[Bug 266656] crash system with thunderbird

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266656

Graham Perrin <grahamperrin@freebsd.org> changed:

           What    |Removed                     |Added
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             Status|New                         |Open
                 CC|                            |grahamperrin@freebsd.org

--- Comment #6 from Graham Perrin <grahamperrin@freebsd.org> ---
(In reply to Gian-Simon Purkert from comment #0)

kern.ipc.shm_use_phys

From tuning(7)
<https://www.freebsd.org/cgi/man.cgi?query=tuning&sektion=7&manpath=FreeBSD>: 

> The kern.ipc.shm_use_phys sysctl defaults to 0 (off) and may be set to 0 (off)
> or 1 (on).  Setting this parameter to 1 will cause all System V shared memory
> segments to be mapped to unpageable physical RAM.  This feature only has an
> effect if you are either (A) mapping small amounts of shared memory across
> many (hundreds) of processes, or (B) mapping large amounts of shared memory
> across any number of processes.  This feature allows the kernel to remove a
> great deal of internal memory management page-tracking overhead at the cost of
> wiring the shared memory into core, making it unswappable.

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