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Subject: [Bug 200628] Wired memory not released after deletion from ZFS,
 kernel kills processes
Date: Thu, 04 Jun 2015 07:29:53 +0000
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X-Bugzilla-Product: Base System
X-Bugzilla-Component: kern
X-Bugzilla-Version: 10.1-STABLE
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X-Bugzilla-Severity: Affects Only Me
X-Bugzilla-Who: pascal.guitierrez@gmail.com
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=200628

            Bug ID: 200628
           Summary: Wired memory not released after deletion from ZFS,
                    kernel kills processes
           Product: Base System
           Version: 10.1-STABLE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs@FreeBSD.org
          Reporter: pascal.guitierrez@gmail.com

Seeing this behaviour on 10.1-RELEASE and 10.1-STABLE (May 26th) amd64 systems.

Systems are low-memory (2GB), but have also seen this behaviour on high (256GB)
memory systems all without swap.

10.0-RELEASE seems to NOT be affected.

How-to-repeat:
Run a system without swap and a ZFS filesystem (eg: 1TB to 2TB used).
Appears to be triggered when deleting (either through snapshots, or via regular
files) a large of amount data (hundreds of GB) (even with few files).
Wired memory skyrockets and is never reclaimed until hitting vm.v_free_min,
after which the kernel randomly kills processes to stay up.
Once this has been done, sometimes the wired memory is reclaimed, sometimes
not.
Exactly the same config on 10.0-RELEASE is not affected.

Have tried setting:
vfs.zfs.arc_max=128M (and lower)
vfs.zfs.zio.use_uma=0 (no effect)
increasing v_free_min and v_free_target = system just kills processes faster

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