[Bug 195882] Local DoS from unprivileged user

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=195882

--- Comment #10 from Mark Millard <marklmi26-fbsd at yahoo.com> ---
(In reply to rozhuk.im from comment #8)

One difference in my test context and yours appears to
be that I'm not using any encryption layer but the .eli
in:

/dev/gptid/0714a812-b98e-11e8-a831-7085c2375722.eli

suggests that you are using geli-based encryption.

My context is basic, simple UFS. In my context the
I/O is fairly low latency and fairly high rate (an
SSD). So, for example, the fsync activity does not
last long. I have no experience with such issues
for geli encryption and have no clue how your I/O
subsystem latency and bandwidth might compare.

I'm also probably less likely to see the file system
try to allocate memory during its attempt to fsync
or otherwise write out dirty RAM pages (making them
clean).

All of this may make it harder for me to replicate
the behavior that you would see for the same test
program run the same way but in your context.

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