Summary and Info:

Since today, i'm running pacman -Syu on one server and i get a "segmentation fault".
Not unable to solve this issues in any way ... :
- there is at this time no space issues (/tmp has space, /var/log also, same for /var/cache/ ...)
- replacing mirrors by other mirrors in etc/pacman.d/mirrorlist does not help
- removing the /var/lib/pacman/sync db files does not help

Stack :

pacman --debug -Syu
debug: pacman v5.2.2 - libalpm v12.0.2
debug: config: attempting to read file /etc/pacman.conf
debug: config: new section 'options'
debug: config: HoldPkg: pacman
debug: config: HoldPkg: glibc
debug: config: arch: x86_64
debug: config: SigLevel: Required
debug: config: SigLevel: DatabaseOptional
debug: config: LocalFileSigLevel: Optional
debug: config: new section 'core'
debug: config file /etc/pacman.conf, line 76: including /etc/pacman.d/mirrorlist
debug: config: new section 'extra'
debug: config file /etc/pacman.conf, line 79: including /etc/pacman.d/mirrorlist
debug: config: new section 'community'
debug: config file /etc/pacman.conf, line 85: including /etc/pacman.d/mirrorlist
debug: config: finished parsing /etc/pacman.conf
debug: setup_libalpm called
debug: option 'logfile' = /var/log/pacman.log
debug: option 'gpgdir' = /etc/pacman.d/gnupg/
debug: option 'hookdir' = /etc/pacman.d/hooks/
debug: option 'cachedir' = /var/cache/pacman/pkg/
debug: registering sync database 'core'
debug: database path for tree core set to /var/lib/pacman/sync/core.db
debug: "/var/lib/pacman/sync/core.db" is not readable: Aucun fichier ou dossier de ce type
debug: setting usage of 15 for core repository
debug: adding new server URL to database 'core': https://mirror.cyberbits.eu/archlinux/core/os/x86_64
debug: registering sync database 'extra'
debug: database path for tree extra set to /var/lib/pacman/sync/extra.db
debug: "/var/lib/pacman/sync/extra.db" is not readable: Aucun fichier ou dossier de ce type
debug: setting usage of 15 for extra repository
debug: adding new server URL to database 'extra': https://mirror.cyberbits.eu/archlinux/extra/os/x86_64
debug: registering sync database 'community'
debug: database path for tree community set to /var/lib/pacman/sync/community.db
debug: "/var/lib/pacman/sync/community.db" is not readable: Aucun fichier ou dossier de ce type
debug: setting usage of 15 for community repository
debug: adding new server URL to database 'community': https://mirror.cyberbits.eu/archlinux/community/os/x86_64
:: Synchronisation des bases de données de paquets…
debug: url: https://mirror.cyberbits.eu/archlinux/core/os/x86_64/core.db
debug: maxsize: 134217728
debug: opened tempfile for download: /var/lib/pacman/sync/core.db.part (wb)

error: segmentation fault
Please submit a full bug report with --debug if appropriate.

Content of /var/lib/pacman/sync :
-rw-r--r-- 1 root root 5,2M 2020-08-22 09:50 community.db
-rw-r--r-- 1 root root 132K 2020-08-21 21:13 core.db
-rw-r--r-- 1 root root 0 2020-08-22 10:48 core.db.part
-rw-r--r-- 1 root root 1,7M 2020-08-22 09:36 extra.db

I can write files in that folder without any issues.

root:sync/ # ll [10:57:24]
total 6,9M
-rw-r--r-- 1 root root 5,2M 2020-08-22 09:50 community.db
-rw-r--r-- 1 root root 132K 2020-08-21 21:13 core.db
-rw-r--r-- 1 root root 0 2020-08-22 10:48 core.db.part
-rw-r--r-- 1 root root 1,7M 2020-08-22 09:36 extra.db
-rw-r--r-- 1 root root 11 2020-08-22 10:57 test
root:sync/ # cat test [10:57:25]
write test



Steps to Reproduce:

Just run pacman -Syu

Seems NOT directly the same than FS#53904.