linux-kernel - [PATCH] [fuse] alloc_page nofs avoid deadlock

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Message-Id: <20210603124105.29052-1-chenguanyou@xiaomi.com>
Date:   Thu,  3 Jun 2021 20:41:05 +0800
From:   chenguanyou <chenguanyou9338@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     akpm@...ux-foundation.org, keescook@...omium.org, mhocko@...e.com,
        lukas.bulwahn@...il.com, vbabka@...e.cz, gpiccoli@...onical.com,
        chenguanyou <chenguanyou@...omi.com>
Subject: [PATCH] [fuse] alloc_page nofs avoid deadlock

ABA deadlock

PID: 17172 TASK: ffffffc0c162c000 CPU: 6 COMMAND: "Thread-21"

PID: 9652 TASK: ffffffc0c9ce0000 CPU: 4 COMMAND: "kworker/u16:8"

Signed-off-by: chenguanyou <chenguanyou@...omi.com>
---
 fs/fuse/dev.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index c0fee830a34e..d36125ff0405 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -721,7 +721,7 @@ static int fuse_copy_fill(struct fuse_copy_state *cs)
 			if (cs->nr_segs >= cs->pipe->max_usage)
 				return -EIO;
 
-			page = alloc_page(GFP_HIGHUSER);
+			page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
 			if (!page)
 				return -ENOMEM;
 
-- 
2.17.1