linux-kernel - Forwarded: Re: [syzbot] [netfs?] INFO: task hung in vfs

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Message-ID: <68ccb1f2.a00a0220.37dadf.0010.GAE@google.com>
Date: Thu, 18 Sep 2025 18:29:22 -0700
From: syzbot <syzbot+3815dce0acab6c55984e@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org
Subject: Forwarded: Re: [syzbot] [netfs?] INFO: task hung in vfs_utimes (3)

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***

Subject: Re: [syzbot] [netfs?] INFO: task hung in vfs_utimes (3)
Author: lizhi.xu@...driver.com

#syz test

diff --git a/fs/pipe.c b/fs/pipe.c
index 731622d0738d..ca7a6746f8ef 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -356,8 +356,8 @@ anon_pipe_read(struct kiocb *iocb, struct iov_iter *to)
 				buf->len = 0;
 			}
 
+			wake_writer |= pipe_full(head, tail, pipe->max_usage);
 			if (!buf->len) {
-				wake_writer |= pipe_full(head, tail, pipe->max_usage);
 				tail = pipe_update_tail(pipe, buf, tail);
 			}
 			total_len -= chars;