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| author | Benjamin Coddington <bcodding@redhat.com> | 2023-03-04 00:08:32 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-03-17 10:45:12 +0300 |
| commit | ce7dd61e004002bc1c48d1ca47c887f3f3cc7370 (patch) | |
| tree | e890825fd83b908cd1c797355ee1cfa84a69e6ba | |
| parent | e1b8342a85289d0d3411744c4fc1e0fc46fc9d5c (diff) | |
| download | linux-ce7dd61e004002bc1c48d1ca47c887f3f3cc7370.tar.xz | |
SUNRPC: Fix a server shutdown leak
[ Upstream commit 9ca6705d9d609441d34f8b853e1e4a6369b3b171 ]
Fix a race where kthread_stop() may prevent the threadfn from ever getting
called. If that happens the svc_rqst will not be cleaned up.
Fixes: ed6473ddc704 ("NFSv4: Fix callback server shutdown")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
| -rw-r--r-- | net/sunrpc/svc.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c index d38788cd9433..af657a482ad2 100644 --- a/net/sunrpc/svc.c +++ b/net/sunrpc/svc.c @@ -800,6 +800,7 @@ EXPORT_SYMBOL_GPL(svc_set_num_threads); static int svc_stop_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) { + struct svc_rqst *rqstp; struct task_struct *task; unsigned int state = serv->sv_nrthreads-1; @@ -808,7 +809,10 @@ svc_stop_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs) task = choose_victim(serv, pool, &state); if (task == NULL) break; - kthread_stop(task); + rqstp = kthread_data(task); + /* Did we lose a race to svo_function threadfn? */ + if (kthread_stop(task) == -EINTR) + svc_exit_thread(rqstp); nrservs++; } while (nrservs < 0); return 0; |