[PATCH] test: py: add dry run check for FIT image

[Sascha Hauer]

On Fri, Jan 16, 2026 at 11:14:03AM +0100, Ahmad Fatoum wrote:
> A dry run should not alter system state in a way that would inhibit
> normal operation or repeated dry runs.
> 
> The FIT image boot in the test suite, however, reduces the VFS root's
> reference count beyond the initial value before the bootm.
> 
> This leads to a warning on boot that can be reproduced by repeating the
> dry run multiple times:
> 
>   FAILED test/py/test_fit.py::test_fit_dryrun -
> 	AssertionError: ['WARNING: at fs/fs.c:255/mntput()!',
> 			 'WARNING: refcount for mount "/" becomes negative']
> 
> Add a regression test for this issue.
> 
> Signed-off-by: Ahmad Fatoum <a.fatoum at barebox.org>
> ---
> @Sascha, given that you introduced the warning, maybe you are interested
> in looking into this? :-)
> I am not sure if it's 9PFS related. It's reproducible with:

No, it's not 9pfs related. It's the O_TMPFILE creation that bites us
here. I've sent a fix.

Sascha

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