libkrun is failing to run microvm on fedora42/43 #519
Description
podman exec -it qm podman run --runtime=krun --rm -it alpine echo 'Hello libkrun.'
This job is part of QM CI.
[2026-01-22T05:38:44Z ERROR krun] Building the microVM failed: Internal(Vm(CreateGuestMemfd(Error(13))))
{"msg":"exec container process failed with handler as krun: Invalid argument","level":"error","time":"2026-01-22T05:38:44.332957Z"}
[ FAILED ] Error executing command 'podman exec -it qm podman run --runtime=krun --rm -it alpine echo 'Hello libkrun.'' with exit code: 1
How to reproduce fedora43
uname -r
6.18.5-200.fc43.x86_64
podman-5.7.1-1.fc43.x86_64
libkrunfw-4.10.0-2.fc43.x86_64
libkrun-1.15.1-1.fc43.x86_64
crun-krun-1.25.1-1.fc43.x86_64
Note:
I tried also krunvm, same problem, Is it related to memfd?
krunvm-0.1.6-11.fc43.x86_64
More info
strace -f -e ioctl podman run --runtime=krun --security-opt label=disable --rm -it alpine echo "Hello" 2>&1 | grep -i kvm | cut -d" " -f1-7
[pid 340658] ioctl(9, KVM_GET_API_VERSION, 0) = 12
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_IRQCHIP) = 1
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_IOEVENTFD) = 1
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_IRQFD) = 1
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_USER_MEMORY) = 1
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR) = 1
[pid 340658] ioctl(9, KVM_CHECK_EXTENSION, KVM_CAP_NR_MEMSLOTS) = 32764
[pid 340658] ioctl(9, KVM_CREATE_VM, 0) = 10
[pid 340658] ioctl(9, KVM_GET_VCPU_MMAP_SIZE, 0) = 12288
[pid 340658] ioctl(9, KVM_GET_SUPPORTED_CPUID, {nent=58, entries=[...]}) =
[pid 340658] ioctl(9, KVM_GET_MSR_INDEX_LIST, 0x55ce0ab43f30) = 0
[pid 340658] ioctl(10, KVM_CHECK_EXTENSION, KVM_CAP_GUEST_MEMFD) = 1
[pid 340658] ioctl(10, KVM_CREATE_GUEST_MEMFD, 0x7ffc55e7fbf0) = 11
[pid 340658] ioctl(10, KVM_SET_USER_MEMORY_REGION2, 0x7ffc55e7fb50) = 0
[pid 340658] ioctl(10, KVM_SET_MEMORY_ATTRIBUTES, 0x7ffc55e7fc38) = -1
Build also
./chroot_vm / /bin/sh
[2026-01-25T13:37:45Z ERROR krun] Building the microVM failed: Internal(Vm(SetMemoryAttributes(Error(22))))
Error creating the microVM: Invalid argument