linux-kernel - Re: BUG: drivers/char/random.c:986

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Message-ID: <20140829112655.GB20278@thunk.org>
Date:	Fri, 29 Aug 2014 07:26:55 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Calvin Owens <jcalvinowens@...il.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org
Subject: Re: BUG: drivers/char/random.c:986

On Thu, Aug 28, 2014 at 10:01:50PM -0700, Calvin Owens wrote:
> Hello all,
> 
> I hit this BUG_ON() on my laptop a few days ago: http://i.imgur.com/N1GQeJW.jpg
> 
> In the current upstream, this corresponds to line 1022:
> 
> 	BUG_ON(r->entropy_count > r->poolinfo->poolfracbits);
> 
> It triggered when I executed `dd if=/dev/urandom of=file bs=N count=1`
> while watching a YouTube video in Chromium. I don't recall the exact value of
> N I used, but it was rather large (>50M), and a few bytes past an even power
> of two (I was creating a file to test an HTTP upload script I was working on).
> 
> I haven't had any luck reproducing this on the current upstream or the version
> it was originally triggered on.

Known bug, fixed in 79a8468747c5 which landed in mainline as of
3.16-rc6.  And you were running 3.16-rc4.  (BTW, in the future it
would be nice if you mentioned the kernel version you were running in;
I found it by looking at the jpg, but it's always more convenient to
be able to read it in ASCII.  :-)

Cheers,

						- Ted
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