In my case, for a simple process trace (from utrace/uprobe):
sudo stap -e 'probe process("ls").function("*").call { log
(probefunc()." ".$$parms) }' -c 'ls -l'
Generates:
http://pastebin.ubuntu.com/24414785/
And you can clearly see incompatibility between systemtap runtime (used
to create stap kernel modules):
----
static int
__access_process_vm_ (struct task_struct *tsk, unsigned long addr, void *buf,
int len, int write,
void (*writer) (struct vm_area_struct * vma,
struct page * page, unsigned long vaddr,
void *dst, void *src, int len),
void (*reader) (struct vm_area_struct * vma,
struct page * page, unsigned long vaddr,
void *dst, void *src, int len))
{
...
ret = get_user_pages (tsk, mm, addr, 1, write, 1, &page, &vma);
and kernel we're running in, with function prototypes declared at:
"/usr/src/linux-headers-4.8.0-48/include/linux/mm.h" as:
long get_user_pages(unsigned long start, unsigned long nr_pages,
int write, int force, struct page **pages,
struct vm_area_struct **vmas);
----
IMO, HWE kernels should be followed with new systemtap userland
packages, for every HWE kernel release, specially for LTS versions.
By backporting yakkety systemtap I got everything working:
ii systemtap 3.0-7
amd64 instrumentation system for Linux
ii systemtap-common 3.0-7
all instrumentation system for Linux (common component)
ii systemtap-doc 3.0-7
all documentation and examples for SystemTap
ii systemtap-runtime 3.0-7
amd64 instrumentation system for Linux (runtime component)
http://pastebin.ubuntu.com/24414866/
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https://bugs.launchpad.net/bugs/1683876
Title:
systemtap doesn't works on xenial with kernels > 4.4
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