Questions[glibc](ubuntu)

I'm trying to install PyTorch on ARMv7(32-bit) architecture but PyTorch doesn’t have official ARMv7 builds so i tried this unofficial build.

It installed successfully but when I import torch I get the following error

import torch
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/local/lib/python3.7/site-packages/torch/__init__.py", line 81, in <module>
    from torch._C import *
ImportError: /lib/arm-linux-gnueabihf/libc.so.6: version `GLIBC_2.28' not found (required by /usr/local/lib/python3.7/site-packages/torch/lib/libtorch_python.so)

I tried the following

sudo apt-get update
sudo apt-get install libc6

but it seams that I have the newest version of libc6

Reading package lists... Done
Building dependency tree       
Reading state information... Done
libc6 is already the newest version (2.23-0ubuntu11).
The following packages were automatically installed and are no longer required:
  busybox-initramfs cpio initramfs-tools initramfs-tools-bin initramfs-tools-core klibc-utils libdbusmenu-gtk4 libklibc
  libllvm3.8 libmircommon5 linux-base
Use 'sudo apt autoremove' to remove them.
0 upgraded, 0 newly installed, 0 to remove and 10 not upgraded.

So is it possible to install GLIBC_2.28 on my machine?

Here is my GLIBCXX and GLIBC versions that i have:

strings /usr/lib/arm-linux-gnueabihf/libstdc++.so.6 | grep GLIBC
GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_3.4.22
GLIBCXX_3.4.23
GLIBCXX_3.4.24
GLIBCXX_3.4.25
GLIBCXX_3.4.26
GLIBCXX_3.4.27
GLIBCXX_3.4.28
GLIBC_2.4
GLIBC_2.6
GLIBC_2.18
GLIBC_2.16
GLIBC_2.17

Ldd version:

ldd --version

ldd (Ubuntu GLIBC 2.23-0ubuntu11) 2.23
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Written by Roland McGrath and Ulrich Drepper.

My OS:

cat /etc/os-release
NAME="Ubuntu"
VERSION="16.04.6 LTS (Xenial Xerus)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 16.04.6 LTS"
VERSION_ID="16.04"
HOME_URL="http://www.ubuntu.com/"
SUPPORT_URL="http://help.ubuntu.com/"
BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
VERSION_CODENAME=xenial
UBUNTU_CODENAME=xenial

I realize there are many questions like this, but the difference from the others is that my libstdc++.so.6 actually does appear to be up to date enough (see below for the strings it exports). This is an error that comes up when trying to load a dynamic library that i just compiled myself. apt-get upgrade and the like tell me libstdc++.so.6 already is up to date (on version libstdc++6 is already the newest version (9.1.0-2ubuntu2~18.04)).

Full error i get when loading this library (in MATLAB R2019a):

'/home/dee/git_repos/Titta/TobiiMex/TobiiMex_matlab/64/TobiiMex_matlab.mexa64':
/usr/lib/x86_64-linux-gnu/libstdc++.so.6: version `GLIBCXX_3.4.26' not found (required by
/home/dee/git_repos/Titta/TobiiMex/TobiiMex_matlab/64/TobiiMex_matlab.mexa64)

output of strings /usr/lib/x86_64-linux-gnu/libstdc++.so.6 | grep GLIBC:

GLIBCXX_3.4
GLIBCXX_3.4.1
GLIBCXX_3.4.2
GLIBCXX_3.4.3
GLIBCXX_3.4.4
GLIBCXX_3.4.5
GLIBCXX_3.4.6
GLIBCXX_3.4.7
GLIBCXX_3.4.8
GLIBCXX_3.4.9
GLIBCXX_3.4.10
GLIBCXX_3.4.11
GLIBCXX_3.4.12
GLIBCXX_3.4.13
GLIBCXX_3.4.14
GLIBCXX_3.4.15
GLIBCXX_3.4.16
GLIBCXX_3.4.17
GLIBCXX_3.4.18
GLIBCXX_3.4.19
GLIBCXX_3.4.20
GLIBCXX_3.4.21
GLIBCXX_3.4.22
GLIBCXX_3.4.23
GLIBCXX_3.4.24
GLIBCXX_3.4.25
GLIBCXX_3.4.26
GLIBC_2.2.5
GLIBC_2.3
GLIBC_2.14
GLIBC_2.6
GLIBC_2.4
GLIBC_2.18
GLIBC_2.16
GLIBC_2.3.4
GLIBC_2.17
GLIBC_2.3.2
GLIBCXX_DEBUG_MESSAGE_LENGTH

What can i try to fix this?

The building of tarball releases of GNU m4 1.4.10 to 1.4.18 (didn't test all hotfix versions, but I assume the error is consistent among this range) with ./configure && make -j1 and git git repository http://git.savannah.gnu.org/r/m4.git with ./bootstrap && ./configure && make -j1 (commit cvs-readonly-359-gd69fa528 i.e. HEAD of master) fails due to

freadahead.c: In function 'freadahead':
freadahead.c:92:3: error: #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
  #error "Please port gnulib freadahead.c to your platform! Look at the definition of fflush, fread, ungetc on your system, then report this to bug-gnulib."
   ^~~~~
make[3]: *** [Makefile:1910: freadahead.o] Error 1
make[3]: Leaving directory '/mnt/data/sources/m4-1.4.18/lib'

I'm very confused by this error and according to a superficial google search the problem is the consequence of an overly long ignored upstream update, see e.g. https://bugzilla.redhat.com/show_bug.cgi?id=1573342 with the genius documentation of the fix "Thanks for the bug report, fixed!" - if that doesn't help others...

I tried to build glibc from source and install it into a custom prefix[1]. 2.28 and 2.27 exhibit the same issue and 2.26 fails due to

make[2]: Verzeichnis „/mnt/data/sources/glibc-2.26/inet“ wird betreten
gcc ../sysdeps/unix/sysv/linux/if_index.c -c -std=gnu11 -fgnu89-inline  -O2 -Wall -Werror -Wundef -Wwrite-strings -fmerge-all-constants -fno-stack-protector -frounding-math -g -Wstrict-prototypes -Wold-style-definition     -ftls-model=initial-exec   -U_FORTIFY_SOURCE   -I../include -I/mnt/data/sources/glibc-2.26-build/inet  -I/mnt/data/sources/glibc-2.26-build  -I../sysdeps/unix/sysv/linux/x86_64/64  -I../sysdeps/unix/sysv/linux/x86_64  -I../sysdeps/unix/sysv/linux/x86  -I../sysdeps/x86/nptl  -I../sysdeps/unix/sysv/linux/wordsize-64  -I../sysdeps/x86_64/nptl  -I../sysdeps/unix/sysv/linux/include -I../sysdeps/unix/sysv/linux  -I../sysdeps/nptl  -I../sysdeps/pthread  -I../sysdeps/gnu  -I../sysdeps/unix/inet  -I../sysdeps/unix/sysv  -I../sysdeps/unix/x86_64  -I../sysdeps/unix  -I../sysdeps/posix  -I../sysdeps/x86_64/64  -I../sysdeps/x86_64/fpu/multiarch  -I../sysdeps/x86_64/fpu  -I../sysdeps/x86/fpu/include -I../sysdeps/x86/fpu  -I../sysdeps/x86_64/multiarch  -I../sysdeps/x86_64  -I../sysdeps/x86  -I../sysdeps/ieee754/float128  -I../sysdeps/ieee754/ldbl-96/include -I../sysdeps/ieee754/ldbl-96  -I../sysdeps/ieee754/dbl-64/wordsize-64  -I../sysdeps/ieee754/dbl-64  -I../sysdeps/ieee754/flt-32  -I../sysdeps/wordsize-64  -I../sysdeps/ieee754  -I../sysdeps/generic  -I.. -I../libio -I.   -D_LIBC_REENTRANT -include /mnt/data/sources/glibc-2.26-build/libc-modules.h -DMODULE_NAME=libc -include ../include/libc-symbols.h  -DPIC     -DTOP_NAMESPACE=glibc -o /mnt/data/sources/glibc-2.26-build/inet/if_index.o -MD -MP -MF /mnt/data/sources/glibc-2.26-build/inet/if_index.o.dt -MT /mnt/data/sources/glibc-2.26-build/inet/if_index.o
../sysdeps/unix/sysv/linux/if_index.c: In function ‘__if_nametoindex’:
../sysdeps/unix/sysv/linux/if_index.c:46:3: error: ‘strncpy’ specified bound 16 equals destination size [-Werror=stringop-truncation]
   strncpy (ifr.ifr_name, ifname, sizeof (ifr.ifr_name));
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [/mnt/data/sources/glibc-2.26-build/sysd-rules:213: /mnt/data/sources/glibc-2.26-build/inet/if_index.o] Fehler 1
make[2]: Verzeichnis „/mnt/data/sources/glibc-2.26/inet“ wird verlassen
make[1]: *** [Makefile:215: inet/subdir_lib] Fehler 2
make[1]: Verzeichnis „/mnt/data/sources/glibc-2.26“ wird verlassen
make: *** [Makefile:9: all] Fehler 2

and 2.25 due to

strftime_l.c: In function ‘__strftime_internal’:
strftime_l.c:719:4: error: macro expands to multiple statements [-Werror=multistatement-macros]
    digits = d > width ? d : width;          \
    ^~~~~~
strftime_l.c:1260:6: note: in expansion of macro ‘DO_NUMBER’
      DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
      ^~~~~~~~~
strftime_l.c:1259:4: note: some parts of macro expansion are not guarded by this ‘else’ clause
    else
    ^~~~
In file included from wcsftime_l.c:23:
strftime_l.c: In function ‘__strftime_internal’:
strftime_l.c:719:4: error: macro expands to multiple statements [-Werror=multistatement-macros]
    digits = d > width ? d : width;          \
    ^~~~~~
strftime_l.c:1260:6: note: in expansion of macro ‘DO_NUMBER’
      DO_NUMBER (1, tp->tm_year + TM_YEAR_BASE);
      ^~~~~~~~~
strftime_l.c:1259:4: note: some parts of macro expansion are not guarded by this ‘else’ clause
    else
    ^~~~
cc1: all warnings being treated as errors
make[2]: *** [../o-iterator.mk:9: /mnt/data/sources/glibc-2.25-build/time/strftime_l.os] Fehler 1

which made me decide to not try out further version.

[The discussion on a report about a similar issue in findutils] suggests to overwrite freadahead.{c,h} from an up-to-date gnulib source root. This causes a chain of problems which is unnecessary to document here as I don't know what I'm doing.

How to get started with fixing, reporting and/or working around this issue?

I'm building m4 from source for a bootstrap script for systems where a user doesn't have privileges to use the package manager. I'm really just interested in building the original GNU m4 from release source tarballs.

An overview of build results on other similarily bare systems is provided at https://gitlab.com/krichter/m4/pipelines/36977411.

[1] In case you're investigating this always install glibc into a custom prefix because an installation in the default prefix /usr/local will most certainly ruine your system. Consider using checkinstall to be sure.

The reason that I need to somehow become root without typing sudo is because

error while loading shared libraries: libc.so.6: 
    cannot open shared object file: No such file or directory

I used sudo to have sudo mv /lib64/libc.so.6 /lib64/libc.so.6.bak

Because I followed some instructions so that I can update the symbolic link to libc-12.4.so instead of the current libc-12.2.so by

LD_PRELOAD=./libc-2.14.so ln -s ./libc-2.14.so ./libc.so.6

But this doesn't work using sudo. Now I am afraid to logout or reboot to the death of the system. Because I need to get root permission to fix this.

I don't have a rescue disk. worse case, I have to mount the hard drive to another machine and fix it.

Please help.

$ sudo bash -c "LD_PRELOAD=./libc-2.14.so ln -s ./libc-2.14.so ./libc.so.6"
sudo: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

$ LD_PRELOAD=./libc-2.14.so sudo LD_PRELOAD=./libc-2.14.so ln -s ./libc-2.14.so ./libc.so.6
sudo: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

$ LD_PRELOAD=./libc-2.12.so sudo LD_PRELOAD=./libc-2.12.so ln -s ./libc-2.12.so ./libc.so.6
sudo: error while loading shared libraries: libc.so.6: cannot open shared object file: No such file or directory

$ LD_PRELOAD=./libc-2.12.so ln -s ./libc-2.12.so ./libc.so.6
ln: creating symbolic link `./libc.so.6': Permission denied

Whenever I try to run a program from the terminal (apt-get for example) I get a:

apt-get: /lib/x86_64-linux-gnu/libc.so.6: version `GLIBC_2.14' not found (required by /usr/lib/libstdc++.so.6)

Not just with apt-get, but with gimp-2.8, vlc, and other programs. I'll always get the message from before, except with a few simple programs like ls.

Not to mention, I can run gimp, or vlc, or install any program through software center or gdebi through any gui system, be it unity's menu, or nautilus's open with. But when it comes to running these programs through a terminal it never works, and I always get that previous error message.

I mess with my system a lot, so I might have broke something. Also I think I went and modified /etc/sudoers file, and I have been hibernating my computer a lot, does that have any effect?

I'm a newbie in dealing with linux, so I have no idea what caused that problem.