Hi,
I'm currently configuring a new bare-metal BackupPC v4 server with Ubuntu
24.04 packages (backuppc `4.4.0-8build1` + backuppc-rsync
`3.1.3.0-3ubuntu1`), for replacing our aging BackupPC v3 on Ubuntu 20.04,
and I'm experiencing various errors and silent corruptions.
Hosts appears to be backed up correctly in the UI, but when I look at the
XferLOG or browse the list of files from the UI, I see errors and missing
files/dirs.
I have observed two cases of corruptions so far.
One occurred during a network outage (at the beginning of the month) that
left some files unreadable as seen with `BackupPC_tarCreate` with errors
like `Unable to open file
/var/lib/backuppc/cpool/88/02/88036288273a3822100d464b08bdaf24 (for
./var/cache/swcatalog/cache/C-os-catalog.xb)` and `Error: padding
/var/lib/backuppc/cpool/00/60/01601c8b38ebc83c78e3fccb914b69fc to 1067
bytes from bytes (for
./var/lib/dpkg/info/linux-modules-6.8.0-51-generic.postrm)`.
The second one occurred this evening, without any network outage, with a
host showing many errors in the XferLOG like:
- `G bpc_path_create: can't create f%2f/fetc (errno 2)`
- `rsync_bpc: recv_generator: mkdir "/etc/NetworkManager" failed: No such
file or directory (2)`
- `G bpc_poolWrite_updateMatches: can't open candidate file
/var/lib/backuppc/cpool/7c/1a/7d1acb7c259e7575f6d5f609c092cb8101 for read`
- `G bpc_attribCache_dirWrite: failed to write attributes for dir
f%2f/fusr/flib/fmodules/f5.15.0-156-generic/fkernel/fdrivers/fmedia/fplatform/fcadence/attrib
`
`/var/log/kern.log` shows a segfault at 06:00:
--8<--
2026-07-17T06:00:02.713828+02:00 srv kernel: rsync_bpc[924655]: segfault at
7fffa63cc000 ip 0000788f30231c0e sp 00007fffa63c71f0 error 4 in
libc.so.6[788f30228000+188000] likely on CPU 11 (core 6, socket 0)
2026-07-17T06:00:02.713968+02:00 srv kernel: Code: c7 45 a8 04 00 00 00 eb
21 0f 1f 00 89 13 48 89 f8 48 89 f3 4c 39 e0 0f 84 36 01 00 00 48 8d 73 04
49 39 f6 0f 82 22 01 00 00 <0f> b6 10 48 8d 78 01 89 d1 84 d2 79 d5 81 ea
c2 00 00 00 83 fa 1d
-->8--
What I also find strange, is that the XferLOG seems to be garbled with what
looks like multiples processes overwriting each other and truncated lines,
e.g.:
--8<--
[...]
new recv >f+++++++++ rw-r--r-- 0, 0 19067713
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_main_binary-amd64_Packages
same recv >f..tp..... rw-r--r-- 0, 0 58932
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_main_cnf_Commands-amd64
new recv >f+++++++++ rw-r--r-- 0, 0 14268271
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_main_i18n_Translation-en
b/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_binary-amd64_Packages
nchpadcontent.net_ondrej_php_ubuntu_dists_jammy_InRelease
zabbix_5.0_ubuntu_dists_jammy_InRelease
m/config_mounts
source-none/sem/config_write_files_deferred
recv >f..tp..... rw-r--r-- 0, 0 449496
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_binary-amd64_Packages
same recv >f..tp..... rw-r--r-- 0, 0 2063
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_cnf_Commands-amd64
same recv >f..tp..... rw-r--r-- 0, 0 140111
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_i18n_Translation-en
[...]
-->8--
Anyone observing similar corruptions with BackupPC v4 on Ubuntu 24.04?
I'm pondering switching to "tar" XferMethod to see if it helps...
Regards,
Jérôme
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