null_vptocnp(): busy nullfs mp instead of refing it
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Authored by kib on Jun 14 2022, 4:35 AM.

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pho

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markj
jah

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rG7fd37611b92b: null_vptocnp(): busy nullfs mp instead of refing it

Summary

null_nodeget() needs a valid mount point data, otherwise we might
race and dereference NULL.

Using MBF_NOWAIT makes non-forced unmount non-transparent for
vn_fullpath() over nullfs, but we make no guarantee that fullpath
calculation succeeds anyway.

Reported and tested by:    pho