linux-kernel - Re: [syzbot] [nilfs?] possible deadlock in nilfs_dirty

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Message-Id: <20241020.122752.543927907848385586.konishi.ryusuke@gmail.com>
Date: Sun, 20 Oct 2024 12:27:52 +0900 (JST)
From: Ryusuke Konishi <konishi.ryusuke@...il.com>
To: syzbot+9ef37ac20608f4836256@...kaller.appspotmail.com
Cc: syzkaller-bugs@...glegroups.com, linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [nilfs?] possible deadlock in nilfs_dirty_inode (4)


drop __GFP_FS for symlinks

#syz test

diff --git a/fs/nilfs2/namei.c b/fs/nilfs2/namei.c
index c950139db6ef..bcd7d1288e2c 100644
--- a/fs/nilfs2/namei.c
+++ b/fs/nilfs2/namei.c
@@ -149,6 +149,9 @@ static int nilfs_symlink(struct mnt_idmap *idmap, struct inode *dir,
 	/* slow symlink */
 	inode->i_op = &nilfs_symlink_inode_operations;
 	inode_nohighmem(inode);
+	mapping_set_gfp_mask(inode->i_mapping,
+			     mapping_gfp_constraint(inode->i_mapping,
+						    ~__GFP_FS));
 	inode->i_mapping->a_ops = &nilfs_aops;
 	err = page_symlink(inode, symname, l);
 	if (err)