6.6-stable review patch. If anyone has any objections, please let me know.
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From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp
commit 524c3853831cf4f7e1db579e487c757c3065165c upstream.
syzbot is reporting possibility of deadlock due to sharing lock_class_key for jbd2_handle across ext4 and ocfs2. But this is a false positive, for one disk partition can't have two filesystems at the same time.
Reported-by: syzbot+6e493c165d26d6fcbf72@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=6e493c165d26d6fcbf72 Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Tested-by: syzbot+6e493c165d26d6fcbf72@syzkaller.appspotmail.com Reviewed-by: Jan Kara jack@suse.cz Message-ID: 987110fc-5470-457a-a218-d286a09dd82f@I-love.SAKURA.ne.jp Signed-off-by: Theodore Ts'o tytso@mit.edu Cc: stable@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/jbd2/journal.c | 6 ++++-- include/linux/jbd2.h | 6 ++++++ 2 files changed, 10 insertions(+), 2 deletions(-)
--- a/fs/jbd2/journal.c +++ b/fs/jbd2/journal.c @@ -1563,7 +1563,6 @@ static journal_t *journal_init_common(st struct block_device *fs_dev, unsigned long long start, int len, int blocksize) { - static struct lock_class_key jbd2_trans_commit_key; journal_t *journal; int err; int n; @@ -1572,6 +1571,7 @@ static journal_t *journal_init_common(st if (!journal) return ERR_PTR(-ENOMEM);
+ lockdep_register_key(&journal->jbd2_trans_commit_key); journal->j_blocksize = blocksize; journal->j_dev = bdev; journal->j_fs_dev = fs_dev; @@ -1601,7 +1601,7 @@ static journal_t *journal_init_common(st journal->j_max_batch_time = 15000; /* 15ms */ atomic_set(&journal->j_reserved_credits, 0); lockdep_init_map(&journal->j_trans_commit_map, "jbd2_handle", - &jbd2_trans_commit_key, 0); + &journal->jbd2_trans_commit_key, 0);
/* The journal is marked for error until we succeed with recovery! */ journal->j_flags = JBD2_ABORT; @@ -1648,6 +1648,7 @@ err_cleanup: kfree(journal->j_wbuf); jbd2_journal_destroy_revoke(journal); journal_fail_superblock(journal); + lockdep_unregister_key(&journal->jbd2_trans_commit_key); kfree(journal); return ERR_PTR(err); } @@ -2229,6 +2230,7 @@ int jbd2_journal_destroy(journal_t *jour crypto_free_shash(journal->j_chksum_driver); kfree(journal->j_fc_wbuf); kfree(journal->j_wbuf); + lockdep_unregister_key(&journal->jbd2_trans_commit_key); kfree(journal);
return err; --- a/include/linux/jbd2.h +++ b/include/linux/jbd2.h @@ -1266,6 +1266,12 @@ struct journal_s */ struct lockdep_map j_trans_commit_map; #endif + /** + * @jbd2_trans_commit_key: + * + * "struct lock_class_key" for @j_trans_commit_map + */ + struct lock_class_key jbd2_trans_commit_key;
/** * @j_fc_cleanup_callback: