Re: [PATCH -next v2 0/6] md: fix that MD_RECOVERY_RUNNING can be cleared while sync_thread is still running

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Hi,

在 2023/05/29 21:20, Yu Kuai 写道:
From: Yu Kuai <yukuai3@xxxxxxxxxx>

Changes in v2:
  - rebase for the latest md-next

Patch 1 revert the commit because it will cause MD_RECOVERY_RUNNING to be
cleared while sync_thread is still running. The deadlock this patch tries
to fix will be fixed by patch 2-5.

Patch 6 enhance checking to prevent MD_RECOVERY_RUNNING to be cleared
while sync_thread is still running.

Any suggestions on this patchset? I already sent regression test
for the deadlock problem for both raid10 and raid456.

Thanks,
Kuai

Yu Kuai (6):
   Revert "md: unlock mddev before reap sync_thread in action_store"
   md: refactor action_store() for 'idle' and 'frozen'
   md: add a mutex to synchronize idle and frozen in action_store()
   md: refactor idle/frozen_sync_thread() to fix deadlock
   md: wake up 'resync_wait' at last in md_reap_sync_thread()
   md: enhance checking in md_check_recovery()

  drivers/md/dm-raid.c |   1 -
  drivers/md/md.c      | 124 +++++++++++++++++++++++++++++--------------
  drivers/md/md.h      |   5 ++
  3 files changed, 88 insertions(+), 42 deletions(-)


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