[Bug 256712] UFS: kernel panic: ffs_blk free_cg: freeing free frag – in response to pkg-delete(8) soon after login

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=256712

--- Comment #5 from Graham Perrin <grahamperrin@gmail.com> ---
(In reply to Kirk McKusick from comment #3)

> When you say you were using `automated filesystem checks' 
> were the runs of fsck being done before booting multi-user or 
> were they being done in background after the system started running?

Here's where I admit to not properly understanding some of what's under
<https://docs.freebsd.org/en/books/handbook/config/#soft-updates> and (unless
I'm missing something) the history there touches upon journaling _but not_
journaled soft updates. 

The simplest answer to the question might be that (for tests of this nature) I
would never manually exit to multi-user mode without seeing an explicit message
confirming a mark of cleanliness. 

If there's the mark of cleaniness for a particular file system 
– in this case, / 
– and if the mark results from an automated fsck that precedes automated
progress to multi-user mode – then will a background check occur (for this file
system) regardless of the mark?

Here's where I take particular interest in comments at and under bug 255799
comment 2. 

Other questions bubbling under but for now, I'll can them … and I feel that I
haven't properly answered your question (because I'm not certain of the
answer). Sorry.

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