[Bug 261181] 13-STABLE hang: swap_pager: indefinite wait buffer

From: <bugzilla-noreply_at_freebsd.org>
Date: Sat, 15 Jan 2022 16:56:10 UTC

--- Comment #14 from ldoujin <lnx.doujin@gmail.com> ---
(In reply to tech-lists from comment #12)

/tmp is on the same geli-encrypted array as the rest of the OS.

A few more data points:
- Cloning new tree from https = no bug
- Cloning new tree from ssh = no bug
- Updating tree from ssh = bug

The ports directory is mounted with zstd compression, while /tmp is mounted
with no compression. I tried switching the ports directory to lz4 and no
compression, but the bug still happened with git pull in both cases.

As I understand it, ZFS may still actually be using the previous compression
for reading existing files, so "disabling" it might not have fully disabled it.
Either way, the compression is probably worth mentioning.

I don't want to delete the problematic tree yet because then the bug may not
get found and fixed. Something is still broken that's provably not broken in a
kernel from September.

(In reply to Andriy Gapon from comment #13)

I'm not familiar with vmstat, but here is its -z output on a fresh boot:


And during the rapid wired memory inflation:


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