diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7a1b267..59f9a3b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -11,6 +11,17 @@
 - Parameter `--docker-timeout` may also be set in the artifact
   configuration file.
 
+- Preload modules before inserting module or run exploit. Modules can
+  be specified by git repository path in the `repo` parameter of
+  section `[[preload]]`. Also, there is a `path` parameter for local
+  projects. Note that `repo` is using a cache that uses last commit
+  hash to check is project needs to be rebuilt, so it's not suitable
+  for local development (except if you will commit each time before
+  run out-of-tree).
+
+- Flag `--disable-preload` to ignore `[[preload]]` section of
+  configuration file.
+
 ## [1.3.0] 2020-05-30
 
 ### Added
@@ -169,7 +180,7 @@
 - Temporary files is moved to `~/.out-of-tree/tmp/` to avoid docker
   mounting issues on some systems.
 
-## [0.2.0] - 2019-12-01
+## [0.2.0] - 2018-12-01
 
 The main purpose of the release is to simplify installation.
 
@@ -191,7 +202,7 @@ The main purpose of the release is to simplify installation.
 
 - No warning anymore if test.sh is not exists.
 
-## [0.1.0] - 2019-11-20
+## [0.1.0] - 2018-11-20
 
 Initial release that was never tagged.
 
diff --git a/config/config.go b/config/config.go
index a510db0..c7dbef4 100644
--- a/config/config.go
+++ b/config/config.go
@@ -102,6 +102,12 @@ func (d Duration) MarshalTOML() (data []byte, err error) {
 	return
 }
 
+type PreloadModule struct {
+	Repo             string
+	Path             string
+	TimeoutAfterLoad Duration
+}
+
 // Artifact is for .out-of-tree.toml
 type Artifact struct {
 	Name             string
@@ -125,6 +131,8 @@ type Artifact struct {
 		DisableKaslr bool
 		DisableKpti  bool
 	}
+
+	Preload []PreloadModule
 }
 
 func (ka Artifact) checkSupport(ki KernelInfo, km KernelMask) (
diff --git a/debug.go b/debug.go
index 65fefa0..af25865 100644
--- a/debug.go
+++ b/debug.go
@@ -179,6 +179,12 @@ func debugHandler(kcfg config.KernelConfig, workPath, kernRegex, gdb string,
 	}
 	defer os.RemoveAll(tmp)
 
+	err = preloadModules(q, ka, ki, dockerTimeout)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
 	outFile, output, err := build(tmp, ka, ki, dockerTimeout)
 	if err != nil {
 		log.Println(err, output)
diff --git a/examples/preload/.out-of-tree.toml b/examples/preload/.out-of-tree.toml
new file mode 100644
index 0000000..f7875af
--- /dev/null
+++ b/examples/preload/.out-of-tree.toml
@@ -0,0 +1,12 @@
+name = "out-of-tree preload"
+type = "module"
+
+[[supported_kernels]]
+distro_type = "Ubuntu"
+distro_release = "18.04"
+release_mask = ".*"
+
+[[preload]]
+repo = "https://github.com/jollheef/lkrg"
+#path = "/local/path/to/lkrg"
+timeout_after_load = "1s"
diff --git a/examples/preload/Makefile b/examples/preload/Makefile
new file mode 100644
index 0000000..a3b9d7d
--- /dev/null
+++ b/examples/preload/Makefile
@@ -0,0 +1,11 @@
+KERNEL := /lib/modules/$(shell uname -r)/build
+TARGET := module
+
+obj-m += $(TARGET).o
+$(TARGET)-objs = module.o
+
+all:
+	make -C $(KERNEL) M=$(PWD) modules
+
+clean:
+	make -C $(KERNEL) M=$(PWD) clean
diff --git a/examples/preload/README.md b/examples/preload/README.md
new file mode 100644
index 0000000..ae94611
--- /dev/null
+++ b/examples/preload/README.md
@@ -0,0 +1,5 @@
+# out-of-tree kernel module preload example
+
+See .out-of-tree.toml
+
+Note that it should fail to insert module if lkrg is enabled in the preload list.
diff --git a/examples/preload/module.c b/examples/preload/module.c
new file mode 100644
index 0000000..0fc718b
--- /dev/null
+++ b/examples/preload/module.c
@@ -0,0 +1,17 @@
+#include <linux/module.h>
+#include <linux/slab.h>
+
+int init_module(void)
+{
+	char *argv[] = { "/bin/sh", "--help", NULL };
+	char *envp[] = { NULL };
+
+	/* trigger lkrg */
+	return call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
+}
+
+void cleanup_module(void)
+{
+}
+
+MODULE_LICENSE("GPL");
diff --git a/gen.go b/gen.go
index 54baddf..c774155 100644
--- a/gen.go
+++ b/gen.go
@@ -22,6 +22,9 @@ func genConfig(at config.ArtifactType) (err error) {
 		DistroRelease: "18.04",
 		ReleaseMask:   ".*",
 	})
+	a.Preload = append(a.Preload, config.PreloadModule{
+		Repo: "Repo name (e.g. https://github.com/jollheef/lkrg)",
+	})
 
 	buf, err := toml.Marshal(&a)
 	if err != nil {
diff --git a/go.mod b/go.mod
index a255f02..406d160 100644
--- a/go.mod
+++ b/go.mod
@@ -9,6 +9,7 @@ replace code.dumpstack.io/tools/out-of-tree/config => ./config
 require (
 	github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc // indirect
 	github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf // indirect
+	github.com/go-git/go-git/v5 v5.1.0
 	github.com/kylelemons/godebug v1.1.0 // indirect
 	github.com/mattn/go-runewidth v0.0.4 // indirect
 	github.com/mattn/go-sqlite3 v1.11.0
@@ -20,7 +21,7 @@ require (
 	github.com/remeh/sizedwaitgroup v0.0.0-20180822144253-5e7302b12cce
 	github.com/stretchr/testify v1.5.1 // indirect
 	github.com/zcalusic/sysinfo v0.0.0-20190429151633-fbadb57345c2
-	golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5
+	golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073
 	gopkg.in/alecthomas/kingpin.v2 v2.2.6
 	gopkg.in/logrusorgru/aurora.v2 v2.0.0-20190417123914-21d75270181e
 )
diff --git a/go.sum b/go.sum
index 2e89635..3391765 100644
--- a/go.sum
+++ b/go.sum
@@ -1,21 +1,54 @@
 bou.ke/monkey v1.0.1 h1:zEMLInw9xvNakzUUPjfS4Ds6jYPqCFx3m7bRmG5NH2U=
 bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg=
+github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc h1:cAKDfWh5VpdgMhJosfJnn5/FoN2SRZ4p7fJNX58YPaU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf h1:qet1QNfXsQxTZqLG4oE62mJzwPIB8+Tee4RNCL9ulrY=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
+github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
+github.com/armon/go-socks5 v0.0.0-20160902184237-e75332964ef5/go.mod h1:wHh0iHkYZB8zMSxRWpUBQtwG5a7fFgvEO+odwuTv2gs=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/emirpasic/gods v1.12.0 h1:QAUIPSaCu4G+POclxeqb3F+WPpdKqFGlw36+yOzGlrg=
+github.com/emirpasic/gods v1.12.0/go.mod h1:YfzfFFoVP/catgzJb4IKIqXjX78Ha8FMSDh3ymbK86o=
+github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI435gkrCt3MPfRiAkVrwSbHsst4LCFVfpJc=
+github.com/gliderlabs/ssh v0.2.2/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
+github.com/go-git/gcfg v1.5.0 h1:Q5ViNfGF8zFgyJWPqYwA7qGFoMTEiBmdlkcfRmpIMa4=
+github.com/go-git/gcfg v1.5.0/go.mod h1:5m20vg6GwYabIxaOonVkTdrILxQMpEShl1xiMF4ua+E=
+github.com/go-git/go-billy/v5 v5.0.0 h1:7NQHvd9FVid8VL4qVUMm8XifBK+2xCoZ2lSk0agRrHM=
+github.com/go-git/go-billy/v5 v5.0.0/go.mod h1:pmpqyWchKfYfrkb/UVH4otLvyi/5gJlGI4Hb3ZqZ3W0=
+github.com/go-git/go-git v1.0.0 h1:YcN9iDGDoXuIw0vHls6rINwV416HYa0EB2X+RBsyYp4=
+github.com/go-git/go-git v4.7.0+incompatible h1:+W9rgGY4DOKKdX2x6HxSR7HNeTxqiKrOvKnuittYVdA=
+github.com/go-git/go-git-fixtures/v4 v4.0.1/go.mod h1:m+ICp2rF3jDhFgEZ/8yziagdT1C+ZpZcrJjappBCDSw=
+github.com/go-git/go-git/v5 v5.1.0 h1:HxJn9g/E7eYvKW3Fm7Jt4ee8LXfPOm/H1cdDu8vEssk=
+github.com/go-git/go-git/v5 v5.1.0/go.mod h1:ZKfuPUoY1ZqIG4QG9BDBh3G4gLM5zvPuSJAozQrZuyM=
+github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
+github.com/imdario/mergo v0.3.9 h1:UauaLniWCFHWd+Jp9oCEkTBj8VO/9DKg3PV3VCNMDIg=
+github.com/imdario/mergo v0.3.9/go.mod h1:2EnlNZ0deacrJVfApfmtdGgDfMuh/nq6Ok1EcJh5FfA=
+github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99 h1:BQSFePA1RWJOlocH6Fxy8MmwDt+yVQYULKfN0RoTN8A=
+github.com/jbenet/go-context v0.0.0-20150711004518-d14ea06fba99/go.mod h1:1lJo3i6rXxKeerYnT8Nvf0QmHCRC1n8sfWVwXF2Frvo=
+github.com/jessevdk/go-flags v1.4.0/go.mod h1:4FA24M0QyGHXBuZZK/XkWh8h0e1EYbRYJSGM75WSRxI=
+github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd h1:Coekwdh0v2wtGp9Gmz1Ze3eVRAWJMLokvN3QjdzCHLY=
+github.com/kevinburke/ssh_config v0.0.0-20190725054713-01f96b0aa0cd/go.mod h1:CT57kijsi8u/K/BOFA39wgDQJ9CxiF4nAY/ojJ6r6mM=
+github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
+github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
+github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
+github.com/kr/text v0.2.0/go.mod h1:eLer722TekiGuMkidMxC/pM04lWEeraHUUmBw8l2grE=
 github.com/kylelemons/godebug v1.1.0 h1:RPNrshWIDI6G2gRW9EHilWtl7Z6Sb1BR0xunSBf0SNc=
 github.com/kylelemons/godebug v1.1.0/go.mod h1:9/0rRGxNHcop5bhtWyNeEfOS8JIWk580+fNqagV/RAw=
 github.com/mattn/go-runewidth v0.0.4 h1:2BvfKmzob6Bmd4YsL0zygOqfdFnK7GR4QL06Do4/p7Y=
 github.com/mattn/go-runewidth v0.0.4/go.mod h1:LwmH8dsx7+W8Uxz3IHJYH5QSwggIsqBzpuz5H//U1FU=
 github.com/mattn/go-sqlite3 v1.11.0 h1:LDdKkqtYlom37fkvqs8rMPFKAMe8+SgjbwZ6ex1/A/Q=
 github.com/mattn/go-sqlite3 v1.11.0/go.mod h1:FPy6KqzDD04eiIsT53CuJW3U88zkxoIYsOqkbpncsNc=
+github.com/mitchellh/go-homedir v1.1.0 h1:lukF9ziXFxDFPkA1vsr5zpc1XuPDn/wFntq5mG+4E0Y=
+github.com/mitchellh/go-homedir v1.1.0/go.mod h1:SfyaCUpYCn1Vlf4IUYiD9fPX4A5wJrkLzIz1N1q0pr0=
 github.com/naoina/go-stringutil v0.1.0 h1:rCUeRUHjBjGTSHl0VC00jUPLz8/F9dDzYI70Hzifhks=
 github.com/naoina/go-stringutil v0.1.0/go.mod h1:XJ2SJL9jCtBh+P9q5btrd/Ylo8XwT/h1USek5+NqSA0=
 github.com/naoina/toml v0.1.1 h1:PT/lllxVVN0gzzSqSlHEmP8MJB4MY2U7STGxiouV4X8=
 github.com/naoina/toml v0.1.1/go.mod h1:NBIhNtsFMo3G2szEBne+bO4gS192HuIYRqfvOWb4i1E=
+github.com/niemeyer/pretty v0.0.0-20200227124842-a10e7caefd8e/go.mod h1:zD1mROLANZcx1PVRCS0qkT7pwLkGfwJo4zjcN/Tysno=
 github.com/olekukonko/tablewriter v0.0.1 h1:b3iUnf1v+ppJiOfNX4yxxqfWKMQPZR5yoh8urCTFX88=
 github.com/olekukonko/tablewriter v0.0.1/go.mod h1:vsDQFd/mU46D+Z4whnwzcISnGGzXWMclvtLoiIKAKIo=
 github.com/otiai10/copy v1.0.1 h1:gtBjD8aq4nychvRZ2CyJvFWAw0aja+VHazDdruZKGZA=
@@ -27,28 +60,49 @@ github.com/otiai10/mint v1.2.3 h1:PsrRBmrxR68kyNu6YlqYHbNlItc5vOkuS6LBEsNttVA=
 github.com/otiai10/mint v1.2.3/go.mod h1:YnfyPNhBvnY8bW4SGQHCs/aAFhkgySlMZbrF5U0bOVw=
 github.com/otiai10/mint v1.3.0 h1:Ady6MKVezQwHBkGzLFbrsywyp09Ah7rkmfjV3Bcr5uc=
 github.com/otiai10/mint v1.3.0/go.mod h1:F5AjcsTsWUqX+Na9fpHb52P8pcRX2CI6A3ctIT91xUo=
+github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
 github.com/remeh/sizedwaitgroup v0.0.0-20180822144253-5e7302b12cce h1:aP+C+YbHZfOQlutA4p4soHi7rVUqHQdWEVMSkHfDTqY=
 github.com/remeh/sizedwaitgroup v0.0.0-20180822144253-5e7302b12cce/go.mod h1:3j2R4OIe/SeS6YDhICBy22RWjJC5eNCJ1V+9+NVNYlo=
+github.com/sergi/go-diff v1.1.0 h1:we8PVUC3FE2uYfodKH/nBHMSetSfHDR6scGdBi+erh0=
+github.com/sergi/go-diff v1.1.0/go.mod h1:STckp+ISIX8hZLjrqAeVduY0gWCT9IjLuqbuNXdaHfM=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
+github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
+github.com/xanzy/ssh-agent v0.2.1 h1:TCbipTQL2JiiCprBWx9frJ2eJlCYT00NmctrHxVAr70=
+github.com/xanzy/ssh-agent v0.2.1/go.mod h1:mLlQY/MoOhWBj+gOGMQkOeiEvkx+8pJSI+0Bx9h2kr4=
 github.com/zcalusic/sysinfo v0.0.0-20190429151633-fbadb57345c2 h1:uMiaKNX5zFLOa6nNtun+d/lpV5bOBh7BvE4q9jfZacQ=
 github.com/zcalusic/sysinfo v0.0.0-20190429151633-fbadb57345c2/go.mod h1:zAn3FAIbgZPYnutDND49Ivf8sb/mXYk8UjZdqMswgHg=
+golang.org/x/crypto v0.0.0-20190219172222-a4c6cb3142f2/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5 h1:58fnuSXlxZmFdJyvtTFVmVhcMLU6v5fEb/ok4wyqtNU=
 golang.org/x/crypto v0.0.0-20190605123033-f99c8df09eb5/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
+golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073 h1:xMPOj6Pz6UipU1wXLkrtqpHbR0AVFnyPEQq/wRWz9lM=
+golang.org/x/crypto v0.0.0-20200302210943-78000ba7a073/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
+golang.org/x/net v0.0.0-20200301022130-244492dfa37a h1:GuSPYbZzB5/dcLNCwLQLsg3obCJtX9IJhpXkvY7kzk0=
+golang.org/x/net v0.0.0-20200301022130-244492dfa37a/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
+golang.org/x/sys v0.0.0-20190221075227-b4e8571b14e0/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527 h1:uYVVQ9WP/Ds2ROhcaGPeIdVq0RIXVLwsHlnvJ+cT1So=
+golang.org/x/sys v0.0.0-20200302150141-5c8b2ff67527/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6 h1:jMFz6MfLP0/4fUyZle81rXUoxOBFi19VUFKVDOQfozc=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20190902080502-41f04d3bba15/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/check.v1 v1.0.0-20200227125254-8fa46927fb4f/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/logrusorgru/aurora.v2 v2.0.0-20190417123914-21d75270181e h1:Wc0601/F/0TByNewL9UAKk18FfwumyYyT8pJMIHcolA=
 gopkg.in/logrusorgru/aurora.v2 v2.0.0-20190417123914-21d75270181e/go.mod h1:Wm+IEn1fgFp8E2paL93oFVrHZW4toMKARNE85fDY5w8=
+gopkg.in/warnings.v0 v0.1.2 h1:wFXVbFY8DY5/xOe1ECiWdKCzZlxgshcYVNkBHstARME=
+gopkg.in/warnings.v0 v0.1.2/go.mod h1:jksf8JmL6Qr/oQM2OXTHunEvvTAsrWBLb6OOjuVWRNI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
diff --git a/main.go b/main.go
index e04eed2..07b851f 100644
--- a/main.go
+++ b/main.go
@@ -126,6 +126,9 @@ func main() {
 	thresholdFlag := app.Flag("threshold", "Reliablity threshold for exit code")
 	threshold := thresholdFlag.Default("1.00").Float64()
 
+	disablePreloadFlag := app.Flag("disable-preload", "Disable module preload")
+	disablePreload = disablePreloadFlag.Bool()
+
 	pewCommand := app.Command("pew", "Build, run and test module/exploit")
 
 	pewMax := pewCommand.Flag("max", "Test no more than X kernels").
diff --git a/pew.go b/pew.go
index 49af13c..fffbe71 100644
--- a/pew.go
+++ b/pew.go
@@ -395,6 +395,12 @@ func whatever(swg *sizedwaitgroup.SizedWaitGroup, ka config.Artifact,
 		return
 	}
 
+	err = preloadModules(q, ka, ki, dockerTimeout)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
 	copyArtifactAndTest(q, ka, &result, remoteTest)
 }
 
diff --git a/preload.go b/preload.go
new file mode 100644
index 0000000..706eb51
--- /dev/null
+++ b/preload.go
@@ -0,0 +1,172 @@
+// Copyright 2020 Mikhail Klementev. All rights reserved.
+// Use of this source code is governed by a AGPLv3 license
+// (or later) that can be found in the LICENSE file.
+
+package main
+
+import (
+	"crypto/sha1"
+	"encoding/hex"
+	"errors"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/user"
+	"path/filepath"
+	"time"
+
+	"github.com/go-git/go-git/v5"
+
+	"code.dumpstack.io/tools/out-of-tree/config"
+	"code.dumpstack.io/tools/out-of-tree/qemu"
+)
+
+var disablePreload *bool
+
+func preloadModules(q *qemu.System, ka config.Artifact, ki config.KernelInfo,
+	dockerTimeout time.Duration) (err error) {
+
+	if *disablePreload {
+		return
+	}
+
+	for _, pm := range ka.Preload {
+		err = preload(q, ki, pm, dockerTimeout)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+func preload(q *qemu.System, ki config.KernelInfo, pm config.PreloadModule,
+	dockerTimeout time.Duration) (err error) {
+
+	var workPath, cache string
+	if pm.Path != "" {
+		log.Println("Use non-git path for preload module (no cache)")
+		workPath = pm.Path
+	} else if pm.Repo != "" {
+		workPath, cache, err = cloneOrPull(pm.Repo, ki)
+		if err != nil {
+			return
+		}
+	} else {
+		errors.New("No repo/path in preload entry")
+	}
+
+	err = buildAndInsmod(workPath, q, ki, dockerTimeout, cache)
+	if err != nil {
+		return
+	}
+
+	time.Sleep(pm.TimeoutAfterLoad.Duration)
+	return
+}
+
+func buildAndInsmod(workPath string, q *qemu.System, ki config.KernelInfo,
+	dockerTimeout time.Duration, cache string) (err error) {
+
+	tmp, err := ioutil.TempDir("", "out-of-tree_")
+	if err != nil {
+		return
+	}
+	defer os.RemoveAll(tmp)
+
+	var artifact string
+	if exists(cache) {
+		artifact = cache
+	} else {
+		artifact, err = buildPreload(workPath, tmp, ki, dockerTimeout)
+		if err != nil {
+			return
+		}
+		if cache != "" {
+			err = copyFile(artifact, cache)
+			if err != nil {
+				return
+			}
+		}
+	}
+
+	output, err := q.CopyAndInsmod(artifact)
+	if err != nil {
+		log.Println(output)
+		return
+	}
+	return
+}
+
+func buildPreload(workPath, tmp string, ki config.KernelInfo,
+	dockerTimeout time.Duration) (artifact string, err error) {
+
+	ka, err := config.ReadArtifactConfig(workPath + "/.out-of-tree.toml")
+	if err != nil {
+		return
+	}
+
+	ka.SourcePath = workPath
+
+	km := config.KernelMask{DistroType: ki.DistroType,
+		DistroRelease: ki.DistroRelease,
+		ReleaseMask:   ki.KernelRelease,
+	}
+	ka.SupportedKernels = []config.KernelMask{km}
+
+	if ka.Docker.Timeout.Duration != 0 {
+		dockerTimeout = ka.Docker.Timeout.Duration
+	}
+
+	artifact, _, err = build(tmp, ka, ki, dockerTimeout)
+	return
+}
+
+func cloneOrPull(repo string, ki config.KernelInfo) (workPath, cache string, err error) {
+	usr, err := user.Current()
+	if err != nil {
+		return
+	}
+	base := filepath.Join(usr.HomeDir, "/.out-of-tree/preload/")
+	workPath = filepath.Join(base, "/repos/", sha1sum(repo))
+
+	var r *git.Repository
+	if exists(workPath) {
+		r, err = git.PlainOpen(workPath)
+		if err != nil {
+			return
+		}
+
+		var w *git.Worktree
+		w, err = r.Worktree()
+		if err != nil {
+			return
+		}
+
+		err = w.Pull(&git.PullOptions{})
+		if err != nil && err != git.NoErrAlreadyUpToDate {
+			log.Println(repo, "pull error:", err)
+		}
+	} else {
+		r, err = git.PlainClone(workPath, false, &git.CloneOptions{URL: repo})
+		if err != nil {
+			return
+		}
+	}
+
+	ref, err := r.Head()
+	if err != nil {
+		return
+	}
+
+	cachedir := filepath.Join(base, "/cache/")
+	os.MkdirAll(cachedir, 0700)
+
+	filename := sha1sum(repo + ki.KernelPath + ref.Hash().String())
+	cache = filepath.Join(cachedir, filename)
+	return
+}
+
+func sha1sum(data string) string {
+	h := sha1.Sum([]byte(data))
+	return hex.EncodeToString(h[:])
+}