module not found after make install #238

corinnespi · 2019-10-15T06:13:20Z

see #237
I did previously make install and it was working until the new kernel.
I redo it and it gave that :

/v4l2loopback$ sudo make install
[sudo] Mot de passe de corinnes : 
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback modules_install
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-65-generic »
  INSTALL /home/corinnes/v4l2loopback/v4l2loopback.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  4.15.0-65-generic
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-65-generic »

The text was updated successfully, but these errors were encountered:

umlaeute · 2019-10-15T08:02:54Z

please, pretty please, use a meaningful title ("does not work" is not meaningful, neither is "found a bug"; "following" is meaningless when you look at the list of issues, "last update of kernel" means something totally different for you (who is running Linux-4.15.0-65) and others, like me (who is running Linux-5.2.0-2)

anyhow:

I am not sure whether the error you see is really an error. there have been reports of similar "issues" (e.g. #230) and all of them turned out to be some intermediate glitches that resolved to warnings in the end.

If you indeed experience an error, the last line of the output you receive from sudo make install should be something like that:

make: *** [Makefile:47: install] Error 2

If the last line does not indicate an error, most likely there is none. and you succeeded to install the module.
So run modprobe again and see whether you can load the module.

corinnespi · 2019-10-15T08:42:20Z

After : modprobe v4l2loopback in terminal
modprobe: FATAL: Module v4l2loopback not found in directory /lib/modules/4.15.0-65-generic

umlaeute · 2019-10-15T08:55:29Z

please run:

sudo make install V=1; echo $?

and paste the full output you get, including the command you run (at the beginning) and the cmdline-prompt (at the end).

corinnespi · 2019-10-15T09:21:43Z

~$ cd v4l2loopback
~/v4l2loopback$ sudo make install V=1; echo $?
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback modules_install
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-65-generic »
test -e include/generated/autoconf.h -a -e include/config/auto.conf || (	\
echo >&2;							\
echo >&2 "  ERROR: Kernel configuration is invalid.";		\
echo >&2 "         include/generated/autoconf.h or include/config/auto.conf are missing.";\
echo >&2 "         Run 'make oldconfig && make prepare' on kernel src to fix it.";	\
echo >&2 ;							\
/bin/false)
mkdir -p /lib/modules/4.15.0-65-generic/extra
make -f ./scripts/Makefile.modinst
  mkdir -p /lib/modules/4.15.0-65-generic/extra ; cp /home/corinnes/v4l2loopback/v4l2loopback.ko /lib/modules/4.15.0-65-generic/extra ; true /lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko ; if (echo "/lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko" | egrep -q "\/drivers\/staging\/") && [ -f ./drivers/staging/signature-inclusion ] && (! egrep -x "v4l2loopback.ko" ./drivers/staging/signature-inclusion) ; then echo Not signing "/lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko"; else scripts/sign-file "sha512" "certs/signing_key.pem" certs/signing_key.x509 /lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko || true && true /lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko; fi
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
sign-file: certs/signing_key.pem: No such file or directory
  /bin/bash ./scripts/depmod.sh /sbin/depmod 4.15.0-65-generic ""
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-65-generic »
0

corinnespi · 2019-10-15T09:23:45Z

PS : Sorry about name and so on, I am only a normal human ! A Muggle !

umlaeute · 2019-10-15T10:14:40Z

so according to the output, both the compilation and the installation succeed and the module is copied to /lib/modules/4.15.0-65-generic/extra/
could you confirm that the v4l2loopback.ko file exists inside this directory?

then run sudo depmod -a and see what it reports.

then run sudo modprobe v4l2loopback

if it still cannot find the module, try running sudo strace -e trace=%file modprobe v4l2loopback (after installing the strace package), and post the output of that command.

corinnespi · 2019-10-15T11:44:51Z

/home/corinnes/v4l2loopback/v4l2loopback.ko
when i do sudo depmod -a, nothing happens !

Trace :

$ sudo strace -e trace=%file modprobe v4l2loopback
execve("/sbin/modprobe", ["modprobe", "v4l2loopback"], 0x7ffec243d728 /* 27 vars */) = 0
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
access("/etc/ld.so.preload", R_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
access("/etc/ld.so.nohwcap", F_OK)      = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/x86_64-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
stat("/etc/modprobe.d", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/etc/modprobe.d", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
newfstatat(3, "blacklist-modem.conf", {st_mode=S_IFREG|0644, st_size=156, ...}, 0) = 0
newfstatat(3, "blacklist-oss.conf", {st_mode=S_IFREG|0644, st_size=1059, ...}, 0) = 0
newfstatat(3, "blacklist-rare-network.conf", {st_mode=S_IFREG|0644, st_size=583, ...}, 0) = 0
newfstatat(3, "blacklist.conf", {st_mode=S_IFREG|0644, st_size=1667, ...}, 0) = 0
newfstatat(3, "intel-microcode-blacklist.conf", {st_mode=S_IFREG|0644, st_size=154, ...}, 0) = 0
newfstatat(3, "blacklist-framebuffer.conf", {st_mode=S_IFREG|0644, st_size=697, ...}, 0) = 0
newfstatat(3, "blacklist-ath_pci.conf", {st_mode=S_IFREG|0644, st_size=325, ...}, 0) = 0
newfstatat(3, "alsa-base.conf", {st_mode=S_IFREG|0644, st_size=2507, ...}, 0) = 0
newfstatat(3, "dkms.conf", {st_mode=S_IFREG|0644, st_size=127, ...}, 0) = 0
newfstatat(3, "blacklist-firewire.conf", {st_mode=S_IFREG|0644, st_size=210, ...}, 0) = 0
newfstatat(3, "iwlwifi.conf", {st_mode=S_IFREG|0644, st_size=347, ...}, 0) = 0
newfstatat(3, "amd64-microcode-blacklist.conf", {st_mode=S_IFREG|0644, st_size=154, ...}, 0) = 0
stat("/run/modprobe.d", 0x7ffca67cfe30) = -1 ENOENT (No such file or directory)
stat("/lib/modprobe.d", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
openat(AT_FDCWD, "/lib/modprobe.d", O_RDONLY|O_NONBLOCK|O_CLOEXEC|O_DIRECTORY) = 3
newfstatat(3, "fbdev-blacklist.conf", {st_mode=S_IFREG|0644, st_size=390, ...}, 0) = 0
newfstatat(3, "aliases.conf", {st_mode=S_IFREG|0644, st_size=655, ...}, 0) = 0
newfstatat(3, "blacklist_linux_4.15.0-64-generic.conf", {st_mode=S_IFREG|0644, st_size=1461, ...}, 0) = 0
newfstatat(3, "systemd.conf", {st_mode=S_IFREG|0644, st_size=765, ...}, 0) = 0
newfstatat(3, "blacklist_linux_4.15.0-65-generic.conf", {st_mode=S_IFREG|0644, st_size=1461, ...}, 0) = 0
openat(AT_FDCWD, "/lib/modprobe.d/aliases.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/alsa-base.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/amd64-microcode-blacklist.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-ath_pci.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-firewire.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-framebuffer.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-modem.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-oss.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist-rare-network.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/blacklist.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modprobe.d/blacklist_linux_4.15.0-64-generic.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modprobe.d/blacklist_linux_4.15.0-65-generic.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/dkms.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modprobe.d/fbdev-blacklist.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/intel-microcode-blacklist.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/etc/modprobe.d/iwlwifi.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/modules.softdep", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modprobe.d/systemd.conf", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/proc/cmdline", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/modules.dep.bin", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/modules.alias.bin", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/modules.symbols.bin", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/modules.builtin.bin", O_RDONLY|O_CLOEXEC) = 3
stat("/lib/modules/4.15.0-65-generic/kernel/drivers/media/v4l2-core/videodev.ko", {st_mode=S_IFREG|0644, st_size=291713, ...}) = 0
stat("/lib/modules/4.15.0-65-generic/kernel/drivers/media/media.ko", {st_mode=S_IFREG|0644, st_size=54793, ...}) = 0
openat(AT_FDCWD, "/sys/module/v4l2loopback/initstate", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/sys/module/v4l2loopback", 0x7ffca67cfdb0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/sys/module/media/initstate", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/sys/module/videodev/initstate", O_RDONLY|O_CLOEXEC) = 3
openat(AT_FDCWD, "/sys/module/v4l2loopback/initstate", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
stat("/sys/module/v4l2loopback", 0x7ffca67cfdb0) = -1 ENOENT (No such file or directory)
openat(AT_FDCWD, "/lib/modules/4.15.0-65-generic/extra/v4l2loopback.ko", O_RDONLY|O_CLOEXEC) = 3
modprobe: ERROR: could not insert 'v4l2loopback': Exec format error
+++ exited with 1 +++
$

umlaeute · 2019-10-15T12:27:41Z

so according to the output, both the compilation and the installation succeed and the module is copied to /lib/modules/4.15.0-65-generic/extra/
could you confirm that the v4l2loopback.ko file exists inside this directory?

with this directory i really meant the /lib/modules/4.15.0-65-generic/extra/ directory.
(modprobe will not search in /home/corinnes/v4l2loopback/, so this doesn't matter).

anyhow, your trace clearly shows that suddenly the module can be found (see the third-last line in the trace, the one containing a successfull openat).
You will also notice that the error message changed from FATAL: Module v4l2loopback not found to ERROR: Exec format error.

That might have multiple reasons, but I'd like to stress that all of these reasons are due to your system setup, and not related to (or fixable by) v4l2loopback.

The obvious fix is to make sure that you properly re-compile:

make clean
make
sudo make install
sudo modprobe v4l2loopback

make sure that make clean succeeds first (that is: it can remove any build-leftovers from previous build attempts), before you run the rest of the commands.
If that doesn't help either, then I cannot help you anymore, and you should try to find out what happened to your system.

umlaeute · 2019-10-16T07:43:58Z

so did that fix the issue?

corinnespi · 2019-10-25T06:21:42Z

I was not at office today, and tomorrow it will be the same. I will look at that friday, as I don't want to do it quickly, I have to concentrate. Thanks for asking. If it is ok, I will inform you of course.

corinnespi · 2019-10-25T06:22:48Z

I did "make clean", I have "make: *** Aucune règle pour fabriquer la cible « clean ». Arrêt.
" which means no rules to make a clean !

umlaeute · 2019-10-25T07:44:17Z

where did you run make clean?

corinnespi · 2019-10-25T08:08:57Z

On the terminal.
after that I used also a cleanup software from Ubuntu. Is that enough?
I am not on my computer now so I cannot tel you the exact name of the software.

umlaeute · 2019-10-25T12:33:10Z

nah. i meant "in which directory".

if you have no rule for " clean", then i think you are running that command in the wrong directory.

corinnespi · 2019-10-25T13:39:36Z

OK, I did not understand I have to be in the directory from v4l2loopback
Make clean :

rm -f *~
rm -f Module.symvers Module.markers modules.order
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback clean
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-66-generic »
  CLEAN   /home/corinnes/v4l2loopback/.tmp_versions
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-66-generic »
rm -f *~
rm -f Module.symvers Module.markers modules.order
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback clean
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-66-generic »
  CLEAN   /home/corinnes/v4l2loopback/.tmp_versions
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-66-generic »

Make :

$ make
Building v4l2-loopback driver...
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback modules
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-66-generic »
  CC [M]  /home/corinnes/v4l2loopback/v4l2loopback.o
symbolmap: la: invalid section
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/corinnes/v4l2loopback/v4l2loopback.mod.o
  LD [M]  /home/corinnes/v4l2loopback/v4l2loopback.ko
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-66-generic »

$ sudo make install
[sudo] Mot de passe de corinnes : 
make -C /lib/modules/`uname -r`/build M=/home/corinnes/v4l2loopback modules_install
make[1] : on entre dans le répertoire « /usr/src/linux-headers-4.15.0-66-generic »
  INSTALL /home/corinnes/v4l2loopback/v4l2loopback.ko
At main.c:160:
- SSL error:02001002:system library:fopen:No such file or directory: ../crypto/bio/bss_file.c:72
- SSL error:2006D080:BIO routines:BIO_new_file:no such file: ../crypto/bio/bss_file.c:79
sign-file: certs/signing_key.pem: No such file or directory
  DEPMOD  4.15.0-66-generic
make[1] : on quitte le répertoire « /usr/src/linux-headers-4.15.0-66-generic »

$ sudo modprobe v4l2loopback
modprobe: FATAL: Module v4l2loopback not found in directory /lib/modules/4.15.0-66-generic

And it still don't work with obs and no virtual cam :
v4l2-ctl --list-devices
Chicony USB2.0 Camera: Chicony (usb-0000:00:14.0-6):
/dev/video0
:(

umlaeute · 2019-10-28T15:40:16Z

i'm about 99% sure that this problem is not related to v4l2loopback itself, but rather to your specific system setup (or PBKAC). i'm aware that this assessment doesn't help you much (but I also don't want to keep spending my time on a problem which i feel is not mine). so...

since you are using ubuntu, why don't you just install the v4l2loopback package that comes with your distribution:

sudo apt-get install v4l2loopback-dkms

this should install all the relevant packages for building kernel modules, and build and install them.
(although Ubuntu/bionic comes with v4l2loopback-0.10.0, so you are not getting the latest stuff)

if the above still fails to produce usable kernel modules, try installing another dkms-package (e.g. acpi-call-dkms, or ) and see whether this produces a usable module (e.g. modprobe acpi_call suceeds) - if it fails, you probably should seek advice in some general ubuntu forum.

if everything works and only v4l2loopback fails to build, come back and we might continue to hunt down the issue (no need to open a new issue then, just keep posting to this one and I might re-open it)

BellemareMederic · 2020-11-24T21:06:56Z

sudo depmod -a
save my installation thanks

so according to the output, both the compilation and the installation succeed and the module is copied to /lib/modules/4.15.0-65-generic/extra/
could you confirm that the v4l2loopback.ko file exists inside this directory?

then run sudo depmod -a and see what it reports.

then run sudo modprobe v4l2loopback

if it still cannot find the module, try running sudo strace -e trace=%file modprobe v4l2loopback (after installing the strace package), and post the output of that command.

corinnespi changed the title ~~following does not work since the last update of kernel (#237)~~ v4l2loopback /modprobe / fatal Oct 15, 2019

corinnespi changed the title ~~v4l2loopback /modprobe / fatal~~ module not found after make install Oct 15, 2019

Repository owner deleted a comment from corinnespi Oct 15, 2019

Repository owner deleted a comment from corinnespi Oct 16, 2019

umlaeute closed this as completed Oct 28, 2019

umlaeute mentioned this issue Apr 26, 2020

modprobe: ERROR: could not insert 'v4l2loopback': Exec format error #296

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umlaeute mentioned this issue May 30, 2020

modprobe: ERROR: could not insert 'v4l2loopback': Exec format error #313

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DominikAgejev mentioned this issue Sep 11, 2020

Dependency issue: make > make: *** [Makefile:43: v4l2loopback.ko] Error 2 #342

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umlaeute mentioned this issue Apr 2, 2024

modprobe: ERROR: could not insert 'v4l2loopback': Exec format error #583

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