linux-kernel - Re: Linux 4.15-rc2: Regression in resume from ACPI S3

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Date:   Thu, 14 Dec 2017 14:24:22 +0100 (CET)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
cc:     Bjorn Helgaas <helgaas@...nel.org>,
        Maarten Lankhorst <dev@...ankhorst.nl>,
        Michal Hocko <mhocko@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Andy Lutomirski <luto@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        the arch/x86 maintainers <x86@...nel.org>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
        linux-pci@...r.kernel.org, linux-pm@...r.kernel.org
Subject: Re: Linux 4.15-rc2: Regression in resume from ACPI S3

On Thu, 14 Dec 2017, Thomas Gleixner wrote:
> Now, what's different vs. 4.14:
> 
> The 4.14 code accidentaly had the irq descriptor for this vector still
> populated in the old CPU due to the convoluted way the vector allocation
> worked. I have still to investigate if one of those cases is actually
> leaking the descriptor, which would be a fatal bug.

It doesn't leak. It repopulates it at the same place out of sheer luck.

Thanks,

	tglx