linux-kernel - Re: [LTP] [f2fs] a1e09b03e6: ltp.ADSP024.fail

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Date:   Fri, 7 Jan 2022 14:49:02 -0800
From:   Eric Biggers <ebiggers@...nel.org>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     lkp@...el.com, Linux Memory Management List <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>, lkp@...ts.01.org,
        Jaegeuk Kim <jaegeuk@...nel.org>, ltp@...ts.linux.it
Subject: Re: [LTP] [f2fs]  a1e09b03e6: ltp.ADSP024.fail

On Sun, Dec 26, 2021 at 09:28:52PM +0800, kernel test robot wrote:
> 
> 
> Greeting,
> 
> FYI, we noticed the following commit (built with gcc-9):
> 
> commit: a1e09b03e6f5c1d713c88259909137c0fd264ede ("f2fs: use iomap for direct I/O")
> https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> 
> in testcase: ltp
> version: ltp-x86_64-14c1f76-1_20211221
> with following parameters:
> 
> 	disk: 1HDD
> 	fs: f2fs
> 	test: ltp-aiodio.part2
> 	ucode: 0x21
> 

This is caused by an f2fs bug where it exposes DIO-allocated blocks to users
before they have been initialized.  This test actually fails both before and
after my commit "f2fs: use iomap for direct I/O".  It is nondeterministic, which
is why it may have appeared to be a regression.

I'll start a separate discussion on linux-f2fs-devel about this, since this
thread has too many irrelevant mailing lists and this has been discussed before.

- Eric