linux-kernel - Re: irq_fpu_usable() is irreliable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 18 Nov 2015 20:59:35 +0100
From:	"Jason A. Donenfeld" <Jason@...c4.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>, mingo@...hat.com,
	hpa@...or.com, LKML <linux-kernel@...r.kernel.org>
Subject: Re: irq_fpu_usable() is irreliable

Hi Ingo,

The plot thickens, once again.

> > Also, what CPU does the test system have, Intel or AMD? The FPU behavior can be
> > very different in the two cases.
> Intel 3820QM, but inside VMWare Workstation 12.

Trying this on bare metal, the problem goes away! Though the VM is 4.2
and my bare metal is 4.3. Perhaps your recent changes did something.

But more likely, there's some funny business happening with VMWare.
Any speculation about this? Fascinating issue...

Jason
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/