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| author | Zhang Huan <zhhuan@gmail.com> | 2011-04-05 19:16:20 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2011-04-05 19:16:20 -0400 |
| commit | 6cba611e600ded15f642552ce6b5f7ee243bacf0 (patch) | |
| tree | 5ffde3bc5fb87bbf9693bc83a53d9212ae04f267 | |
| parent | 46e4690bbd9a4f8d9e7c4f34e34b48f703ad47e0 (diff) | |
| download | linux-6cba611e600ded15f642552ce6b5f7ee243bacf0.tar.gz linux-6cba611e600ded15f642552ce6b5f7ee243bacf0.tar.bz2 linux-6cba611e600ded15f642552ce6b5f7ee243bacf0.zip | |
jbd2: fix potential memory leak on transaction commit
There is potential memory leak of journal head in function
jbd2_journal_commit_transaction. The problem is that JBD2 will not
reclaim the journal head of commit record if error occurs or journal
is abotred.
I use the following script to reproduce this issue, on a RHEL6
system. I found it very easy to reproduce with async commit enabled.
mount /dev/sdb /mnt -o journal_checksum,journal_async_commit
touch /mnt/xxx
echo offline > /sys/block/sdb/device/state
sync
umount /mnt
rmmod ext4
rmmod jbd2
Removal of the jbd2 module will make slab complaining that
"cache `jbd2_journal_head': can't free all objects".
Signed-off-by: Zhang Huan <zhhuan@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
| -rw-r--r-- | fs/jbd2/commit.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c index fa36d7662b21..b98e4c1eecff 100644 --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -105,6 +105,8 @@ static int journal_submit_commit_record(journal_t *journal, int ret; struct timespec now = current_kernel_time(); + *cbh = NULL; + if (is_journal_aborted(journal)) return 0; @@ -806,7 +808,7 @@ wait_for_iobuf: if (err) __jbd2_journal_abort_hard(journal); } - if (!err && !is_journal_aborted(journal)) + if (cbh) err = journal_wait_on_commit_record(journal, cbh); if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_ASYNC_COMMIT) && |