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