toolchain/51089: random crashes building arm on amd64 -current

[martin%NetBSD.org@localhost]

>Number:         51089
>Category:       toolchain
>Synopsis:       random crashes building arm on amd64 -current
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Apr 24 07:05:00 +0000 2016
>Originator:     Martin Husemann
>Release:        NetBSD 7.99.28
>Organization:
The NetBSD Foundation, Inc.
>Environment:
System: NetBSD martins.aprisoft.de 7.99.28 NetBSD 7.99.28 (GENERIC) #63: Sat Apr 23 15:19:11 CEST 2016 martin%martins.aprisoft.de@localhost:/ssd/src/sys/arch/amd64/compile/GENERIC amd64
Architecture: x86_64
Machine: amd64
>Description:

When using a -current amd64 machine to build releases for arm (eabi) I get
random crashes:

/evbarm/ssd/src/compat/arm/oabi/external/bsd/elftoolchain/lib/libelf/arm--netbsdelf-e.core
./evbarm/ssd/src/compat/arm/oabi/external/bsd/file/lib/arm--netbsdelf-e.core

file says about them:

./evbarm/ssd/src/compat/arm/oabi/external/bsd/elftoolchain/lib/libelf/arm--netbsdelf-e.core: ELF 64-bit LSB core file x86-64, version 1 (SYSV)
./evbarm/ssd/src/compat/arm/oabi/external/bsd/file/lib/arm--netbsdelf-e.core: ELF 64-bit LSB core file x86-64, version 1 (SYSV)

but gdb is unhappy:

Reading symbols from /ssd/tools/bin/arm--netbsdelf-eabi-elfedit...(no debugging symbols found)...done.
"/ssd/obj/./evbarm/ssd/src/compat/arm/oabi/external/bsd/elftoolchain/lib/libelf/arm--netbsdelf-e.core" is not a core dump: File truncated


The volume this happens on has plenty of space left.

Repeating the build (with -u) eventually gets me through.

>How-To-Repeat:
see above. Maybe aslr related?

>Fix:
n/a