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From: Anatoly Pugachev <matorola@gmail.com>
To: David Miller <davem@davemloft.net>
Cc: "Dmitry V. Levin" <ldv@altlinux.org>,
	Christoph Hellwig <hch@lst.de>,
	khalid.aziz@oracle.com, torvalds@linux-foundation.org,
	akpm@linux-foundation.org,
	Sparc kernel list <sparclinux@vger.kernel.org>,
	linux-mm@kvack.org,
	Linux Kernel list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 09/16] sparc64: use the generic get_user_pages_fast code
Date: Wed, 24 Jul 2019 22:32:17 +0300	[thread overview]
Message-ID: <CADxRZqx-jEnm4U8oe=tJf5apbvcMuw5OYZUN8h4G68sXFvDsmQ@mail.gmail.com> (raw)
In-Reply-To: <20190718.141405.1070121094691581998.davem@davemloft.net>

On Fri, Jul 19, 2019 at 12:14 AM David Miller <davem@davemloft.net> 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.
> >
> > Here is a heavily stripped down reproducer:
>
> Does not reproduce for me on a T4-2 machine.
>
> So this problem might depend on the type of system you are on,
> I suspect it's one of those "pre-Niagara vs. Niagara and later"
> situations because that's the dividing line between two set of
> wildly different TLB and cache management methods.
>
> What kind of machine are you on?

David,

the first test where it was discovered was done on my test LDOM named
ttip, hardware (hypervisor) is T5-2 server, running under Solaris 11.4
OS.
ttip LDOM is debian sparc64 unstable , so with almost all the latest
software (gcc 8.3.0, binutils 2.32.51.20190707-1, debian GLIBC
2.28-10, etc..)

For another test, i also installed LDOM with oracle sparc linux
https://oss.oracle.com/projects/linux-sparc/ , but I've to install a
more fresh version of gcc on it first, since system installed gcc 4.4
is too old for a git kernel (linux-2.6/Documentation/Changes lists gcc
4.6 as a minimal version), so I choose to install gcc-7.4.0 to /opt/
(leaving system installed gcc 4.4 under /usr/bin). Compiled and
installed git kernel version, i.e. last tag 5.3.0-rc1 and ran the
test. Kernel still produced oops.

  parent reply	other threads:[~2019-07-24 19:32 UTC|newest]

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-25 14:36 switch the remaining architectures to use generic GUP v4 Christoph Hellwig
2019-06-25 14:37 ` [PATCH 01/16] mm: use untagged_addr() for get_user_pages_fast addresses Christoph Hellwig
2019-06-25 14:37 ` [PATCH 02/16] mm: simplify gup_fast_permitted Christoph Hellwig
2019-06-25 14:37 ` [PATCH 03/16] mm: lift the x86_32 PAE version of gup_get_pte to common code Christoph Hellwig
2019-06-25 14:37 ` [PATCH 04/16] MIPS: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-29 14:37   ` Guenter Roeck
2019-06-25 14:37 ` [PATCH 05/16] sh: add the missing pud_page definition Christoph Hellwig
2019-06-25 14:37 ` [PATCH 06/16] sh: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-29 15:15   ` Guenter Roeck
2019-06-25 14:37 ` [PATCH 07/16] sparc64: add the missing pgd_page definition Christoph Hellwig
2019-06-25 14:37 ` [PATCH 08/16] sparc64: define untagged_addr() Christoph Hellwig
2019-06-25 14:37 ` [PATCH 09/16] sparc64: use the generic get_user_pages_fast code Christoph Hellwig
2019-07-17 21:59   ` Dmitry V. Levin
2019-07-17 22:04     ` Linus Torvalds
2019-07-17 23:30       ` Dmitry V. Levin
2019-07-18  0:17         ` Linus Torvalds
2019-07-18  1:21           ` David Miller
2019-07-18 21:43           ` David Miller
2019-07-18 21:14     ` David Miller
2019-07-19  6:00       ` Christoph Hellwig
2019-07-24 19:32       ` Anatoly Pugachev [this message]
2019-07-24 20:13         ` David Miller
2019-07-25 18:33           ` Anatoly Pugachev
2019-07-25 22:52             ` David Miller
2019-07-28  2:09             ` David Miller
2019-07-28 20:00               ` Anatoly Pugachev
2019-07-26 17:58     ` Khalid Aziz
2019-08-09 19:59     ` Anatoly Pugachev
2019-08-10  7:17       ` Christoph Hellwig
2019-08-10 19:36         ` Mikael Pettersson
2019-08-11 20:30           ` Anatoly Pugachev
2019-06-25 14:37 ` [PATCH 10/16] mm: rename CONFIG_HAVE_GENERIC_GUP to CONFIG_HAVE_FAST_GUP Christoph Hellwig
2019-06-25 14:37 ` [PATCH 11/16] mm: reorder code blocks in gup.c Christoph Hellwig
2019-06-25 14:37 ` [PATCH 12/16] mm: consolidate the get_user_pages* implementations Christoph Hellwig
2019-06-25 14:37 ` [PATCH 13/16] mm: validate get_user_pages_fast flags Christoph Hellwig
2019-06-25 14:37 ` [PATCH 14/16] mm: move the powerpc hugepd code to mm/gup.c Christoph Hellwig
2019-06-25 19:37   ` Andrew Morton
2019-06-26  5:49     ` Christoph Hellwig
2019-06-25 14:37 ` [PATCH 15/16] mm: switch gup_hugepte to use try_get_compound_head Christoph Hellwig
2019-06-25 14:37 ` [PATCH 16/16] mm: mark the page referenced in gup_hugepte Christoph Hellwig
  -- strict thread matches above, loose matches on Subject: below --
2019-06-11 14:40 switch the remaining architectures to use generic GUP v3 Christoph Hellwig
2019-06-11 14:40 ` [PATCH 09/16] sparc64: use the generic get_user_pages_fast code Christoph Hellwig
2019-06-11 19:35   ` Khalid Aziz

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