Windows build failure tracking issue

[dra27]

Three kinds of failures (so far):

docker-build exit-code 1

docker-build failed with exit-code 1, but nothing appears to have gone wrong.

So far this is only happening with 1809 images.

Date	Worker	Job
2021-07-08	Altair	windows-mingw-1809-ocaml-4.03-amd64@c3e374a6f
2021-07-08	Alpha-Ceti	windows-mingw-1809-ocaml-4.02-amd64@c3e374a6f
2021-07-09	Altair	windows-mingw-1809-ocaml-4.03-amd64@c3e374a6f
2021-07-15	Altair	windows-mingw-1809-opam-amd64@9e1c54e26c
2021-07-22	Alpha-Ceti	windows-mingw-1809-ocaml-4.04-amd64@a63cf4c323
2021-07-22	Alpha-Ceti	windows-mingw-1809-ocaml-4.05-amd64@a63cf4c323
2021-07-30	Altair	windows-mingw-1809-opam-amd64@85f9e4e7d0
2021-08-04	Altair	windows-mingw-1809-ocaml-4.02-amd64@15b960df7f
2021-08-04	Altair	windows-mingw-1809-ocaml-4.02-amd64@15b960df7f
2021-08-04	Altair	windows-mingw-1809-ocaml-4.04-amd64@15b960df7f
2021-08-04	Altair	windows-mingw-1809-ocaml-4.02-amd64@15b960df7f
2021-08-06	Altair	windows-mingw-1809-ocaml-4.03-amd64@15b960df7f
2021-08-11	Alpha-Ceti	windows-msvc-1809-opam-amd64@4f39fa3570
2021-08-11	Altair	[windows-mingw-1809-ocaml-4.05-amd64@4f39fa3570]https://images.ci.ocaml.org/job/2021-08-11/125109-ocluster-build-93b0cf
2021-08-11	Altair	windows-mingw-1809-ocaml-4.07-amd64@4f39fa3570
2021-08-18	Altair	windows-mingw-1809-ocaml-4.03-amd64@06ccd7c531
2021-08-18	Altair	windows-mingw-1809-ocaml-4.04-amd64@06ccd7c531
2021-08-25	Altair	windows-mingw-1809-opam-amd64@46ec1e714b

Cygwin Fork

Errors of the form:

child_info_fork::abort: \??\C:\cygwin64\bin\cygssl-1.1.dll: Loaded to different address: parent(0x3FE3A0000) != child(0x400000)

Date	Worker	DLL	Job
2021-07-08	Altair	cygssl	windows-mingw-2004-ocaml-4.05-amd64@c3e374a6f
2021-07-15	Alpha-Ceti	cygssl	windows-mingw-2004-ocaml-4.02-amd64@9e1c54e26c
2021-07-22	Alpha-Ceti	cygssl	windows-mingw-1909-ocaml-4.09-amd64@a63cf4c323
2021-07-22	Alpha-Ceti	cygssl	windows-mingw-1909-ocaml-4.09-amd64@a63cf4c323
2021-07-30	Alpha-Ceti	cygcrypto	windows-mingw-1909-ocaml-4.03-amd64@85f9e4e7d0
2021-08-04	Altair	cygssl	windows-mingw-2004-ocaml-4.09-amd64@15b960df7f
2021-08-04	Altair	cygcrypto	windows-mingw-2004-ocaml-4.11-amd64@15b960df7f
2021-08-06	Alpha-Ceti	cygssl	windows-mingw-2004-ocaml-4.08-amd64@15b960df7f
2021-08-11	Altair	cygssl	windows-mingw-20H2-ocaml-4.04-amd64@4f39fa3570
2021-08-11	Alpha-Ceti	cygcrypto	windows-mingw-2004-ocaml-4.05-amd64@4f39fa3570
2021-08-18	Alpha-Ceti	cygssl	windows-mingw-2004-ocaml-4.07-amd64@06ccd7c531

C compiler / assembler failures

These may well be related to the fork problem, but stderr is being masked (either by gcc or by OCaml).

For C files, gcc is failing without giving any error message; for OCaml files, ocamlopt is giving the "Assembler error, input left in" message.

Date	Worker	Job	Source
2021-07-08	Altair	windows-mingw-2004-ocaml-4.06-amd64@c3e374a6f	middle_end\inlining_decision.ml
2021-07-08	Altair	windows-mingw-1909-ocaml-4.09-amd64@c3e374a6f	otherlibs\win32unix\getserv.c
2021-07-09	Altair	windows-mingw-1909-ocaml-4.09-amd64@c3e374a6f	bytecomp\bytesections.ml
2021-07-29	Alpha-Ceti	windows-mingw-1909-ocaml-4.05-amd64@85f9e4e7d0	middle_end/alias_analysis.ml
2021-07-30	Altair	windows-mingw-2004-ocaml-4.08-amd64@85f9e4e7d0	runtime/sys.c
2021-08-06	Altair	windows-mingw-1809-ocaml-4.09-amd64@15b960df7f	ocamltest/ocamltest_stdlib_stubs.c
2021-08-18	Alpha-Ceti	windows-mingw-1809-ocaml-4.11-amd64@06ccd7c531	flexlink unable to find flexdll_mingw64.o linking ocamlrun.exe