linux-ext4 - Re: [PATCH] jbd2: fix outstanding credits assert in jbd2_journal_commit

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Message-Id: <165725003056.1812964.12369347290179882650.b4-ty@mit.edu>
Date:   Thu,  7 Jul 2022 23:19:58 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     yi.zhang@...wei.com, linux-ext4@...r.kernel.org
Cc:     "Theodore Ts'o" <tytso@....edu>, yukuai3@...wei.com,
        adilger.kernel@...ger.ca, jack@...e.cz
Subject: Re: [PATCH] jbd2: fix outstanding credits assert in jbd2_journal_commit_transaction()

On Sat, 11 Jun 2022 21:04:26 +0800, Zhang Yi wrote:
> We catch an assert problem in jbd2_journal_commit_transaction() when
> doing fsstress and request falut injection tests. The problem is
> happened in a race condition between jbd2_journal_commit_transaction()
> and ext4_end_io_end(). Firstly, ext4_writepages() writeback dirty pages
> and start reserved handle, and then the journal was aborted due to some
> previous metadata IO error, jbd2_journal_abort() start to commit current
> running transaction, the committing procedure could be raced by
> ext4_end_io_end() and lead to subtract j_reserved_credits twice from
> commit_transaction->t_outstanding_credits, finally the
> t_outstanding_credits is mistakenly smaller than t_nr_buffers and
> trigger assert.
> 
> [...]

Applied, thanks!

[1/1] jbd2: fix outstanding credits assert in jbd2_journal_commit_transaction()
      commit: f8dc286e4d942dab79d1814e0708ac91052a34fa

Best regards,
-- 
Theodore Ts'o <tytso@....edu>