linux-kernel - Re: [PATCH -next 0/9] dm-raid, md/raid: fix v6.7 regressions part2

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Date: Mon, 4 Mar 2024 09:07:10 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: Xiao Ni <xni@...hat.com>, Yu Kuai <yukuai1@...weicloud.com>
Cc: zkabelac@...hat.com, agk@...hat.com, snitzer@...nel.org,
 mpatocka@...hat.com, dm-devel@...ts.linux.dev, song@...nel.org,
 heinzm@...hat.com, neilb@...e.de, jbrassow@...hat.com,
 linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
 yi.zhang@...wei.com, yangerkun@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH -next 0/9] dm-raid, md/raid: fix v6.7 regressions part2

Hi,

在 2024/03/03 21:16, Xiao Ni 写道:
> Hi all
> 
> There is a error report from lvm regression tests. The case is
> lvconvert-raid-reshape-stripes-load-reload.sh. I saw this error when I
> tried to fix dmraid regression problems too. In my patch set,  after
> reverting ad39c08186f8a0f221337985036ba86731d6aafe (md: Don't register
> sync_thread for reshape directly), this problem doesn't appear.

How often did you see this tes failed? I'm running the tests for over
two days now, for 30+ rounds, and this test never fail in my VM.

Thanks,
Kuai

> 
> I put the log in the attachment.
> 
> On Fri, Mar 1, 2024 at 6:03 PM Yu Kuai <yukuai1@...weicloud.com> wrote:
>>
>> From: Yu Kuai <yukuai3@...wei.com>
>>
>> link to part1: https://lore.kernel.org/all/CAPhsuW7u1UKHCDOBDhD7DzOVtkGemDz_QnJ4DUq_kSN-Q3G66Q@mail.gmail.com/
>>
>> part1 contains fixes for deadlocks for stopping sync_thread
>>
>> This set contains fixes:
>>   - reshape can start unexpected, cause data corruption, patch 1,5,6;
>>   - deadlocks that reshape concurrent with IO, patch 8;
>>   - a lockdep warning, patch 9;
>>
>> I'm runing lvm2 tests with following scripts with a few rounds now,
>>
>> for t in `ls test/shell`; do
>>          if cat test/shell/$t | grep raid &> /dev/null; then
>>                  make check T=shell/$t
>>          fi
>> done
>>
>> There are no deadlock and no fs corrupt now, however, there are still four
>> failed tests:
>>
>> ###       failed: [ndev-vanilla] shell/lvchange-raid1-writemostly.sh
>> ###       failed: [ndev-vanilla] shell/lvconvert-repair-raid.sh
>> ###       failed: [ndev-vanilla] shell/lvcreate-large-raid.sh
>> ###       failed: [ndev-vanilla] shell/lvextend-raid.sh
>>
>> And failed reasons are the same:
>>
>> ## ERROR: The test started dmeventd (147856) unexpectedly
>>
>> I have no clue yet, and it seems other folks doesn't have this issue.
>>
>> Yu Kuai (9):
>>    md: don't clear MD_RECOVERY_FROZEN for new dm-raid until resume
>>    md: export helpers to stop sync_thread
>>    md: export helper md_is_rdwr()
>>    md: add a new helper reshape_interrupted()
>>    dm-raid: really frozen sync_thread during suspend
>>    md/dm-raid: don't call md_reap_sync_thread() directly
>>    dm-raid: add a new helper prepare_suspend() in md_personality
>>    dm-raid456, md/raid456: fix a deadlock for dm-raid456 while io
>>      concurrent with reshape
>>    dm-raid: fix lockdep waring in "pers->hot_add_disk"
>>
>>   drivers/md/dm-raid.c | 93 ++++++++++++++++++++++++++++++++++----------
>>   drivers/md/md.c      | 73 ++++++++++++++++++++++++++--------
>>   drivers/md/md.h      | 38 +++++++++++++++++-
>>   drivers/md/raid5.c   | 32 ++++++++++++++-
>>   4 files changed, 196 insertions(+), 40 deletions(-)
>>
>> --
>> 2.39.2
>>