Author: rmacklem
Date: Mon Jul 30 19:23:52 2018
New Revision: 336927
URL: https://svnweb.freebsd.org/changeset/base/336927
Log:
MFC: r335866
Fix the server side krpc so that the kernel nfsd threads terminate.
Occationally the kernel nfsd threads would not terminate when a SIGKILL
was posted for the kernel process (called nfsd (slave)). When this occurred,
the thread associated with the process (called "ismaster") had returned from
svc_run_internal() and was sleeping waiting for the other threads to
terminate.
The other threads (created by kthread_start()) were still in
svc_run_internal()
handling NFS RPCs.
The only way this could occur is for the "ismaster" thread to return from
svc_run_internal() without having called svc_exit().
There was only one place in the code where this could happen and this patch
stops that from happening.
Since the problem is intermittent, I cannot be sure if this has fixed the
problem, but I have not seen an occurrence of the problem with this patch
applied.
Modified:
stable/11/sys/rpc/svc.c
Directory Properties:
stable/11/ (props changed)
Modified: stable/11/sys/rpc/svc.c
==============================================================================
--- stable/11/sys/rpc/svc.c Mon Jul 30 18:29:46 2018 (r336926)
+++ stable/11/sys/rpc/svc.c Mon Jul 30 19:23:52 2018 (r336927)
@@ -1183,7 +1183,8 @@ svc_run_internal(SVCGROUP *grp, bool_t ismaster)
/*
* Enforce maxthreads count.
*/
- if (grp->sg_threadcount > grp->sg_maxthreads)
+ if (!ismaster && grp->sg_threadcount >
+ grp->sg_maxthreads)
break;
/*
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