Go builds failing on mips64el

go builds (dh_auto_build invoking /usr/bin/go -> golang-1.12-go) are 
failing consistently on mip64el.  I'm seeing the error in 
golang-github-anacrolix-dms and rclone but I think other packages are 
affected.

All builds fail on mip64el.  mipsel is also intermittently affected, but 
a giveback gets a successful build.  The mipsel pattern suggests that 
builds fail on mipsel-manda-03, while succeeding on eberlin and 
mipsel-aql-01.

The package providing /usr/lib/go-1.12/bin/go, golang-1.12-go 
(golang-1.12), built successfully 25 days ago.

dms logs are at 
https://buildd.debian.org/status/logs.php?pkg=golang-github-anacrolix-dms&arch=mips64el
e.g. 
https://buildd.debian.org/status/fetch.php?pkg=golang-github-anacrolix-dms&arch=mips64el&ver=1.0.0-2&stamp=1568632405&raw=0

Log snippets:
    dh_auto_build -a -O--buildsystem=golang
signal 10 received but handler not on signal stack
fatal error: non-Go code set up signal handler without SA_ONSTACK flag

runtime stack:
runtime: unexpected return pc for runtime.sigtramp called from 
0xffffee4560
stack: frame={sp:0xc000009c88, fp:0xc000009cd0} 
stack=[0xc000001be8,0xc000009fe8)
000000c000009b88:  000000c000000480  0000000120037ad4 
<runtime.throw+108>
000000c000009b98:  000000c000009ba0  000000012005380c 
<runtime.sigNotOnStack+172>
000000c000009ba8:  000000c000009bb0  0000000120069a50 
<runtime.throw.func1+0>
000000c000009bb8:  000000012065dd02  0000000000000039
000000c000009bc8:  0000000120052a44 <runtime.sigtrampgo+700>  
000000012065dd02
000000c000009bd8:  0000000000000039  000000012006e4cc 
<runtime.sigtramp+84>
...
runtime.sigtramp(0x0, 0x0, 0x800000000a, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 
0x0, ...)
	/usr/lib/go-1.12/src/runtime/sys_linux_mips64x.s:254 +0x54

goroutine 17 [syscall, locked to thread]:
runtime.goexit()
	/usr/lib/go-1.12/src/runtime/asm_mips64x.s:646 +0x4 fp=0xc000058fe0 
sp=0xc000058fe0 pc=0x12006da1c

goroutine 1 [running, locked to thread]:
	goroutine running on other thread; stack unavailable

goroutine 20 [syscall]:
os/signal.signal_recv(0x0)
	/usr/lib/go-1.12/src/runtime/sigqueue.go:139 +0x150
os/signal.loop()
	/usr/lib/go-1.12/src/os/signal/signal_unix.go:23 +0x34
created by os/signal.init.0
	/usr/lib/go-1.12/src/os/signal/signal_unix.go:29 +0x54
	cd obj-mips64el-linux-gnuabi64 && go install 
-gcflags=all=\"-trimpath=/<<PKGBUILDDIR>>/obj-mips64el-linux-gnuabi64/src\" 
-asmflags=all=\"-trimpath=/<<PKGBUILDDIR>>/obj-mips64el-linux-gnuabi64/src\" 
-v -p 4
dh_auto_build: cd obj-mips64el-linux-gnuabi64 && go install 
-gcflags=all=\"-trimpath=/<<PKGBUILDDIR>>/obj-mips64el-linux-gnuabi64/src\" 
-asmflags=all=\"-trimpath=/<<PKGBUILDDIR>>/obj-mips64el-linux-gnuabi64/src\" 
-v -p 4 died with signal 10
make: *** [debian/rules:4: build-arch] Error 255
dpkg-buildpackage: error: debian/rules build-arch subprocess returned 
exit status 2


Is the bug already known and understood, or should a bug be filed 
against golang-1.12?
Or does golang-1.12 just need a rebuild against glibc 2.29 or something 
?

Drew