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Subject: [Bug 197842] kernel memory leak
Date: Fri, 20 Feb 2015 07:57:32 +0000
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X-Bugzilla-Severity: Affects Only Me
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=197842

            Bug ID: 197842
           Summary: kernel memory leak
           Product: Base System
           Version: 10.0-RELEASE
          Hardware: i386
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: ota@j.email.ne.jp

After process exits, kernel memory isn't released in some cases and that
results failures on new process creations.  The problem seems to be also
hardware dependent as I only see this happening on only one of three machines I
tested.

This started happening since 10.0-RELEASE and see it on 10.1-RELEASE as well. 
11-CURRENT does not have this issue.

When the problem occurs, I see one of these 2 errors printed:

pmap_mapdev: Couldn't alloc kernel virtual memory
vm_thread_new: kstack allocation failed

One of the easiest way to reproduce the problem is by benchmarks/forkbomb.
% forkbomb -f

https://svnweb.freebsd.org/base?view=revision&revision=272667 seemed somewhat
similar problem but code base is quite different on 10-stalbe and 11-current.

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