This is a bit of a weird one ...

Attempting to reproduce and fix this bug:

  https://bugzilla.kernel.org/show_bug.cgi?id=219166

which involves booting a qemu VM with the kernel and observing a
fairly rare, but reproducible hang, I'm able to reproduce this
reasonably often if I boot the Fedora-built (ie. Koji) kernel.

However when I copy /boot/config-6.11.<blah> to .config in the kernel
git tree, 'make olddefconfig', build and install it locally, then run
the test, it never seems to reproduce.  Same config, and I'm even
using the same upstream git tag.

I'm building it on Fedora Rawhide (same as Koji), so GCC and the rest
of the toolchain should be very close.

My question is, what are other differences between the Fedora-built
kernel and a locally built kernel apart from config (the same),
version (the same), and toolchain (nearly the same)?

Fedora has a downstream patch set called 'patch-6.11-redhat.patch'.
It's not clear where this comes from, but I don't think it touches any
code that should affect my test.

Other ideas welcome here as I'm out of ideas right now ...

Rich.

-- 
Richard Jones, Virtualization Group, Red Hat http://people.redhat.com/~rjones
Read my programming and virtualization blog: http://rwmj.wordpress.com
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