linux-kernel - Re: [BUG] WARNING: CPU: 3 PID: 1 at mm/debug_vm

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Message-ID: <20211013173734.273dbf57@gandalf.local.home>
Date:   Wed, 13 Oct 2021 17:37:34 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Borislav Petkov <bp@...en8.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Gavin Shan <gshan@...hat.com>,
        Anshuman Khandual <anshuman.khandual@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Gerald Schaefer <gerald.schaefer@...ux.ibm.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "the arch/x86 maintainers" <x86@...nel.org>
Subject: Re: [BUG] WARNING: CPU: 3 PID: 1 at mm/debug_vm_pgtable.c:493

On Tue, 12 Oct 2021 12:15:40 -0700
Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> You might add some debugging to the x86 pud_set_huge() function,
> something like the attached (obviously entirely untested) patch.

Well, I've applied this patch, and have yet to reproduce it.

So, I added this to my "apply before testing" patch set, and if it triggers
again, I should have more info.

-- Steve