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https://bugs.launchpad.net/bugs/1886814
Title:
posix_spawn usage in gnu make causes failures on s390x
Status in Ubuntu on IBM z Systems:
New
Status in glibc package in Ubuntu:
New
Status in linux package in Ubuntu:
Incomplete
Status in make-dfsg package in Ubuntu:
New
Bug description:
posix_spawn usage in gnu make causes failures on s390x
Recently in gnu-make v4.3 https://paste.ubuntu.com/p/tYhbJFKN76/ it
started to use posix_spawn, instead of fork()/exec().
This has caused failure of an unrelated package flatpak-builder
autopkgtests on s390x only, like so
echo Building
make: echo: Operation not permitted
make: *** [Makefile:2: all] Error 127
Julian Klaude investigated this in-depth. His earlier research also
indicated that this is a heisenbug, if one tries to print to stderr
before printing to stdout, no issue occurs.
We are configuring GNU make to be build with --disable-posix-spawn on
s390x only. We passed these details to Debian https://bugs.debian.org
/cgi-bin/bugreport.cgi?bug=964541 too.
But I do wonder, if there is something different or incorrect about
posix_spawn() implementation in either glibc, or linux kernel, on
s390x. Or gnu-make's usage of posix_spawn().
As otherise, using posix_spawn() in gnu-make works on other
architectures, and flatpak-builder autopkgtests pass too.
It seems very weird that stdout does not appear to be functional,
unless stderr was opened/written to, from gnu-make execution compiled
with posix-spawn feature.
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