`rsync_bpc` failures and corrupted backups?
Jérôme Augé <[email protected]> Fri, 17 Jul 2026 10:10:37 +0200
| Newsgroups | gmane.comp.sysutils.backup.backuppc.general |
|---|---|
| Message-ID | <CABGu5_5bXegwRiViMXpG+3No=0u9aMHBhq8jEp9WCpZXf9xNfA@mail.gmail.com> |
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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/fplatfo=
rm/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_bi=
nary-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_cn=
f_Commands-amd64
new recv >f+++++++++ rw-r--r-- 0, 0 14268271
var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_main_i1=
8n_Translation-en
b/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_bi=
nary-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_multive=
rse_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_multive=
rse_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_multive=
rse_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,
J=C3=A9r=C3=B4me
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<div dir=3D"ltr"><div><div class=3D"gmail_default" style=3D"font-family:ari=
al,helvetica,sans-serif">Hi,<br><br>I'm currently configuring a new bar=
e-metal BackupPC v4 server with Ubuntu 24.04 packages (backuppc `4.4.0-8bui=
ld1` + 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 cor=
ruptions.<br><br>Hosts appears to be backed up correctly in the UI, but whe=
n I look at the XferLOG or browse the list of files from the UI, I see erro=
rs and missing files/dirs.<br><br>I have observed two cases of corruptions =
so far.<br><br>One occurred during a network outage (at the beginning of th=
e month) that left some files unreadable as seen with `BackupPC_tarCreate` =
with errors like `U<span style=3D"background-color:transparent">nable to op=
en file /var/lib/backuppc/cpool/88/02/88036288273a3822100d464b08bdaf24 (for=
./var/cache/swcatalog/cache/C-os-catalog.xb)` and `</span><span style=3D"b=
ackground-color:transparent">Error: padding /var/lib/backuppc/cpool/00/60/0=
1601c8b38ebc83c78e3fccb914b69fc to 1067 bytes from =C2=A0bytes (for ./var/l=
ib/dpkg/info/linux-modules-6.8.0-51-generic.postrm)`.<br></span></div></div=
><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-ser=
if"><span style=3D"background-color:transparent"><br></span></div><div clas=
s=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"><span =
style=3D"background-color:transparent">The second one occurred this evening=
, without any network outage, with a host showing many errors in the XferLO=
G like:</span></div><div class=3D"gmail_default" style=3D"font-family:arial=
,helvetica,sans-serif"><span style=3D"background-color:transparent">- `</sp=
an>G bpc_path_create: can't create f%2f/fetc (errno 2)`<br></div><div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">- `=
<span style=3D"font-family:Arial,Helvetica,sans-serif;background-color:tran=
sparent">rsync_bpc: recv_generator: mkdir "/etc/NetworkManager" f=
ailed: No such file or directory (2)`</span></div><div class=3D"gmail_defau=
lt" style=3D"font-family:arial,helvetica,sans-serif"><span style=3D"font-fa=
mily:Arial,Helvetica,sans-serif;background-color:transparent">- `</span>G b=
pc_poolWrite_updateMatches: can't open candidate file /var/lib/backuppc=
/cpool/7c/1a/7d1acb7c259e7575f6d5f609c092cb8101 for read<span style=3D"font=
-family:Arial,Helvetica,sans-serif;background-color:transparent">`</span></=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif"><span style=3D"background-color:transparent">- `</span>G bpc_attribC=
ache_dirWrite: failed to write attributes for dir f%2f/fusr/flib/fmodules/f=
5.15.0-156-generic/fkernel/fdrivers/fmedia/fplatform/fcadence/attrib<span s=
tyle=3D"background-color:transparent">`</span></div><div class=3D"gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">`/var/l=
og/kern.log` shows a segfault at 06:00:</div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=3D"gma=
il_default" style=3D"font-family:arial,helvetica,sans-serif">--8<--</div=
><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-ser=
if">2026-07-17T06:00:02.713828+02:00 srv kernel: rsync_bpc[924655]: segfaul=
t at 7fffa63cc000 ip 0000788f30231c0e sp 00007fffa63c71f0 error 4 in libc.s=
o.6[788f30228000+188000] likely on CPU 11 (core 6, socket 0)<br>2026-07-17T=
06:00:02.713968+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<br></div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif">-->8--</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif">What I also find =
strange, is that the XferLOG seems to be garbled with what looks like multi=
ples processes overwriting each other and truncated lines, e.g.:<br></div><=
div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif=
"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif">--8<--</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif">[...]</div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif">=C2=A0 =C2=A0 new =C2=A0 =C2=
=A0recv >f+++++++++ rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=A0 =C2=
=A0 =C2=A0 0 =C2=A019067713 var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_=
dists_jammy-security_main_binary-amd64_Packages<br>=C2=A0 =C2=A0 same =C2=
=A0 recv >f..tp..... rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=A0 =C2=
=A0 =C2=A0 0 =C2=A0 =C2=A0 58932 var/lib/apt/lists/fr.archive.ubuntu.com_ub=
untu_dists_jammy-security_main_cnf_Commands-amd64<br>=C2=A0 =C2=A0 new =C2=
=A0 =C2=A0recv >f+++++++++ rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=
=A0 =C2=A0 =C2=A0 0 =C2=A014268271 var/lib/apt/lists/fr.archive.ubuntu.com_=
ubuntu_dists_jammy-security_main_i18n_Translation-en<br>b/apt/lists/fr.arch=
ive.ubuntu.com_ubuntu_dists_jammy-security_multiverse_binary-amd64_Packages=
<br>nchpadcontent.net_ondrej_php_ubuntu_dists_jammy_InRelease<br>zabbix_5.0=
_ubuntu_dists_jammy_InRelease<br>m/config_mounts<br>source-none/sem/config_=
write_files_deferred<br>=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0recv >f=
..tp..... rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=A0 =C2=A0 =C2=A0 0 =
=C2=A0 =C2=A0449496 var/lib/apt/lists/fr.archive.ubuntu.com_ubuntu_dists_ja=
mmy-security_multiverse_binary-amd64_Packages<br>=C2=A0 =C2=A0 same =C2=A0 =
recv >f..tp..... rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=A0 =C2=A0 =
=C2=A0 0 =C2=A0 =C2=A0 =C2=A02063 var/lib/apt/lists/fr.archive.ubuntu.com_u=
buntu_dists_jammy-security_multiverse_cnf_Commands-amd64<br>=C2=A0 =C2=A0 s=
ame =C2=A0 recv >f..tp..... rw-r--r-- =C2=A0 =C2=A0 =C2=A0 =C2=A00, =C2=
=A0 =C2=A0 =C2=A0 0 =C2=A0 =C2=A0140111 var/lib/apt/lists/fr.archive.ubuntu=
.com_ubuntu_dists_jammy-security_multiverse_i18n_Translation-en<br></div><d=
iv class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"=
>[...]</div><div class=3D"gmail_default" style=3D"font-family:arial,helveti=
ca,sans-serif">-->8--</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif">Anyone observing similar corr=
uptions with BackupPC v4 on Ubuntu 24.04?</div><div class=3D"gmail_default"=
style=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=3D"g=
mail_default" style=3D"font-family:arial,helvetica,sans-serif"><span style=
=3D"background-color:transparent">I'm pondering switching to "tar&=
quot; XferMethod to see if it helps...</span></div><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">Regards=
,</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif">J=C3=A9r=C3=B4me</div><div dir=3D"ltr" class=3D"gmail_signature" =
data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><div dir=3D"ltr"><=
div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div =
dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"ltr"><div><div dir=3D"lt=
r"><div style=3D"color:rgb(136,136,136);font-family:arial,helvetica,sans-se=
rif;font-size:13px;white-space:normal">
</div>
</div></div></div></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div></div></div>
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