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SUNRPC: Fix a server shutdown leak

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[ 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>
This commit is contained in:
Benjamin Coddington 2023-03-03 16:08:32 -05:00 committed by Greg Kroah-Hartman
parent b93ed36b31
commit 7a37203610
1 changed files with 5 additions and 1 deletions
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6
net/sunrpc/svc.c
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@ -787,6 +787,7 @@ svc_start_kthreads(struct svc_serv *serv, struct svc_pool *pool, int nrservs)
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;
@ -795,7 +796,10 @@ 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;