linux-kernel - Re: [PATCH 0/5] fix radix tree multi-order iteration race

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Message-ID: <CAPcyv4hy40dRr81aO7mr5LhC4L=es6NXE_kDCO2+USGXovGDiQ@mail.gmail.com>
Date:   Thu, 10 May 2018 15:54:53 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christoph Hellwig <hch@....de>,
        Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>
Subject: Re: [PATCH 0/5] fix radix tree multi-order iteration race

On Thu, May 10, 2018 at 3:48 PM, Andrew Morton
<akpm@...ux-foundation.org> wrote:
> On Tue, 8 May 2018 11:44:24 -0600 Ross Zwisler <ross.zwisler@...ux.intel.com> wrote:
>
>> On Thu, May 03, 2018 at 01:24:25PM -0600, Ross Zwisler wrote:
>> > The following series gets the radix tree test suite compiling again in
>> > the current linux/master, adds a unit test which exposes a race in the
>> > radix tree multi-order iteration code, and then fixes that race.
>> >
>> > This race was initially hit on a v4.15 based kernel and results in a GP
>> > fault.  I've described the race in detail in patches 4 and 5.
>> >
>> > The fix is simple and necessary, and I think it should be merged for
>> > v4.17.
>> >
>> > This tree has gotten positive build confirmation from the 0-day bot,
>> > passes the updated radix tree test suite, xfstests, and the original
>> > test that was hitting the race with the v4.15 based kernel.
>> >
>> > Ross Zwisler (5):
>> >   radix tree test suite: fix mapshift build target
>> >   radix tree test suite: fix compilation issue
>> >   radix tree test suite: add item_delete_rcu()
>> >   radix tree test suite: multi-order iteration race
>> >   radix tree: fix multi-order iteration race
>> >
>> >  lib/radix-tree.c                      |  6 ++--
>> >  tools/include/linux/spinlock.h        |  3 +-
>> >  tools/testing/radix-tree/Makefile     |  6 ++--
>> >  tools/testing/radix-tree/multiorder.c | 63 +++++++++++++++++++++++++++++++++++
>> >  tools/testing/radix-tree/test.c       | 19 +++++++++++
>> >  tools/testing/radix-tree/test.h       |  3 ++
>> >  6 files changed, 91 insertions(+), 9 deletions(-)
>> >
>> > --
>> > 2.14.3
>> >
>>
>> Ping on this series.  Does anyone have any feedback?  Matthew?
>>
>> I'd really like to get it into v4.17.
>>
>> We can take it through the libnvdimm tree, if that's easiest.
>
> There's a copy in Dan's linux-next tree which is missing
>
> - The Link: tag

Yes, I normally don't add those.

> - The Fixes: tag
> - The Reported-by

Those were there.

> - Jan's reviewed-by

Right, Jan's came after I pushed it for -next soaking, but I updated it.

> - the cc:stable tag

That was there too, not sure where you were looking.

> so I think I'll just ignore all that and send this series off to Linus next
> week.

It's all backed out now from my tree.