linux-kernel - Re: [syzbot] Re: [syzbot] [nfs?] [net?] possible deadlock in rpc_close

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Message-ID: <68664bdf.a70a0220.5d25f.0863.GAE@google.com>
Date: Thu, 03 Jul 2025 02:22:39 -0700
From: syzbot <syzbot+169de184e9defe7fe709@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Re: [syzbot] Re: [syzbot] [nfs?] [net?] possible deadlock in rpc_close_pipes

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Subject: Re: [syzbot] [nfs?] [net?] possible deadlock in rpc_close_pipes
Author: lizhi.xu@...driver.com

#syz test

diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index 0bd1df2ebb47..e30270e5883a 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -175,7 +175,7 @@ rpc_close_pipes(struct dentry *dentry)
 	int need_release;
 	LIST_HEAD(free_list);
 
-	inode_lock(inode);
+	inode_lock_nested(inode, I_MUTEX_CHILD);
 	spin_lock(&pipe->lock);
 	need_release = pipe->nreaders != 0 || pipe->nwriters != 0;
 	pipe->nreaders = 0;