linux-kernel - Re: [syzbot] [fs?] WARNING: bad unlock balance in namespace

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Message-ID: <tencent_97B86EC86EF2CC8B67CDC6C3D2D9C6754906@qq.com>
Date: Wed, 24 Sep 2025 18:41:00 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+0d671007a95cd2835e05@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [fs?] WARNING: bad unlock balance in namespace_unlock

#syz test

diff --git a/fs/namespace.c b/fs/namespace.c
index ac1aedafe05e..c22febeda1ac 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -4134,7 +4134,6 @@ struct mnt_namespace *copy_mnt_ns(u64 flags, struct mnt_namespace *ns,
 	new = copy_tree(old, old->mnt.mnt_root, copy_flags);
 	if (IS_ERR(new)) {
 		emptied_ns = new_ns;
-		namespace_unlock();
 		return ERR_CAST(new);
 	}
 	if (user_ns != ns->user_ns) {
diff --git a/kernel/fork.c b/kernel/fork.c
index e9a7fb5c3e49..a0b8eeeb1d27 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -2349,7 +2349,7 @@ __latent_entropy struct task_struct *copy_process(
 	if (need_futex_hash_allocate_default(clone_flags)) {
 		retval = futex_hash_allocate_default();
 		if (retval)
-			goto bad_fork_core_free;
+			goto bad_fork_cancel_cgroup;
 		/*
 		 * If we fail beyond this point we don't free the allocated
 		 * futex hash map. We assume that another thread will be created