fails you have dick. lock order is
all that is between your data and being trashed by old data before
getting on disk (if it gets on disk, with wrong locks)
#2) if mount throws messages it could be a hw error, driver problem,
fat table mutation, etc. it really depends you have to find out. i'm
saying: do you know where and when the problem is thrown? because
most locking is in driver code or memory caching code.
for example, maybe a wrong fat table entry causes a glitch which
causes the kernel to panic while sorting lock order - and you don't
see or haven't read the source code to know that's what's going on.
i haven't tried bsd yet because it seems so many messages point out
serious problems recently developing (caused after bsd stable public
release by hackers making "improvements" to bsd). i was only going to
try it becuase it used to be "rock solid" and "fully compiled". bsd
channel scares me as to how many problems and why: from any gov agent
or company all over the world hacks into drivers? ughh.
is there any management or overview of who is hacking into what parts
of bsd these days? or why? i mean, does the univ. of cal. have
professors that have keys? or do foreigners have keys and are calling
it "bsd" when it isn't?
i know in my area as soon as gov workers invested in microsoft stock
all unix classes closed and classes started requiring ms use (the area
had few compared to CA to begin with). ms moved into area and got gov
contracts. recently i think a few unix classes have arrived back. but
nothing with funding or bite, ie, for e-commerce and e-gov. though
apple does (some) of that. apple makes progress there. but most
classes still require ms boxes. all a damn scam if you ask me.
well good luck. hope some release for bsd is called stable and i get
to try it.
----- End forwarded message -----
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