diff --git a/nightly/conf/nightly.conf b/nightly/conf/nightly.conf
index 0dc233f4b..4f123aa3e 100644
--- a/nightly/conf/nightly.conf
+++ b/nightly/conf/nightly.conf
@@ -3,29 +3,29 @@
 ABT_DETAILS="x86_64"
 ABT_JOBS=5
 ABT_KERNELS="  \
-4.20           \
-4.19.13-nc     \
+4.20.2         \
+4.19.15-nc     \
 4.18.18-nc     \
 4.17.18-nc     \
 4.16.18-nc     \
 4.15.18-nc     \
-4.14.85-nc     \
+4.14.93-nc     \
 4.13.16-nc     \
 4.12.14-nc     \
 4.11.12-nc     \
 4.10.17-nc     \
-4.9.142-nc     \
+4.9.150-nc     \
 4.8.17-nc      \
 4.7.10-nc      \
 4.6.7-nc       \
 4.5.7-nc       \
-4.4.166-nc     \
+4.4.170-nc     \
 4.3.6-nc       \
 4.2.8-nc       \
 4.1.52-nc      \
 4.0.9-nc       \
 3.19.8-nc      \
-3.18.128-nc    \
+3.18.132-nc    \
 3.17.8-nc      \
 3.16.60-nc     \
 3.15.10-nc     \
@@ -56,5 +56,5 @@ ABT_KERNELS="  \
 2.6.31.14-nc   \
 2.6.30.10-nc   \
 2.6.29.6-nc    \
-2.6.27.62-nc   \
+2.6.27.52-nc   \
 "
diff --git a/scripts/run-regression-tests b/scripts/run-regression-tests
index fa37fdc0a..1105bd01d 100755
--- a/scripts/run-regression-tests
+++ b/scripts/run-regression-tests
@@ -647,7 +647,10 @@ do
   patchdir="patchdir-${kv}"
   k="${kv}"
 
-  download_kernel "$k" || continue
+  if ! download_kernel "$k"; then
+    echo "Downloading kernel version $k failed"
+    continue
+  fi
   generate_kernel_patch "$k" "${generate_kernel_patch_options}" || continue
   (
       cd "${outputdir}" &&
diff --git a/scst/include/backport.h b/scst/include/backport.h
index b11525117..3348bd080 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -119,11 +119,25 @@ static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
 }
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 32)
+/* See also commit ac481c20ef8f ("block: Topology ioctls") # v2.6.32 */
+static inline int bdev_io_opt(struct block_device *bdev)
+{
+	return 0;
+}
+#endif
+
 /* <linux/blk-mq.h> */
 
 static inline unsigned int scst_blk_rq_cpu(struct request *rq)
 {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0)
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 28)
+	/*
+	 * See also commit c7c22e4d5c1f ("block: add support for IO CPU
+	 * affinity") # v2.6.28.
+	 */
+	return 0;
+#elif LINUX_VERSION_CODE < KERNEL_VERSION(4, 21, 0)
 	return rq->cpu;
 #else
 	return blk_mq_rq_cpu(rq);
@@ -420,6 +434,33 @@ static inline ssize_t call_write_iter(struct file *file, struct kiocb *kio,
 }
 #endif
 
+/* See also commit bdd1d2d3d251 ("fs: fix kernel_read prototype") # v4.14 */
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 14, 0)
+static inline ssize_t
+kernel_read_backport(struct file *file, void *buf, size_t count, loff_t *pos)
+{
+	return kernel_read(file, *pos, buf, count);
+}
+
+#define kernel_read(file, buf, count, pos)			\
+	kernel_read_backport((file), (buf), (count), (pos))
+
+/*
+ * See also commit 7bb307e894d5 ("export kernel_write(), convert open-coded
+ * instances") # v3.10.
+ */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
+static inline ssize_t
+kernel_write_backport(struct file *file, void *buf, size_t count, loff_t *pos)
+{
+	return kernel_write(file, *pos, buf, count);
+}
+
+#define kernel_write(file, buf, count, pos)			\
+	kernel_write_backport((file), (buf), (count), (pos))
+#endif
+#endif
+
 /* <linux/iocontext.h> */
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25) || \
 	LINUX_VERSION_CODE >= KERNEL_VERSION(4, 21, 0)
@@ -963,7 +1004,7 @@ struct t10_pi_tuple {
 #undef DEFINE_TIMER
 #define DEFINE_TIMER(_name, _function)					\
 	struct timer_list _name = TIMER_INITIALIZER(			\
-		(void (*)(unsigned long))(_function), 0,		\
+		(void (*)(unsigned long))(unsigned long)(_function), 0,	\
 		(unsigned long)&(_name))
 #endif
 
diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index 3931a87c9..e4647e3c6 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -25,6 +25,7 @@
 #ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
 #endif
+#include <linux/wait.h>
 #include <linux/aio.h>
 #include <linux/file.h>
 #include <linux/fs.h>
diff --git a/srpt/src/ib_srpt.c b/srpt/src/ib_srpt.c
index bfc552285..d4d5f1e53 100644
--- a/srpt/src/ib_srpt.c
+++ b/srpt/src/ib_srpt.c
@@ -156,7 +156,11 @@ module_param(use_node_guid_in_target_name, bool, 0444);
 MODULE_PARM_DESC(use_node_guid_in_target_name,
 		 "Use HCA node GUID as SCST target name.");
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 10, 0)
+static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
+#else
 static int srpt_get_u64_x(char *buffer, const struct kernel_param *kp)
+#endif
 {
 	return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
 }
@@ -1094,6 +1098,7 @@ static int srpt_zerolength_write(struct srpt_rdma_ch *ch)
 
 static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
 {
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
 	/*
 	 * The pointer computations below will only be compiled correctly
 	 * if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
@@ -1101,6 +1106,7 @@ static inline void *srpt_get_desc_buf(struct srp_cmd *srp_cmd)
 	 */
 	BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0) &&
 		     !__same_type(srp_cmd->add_data[0], (u8)0));
+#endif
 
 	/*
 	 * According to the SRP spec, the lower two bits of the 'ADDITIONAL