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#1 2022-08-04 13:05:00

ckujau
Member
Registered: 2017-02-02
Posts: 11

[SOLVED] GLIBC_ABI_DT_RELR not found

I noticed the following in the my logs, happening since yesterday. After logging to the machine, the systemd unit user@$USERID goes into failed state, yet the login completes and the system can be used just fine:

$ ssh root@host
# systemctl status user@0
× user@0.service - User Manager for UID 0
     Loaded: loaded (/usr/lib/systemd/system/user@.service; static)
     Active: failed (Result: exit-code) since Thu 2022-08-04 14:54:54 CEST; 3s ago
       Docs: man:user@.service(5)
    Process: 2654366 ExecStart=/usr/lib/systemd/systemd --user (code=exited, status=224/PAM)
   Main PID: 2654366 (code=exited, status=224/PAM)
        CPU: 8ms

Aug 04 14:54:54  systemd[1]: Starting User Manager for UID 0...
Aug 04 14:54:54  systemd[2654366]: PAM unable to dlopen(/usr/lib/security/pam_unix.so): /usr/lib/libc.so.6: version `GLIBC_ABI_DT_RELR' not found (required by /usr/lib/libresolv.so.2)
Aug 04 14:54:54  systemd[2654366]: PAM adding faulty module: /usr/lib/security/pam_unix.so
Aug 04 14:54:54  systemd[2654366]: PAM failed: Module is unknown
Aug 04 14:54:54  systemd[2654366]: user@0.service: Failed to set up PAM session: Operation not permitted
Aug 04 14:54:54  systemd[2654366]: user@0.service: Failed at step PAM spawning /usr/lib/systemd/systemd: Operation not permitted
Aug 04 14:54:54  systemd[1]: user@0.service: Main process exited, code=exited, status=224/PAM
Aug 04 14:54:54  systemd[1]: user@0.service: Failed with result 'exit-code'.
Aug 04 14:54:54  systemd[1]: Failed to start User Manager for UID 0.

# objdump -x /usr/lib/libc.so.6  | grep -C2 GLIBC_ABI_DT_RELR
37 0x00 0x069691b6 GLIBC_2.36
	GLIBC_2.35 
38 0x00 0x00fd0e42 GLIBC_ABI_DT_RELR
	GLIBC_2.36 
39 0x00 0x0963cf85 GLIBC_PRIVATE

# objdump -x /usr/lib/libresolv.so.2 | grep -B1 -A6 GLIBC_ABI_DT_RELR
  required from libc.so.6:
    0x00fd0e42 0x00 12 GLIBC_ABI_DT_RELR
    0x06969194 0x00 11 GLIBC_2.14
    0x0d696914 0x00 10 GLIBC_2.4
    0x069691b4 0x00 09 GLIBC_2.34
    0x0963cf85 0x00 08 GLIBC_PRIVATE
    0x09691a75 0x00 07 GLIBC_2.2.5
    0x0d696913 0x00 06 GLIBC_2.3

Package "glibc" has been upgraded from 2.35-6 to 2.36-1 yesterday, so I guess I'll have to wait until the "pam" package has been rebuilt to 2.36?

Last edited by ckujau (2022-08-04 15:02:33)

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#2 2022-08-04 13:28:31

Scimmia
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Registered: 2012-09-01
Posts: 12,098

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

libc.so.6 in 2.36 defines that version. I would guess you're overriding /usr/lib/libc.so.6 somewhere?

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#3 2022-08-04 14:10:48

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

Hm, what do you mean by "override"? 

# ls -l /usr/lib/libc.so.6
-rwxr-xr-x 1 root root 1936696 Jul 31 22:47 /usr/lib/libc.so.6

# pacman -Q -kk glibc
backup file: glibc: /etc/locale.gen (Modification time mismatch)
backup file: glibc: /etc/locale.gen (Size mismatch)
backup file: glibc: /etc/locale.gen (MD5 checksum mismatch)
backup file: glibc: /etc/locale.gen (SHA256 checksum mismatch)
glibc: 1596 total files, 0 altered files

The rest of the package appears to be OK, same for the "pam" package.

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#4 2022-08-04 14:12:38

Scimmia
Fellow
Registered: 2012-09-01
Posts: 12,098

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

I mean you have another libc.so.6 somewhere else higher in your linker path, so that /usr/lib/libc.so.6 isn't being used.

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#5 2022-08-04 14:15:39

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

No, not that I know of. This is a pretty standard (hah!) Arch installation, no other glibc present here.

# locate libc.so.6
/usr/lib/libc.so.6

# find / -xdev -name libc.so.6 -ls
   138883   1896 -rwxr-xr-x   1 root     root      1936696 Jul 31 22:47 /usr/lib/libc.so.6

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#6 2022-08-04 14:16:49

seth
Member
Registered: 2012-09-03
Posts: 58,882

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

readelf -sW /tmp/libc.so.6 | grep GLIBC_ABI_DT_RELR
readelf -sW /tmp/libc.so.6 | grep 2.36
ldd /usr/lib/libresolv.so.2

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#7 2022-08-04 14:18:59

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

# readelf -sW /usr/lib/libc.so.6 | grep -e GLIBC_ABI_DT_RELR -Fe 2.36
    53: 0000000000108ca0    37 FUNC    GLOBAL DEFAULT   15 open_tree@@GLIBC_2.36
   418: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  ABS GLIBC_2.36
   815: 0000000000000000     0 OBJECT  GLOBAL DEFAULT  ABS GLIBC_ABI_DT_RELR
   898: 0000000000039bd0    17 FUNC    WEAK   DEFAULT   15 arc4random_buf@@GLIBC_2.36
  1400: 0000000000039c40   342 FUNC    WEAK   DEFAULT   15 arc4random_uniform@@GLIBC_2.36
  1425: 0000000000108cd0    37 FUNC    GLOBAL DEFAULT   15 pidfd_open@@GLIBC_2.36
  1701: 00000000001089d0    40 FUNC    GLOBAL DEFAULT   15 fsconfig@@GLIBC_2.36
  1852: 0000000000108dc0    37 FUNC    GLOBAL DEFAULT   15 process_mrelease@@GLIBC_2.36
  1903: 00000000000bc460   413 FUNC    GLOBAL DEFAULT   15 c8rtomb@@GLIBC_2.36
  2046: 0000000000108d60    40 FUNC    GLOBAL DEFAULT   15 pidfd_send_signal@@GLIBC_2.36
  2211: 00000000000bc250   516 FUNC    GLOBAL DEFAULT   15 mbrtoc8@@GLIBC_2.36
  2270: 0000000000108d90    40 FUNC    GLOBAL DEFAULT   15 process_madvise@@GLIBC_2.36
  2288: 0000000000108a60    37 FUNC    GLOBAL DEFAULT   15 fspick@@GLIBC_2.36
  2314: 0000000000108a30    37 FUNC    GLOBAL DEFAULT   15 fsopen@@GLIBC_2.36
  2404: 0000000000108c10    40 FUNC    GLOBAL DEFAULT   15 mount_setattr@@GLIBC_2.36
  2546: 0000000000108c40    40 FUNC    GLOBAL DEFAULT   15 move_mount@@GLIBC_2.36
  2814: 0000000000108a00    37 FUNC    GLOBAL DEFAULT   15 fsmount@@GLIBC_2.36
  2952: 0000000000039bf0    70 FUNC    WEAK   DEFAULT   15 arc4random@@GLIBC_2.36
  2955: 0000000000108d00    37 FUNC    GLOBAL DEFAULT   15 pidfd_getfd@@GLIBC_2.36

# ldd /usr/lib/libresolv.so.2
        linux-vdso.so.1 => linux-vdso.so.1 (0x00006c56dbeb4000)
        libc.so.6 => /usr/lib/libc.so.6 (0x00006c56dbca9000)
        /usr/lib64/ld-linux-x86-64.so.2 => /usr/lib64/ld-linux-x86-64.so.2 (0x00006c56dbeb6000)

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#8 2022-08-04 14:33:47

seth
Member
Registered: 2012-09-03
Posts: 58,882

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

I separated the greps so I wouldn't have to look for it in your reply, but oh, well.

So the symbol is there and you're also on the 2.36 library - did you reboot after the update (speculating for some filesystem cache here)?

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#9 2022-08-04 14:46:40

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

No, I have not rebooted yet, just checked with "lsof" for stale file handles, but nothing related to glibc turned up.

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#10 2022-08-04 15:01:03

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

Sadl^W Interestingly, a reboot did the trick, and the errors are gone now :-\ Maybe someone replaced my system with a Windows VM, hm? :-)

@all: Thanks for your help here, much appreciated.

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#11 2022-08-04 15:22:46

seth
Member
Registered: 2012-09-03
Posts: 58,882

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

btrfs?

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#12 2022-08-04 16:18:32

ckujau
Member
Registered: 2017-02-02
Posts: 11

Re: [SOLVED] GLIBC_ABI_DT_RELR not found

No, ext4. The only "exotic" thing about this machine would be the linux-hardened kernel from Arch, apart from that it's pretty boring, I think.

$ mount | grep ext
/dev/xvda2 on / type ext4 (rw,relatime)
/dev/xvda1 on /boot type ext4 (rw,nosuid,nodev,relatime,stripe=4)

(Huh, that stripe option is weird though, but not related to that topic here.)

Last edited by ckujau (2022-08-04 16:19:45)

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