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authorChandan Rajendra <chandan@linux.ibm.com>2019-08-11 16:29:41 -0400
committerTheodore Ts'o <tytso@mit.edu>2019-08-11 16:29:41 -0400
commit547b9ad698b434eadca46319cb47e5875b55ef03 (patch)
tree5f4021e39b9df5468089a13f7cdd80357025ee14 /fs/jbd2
parent991f52306ab8b5d8427f6f953162b5ab92e88e51 (diff)
downloadlinux-547b9ad698b434eadca46319cb47e5875b55ef03.tar.bz2
jbd2: flush_descriptor(): Do not decrease buffer head's ref count
When executing generic/388 on a ppc64le machine, we notice the following call trace, VFS: brelse: Trying to free free buffer WARNING: CPU: 0 PID: 6637 at /root/repos/linux/fs/buffer.c:1195 __brelse+0x84/0xc0 Call Trace: __brelse+0x80/0xc0 (unreliable) invalidate_bh_lru+0x78/0xc0 on_each_cpu_mask+0xa8/0x130 on_each_cpu_cond_mask+0x130/0x170 invalidate_bh_lrus+0x44/0x60 invalidate_bdev+0x38/0x70 ext4_put_super+0x294/0x560 generic_shutdown_super+0xb0/0x170 kill_block_super+0x38/0xb0 deactivate_locked_super+0xa4/0xf0 cleanup_mnt+0x164/0x1d0 task_work_run+0x110/0x160 do_notify_resume+0x414/0x460 ret_from_except_lite+0x70/0x74 The warning happens because flush_descriptor() drops bh reference it does not own. The bh reference acquired by jbd2_journal_get_descriptor_buffer() is owned by the log_bufs list and gets released when this list is processed. The reference for doing IO is only acquired in write_dirty_buffer() later in flush_descriptor(). Reported-by: Harish Sriram <harish@linux.ibm.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Chandan Rajendra <chandan@linux.ibm.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/jbd2')
-rw-r--r--fs/jbd2/revoke.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/fs/jbd2/revoke.c b/fs/jbd2/revoke.c
index 69b9bc329964..f08073d7bbf5 100644
--- a/fs/jbd2/revoke.c
+++ b/fs/jbd2/revoke.c
@@ -638,10 +638,8 @@ static void flush_descriptor(journal_t *journal,
{
jbd2_journal_revoke_header_t *header;
- if (is_journal_aborted(journal)) {
- put_bh(descriptor);
+ if (is_journal_aborted(journal))
return;
- }
header = (jbd2_journal_revoke_header_t *)descriptor->b_data;
header->r_count = cpu_to_be32(offset);