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net/rds: do not initialize transports after rds_init() failed

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rds, rds_rdma and rds_tcp each have their own module_init().  When they
are built in, those run in link order, so rds_init() goes first, but
do_initcalls() does not stop when it fails.  The transports then
initialize against a core that has already been torn down: rds_wq has
been destroyed, yet rds_ib_dev_put(), rds_ib_unregister_client() and
rds_tcp_accept_work() still queue onto or flush it, and
rds_trans_register() hands the transports to a core whose socket
family may never have been registered.

This was seen with CONFIG_SYSCTL=n, where rds_sysctl_init() failed and
rds_ib_init()'s error path then flushed the freed rds_wq [1], but any
rds_init() failure after rds_threads_init() has the same effect.

Record whether rds_init() succeeded and have rds_rdma_init() and
rds_tcp_init() bail out with -ENODEV otherwise.  Modular builds are
unaffected: the transports need symbols exported by rds.ko, so they
cannot be loaded unless rds_init() succeeded.

[1] https://lore.kernel.org/oe-lkp/202610190310.9737b2e3-lkp@intel.com
Fixes: 55b7ed0b58 ("RDS: Common RDMA transport code")
Fixes: 70041088e3 ("RDS: Add TCP transport to RDS")
Suggested-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Allison Henderson <achender@kernel.org>
Link: https://patch.msgid.link/20261021195837.142802-3-achender@kernel.org
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Allison Henderson 2026-10-21 12:58:37 -07:00 committed by Paolo Abeni
parent fbea154a86
commit ffbbc315b8
4 changed files with 21 additions and 0 deletions
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14
net/rds/af_rds.c
View File

@ -925,8 +925,11 @@ static void rds6_sock_info(struct socket *sock, unsigned int len,
}
#endif
static bool rds_initialized;
static void rds_exit(void)
{
rds_initialized = false;
sock_unregister(rds_family_ops.family);
proto_unregister(&rds_proto);
rds_conn_exit();
@ -947,6 +950,16 @@ module_exit(rds_exit);
u32 rds_gen_num;
/* When RDS is built in, a failed rds_init() does not stop the rds_rdma
* and rds_tcp initcalls from running against a core that has already
* been torn down (rds_wq in particular). Let them bail out early.
*/
bool rds_is_initialized(void)
{
return rds_initialized;
}
EXPORT_SYMBOL_GPL(rds_is_initialized);
static int __init rds_init(void)
{
int ret;
@ -983,6 +996,7 @@ static int __init rds_init(void)
rds_info_register_func(RDS6_INFO_SOCKETS, rds6_sock_info);
rds_info_register_func(RDS6_INFO_RECV_MESSAGES, rds6_sock_inc_info);
#endif
rds_initialized = true;
goto out;

3
net/rds/rdma_transport.c
View File

@ -336,6 +336,9 @@ static int __init rds_rdma_init(void)
{
int ret;
if (!rds_is_initialized())
return -ENODEV;
ret = rds_ib_init();
if (ret)
goto out;

1
net/rds/rds.h
View File

@ -1042,6 +1042,7 @@ extern unsigned int rds_sysctl_trace_level;
int rds_threads_init(void);
void rds_threads_exit(void);
extern struct workqueue_struct *rds_wq;
bool rds_is_initialized(void);
void rds_queue_reconnect(struct rds_conn_path *cp);
void rds_connect_worker(struct work_struct *);
void rds_shutdown_worker(struct work_struct *);

3
net/rds/tcp.c
View File

@ -815,6 +815,9 @@ static int __init rds_tcp_init(void)
{
int ret;
if (!rds_is_initialized())
return -ENODEV;
rds_tcp_conn_slab = KMEM_CACHE(rds_tcp_connection, 0);
if (!rds_tcp_conn_slab) {
ret = -ENOMEM;