Re: [syzbot] Re: [syzbot] [v9fs?] WARNING in v9fs_begin_writeback

From: syzbot
Date: Fri Aug 09 2024 - 04:15:56 EST


For archival purposes, forwarding an incoming command email to
linux-kernel@xxxxxxxxxxxxxxx.

***

Subject: Re: [syzbot] [v9fs?] WARNING in v9fs_begin_writeback
Author: lizhi.xu@xxxxxxxxxxxxx

add file refconut when add fid to list

#syz test: upstream c0ecd6388360

diff --git a/fs/9p/fid.c b/fs/9p/fid.c
index de009a33e0e2..4ccd9cb74c11 100644
--- a/fs/9p/fid.c
+++ b/fs/9p/fid.c
@@ -95,6 +95,7 @@ void v9fs_open_fid_add(struct inode *inode, struct p9_fid **pfid)
struct p9_fid *fid = *pfid;

spin_lock(&inode->i_lock);
+ fget(fid->fid);
hlist_add_head(&fid->ilist, (struct hlist_head *)&inode->i_private);
spin_unlock(&inode->i_lock);