PDF builds broken again

It seems at least the 9.0 PDFs are broken (trying to build for the release):

Lots of errors/warnings (and AFAIK no way to see which is which in the
output), but It hink this is the telltale as usual:

Overfull \hbox (7.12454pt too wide) in paragraph at lines 88092--88092
[]\T1/pcr/m/n/9 CREATE FUNCTION getf1(myrowtype) RETURNS int AS 'SELECT $1.f1'
LANGUAGE SQL;[]
[]
....
and many more like it until
....
Overfull \hbox (1.59999pt too wide) in alignment at lines 241488--241741
[] [] []
[]

[256.0.1
! pdfTeX error (ext4): \pdfendlink ended up in different nesting level than \pd
fstartlink.
\AtBegShi(at)Output ...ipout \box \AtBeginShipoutBox
\fi \fi
l.241875 ...char95{}stat\char95{}file('filename');

Here is how much of TeX's memory you used:
22467 strings out of 482156
171125 string characters out of 3785924
308594 words of memory out of 3085000
27304 multiletter control sequences out of 15000+500000
80861 words of font info for 131 fonts, out of 3000000 for 9000
14 hyphenation exceptions out of 8191
30i,12n,43p,307b,1338s stack positions out of 1500i,500n,1500p,200000b,50000s
! ==> Fatal error occurred, no output PDF file produced!

Do we actually have any buildfarm boxes building the PDFs? And if so,
any idea why they didn't catch it?

Do we have a reasonable way to figure out which commit actually broke
it, other than manually testing backing out each of the 11 commits
since 9.0.17?

--
Magnus Hagander
Me: http://www.hagander.net/
Work: http://www.redpill-linpro.com/