[Bug runtime/22155] kernel panic due to NULL vma_cache_p->f_path.dentry

["dsmith at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=22155

--- Comment #3 from David Smith <dsmith at redhat dot com> ---
(In reply to Tetsuo Handa from comment #2)
> > But, when that function gets called, the task is stopped.
> > So, hopefully the task->mm won't be changing while the task is stopped.
> 
> Java is a multi-threaded process.
> Are all threads stopped when that function gets called?

No, all threads aren't stopped. But, each userspace thread is represented by a
task structure in the kernel.

> > Can you show us the script that caused this panic?
> 
> I don't have the script right now (I need to ask permission for disclosure).
> But the script hooks Java methods using java().class().method() and file
> opens.
> Guru mode is not used.
> 
> > Is this panic intermittent or does it happen every time?
> 
> So far only once, while running stability test for 8 hours.

Unless you can get us a reproducer, debugging becomes quite difficult.

-- 
You are receiving this mail because:
You are the assignee for the bug.