https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219457
Bug ID: 219457
Summary: ZFS ARC eviction & system hangup
Product: Base System
Version: 10.3-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: freebsd-bugs@FreeBSD.org
Reporter: vsasja...@gmail.com
I have a machine with 256 GiB of RAM (249 GiB managed) that serves files over
plain HTTP with nginx & AIO.
After system starup ARC grows to its maximum size - ~233 GiB (so about ten gigs
are always free), then it slightly drops down to ~228 GiB. Only after that if I
start some processes:
1. They will immediately hang in "D" state;
2. pagedaemon/uma enters clearing state;
3. ARC starts to evict till its minimum size;
4. When ARC reaches minimum entire system becomes unresponsive with a delay
(from 5 mins to 8 hours).
Some examples of hanging processes:
1. conftest when building devel/m4 (PR in "See Also");
2. tar on any directory, e.g. tar cvf /dev/null /usr/ports.
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