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Index: head/sys/kern/kern_cpuset.c
===================================================================
--- head/sys/kern/kern_cpuset.c
+++ head/sys/kern/kern_cpuset.c
@@ -794,14 +794,11 @@
return (EPERM);
domainset_freelist_init(&domains, 0);
domain = domainset_create(domain);
- ndomains = needed = 0;
- do {
- if (ndomains < needed) {
- domainset_freelist_add(&domains, needed - ndomains);
- ndomains = needed;
- }
+ ndomains = 0;
+
+ mtx_lock_spin(&cpuset_lock);
+ for (;;) {
root = cpuset_getroot(set);
- mtx_lock_spin(&cpuset_lock);
dset = root->cs_domain;
/*
* Verify that we have access to this set of domains.
@@ -826,7 +823,15 @@
&needed, 0);
if (error)
goto out;
- } while (ndomains < needed);
+ if (ndomains >= needed)
+ break;
+
+ /* Dropping the lock; we'll need to re-evaluate again. */
+ mtx_unlock_spin(&cpuset_lock);
+ domainset_freelist_add(&domains, needed - ndomains);
+ ndomains = needed;
+ mtx_lock_spin(&cpuset_lock);
+ }
dset = set->cs_domain;
cpuset_update_domain(set, domain, dset, &domains);
out:

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