netbsd-11 "ag" coredump after mmap()

[David Brownlee <abs%absd.org@localhost>]

Upgraded a few machines to netbsd-11 and rebuilt all packages, and
everything seems to work apart from a couple of packages which do not
build, and "ag" now dumping core in a few cases

(That is pkgsrc/textproc/the_silver_searcher)

Noticed when running against a checked out copy of netbsd-11 source
(which seems quite apt).

% ag bob crypto/external/bsd/netpgp/dist/src/netpgpverify
crypto/external/bsd/netpgp/dist/src/netpgpverify/Makefile
zsh: segmentation fault  ag bob crypto/external/bsd/netpgp/dist/src/netpgpverify

Turns out it is choking when trying to check
crypto/external/bsd/netpgp/dist/src/netpgpverify/digest-20121220.tgz

and a tail end of ktrace shows a SEGV after mapping a file

 11770  11770 ag       NAMI
"crypto/external/bsd/netpgp/dist/src/netpgpverify/digest-20121220.tgz"
 11770  11770 ag       RET   open 3
 11770  11770 ag       CALL  __fstat50(3,0x7f7fff68b790)
 11770  11770 ag       RET   __fstat50 0
 11770  11770 ag       CALL
mmap(0,0xb602,PROT_READ,0x2<PRIVATE,FILE,ALIGN=NONE>,3,0,0)
 11770  11770 ag       RET   mmap 127283549335552/0x73c382be7000
 11770  11770 ag       CALL  madvise(0x73c382be7000,0xb602,2)
 11770  11770 ag       RET   madvise 0
 11770  11770 ag       PSIG  SIGSEGV SIG_DFL: code=SEGV_MAPERR,
addr=0x73c382e28f96, trap=6)

Does anyone know offhand of anything that might have changed in this
area since -10?

Thanks

David