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Mon, 18 Aug 2025 11:45:22 +0000 (UTC) Received: by dhcp-27-174.brq.redhat.com (nbSMTP-1.00) for uid 1000 oleg@redhat.com; Mon, 18 Aug 2025 13:44:11 +0200 (CEST) Date: Mon, 18 Aug 2025 13:44:05 +0200 From: Oleg Nesterov To: syzbot Cc: akpm@linux-foundation.org, brauner@kernel.org, dvyukov@google.com, elver@google.com, glider@google.com, jack@suse.cz, kasan-dev@googlegroups.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, syzkaller-bugs@googlegroups.com, viro@zeniv.linux.org.uk, willy@infradead.org Subject: Re: [syzbot] [fs?] [mm?] INFO: task hung in v9fs_file_fsync Message-ID: <20250818114404.GA18626@redhat.com> References: <68a2de8f.050a0220.e29e5.0097.GAE@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <68a2de8f.050a0220.e29e5.0097.GAE@google.com> User-Agent: Mutt/1.5.24 (2015-08-30) X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 024DA180013 X-Stat-Signature: m915nmszko9deya58mrjzzxsznydmujh X-HE-Tag: 1755517535-521351 X-HE-Meta: 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 YLIp7CUF 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 08/18, syzbot wrote: > > HEAD commit: 038d61fd6422 Linux 6.16 #syz test: upstream 038d61fd6422 diff --git a/net/9p/trans_fd.c b/net/9p/trans_fd.c index 339ec4e54778..474fe67f72ac 100644 --- a/net/9p/trans_fd.c +++ b/net/9p/trans_fd.c @@ -666,7 +666,6 @@ static void p9_poll_mux(struct p9_conn *m) static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) { - __poll_t n; int err; struct p9_trans_fd *ts = client->trans; struct p9_conn *m = &ts->conn; @@ -686,13 +685,7 @@ static int p9_fd_request(struct p9_client *client, struct p9_req_t *req) list_add_tail(&req->req_list, &m->unsent_req_list); spin_unlock(&m->req_lock); - if (test_and_clear_bit(Wpending, &m->wsched)) - n = EPOLLOUT; - else - n = p9_fd_poll(m->client, NULL, NULL); - - if (n & EPOLLOUT && !test_and_set_bit(Wworksched, &m->wsched)) - schedule_work(&m->wq); + p9_poll_mux(m); return 0; }