错误：无法mmap文件：vmlinux

Question

In a newly installed virtual machine I get this error when compiling the kernel for the x86 architecture:

$ Could not mmap file: vmlinux

$ make: *** [vmlinux] Error 1

It is the first time I see it. I have increased the size of /proc/sys/kernel/shmmax to 128MB, but it does not solve the issue. Any ideas?

Thanks! :)

Answer 1

I had the same issue when compiling kernel in virtual box shared folder. Error comes from mmap_file() function in source file scripts/sortextable.c . Moreover, all mmap functions failed with errno EINVAL within shared folder.

I fixed it with copying linux sources into non shared folder like /home/Name/linux and compiled there.

Answer 2

I had the same problem compiling linux kernel on the VirtualBox shared folder here and I make a little fix in the function sortextable at line 104 (+/-) of script link-vmlinux.sh localized in scripts/ directory

I change this:

sortextable()
{
        ${objtree}/scripts/sortextable ${1}        
}

for this:

sortextable()
{
    cp ${1} /tmp/.${1}
    scripts/sortextable /tmp/.${1}
    cp /tmp/.${1} ${1}
}

And works for me!