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| author | Sowmini Varadhan <sowmini.varadhan@oracle.com> | 2017-07-17 02:43:46 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-07-17 05:07:35 +0300 |
| commit | aed20a53a7d91e45c6a8cb8920c77aaaa88f76ee (patch) | |
| tree | 78bdb7167413d66c08f14ec1056cffd85fa0bc7d /net/rds/threads.c | |
| parent | ce3dbe29749e3a3ef25540b394a68215e3113462 (diff) | |
| download | linux-aed20a53a7d91e45c6a8cb8920c77aaaa88f76ee.tar.xz | |
rds: cancel send/recv work before queuing connection shutdown
We could end up executing rds_conn_shutdown before the rds_recv_worker
thread, then rds_conn_shutdown -> rds_tcp_conn_shutdown can do a
sock_release and set sock->sk to null, which may interleave in bad
ways with rds_recv_worker, e.g., it could result in:
"BUG: unable to handle kernel NULL pointer dereference at 0000000000000078"
[ffff881769f6fd70] release_sock at ffffffff815f337b
[ffff881769f6fd90] rds_tcp_recv at ffffffffa043c888 [rds_tcp]
[ffff881769f6fdb0] rds_recv_worker at ffffffffa04a4810 [rds]
[ffff881769f6fde0] process_one_work at ffffffff810a14c1
[ffff881769f6fe40] worker_thread at ffffffff810a1940
[ffff881769f6fec0] kthread at ffffffff810a6b1e
Also, do not enqueue any new shutdown workq items when the connection is
shutting down (this may happen for rds-tcp in softirq mode, if a FIN
or CLOSE is received while the modules is in the middle of an unload)
Signed-off-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/rds/threads.c')
| -rw-r--r-- | net/rds/threads.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/net/rds/threads.c b/net/rds/threads.c index 2852bc1d37d4..f121daa402c8 100644 --- a/net/rds/threads.c +++ b/net/rds/threads.c @@ -78,7 +78,7 @@ void rds_connect_path_complete(struct rds_conn_path *cp, int curr) "current state is %d\n", __func__, atomic_read(&cp->cp_state)); - rds_conn_path_drop(cp); + rds_conn_path_drop(cp, false); return; } |