國島と申します．
SWAPを無効化，メモリを極端に制限した環境で似たようなエラーを再現する事ができました．
OOM Killerに殺されていませんか? dmesg もしくは /var/log/kern.log を確認してください．
test@debian:~/git-2.25.0$ free -m total used free shared buff/cache available Mem: 227 99 22 1 106 119 Swap: 0 0 0
test@debian:~/git-2.25.0$ make man GIT_VERSION = 2.25.0 GEN perl/build/man/man3/Git.3pm make -C Documentation man make[1]: Entering directory '/home/test/git-2.25.0/Documentation' GEN mergetools-list.made GEN cmd-list.made GEN doc.dep ... 省略 ... XMLTO git-fetch-pack.1 ASCIIDOC git-config.xml XMLTO git-config.1 /usr/bin/xmlto: line 613: 1284 Killed "/usr/bin/xsltproc" --nonet --xinclude --param passivetex.extensions '1' -o "/tmp/xmlto.kE9nv6/git-config.proc" "/tmp/xmlto-xsl.PeKm0A" "/home/test/git-2.25.0/Documentation/git-config.xml" make[1]: *** [Makefile:376: git-config.1] Error 137 make[1]: Leaving directory '/home/test/git-2.25.0/Documentation' make: *** [Makefile:2502: man] Error 2
root@debian:~# dmesg | grep oom [ 69.608575] systemd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), nodemask=(null), order=0, oom_score_adj=0 [ 69.608631] oom_kill_process.cold.30+0xb/0x1cf [ 69.608635] ? oom_badness+0x23/0x140 [ 69.608838] [ pid ] uid tgid total_vm rss pgtables_bytes swapents oom_score_adj name [ 69.616222] oom_reaper: reaped process 1284 (xsltproc), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB