From: Long Li <leo.lilong@huawei.com>
Date: Wed, 16 Jul 2025 01:54:07 +0000 (+0800)
Subject: [PATCH] memfs_ll: fix deadlock in truncate operation
X-Git-Tag: archive/raspbian/3.17.2-3+rpi1^2~1
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/%22/%22http:/www.example.com/cgi/%22?a=commitdiff_plain;h=c3b00452f4bdba32d73f38cff88b3b95e8ec2299;p=fuse3.git

[PATCH] memfs_ll: fix deadlock in truncate operation

Remove redundant mutex lock acquisition in the truncate() method to
prevent deadlock. The issue occurs when memfs_setattr() already holds
the mutex lock and then calls truncate(), which attempts to acquire
the same lock again.

Signed-off-by: Long Li <leo.lilong@huawei.com>

Gbp-Pq: Name memfs_ll-fix-deadlock.patch
---

diff --git a/example/memfs_ll.cc b/example/memfs_ll.cc
index 6038850..e587756 100644
--- a/example/memfs_ll.cc
+++ b/example/memfs_ll.cc
@@ -197,7 +197,6 @@ class Inode {
 
 	void truncate(off_t size)
 	{
-		std::lock_guard<std::mutex> lock(mutex);
 		std::lock_guard<std::mutex> attr_lock(attr_mutex);
 		if (size < content.size()) {
 			content.resize(size);