linux-kernel - Re: Nobody cared about IRQs at shutdown

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, 1 Dec 2010 09:59:49 -0500 (EST)
From:	Alan Stern <stern@...land.harvard.edu>
To:	"Alexander E. Patrakov" <patrakov@...il.com>
cc:	linux-kernel@...r.kernel.org, <linux-usb@...r.kernel.org>
Subject: Re: Nobody cared about IRQs at shutdown

On Wed, 1 Dec 2010, Alexander E. Patrakov wrote:

> Alan Stern wrote:
> > On Tue, 30 Nov 2010, Alexander E. Patrakov wrote:
> > 
> > > In fact, I think that there is something bad, not specific to USB, 
> > > FireWire or SATA. Without systemd, all those subsystems function 
> > > properly at shutdown. With systemd, it looks like there are many 
> > > mishandled interrupts (all of USB, FireWire and SATA) at shutdown.
> > > WhatÂ Â   could be this common thing? ACPI?
> > 
> > I don't know -- what is systemd?
> 
> Systemd is a new init developed by Lennart Poettering. You can learn more at http://freedesktop.org/wiki/Software/systemd
> 
> It employs high concurrency in starting and stopping services, starts many things on demand and thus boots faster than the traditional SysV init. And also exposes this bug :(

All right.

One last test.  What happens if you unbind the firewire driver and all
the UHCI controllers except the one attached to IRQ 16?

Possible explanations: IRQs are being misrouted, so the system thinks
it gets IRQ 16 when in fact a different interrupt line was activated
(this is related to ACPI, but I don't see any connection to systemd).  
Or the interrupt layer is malfunctioning and it thinks IRQs are
arriving when they aren't.

Alan Stern

--
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/