https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=282449
Bug ID: 282449
Summary: UFS deadlock with install -C during freebsd-update
Product: Base System
Version: Unspecified
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 254825
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=254825&action=edit
procstat -kka on the system with hung sync and install process
I have experienced deadlock requiring reset a couple of times during
freebsd-update. The install -C command gets stuck in wdrain. A sync executed
at this time also never returns.
I found a thread on forums.freebsd.org which seems to be the same problem,
however it also seems to be implicated in extremely slow freebsd-update when
the filesystem is ZFS.
https://forums.freebsd.org/threads/freebsd-13-2-release-14-0-release-upgrade-stuck.91152/
I eventually was able to reproduce the problem and get a procstat -kka, which
is attached. I can not say that it is reproducible on demand, but I can
certainly try if additional debug is needed. This was about my 30th try, and
the last change was going sync=standard(prior disabled) on the underlying host
ZFS.
This was on 13.3-p7, going to 13.4-RELEASE. However, it has been experienced
under other kernels earlier and later for the past year. It seems to be
hardware independent, and I have run into it on a couple of VMs, and a VPS with
varying cpu count and disk controllers. This particular case is VirtualBox
6.1.50, 1 cpu, ahci, on top of a ZFS with sync=standard and no hostiocache in
vbox. Hostsystem is same kernel, on ahci supermicro with spinner.
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