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From:   Thomas Gleixner <tglx@linutronix.de>
To:     Leon Romanovsky <leon@kernel.org>, Ingo Molnar <mingo@kernel.org>
Cc:     Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, x86 <x86@kernel.org>,
        Suresh Siddha <suresh.b.siddha@intel.com>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86/apic: Fix circular locking dependency between console and hrtimer locks
In-Reply-To: <20200414070502.GR334007@unreal>
References: <20200407170925.1775019-1-leon@kernel.org> <20200414054836.GA956407@unreal> <20200414062454.GA84326@gmail.com> <20200414070502.GR334007@unreal>
Date:   Mon, 27 Apr 2020 17:35:18 +0200
Message-ID: <87v9llosax.fsf@nanos.tec.linutronix.de>
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Sender: linux-kernel-owner@vger.kernel.org
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Leon Romanovsky <leon@kernel.org> writes:
> But if we are talking about other weirdnesses, I have another splat in my
> QEMU machine, which is different, but from the same code area.

It's a completely different code area, really. This triggers in
deactivate_slab().

> [    1.383968] ACPI: Added _OSI(Module Device)
> [    1.385684] ACPI: Added _OSI(Processor Device)
> [    1.389345] ACPI: Added _OSI(3.0 _SCP Extensions)
> [    1.389345] ACPI: Added _OSI(Processor Aggregator Device)
> [    1.393454] ACPI: Added _OSI(Linux-Dell-Video)
> [    1.394920] ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
> [    1.396481] ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
> [    1.793418] ACPI: 1 ACPI AML tables successfully acquired and loaded
> [    1.845452]
> [    1.846768] =============================
> [    1.849293] [ BUG: Invalid wait context ]

Do you have CONFIG_PROVE_RAW_LOCK_NESTING enabled? If yes, please
disable it. The Kconfig option explains that this will trigger
splats.

If not, then this is mysterious but has absolutely nothing to do with
the other thing. It's also completely unrelated to ACPI ...

Thanks,

        tglx