linux-kernel - Re: [syzbot] [ext4?] INFO: task hung in ext4_quota

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Date: Fri,  5 Jan 2024 22:23:06 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+a43d4f48b8397d0e41a9@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [ext4?] INFO: task hung in ext4_quota_write

please test task hung in ext4_quota_write

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git f5837722ffec

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index c5fcf377ab1f..cd9531db8472 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -7248,6 +7248,10 @@ static ssize_t ext4_quota_write(struct super_block *sb, int type,
 		brelse(bh);
 		return err;
 	}
+	if (test_bit(BH_Lock, &bh->b_state)) {
+		brelse(bh);
+		return -EIO;
+	}
 	lock_buffer(bh);
 	memcpy(bh->b_data+offset, data, len);
 	flush_dcache_page(bh->b_page);