p9_read_work() doesn't set Rworksched and doesn't do schedule_work(m->rq)
if list_empty(&m->req_list).
However, if the pipe is full, we need to read more data and this used to
work prior to commit aaec5a95d59615 ("pipe_read: don't wake up the writer
if the pipe is still full").
p9_read_work() does p9_fd_read() -> ... -> anon_pipe_read() which (before
the commit above) triggered the unnecessary wakeup. This wakeup calls
p9_pollwake() which kicks p9_poll_workfn() -> p9_poll_mux(), p9_poll_mux()
will notice EPOLLIN and schedule_work(&m->rq).
This no longer happens after the optimization above, change p9_fd_request()
to use p9_poll_mux() instead of only checking for EPOLLOUT.
Reported-by: syzbot+d1b5dace43896bc386c3@xxxxxxxxxxxxxxxxxxxxxxxxx
Tested-by: syzbot+d1b5dace43896bc386c3@xxxxxxxxxxxxxxxxxxxxxxxxx
Closes: https://lore.kernel.org/all/68a2de8f.050a0220.e29e5.0097.GAE@xxxxxxxxxx/
Link: https://lore.kernel.org/all/67dedd2f.050a0220.31a16b.003f.GAE@xxxxxxxxxx/
Co-developed-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Signed-off-by: K Prateek Nayak <kprateek.nayak@xxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
net/9p/trans_fd.c | 9 +--------
1 file changed, 1 insertion(+), 8 deletions(-)
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;
}
--
2.25.1.362.g51ebf55
