`configure --disable-tables-next-to-code` + `default+debug_info` = linking errors

If I run:

./boot
./configure --disable-tables-next-to-code
hadrian/build --flavour=default+debug_info

I get:

/tmp/ghc452698_0/ghc_3.s: Assembler messages:

/tmp/ghc452698_0/ghc_3.s:193:0: error:
     Error: symbol `.Lck_end' is already defined
    |
193 | .Lck_end:
    | ^

/tmp/ghc452698_0/ghc_3.s:194:0: error:
     Error: symbol `.Lck_proc_end' is already defined
    |
194 | .Lck_proc_end:
    | ^
`cc' failed in phase `Assembler'. (Exit code: 1)
Command failed
Build failed.

Whereas I expect a compiler with DWARF enabled and no tables next to code. Why does this matter? Because I was trying to re-assess the performance of TNTC and I want DWARF symbols so that in perf I can gen annotated assembly.

...or...is this just expected behavior?