[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 #12 from Gary Jennejohn <gljennjohn@gmail.com> ---
(In reply to Graham Perrin from comment #11)
This reminds me of a kernel panic which I saw and reported on.
I was asked to add INVARIANTS and DEBUG=-O0 to my kernel config file to get
better backtraces.  Since I already had makeoptions DEBUG=-g, I actually added
makeoptions DEBUG+=-O0 to get both -g and -O0 in the compiler flags.
As one can see in your backtrace, parts of the kernel were optimized out.  The
-O0 assures that no optimization is done.
That will produce better backtrace.
For INVARIANTS I added options INVARIANTS and options INVARIANT_SUPPORT.
So, if you can easily reproduce the panic I recommend adding these to your
kernel config file and then rerunning your test.

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