Your message dated Wed, 14 Feb 2018 15:35:01 -0800
with message-id <>
and subject line make hangs when synchronizing output and redirecting to null
has caused the Debian Bug report #855336,
regarding make hangs when synchronizing output and redirecting to null
to be marked as done.

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--- Begin Message ---
Package: make
Version: 4.1-9
Severity: important

Dear Maintainer,

running the attached Makefile will hang the process,
if multiple jobs are used then the process wont respond to a
TERM and has to be killed.

The very same issue is observed with make-guile.

I believe this to not be an upstream bug, since I observed this
only a couple weeks ago after an upgrade.
Unfortunatly I can`t pinpoint a date or version.

Kind Regards, Norbert

cat >Makefile <<'EOF'
# run with
# rm -rf subdir
# make -O >/dev/null
# add -j2, then you can' t even terminate it 

FILE := a b

all: $(addprefix subdir/,$(FILE))

$(addprefix subdir/,$(FILE)):
        echo "$@"
        mkdir -p $(dir $@); touch $@

-- System Information:
Debian Release: 9.0
  APT prefers testing
  APT policy: (200, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386, armhf, arm64

Kernel: Linux 4.9.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages make depends on:
ii  libc6  2.24-9

make recommends no packages.

Versions of packages make suggests:
pn  make-doc  <none>

-- no debconf information

--- End Message ---
--- Begin Message ---

        Now make does need to treat output file writing as a critical
 region -- otherwise, parralel makes (-j N) would all stomp on each
 other and interleave letters as they write. So we need locking to make
 output redirection with ||lel makes work. There is no sane way to
 handle not waiting for a lock -- if sub makes are all trying to write,
 how would the second submake decide what to do, if it is not to wait
 for the lock?

        So I would say this is not a bug, and make is working as
 expected. The culprit here is something thaqt locks up the file that
 make expects to redirect output to (/dev/null). I suggest not doing
 that :-)

A committee is a life form with six or more legs and no brain. Lazarus
Long, "Time Enough For Love"
Manoj Srivastava <> 
4096R/C5779A1C E37E 5EC5 2A01 DA25 AD20  05B6 CF48 9438 C577 9A1C

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