diff --git a/lib/libspl/getexecname.c b/lib/libspl/getexecname.c
index 43bf39ae33..c564eed055 100644
--- a/lib/libspl/getexecname.c
+++ b/lib/libspl/getexecname.c
@@ -48,6 +48,8 @@ getexecname(void)
 			execname[rc] = '\0';
 			ptr = execname;
 		}
+	} else {
+		ptr = execname;
 	}
 
 	pthread_mutex_unlock(&mtx);
diff --git a/lib/libzpool/include/sys/zfs_context.h b/lib/libzpool/include/sys/zfs_context.h
index f05bcb84f8..5649d4762e 100644
--- a/lib/libzpool/include/sys/zfs_context.h
+++ b/lib/libzpool/include/sys/zfs_context.h
@@ -146,7 +146,11 @@ extern void vpanic(const char *, __va_list);
  * Threads
  */
 #define TS_RUN			0x00000002
+#ifdef _linux_
 #define	STACK_SIZE		8192	/* Linux x86 and amd64 */
+#else
+#define	STACK_SIZE		24576	/* Solaris */
+#endif
 
 /* in libzpool, p0 exists only to have its address taken */
 typedef struct proc {
diff --git a/lib/libzpool/kernel.c b/lib/libzpool/kernel.c
index c8642c2f82..c7bac38b8f 100644
--- a/lib/libzpool/kernel.c
+++ b/lib/libzpool/kernel.c
@@ -146,14 +146,9 @@ zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
 	      size_t len, proc_t *pp, int state, pri_t pri)
 {
 	kthread_t *kt;
-	pthread_t tid;
 	pthread_attr_t attr;
 	size_t stack;
 
-	/*
-	 * Due to a race when getting/setting the thread ID, currently only
-	 * detached threads are supported.
-	 */
 	ASSERT3S(state & ~TS_RUN, ==, 0);
 
 	kt = umem_zalloc(sizeof(kthread_t), UMEM_NOFAIL);
@@ -161,23 +156,23 @@ zk_thread_create(caddr_t stk, size_t stksize, thread_func_t func, void *arg,
 	kt->t_arg = arg;
 
 	/*
-	 * The Solaris kernel stack size in x86/x64 is 8K, so we reduce the
-	 * default stack size in userspace, for sanity checking.
+	 * The Solaris kernel stack size is 24k for x86/x86_64.
+	 * The Linux kernel stack size is 8k for x86/x86_64.
 	 *
-	 * PTHREAD_STACK_MIN is the stack required for a NULL procedure in
-	 * userspace.
-	 *
-	 * XXX: Stack size for other architectures is not being taken into
-	 * account.
+	 * We reduce the default stack size in userspace, to ensure
+	 * we observe stack overruns in user space as well as in
+	 * kernel space.  PTHREAD_STACK_MIN is the minimum stack
+	 * required for a NULL procedure in user space and is added
+	 * in to the stack requirements.
 	 */
 	stack = PTHREAD_STACK_MIN + MAX(stksize, STACK_SIZE);
 
 	VERIFY3S(pthread_attr_init(&attr), ==, 0);
 	VERIFY3S(pthread_attr_setstacksize(&attr, stack), ==, 0);
-	VERIFY3S(pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED),
-	    ==, 0);
+	VERIFY3S(pthread_attr_setguardsize(&attr, PAGESIZE), ==, 0);
 
-	VERIFY3S(pthread_create(&tid, &attr, &zk_thread_helper, kt), ==, 0);
+	VERIFY3S(pthread_create(&kt->t_tid, &attr, &zk_thread_helper, kt),
+	    ==, 0);
 
 	VERIFY3S(pthread_attr_destroy(&attr), ==, 0);
 
diff --git a/module/zfs/dmu_objset.c b/module/zfs/dmu_objset.c
index 629cba64a6..0e46edf625 100644
--- a/module/zfs/dmu_objset.c
+++ b/module/zfs/dmu_objset.c
@@ -916,7 +916,7 @@ dmu_objset_snapshot(char *fsname, char *snapname,
 		if (dst->dst_err)
 			dsl_dataset_name(ds, sn->failed);
 		zil_resume(dmu_objset_zil(os));
-		dmu_objset_rele(os, &sn);
+		dmu_objset_rele(os, sn);
 	}
 
 	if (err)
diff --git a/module/zfs/spa_config.c b/module/zfs/spa_config.c
index eed51ca664..2ffa06ff1d 100644
--- a/module/zfs/spa_config.c
+++ b/module/zfs/spa_config.c
@@ -96,7 +96,7 @@ spa_config_load(void)
 	if (kobj_get_filesize(file, &fsize) != 0)
 		goto out;
 
-	buf = kmem_alloc(fsize, KM_SLEEP);
+	buf = kmem_alloc(fsize, KM_SLEEP | KM_NODEBUG);
 
 	/*
 	 * Read the nvlist from the file.
@@ -159,7 +159,7 @@ spa_config_write(spa_config_dirent_t *dp, nvlist_t *nvl)
 	 */
 	VERIFY(nvlist_size(nvl, &buflen, NV_ENCODE_XDR) == 0);
 
-	buf = kmem_alloc(buflen, KM_SLEEP);
+	buf = kmem_alloc(buflen, KM_SLEEP | KM_NODEBUG);
 	temp = kmem_zalloc(MAXPATHLEN, KM_SLEEP);
 
 	VERIFY(nvlist_pack(nvl, &buf, &buflen, NV_ENCODE_XDR,
diff --git a/module/zfs/spa_misc.c b/module/zfs/spa_misc.c
index f759a717b9..228fc14fff 100644
--- a/module/zfs/spa_misc.c
+++ b/module/zfs/spa_misc.c
@@ -443,7 +443,7 @@ spa_add(const char *name, nvlist_t *config, const char *altroot)
 
 	ASSERT(MUTEX_HELD(&spa_namespace_lock));
 
-	spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP);
+	spa = kmem_zalloc(sizeof (spa_t), KM_SLEEP | KM_NODEBUG);
 
 	mutex_init(&spa->spa_async_lock, NULL, MUTEX_DEFAULT, NULL);
 	mutex_init(&spa->spa_errlist_lock, NULL, MUTEX_DEFAULT, NULL);
diff --git a/module/zfs/vdev_raidz.c b/module/zfs/vdev_raidz.c
index d8e0dc6ad9..b987ac40b1 100644
--- a/module/zfs/vdev_raidz.c
+++ b/module/zfs/vdev_raidz.c
@@ -1638,8 +1638,11 @@ raidz_checksum_verify(zio_t *zio)
 {
 	zio_bad_cksum_t zbc;
 	raidz_map_t *rm = zio->io_vsd;
+	int ret;
 
-	int ret = zio_checksum_error(zio, &zbc);
+	bzero(&zbc, sizeof (zio_bad_cksum_t));
+
+	ret = zio_checksum_error(zio, &zbc);
 	if (ret != 0 && zbc.zbc_injected != 0)
 		rm->rm_ecksuminjected = 1;
 
diff --git a/module/zfs/zio.c b/module/zfs/zio.c
index 5ebdf4ca6c..ab26b8ac1a 100644
--- a/module/zfs/zio.c
+++ b/module/zfs/zio.c
@@ -1052,10 +1052,7 @@ zio_taskq_dispatch(zio_t *zio, enum zio_taskq_type q, boolean_t cutinline)
 {
 	spa_t *spa = zio->io_spa;
 	zio_type_t t = zio->io_type;
-	int flags;
-
-	flags  = (cutinline ? TQ_FRONT : 0);
-	flags |= ((q == ZIO_TASKQ_INTERRUPT) ? TQ_NOSLEEP : TQ_SLEEP);
+	int flags = TQ_NOSLEEP | (cutinline ? TQ_FRONT : 0);
 
 	/*
 	 * If we're a config writer or a probe, the normal issue and
diff --git a/module/zfs/zvol.c b/module/zfs/zvol.c
index 333b3fb9d1..ffbb29251c 100644
--- a/module/zfs/zvol.c
+++ b/module/zfs/zvol.c
@@ -275,8 +275,6 @@ zvol_set_volsize(const char *name, uint64_t volsize)
 	zvol_state_t *zv;
 	dmu_object_info_t doi;
 	objset_t *os = NULL;
-	zvol_state_t state = { 0 };
-	uint64_t old_volsize = 0ULL;
 	uint64_t readonly;
 	int error;
 
@@ -284,24 +282,24 @@ zvol_set_volsize(const char *name, uint64_t volsize)
 
 	zv = zvol_find_by_name(name);
 	if (zv == NULL) {
-		error = dmu_objset_hold(name, FTAG, &os);
-		if (error)
-			goto out;
-		zv = &state;
+		error = ENXIO;
+		goto out;
 	}
 
+	error = dmu_objset_hold(name, FTAG, &os);
+	if (error)
+		goto out;
+
+	if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
+	    (error = zvol_check_volsize(volsize,doi.doi_data_block_size)) != 0)
+		goto out;
+
 	VERIFY(dsl_prop_get_integer(name, "readonly", &readonly, NULL) == 0);
 	if (readonly) {
 		error = EROFS;
 		goto out;
 	}
 
-	old_volsize = zv->zv_volsize;
-
-	if ((error = dmu_object_info(os, ZVOL_OBJ, &doi)) != 0 ||
-	    (error = zvol_check_volsize(volsize,doi.doi_data_block_size)) != 0)
-		goto out;
-
 	if (get_disk_ro(zv->zv_disk) || (zv->zv_flags & ZVOL_RDONLY)) {
 		error = EROFS;
 		goto out;