[Bug 219457] ZFS ARC eviction & system hangup

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=219457

--- Comment #13 from Anton Sayetsky <vsasjason at gmail.com> ---
(In reply to Fabian Keil from comment #6)

> The procstat output suggests that you might be using geli for the swap device.
Yes, you're right. I'm using GELI (AES-256-XTS/SHA256/onetime) over gmirror of
2 gpt partitions.

> This is known to cause deadlocks under memory pressure:
> https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209759
Disabled GELI swap & stopped relevant gmirror -- still got ARC eviction after
running tar...

> You could reduce vfs.zfs.deadman_synctime_ms to more quickly get a panic when the system becomes unresponsive.
Unfortunately, I cannot see any panics (and thus, stack traces). System just
hangs w/o any output to logs or console, and all that I can do - reset or power
cycle through IPMI interface. I'm thinking about compiling kernel with KDB/DDB
and collecting coredump with NMI.

> It would probably help to see the counters in vm_cnt.
Attached relevant sysctl output & similar diagnostics as before, but w/o swap.

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