[Bug 108631] Stuck on mb_cache_spinlock

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=108631

--- Comment #7 from Norman Meilick <nm@sbe.de> ---
I'm sorry for the long delay, testing took longer than expected. While we could
trigger the problem every time with kernels 3.14 to 3.18, it took 2-3 attempts
(usually about 8 hours of backing up around 2.5M files) until the spinlock
contention appeared with kernels 4.2.0 and 4.4.0-rc8.

Since applying Jan's patches to 4.4.0-rc8 we have not experienced any problems,
so it seems to us that this fixed the issue. Thank you very much to both of
you.

I'm also grateful for the advice regarding containers. On our test server we
only have six containers with a modest memory use (we made sure to monitor it
during the tests), so this likely wasn't an issue there.

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