From: Jeff Dike <jdike@addtoit.com>
To: Anthony Brock <Anthony_Brock@ous.edu>
Cc: user-mode-linux-devel@lists.sourceforge.net
Subject: Re: [uml-devel] Problem with /dev/random and rngd daemon
Date: Wed, 1 Jun 2005 16:29:36 -0400 [thread overview]
Message-ID: <20050601202936.GA14652@ccure.user-mode-linux.org> (raw)
In-Reply-To: <s29d94d2.052@ORANGE.OUS.EDU>
On Wed, Jun 01, 2005 at 10:57:59AM -0700, Anthony Brock wrote:
> I'm wondering if the first host to launch is exhausting the entropy
> pool and the second host is attempting to read from an empty pool.
The strace would seem to bear this out:
> open("/dev/hwrng", O_RDONLY) = 3
> rt_sigaction(SIGALRM, {0x400267a0, [], 0}, NULL, 8) = 0
> rt_sigprocmask(SIG_UNBLOCK, [ALRM], NULL, 8) = 0
> alarm(10) = 0
> read(3, 0xbfb50380, 4) = ? ERESTARTSYS (To be restarted)
> --- SIGALRM (Alarm clock) @ 0 (0) ---
> sigreturn() = ? (mask now [RTMIN])
> exit_group(1) = ?
This looks to me like "read from hwrng, but give up after 10 seconds
if nothing happens".
> If this is the case, then I have no idea how you could resolve this
> with multiple UML instances per host.
Can you read /dev/random on the host directly during this time? If
not, and you are out of entropy, I would say you need to find a source
of more of it.
Jeff
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next parent reply other threads:[~2005-06-01 21:27 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <s29d94d2.052@ORANGE.OUS.EDU>
2005-06-01 20:29 ` Jeff Dike [this message]
2005-06-01 17:57 [uml-devel] Problem with /dev/random and rngd daemon Anthony Brock
-- strict thread matches above, loose matches on Subject: below --
2005-06-01 17:09 Anthony Brock
2005-06-01 17:37 ` Jeff Dike
2005-06-01 18:25 ` Blaisorblade
2005-06-01 20:42 ` Jeff Dike
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