linux-ext4 - Re: [PATCH 0/19 v3] ext4: Fix transaction overflow due to revoke descriptors

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Message-ID: <20191019191933.GA25841@mit.edu>
Date:   Sat, 19 Oct 2019 15:19:33 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 0/19 v3] ext4: Fix transaction overflow due to revoke
 descriptors

Hi Jan,

I've tried applying this patch set against 5.4-rc3, and I'm finding a
easily reproducible failure using:

	kvm-xfstests -c ext3conv ext4/039

It is the BUG_ON in fs/jbd2/commit.c, around line 570:

	J_ASSERT(commit_transaction->t_nr_buffers <=
		 atomic_read(&commit_transaction->t_outstanding_credits));

The failure (with the obvious debugging printk added) is:

ext4/039		[15:13:16][    6.747101] run fstests ext4/039 at 2019-10
-19 15:13:16
[    7.018766] Mounted ext4 file system at /vdc supports timestamps until 2038 (
0x7fffffff)
[    8.227631] JBD2: t_nr_buffers 226, t_outstanding_credits=223
[    8.229215] ------------[ cut here ]------------
[    8.230249] kernel BUG at fs/jbd2/commit.c:573!
     	       ...

The full log is attached (although the stack trace isn't terribly
interesting, since this is being run out of kjournald2).

						- Ted

View attachment "log.201910191513" of type "text/plain" (6957 bytes)