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[Bug ld/22831] ld causes massive thrashing if object files are not fully

From: lkcl at lkcl dot net
Subject: [Bug ld/22831] ld causes massive thrashing if object files are not fully memory-resident: new algorithm needed
Date: Wed, 16 Jan 2019 09:59:38 +0000


Luke Kenneth Casson Leighton <lkcl at lkcl dot net> changed:

           What    |Removed                     |Added
  Attachment #11522|0                           |1
        is obsolete|                            |

--- Comment #27 from Luke Kenneth Casson Leighton <lkcl at lkcl dot net> ---
Created attachment 11540
  --> https://sourceware.org/bugzilla/attachment.cgi?id=11540&action=edit
updated version of liinker torturer

i decided to run an i386 debian chroot, using a variant of
and running these options:
$python evil_linker_torture.py 80 40 20 800000000

the results of the link (an error) are below:

$ make -j8 maing
i686-linux-gnu-ld.gold src0.o src1.o src10.o src11.o src12.o src13.o src14.o
src15.o src16.o src17.o src18.o src19.o src2.o src20.o src21.o src22.o src23.o
src24.o src25.o src26.o src27.o src28.o src29.o src3.o src30.o src31.o src32.o
src33.o src34.o src35.o src36.o src37.o src38.o src39.o src4.o src40.o src41.o
src42.o src43.o src44.o src45.o src46.o src47.o src48.o src49.o src5.o src50.o
src51.o src52.o src53.o src54.o src55.o src56.o src57.o src58.o src59.o src6.o
src60.o src61.o src62.o src63.o src64.o src65.o src66.o src67.o src68.o src69.o
src7.o src70.o src71.o src72.o src73.o src74.o src75.o src76.o src77.o src78.o
src79.o src8.o src9.o -g -g -g --no-mmap-output-file --no-map-whole-files
--no-keep-files-mapped --no-keep-memory -o maing
i686-linux-gnu-ld.gold: internal error in convert_types, at

this is with the following version:
$ gold --version
GNU gold (GNU Binutils for Debian 2.28) 1.14

the most likely reason is that the size of the executable is over 6GB, and a
32-bit version of gold cannot cope.

when run on 64-bit it does fine, the only strange thing being that it still
requires 7GB of resident RAM to link a 6GB executable.

ld-bfd - with "--no-keep-memory" - only requires 750 MB of resident RAM, to
link the exact same 6GB executable.

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