> Is it possible arm64 abi is different from armhf (32bit?)

ah, that was it, thanks, I can reproduce it now :)

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https://bugs.launchpad.net/bugs/1840640

Title:
  sync_file_range fails in nspawn containers on arm, ppc

Status in systemd package in Ubuntu:
  Fix Released
Status in systemd source package in Bionic:
  In Progress
Status in systemd source package in Disco:
  In Progress

Bug description:
  ARM has two sync_file_range syscalls, sync_file_range and
  sync_file_range2. The former is apparently not used, and glibc calls
  the latter whenever a userspace program calls sync_file_range. I'm
  guessing systemd-nspawn doesn't know this, because the follow code
  consistently fails in an nspawn container on ARM:

  #define _GNU_SOURCE
  #include <fcntl.h>
  #include <unistd.h>
  #include <stdio.h>
  #include <errno.h>

  void main()
  {
          int f = open("/tmp/syncrange.test",O_CREAT|O_RDWR,0666);
          int r=sync_file_range(f, 0, 0, 0);
          if (r)
                  perror("sync_file_range");
          close(f);
  }

  This seems to be causing problems specifically for borg(backup) and
  postgres:

  https://github.com/borgbackup/borg/issues/4710
  
https://www.postgresql.org/message-id/flat/CA%2BhUKG%2BydOUT4zjxb6QmJWy8U9WbC-q%2BJWV7wLsEY9Df%3Dmw0Mw%40mail.gmail.com#ac8f14897647dc7eae3c7e7cbed36d93

  The solution should be to cherrypick
  https://github.com/systemd/systemd/pull/13352, I am currently waiting
  for systemd to rebuild on a slow ARM box. Any chance of an SRU?

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: systemd-container 237-3ubuntu10.24
  Uname: Linux 4.14.66+ armv7l
  NonfreeKernelModules: extcon_usb_gpio
  ApportVersion: 2.20.9-0ubuntu7.7
  Architecture: armhf
  Date: Mon Aug 19 11:10:48 2019
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: systemd
  UpgradeStatus: No upgrade log present (probably fresh install)

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