linux-kernel - Re: [PATCH 09/16] sparc64: use the generic get_user_pages

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Date:   Wed, 17 Jul 2019 15:04:56 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     "Dmitry V. Levin" <ldv@...linux.org>
Cc:     Christoph Hellwig <hch@....de>,
        Khalid Aziz <khalid.aziz@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        "David S. Miller" <davem@...emloft.net>,
        Anatoly Pugachev <matorola@...il.com>,
        sparclinux@...r.kernel.org, Linux-MM <linux-mm@...ck.org>,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 09/16] sparc64: use the generic get_user_pages_fast code

On Wed, Jul 17, 2019 at 2:59 PM Dmitry V. Levin <ldv@...linux.org> wrote:
>
> So this ended up as commit 7b9afb86b6328f10dc2cad9223d7def12d60e505
> (thanks to Anatoly for bisecting) and introduced a regression:
> futex.test from the strace test suite now causes an Oops on sparc64
> in futex syscall.

Can you post the oops here in the same thread too? Maybe it's already
posted somewhere else, but I can't seem to find anything likely on
lkml at least..

On x86-64, it obviously just causes the (expected) EFAULT error from
the futex call.

Somebody with access to sparc64 probably needs to debug this, but
having the exact oops wouldn't hurt...

             Linus