linux-kernel - Re: [patch V9 10/39] x86/entry: Provide helpers for execute on irqstack

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Date:   Tue, 09 Jun 2020 22:50:50 +0200
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Qian Cai <cai@....pw>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Andy Lutomirski <luto@...nel.org>,
        Andrew Cooper <andrew.cooper3@...rix.com>,
        X86 ML <x86@...nel.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Alexandre Chartre <alexandre.chartre@...cle.com>,
        Frederic Weisbecker <frederic@...nel.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Petr Mladek <pmladek@...e.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Brian Gerst <brgerst@...il.com>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Josh Poimboeuf <jpoimboe@...hat.com>,
        Will Deacon <will@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Wei Liu <wei.liu@...nel.org>,
        Michael Kelley <mikelley@...rosoft.com>,
        Jason Chen CJ <jason.cj.chen@...el.com>,
        Zhao Yakui <yakui.zhao@...el.com>,
        Alexander Potapenko <glider@...gle.com>
Subject: Re: [patch V9 10/39] x86/entry: Provide helpers for execute on irqstack

Qian,

Thomas Gleixner <tglx@...utronix.de> writes:
>> BAD (after oom02)
>> # cat /sys/kernel/debug/stackdepot/info
>> Unique stacks: 140476
>
> That's indeed odd. I try to reproduce and figure out what really breaks
> here.

I checked your config file and I think I know where this comes from. Can
you plase disable KASAN just for testing purposes and compare before
after again?

Thanks,

        tglx