Man page database generation has been broken since the ‘core-updates’ merge it would seem:
--8<---------------cut here---------------start------------->8--- Creating manual page database... [ 1/1422] building list of man-db entries... [...] [ 65/1422] building list of man-db entries...In thread: In procedure open-file: Too many open files: "/gnu/store/85hmpisfjayarpnzbw0ma4l02nncms5q-libxtst-1.2.3/share/man/man3/XTestCompareCurrentCursorWithWindow.3.zst" In thread: In procedure open-file: Too many open files: "/gnu/store/wxwv020jwxq9gr070vwy3fh8n028gwqg-libxau-1.0.10/share/man/man3/XauDisposeAuth.3.zst" In thread: In procedure open-file: Too many open files: "/gnu/store/wxwv020jwxq9gr070vwy3fh8n028gwqg-libxau-1.0.10/share/man/man3/XauDisposeAuth.3.zst" In thread: In procedure open-file: Too many open files: "/gnu/store/wxwv020jwxq9gr070vwy3fh8n028gwqg-libxau-1.0.10/share/man/man3/XauDisposeAuth.3.zst" 349 entries processed in 0.6 s --8<---------------cut here---------------end--------------->8--- Maybe something with commit 822455580273ea8b3c1059922e2b41a395103164? Ludo’.