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From: Chris Wilson <chris@chris-wilson.co.uk>
To: Linus Torvalds <torvalds@linux-foundation.org>,
	Linux List Kernel Mailing <linux-kernel@vger.kernel.org>
Cc: Bandan Das <bsd@redhat.com>, Thomas Gleixner <tglx@linutronix.de>
Subject: Re: Linux 5.3-rc7
Date: Sat, 07 Sep 2019 11:10:05 +0100
Message-ID: <156785100521.13300.14461504732265570003@skylake-alporthouse-com> (raw)
In-Reply-To: <CAHk-=wi_nBULUyO=OKtNBCZ+VSqdOcEiUeFqXTQY_D5ga5k4gQ@mail.gmail.com>

Quoting Linus Torvalds (2019-09-02 18:28:26)
> Bandan Das:
>       x86/apic: Include the LDR when clearing out APIC registers

Apologies if this is known already, I'm way behind on email.

I've bisected

[   18.693846] smpboot: CPU 0 is now offline
[   19.707737] smpboot: Booting Node 0 Processor 0 APIC 0x0
[   29.707602] smpboot: do_boot_cpu failed(-1) to wakeup CPU#0

https://intel-gfx-ci.01.org/tree/drm-tip/igt@perf_pmu@cpu-hotplug.html

to 558682b52919. (Reverts cleanly and fixes the problem.)

I'm guessing that this is also behind the suspend failures, missing
/dev/cpu/0/msr, and random perf_event_open() failures we have observed
in our CI since -rc7 across all generations of Intel cpus.
-Chris

  reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-09-02 17:28 Linus Torvalds
2019-09-07 10:10 ` Chris Wilson [this message]
2019-09-07 14:29   ` Thomas Gleixner
2019-09-07 14:41     ` Chris Wilson
2019-09-07 15:00       ` Thomas Gleixner
2019-09-07 15:24         ` Chris Wilson
2019-09-07 20:12           ` Thomas Gleixner
2019-09-07 19:17         ` Linus Torvalds
2019-09-07 19:27           ` Linus Torvalds
2019-09-09 13:54             ` Bandan Das
2019-09-07 20:44           ` Thomas Gleixner
2019-09-07 21:13             ` Linus Torvalds
2019-09-08 11:02               ` Sasha Levin

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