If call to ext4_init_io_end() is failed under memory pressure,
ext4_writepage() calls redirty_page_for_writepage() but left the page locked.
That leads to a deadlock since it is expected the page is unlocked after writepage().
Found by Linux File System Verification project (linuxtesting.org).
Signed-off-by: Alexey Khoroshilov <khoroshilov@xxxxxxxxx>
---
fs/ext4/inode.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index aeca439..c6bc999 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -2250,6 +2250,7 @@ static int ext4_writepage(struct page *page,
io_submit.io_end = ext4_init_io_end(inode, GFP_NOFS);
if (!io_submit.io_end) {
redirty_page_for_writepage(wbc, page);
+ unlock_page(page);
return -ENOMEM;
}
ret = ext4_bio_write_page(&io_submit, page, len, wbc);
--
1.7.9.5
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