Broken include/asm symlink in linux-headers-2.6.32-305-ec2

[Anders Kaseorg]

The include/asm symlink in linux-headers-2.6.32-305-ec2 is broken. It points to asm-x86_64, which doesn’t exist:

$ ls -ld /usr/src/linux-headers-2.6.32-305-ec2/include/asm*
lrwxrwxrwx 1 root root 10 2010-05-06 13:58 /usr/src/linux-headers-2.6.32-305-ec2/include/asm -> asm-x86_64
lrwxrwxrwx 1 root root 50 2010-05-06 13:58 /usr/src/linux-headers-2.6.32-305-ec2/include/asm-generic -> ../../linux-headers-2.6.32-305/include/asm-generic
drwxr-xr-x 2 root root 4096 2010-05-06 13:58 /usr/src/linux-headers-2.6.32-305-ec2/include/asm-x86

This makes it impossible to build many kernel modules for ec2, such as anything that includes <linux/sched.h>:

$ cat > Makefile
obj-m = foo.o
$ cat > foo.c
#include <linux/module.h>
#include <linux/sched.h>
int init_module() { return 0; }
void cleanup_module() { }
$ make -C /lib/modules/2.6.32-305-ec2/build M=$PWD
make: Entering directory `/usr/src/linux-headers-2.6.32-305-ec2'
  CC [M] /tmp/foo/foo.o
In file included from /usr/src/linux-headers-2.6.32-305-ec2/arch/x86/include/asm/unistd.h:5,
                 from include/linux/unistd.h:7,
                 from /usr/src/linux-headers-2.6.32-305-ec2/arch/x86/include/asm/seccomp_64.h:4,
                 from /usr/src/linux-headers-2.6.32-305-ec2/arch/x86/include/asm/seccomp.h:4,
                 from include/linux/seccomp.h:8,
                 from include/linux/sched.h:80,
                 from /tmp/foo/foo.c:2:
/usr/src/linux-headers-2.6.32-305-ec2/arch/x86/include/asm/unistd_64.h:693:29: error: asm/asm-offsets.h: No such file or directory
make[1]: *** [/tmp/foo/foo.o] Error 1
make: *** [_module_/tmp/foo] Error 2
make: Leaving directory `/usr/src/linux-headers-2.6.32-305-ec2'

A real example is openafs (bug 576035).

[Anders Kaseorg (andersk)]

The same problem is also mentioned in this blog post: http://heuristically.wordpress.com/2010/05/05/error-asmasm-offsets-h-no-such-file-directory/

[DooMMasteR (winrootkit)]

wohoo got the same problem here -.- dkms for vbox e.g. fails

[Jean-Philippe Roberge (jproberge)]

Same problem here! I had to create symbolic links to fix that. I'm running Kernel 3.5.0-42-generic