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| By default, EBPF programs will not run on WSL2 due to required kernel modules missing. The following example error is an | |
| indication of this problem: | |
| modprobe: ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file '/lib/modules/4.19.84-microso | |
| ft-standard/modules.dep.bin' | |
| modprobe: FATAL: Module kheaders not found in directory /lib/modules/4.19.84-microsoft-standard | |
| chdir(/lib/modules/4.19.84-microsoft-standard/build): No such file or directory | |
| To fix this you need to rebuild the WSL2 kernel with the missing kernel modules. The below instructions are for Ubuntu 18.04 WSL2. | |
| 1. git clone https://github.com/microsoft/WSL2-Linux-Kernel.git | |
| 2. cd WSL2-Linux-Kernel | |
| 3. sudo apt install flex bison build-essential libelf-dev libncurses-dev libssl-dev | |
| 4. cp Microsoft/config-wsl .config | |
| 5. Add the kernel flags specified in https://github.com/iovisor/bcc/blob/master/INSTALL.md#kernel-configuration to .config | |
| 6. export KERNELRELEASE=4.19.84-microsoft-standard | |
| NOTE: Make sure the version corresponds to the version of WSL2. Run: uname -a | |
| 7. make KERNELRELEASE=$KERNELRELEASE -j 4 | |
| 8. make KERNELRELEASE=$KERNELRELEASE modules -j 4 | |
| 9. sudo make KERNELRELEASE=$KERNELRELEASE modules_install | |
| 10. (confirm you can see files under /lib/modules/$(uname -r)) | |
| 11. sudo mount -t debugfs debugfs /sys/kernel/debug (for any apps that uses it since its not mounted by default) |
Is there a solution for Ubuntu 20?
Just adding my experience here with ubuntu 20 and wsl kernel version 5.10.16.3-microsoft-standard
- Add the kernel flags specified in https://github.com/iovisor/bcc/blob/master/INSTALL.md#kernel-configuration to .config
Followed as instructed, and modified these config values
CONFIG_BPF=y
CONFIG_BPF_SYSCALL=y
# [optional, for tc filters]
CONFIG_NET_CLS_BPF=m
# [optional, for tc actions]
CONFIG_NET_ACT_BPF=m
CONFIG_BPF_JIT=y
# [for Linux kernel versions 4.1 through 4.6]
CONFIG_HAVE_BPF_JIT=y
# [for Linux kernel versions 4.7 and later]
CONFIG_HAVE_EBPF_JIT=y
# [optional, for kprobes]
CONFIG_BPF_EVENTS=y
# Need kernel headers through /sys/kernel/kheaders.tar.xz
CONFIG_IKHEADERS=y
CONFIG_NET_SCH_SFQ=m
CONFIG_NET_ACT_POLICE=m
CONFIG_NET_ACT_GACT=m
CONFIG_DUMMY=m
CONFIG_VXLAN=m
make KERNELRELEASE=$KERNELRELEASE -j 4I ran into this error:
BTF: .tmp_vmlinux.btf: pahole (pahole) is not available
Failed to generate BTF for vmlinux
Try to disable CONFIG_DEBUG_INFO_BTF
make: *** [Makefile:1179: vmlinux] Error 1
Solution is to install dwarves sudo apt install dwarves and repeat step 7. make KERNELRELEASE=$KERNELRELEASE -j 4
Otherwise no other issues!
This actually working for you? BCC tools don't seem to work for me as kernel modules are missing (I am on preview WSL).
Just adding my experience here with ubuntu 20 and wsl kernel version
5.10.16.3-microsoft-standard
- Add the kernel flags specified in https://github.com/iovisor/bcc/blob/master/INSTALL.md#kernel-configuration to .config
Followed as instructed, and modified these config values
CONFIG_BPF=y CONFIG_BPF_SYSCALL=y # [optional, for tc filters] CONFIG_NET_CLS_BPF=m # [optional, for tc actions] CONFIG_NET_ACT_BPF=m CONFIG_BPF_JIT=y # [for Linux kernel versions 4.1 through 4.6] CONFIG_HAVE_BPF_JIT=y # [for Linux kernel versions 4.7 and later] CONFIG_HAVE_EBPF_JIT=y # [optional, for kprobes] CONFIG_BPF_EVENTS=y # Need kernel headers through /sys/kernel/kheaders.tar.xz CONFIG_IKHEADERS=y CONFIG_NET_SCH_SFQ=m CONFIG_NET_ACT_POLICE=m CONFIG_NET_ACT_GACT=m CONFIG_DUMMY=m CONFIG_VXLAN=m
make KERNELRELEASE=$KERNELRELEASE -j 4I ran into this error:BTF: .tmp_vmlinux.btf: pahole (pahole) is not available Failed to generate BTF for vmlinux Try to disable CONFIG_DEBUG_INFO_BTF make: *** [Makefile:1179: vmlinux] Error 1Solution is to install dwarves
sudo apt install dwarvesand repeat step7.make KERNELRELEASE=$KERNELRELEASE -j 4Otherwise no other issues!
I build a customer wsl2 kernel with EBPF config added. And use it as wsl2 kernel.
But when i tried to run ebp program in samples/bpf (inside linux kernel), still get error message as following:
baoqger:/usr/src/linux-5.10.16/samples/bpf$ sudo ./cpustat
[sudo] password for baoqger:
libbpf: elf: skipping unrecognized data section(22) .eh_frame
libbpf: elf: skipping relo section(23) .rel.eh_frame for section(22) .eh_frame
libbpf: failed to determine tracepoint 'power/cpu_idle' perf event ID: No such file or directory
libbpf: prog 'bpf_prog1': failed to create tracepoint 'power/cpu_idle' perf event: No such file or directory
ERROR: bpf_program__attach failed
Another thing need mention is: in the latest version of WSL2-Linux-Kernel, most of the EBPF flag required in this link: https://github.com/iovisor/bcc/blob/master/INSTALL.md#kernel-configuration is enabled by default. The only one need your setting is:
CONFIG_IKHEADERS=y
Can anyone give one hello-world demo to verify that bpf program can run on WSL2? In this way, we can troubleshoot that the issue is in bpf program aspect or wsl2 aspect?
@baoqger here is a hello-world i used, and it worked.
#!/usr/bin/python3
from bcc import BPF
from time import sleep
program = """
BPF_HASH(clones);
int hello_world(void *ctx) {
u64 uid;
u64 counter = 0;
u64 *p;
uid = bpf_get_current_uid_gid() & 0xFFFFFFFF;
p = clones.lookup(&uid);
if (p != 0){
counter = *p;
}
counter++;
clones.update(&uid, &counter);
return 0;
}
"""
b = BPF(text=program)
clone = b.get_syscall_fnname("clone")
b.attach_kprobe(event=clone, fn_name="hello_world")
b.trace_print()
sleep(1000)
while True:
sleep(2)
s = ""
if len(b["clones"].items()):
for k,v in b["clones"].items():
s += "ID {}: {}\t".format(k.value, v.value)
print(s)
else:
print("No entries yet")
I still encountered such problem after rebuilding the kernel.
modprobe: FATAL: Module kheaders not found in directory /lib/modules/5.10.102.1-microsoft-standard-WSL2
I still encountered such problem after rebuilding the kernel.
modprobe: FATAL: Module kheaders not found in directory /lib/modules/5.10.102.1-microsoft-standard-WSL2
I have exact same issue also did what they said to do here https://gist.github.com/cerebrate/d40c89d3fa89594e1b1538b2ce9d2720
and I get the same error of modules not found.
tried configuring CONFIG_IKHEADERS=m and also CONFIG_IKHEADERS=y both didn't work
just running make, or the commands listed in steps 7-9 also did not change anything.
I will note that in all trials I did not see anything under /lib/modules/$(uname -r) per step 10
step 11 I do not understand doesn't seem to make a difference either.
also I am sure I am running the custom built kernel as I changed CONFIG_LOCALVERSION to make sure.
Unable to find kernel headers. Try rebuilding kernel with CONFIG_IKHEADERS=m (module) or installing the kernel development package for your running kernel version.
chdir(/lib/modules/5.10.102.1-microsoft-ebpf-WSL2+/build): No such file or directory
This gist was written quite a while ago. If you are still having problems enabling eBPF on WSL2 I would recommend filing an issue in their repo. If I end up trying it again in the future I'll update this gist with any changes that may be needed.
Can anyone give one hello-world demo to verify that bpf program can run on WSL2? In this way, we can troubleshoot that the issue is in bpf program aspect or wsl2 aspect?
Hi @baoqger,
I have a mistake:
FAILED: load BTF from vmlinux: Unknown error -2make: *** [Makefile:1179: vmlinux] Error 255
Has that ever happened to you?
Thank you for the nice and well structured guide, worked without any issues for me. 😃
Hi, @MetaT1an @satanshiro,
Have you tried using the following command
export KERNELRELEASE=$(uname -r)to replace the original one in https://gist.github.com/MarioHewardt/5759641727aae880b29c8f715ba4d30f#file-enable_ebpf_on_wsl2-L15
For me, I can see the new content in /lib/modules/$(uname -r) after rebuilding the kernel.
The kernel KERNELRELEASE should have -WSL2 as the suffix.
@baoqger here is a hello-world i used, and it worked.
#!/usr/bin/python3 from bcc import BPF from time import sleep program = """ BPF_HASH(clones); int hello_world(void *ctx) { u64 uid; u64 counter = 0; u64 *p; uid = bpf_get_current_uid_gid() & 0xFFFFFFFF; p = clones.lookup(&uid); if (p != 0){ counter = *p; } counter++; clones.update(&uid, &counter); return 0; } """ b = BPF(text=program) clone = b.get_syscall_fnname("clone") b.attach_kprobe(event=clone, fn_name="hello_world") b.trace_print() sleep(1000) while True: sleep(2) s = "" if len(b["clones"].items()): for k,v in b["clones"].items(): s += "ID {}: {}\t".format(k.value, v.value) print(s) else: print("No entries yet")
Here is a simpler one:
#!/usr/bin/python3
from bcc import BPF
program = r"""
int hello(void *ctx) {
bpf_trace_printk("Hello World!");
return 0;
}
"""
b = BPF(text=program)
syscall = b.get_syscall_fnname("execve")
b.attach_kprobe(event=syscall, fn_name="hello")
b.trace_print()
then open a second terminal and run any linux command (ls, echo...etc) and you should see in the trace output Hello World
Can anyone give one hello-world demo to verify that bpf program can run on WSL2? In this way, we can troubleshoot that the issue is in bpf program aspect or wsl2 aspect?
Hi @baoqger, I have a mistake:
FAILED: load BTF from vmlinux: Unknown error -2make: *** [Makefile:1179: vmlinux] Error 255
Has that ever happened to you?
Hey, have you ever found a solution to this? I am having the same issue
Can anyone give one hello-world demo to verify that bpf program can run on WSL2? In this way, we can troubleshoot that the issue is in bpf program aspect or wsl2 aspect?
Hi @baoqger, I have a mistake:
FAILED: load BTF from vmlinux: Unknown error -2make: *** [Makefile:1179: vmlinux] Error 255
Has that ever happened to you?
Hey, habe you ever found a solution to this? I am having the same issue
Same :(
I have been trying to unfuck this for several days. This is a tough son of a bitch to solve. I have followed several guides and still FAILED: load BTF from vmlinux: Unknown error -22make: *** [Makefile:1179: vmlinux] Error 255
I successfully launched eBPF following the guide at https://learn.microsoft.com/en-us/community/content/wsl-user-msft-kernel-v6. However, I used Debian which required the installation of the following packages:
sudo apt install git python3 bc dwarves rsync
Additionally, to run the example Python code provided above, I had to install:
sudo apt install bpfcc-tools python3-bpfcc
Running it initially failed, but I managed to fix it by mounting debugfs with the command:
sudo mount -t debugfs debugfs /sys/kernel/debug
Finally, after opening a new Debian terminal, it printed the following:
b' <...>-275 [004] d...1 91.948441: bpf_trace_printk: Hello World!'
b' bash-276 [007] d...1 91.950385: bpf_trace_printk: Hello World!'
b' <...>-277 [007] d...1 94.875099: bpf_trace_printk: Hello World!'
@deadash thank you!
It finally worked even after I tried several guides and got errors every time. I typed usbip and the menu appeared. I got my device to forward to the VM but I cant connect it to WSL1. I can only get WSL1 to work on the VM so im thinking about trying this with rasberrypi instead
Hi, @MetaT1an @satanshiro,
Have you tried using the following command
export KERNELRELEASE=$(uname -r)to replace the original one in https://gist.github.com/MarioHewardt/5759641727aae880b29c8f715ba4d30f#file-enable_ebpf_on_wsl2-L15
For me, I can see the new content in
/lib/modules/$(uname -r)after rebuilding the kernel.The kernel
KERNELRELEASEshould have-WSL2as the suffix.
Thank you! It works!
I wrote complete guide in my blog
https://massoudasadiblog.blogspot.com/2024/07/ebpf-on-wsl2-kernel-version-6x-ubuntu.html?m=1
I'm point 6. in WSL2 Ubuntu 20.04 LTS I'm trying to use sysinternals from Microsoft in here:
xxxxxxx@NUCCANYON-8:~/WSL2-Linux-Kernel$ sudo procmon
[sudo] password for xxxxxxx:
modprobe: FATAL: Module kheaders not found in directory /lib/modules/5.10.16.3-microsoft-standard-WSL2
Unable to find kernel headers. Try rebuilding kernel with CONFIG_IKHEADERS=m (module) or installing the kernel development package for your running kernel version.
chdir(/lib/modules/5.10.16.3-microsoft-standard-WSL2/build): No such file or directory
terminate called after throwing an instance of 'std::invalid_argument'
what(): Table '' is not an array table
Aborted
Here is my run
xxxxxxx@NUCCANYON-8:
$ git clone https://github.com/microsoft/WSL2-Linux-Kernel.git$ cd WSL2-Linux-KernelCloning into 'WSL2-Linux-Kernel'...
remote: Enumerating objects: 8921264, done.
remote: Total 8921264 (delta 0), reused 0 (delta 0), pack-reused 8921264
Receiving objects: 100% (8921264/8921264), 1.63 GiB | 2.10 MiB/s, done.
Resolving deltas: 100% (7539238/7539238), done.
Updating files: 100% (61777/61777), done.
reynaldoru@NUCCANYON-8:
reynaldoru@NUCCANYON-8:
/WSL2-Linux-Kernel$ sudo apt install flex bison build-essential libelf-dev libncurses-dev libssl-dev20.04 [19.1 kB][sudo] password for reynaldoru:
Reading package lists... Done
Building dependency tree
Reading state information... Done
The following additional packages will be installed:
binutils binutils-common binutils-x86-64-linux-gnu cpp cpp-9 dpkg-dev fakeroot g++ g++-9 gcc gcc-9 gcc-9-base
libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libatomic1 libbinutils
libc-dev-bin libc6-dev libcc1-0 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libfakeroot libfile-fcntllock-perl
libfl-dev libgcc-9-dev libgomp1 libisl22 libitm1 liblsan0 libmpc3 libquadmath0 libstdc++-9-dev libtsan0 libubsan1
linux-libc-dev m4 make manpages-dev zlib1g-dev
Suggested packages:
binutils-doc bison-doc cpp-doc gcc-9-locales debian-keyring flex-doc g++-multilib g++-9-multilib gcc-9-doc
gcc-multilib autoconf automake libtool gdb gcc-doc gcc-9-multilib glibc-doc bzr ncurses-doc libssl-doc
libstdc++-9-doc m4-doc make-doc
The following NEW packages will be installed:
binutils binutils-common binutils-x86-64-linux-gnu bison build-essential cpp cpp-9 dpkg-dev fakeroot flex g++ g++-9
gcc gcc-9 gcc-9-base libalgorithm-diff-perl libalgorithm-diff-xs-perl libalgorithm-merge-perl libasan5 libatomic1
libbinutils libc-dev-bin libc6-dev libcc1-0 libcrypt-dev libctf-nobfd0 libctf0 libdpkg-perl libelf-dev libfakeroot
libfile-fcntllock-perl libfl-dev libgcc-9-dev libgomp1 libisl22 libitm1 liblsan0 libmpc3 libncurses-dev libquadmath0
libssl-dev libstdc++-9-dev libtsan0 libubsan1 linux-libc-dev m4 make manpages-dev zlib1g-dev
0 upgraded, 49 newly installed, 0 to remove and 0 not upgraded.
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xxxxxxx@NUCCANYON-8:
xxxxxxx@NUCCANYON-8:
/WSL2-Linux-Kernel$ export KERNELRELEASE=4.19.84-microsoft-standard/WSL2-Linux-Kernel$ uname -axxxxxxx@NUCCANYON-8:
Linux NUCCANYON-8 5.10.16.3-microsoft-standard-WSL2 #1 SMP Fri Apr 2 22:23:49 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
Is fine to continue with version 5.1 is indicated above?