From: Luis Henriques (SUSE) <luis.henriques@xxxxxxxxx> commit 972090651ee15e51abfb2160e986fa050cfc7a40 upstream. Function __jbd2_log_wait_for_space() assumes that '0' is not a valid value for transaction IDs, which is incorrect. Don't assume that and invoke jbd2_log_wait_commit() if the journal had a committing transaction instead. Signed-off-by: Luis Henriques (SUSE) <luis.henriques@xxxxxxxxx> Reviewed-by: Jan Kara <jack@xxxxxxx> Link: https://patch.msgid.link/20240724161119.13448-3-luis.henriques@xxxxxxxxx Signed-off-by: Theodore Ts'o <tytso@xxxxxxx> Cc: stable@xxxxxxxxxx Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/jbd2/checkpoint.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) --- a/fs/jbd2/checkpoint.c +++ b/fs/jbd2/checkpoint.c @@ -137,9 +137,12 @@ void __jbd2_log_wait_for_space(journal_t if (space_left < nblocks) { int chkpt = journal->j_checkpoint_transactions != NULL; tid_t tid = 0; + bool has_transaction = false; - if (journal->j_committing_transaction) + if (journal->j_committing_transaction) { tid = journal->j_committing_transaction->t_tid; + has_transaction = true; + } spin_unlock(&journal->j_list_lock); write_unlock(&journal->j_state_lock); if (chkpt) { @@ -147,7 +150,7 @@ void __jbd2_log_wait_for_space(journal_t } else if (jbd2_cleanup_journal_tail(journal) == 0) { /* We were able to recover space; yay! */ ; - } else if (tid) { + } else if (has_transaction) { /* * jbd2_journal_commit_transaction() may want * to take the checkpoint_mutex if JBD2_FLUSHED Patches currently in stable-queue which might be from luis.henriques@xxxxxxxxx are queue-4.19/ext4-fix-incorrect-tid-assumption-in-ext4_wait_for_tail_page_commit.patch queue-4.19/ext4-fix-incorrect-tid-assumption-in-__jbd2_log_wait_for_space.patch
