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diff -Nur a/module/zfs/vdev_disk.c b/module/zfs/vdev_disk.c
--- a/module/zfs/vdev_disk.c 2019-09-25 21:44:42.626286618 +0100
+++ b/module/zfs/vdev_disk.c 2020-01-02 10:29:56.356741395 +0000
@@ -220,7 +220,7 @@
char *envp[] = { NULL };
argv[2] = kmem_asprintf(SET_SCHEDULER_CMD, device, elevator);
- error = call_usermodehelper(argv[0], argv, envp, UMH_NO_WAIT);
+ error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_EXEC);
strfree(argv[2]);
#endif /* HAVE_ELEVATOR_CHANGE */
if (error) {
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