Re: [Bacula-users] Bacula 5.0.3 on EL6

Did you build RPMs from the source RPM? EL6 uses a newer version of glibc that has stack and buffer overflow protection mechanisms. I don't know what the status of 5.0.3 is with regards to these glibc mechanisms, but previous versions would fail in like manner when, in particular, the -DFORTIFY_SOURCE flag was set to anything other than zero. Fedora, since version 8, has set -DFORTIFY_SOURCE=2. I have not used EL6, but my guess is that EL6 is doing the same thing as newer versions of Fedora.

In any case, Bacula should be compiled using the compiler flags that are set when Bacula is built from source, rather than from rpmbuild. Either build from the source tarball or else set the proper CFLAGS in the global cflags used by rpmbuild, which is set by the %__global_cflags macro in /usr/lib/rpm/redhat/macros, if you want/need an RPM. You can see what CFLAGS should be by running configure against the source tarball. (FORTIFY_SOURCE will not be defined at all, or will be set to zero.) Then set %__global_cflags accordingly and use rpmbuild to build the RPMs with the proper flags. Note that you will have to restore the %__global_cflags macro to its original state before building any of Redhat's source RPMs, which are designed to have FORTIFY_SOURCE=2.

Again, I'm not certain this is still an issue with building Bacula RPMs on Fedora (or probably EL6), but it is a possible (probable?) cause of this error. If so, then keep in mind that this is not a real buffer overrun, and does NOT mean that Bacula has any buffer overrun vulnerabilities. It is caused by inadvertently turning on a glibc "feature" that Bacula does not have any use for.

On 2/25/2011 4:45 AM, Michael Devogelaere wrote:

Hi,

Is anybody having troubles with running Bacula 5.0.3 filedaemon on (Oracle) Enterprise Linux 6 - 64 bits ?
Yesterday i upgrade one of our servers. I recompiled the filedaemon and now the filedaemon fails almost immediately after starting a backupjob.
I tried with various options: without openssl, static binaries but none of them worked.
I'm getting this error (please note that "backup" is not our bacula director server: that one is still running fine on EL5)

[root@backup ~]# 25-Feb 10:22 backup-fd: ABORTING due to ERROR in smartall.c:215
Buffer overrun called from crypto.c:688
Bacula interrupted by signal 11: Segmentation violation
Kaboom! bacula-fd, backup-fd got signal 11 - Segmentation violation. Attempting traceback.
Kaboom! exepath=/usr/sbin/
Calling: /usr/sbin/btraceback /usr/sbin/bacula-fd 7229 /var/lib/bacula
/usr/sbin/btraceback: line 45: /usr/sbin/bsmtp: No such file or directory
cat: write error: Broken pipe
It looks like the traceback worked ...
Dumping: /var/lib/bacula/backup-fd.7229.bactrace
^C

The traceback:
[root@backup ~]# cat /var/lib/bacula/backup-fd.7229.bactrace
Attempt to dump locks
threadid=0x7f307ffff700 max=0 current=-1
threadid=0x7f3084eeb700 max=1 current=-1
threadid=0x7f30856ec700 max=1 current=-1
threadid=0x7f308f1c37e0 max=0 current=-1
Attempt to dump current JCRs. njcrs=1
threadid=(nil) JobId=21589 JobStatus=R jcr=0x7f3078001078 name=backup.nodomino.2011-02-25_10.22.37_46
threadid=(nil) killable=0 JobId=21589 JobStatus=R jcr=0x7f3078001078 name=backup.nodomino.2011-02-25_10.22.37_46
use_count=1
JobType=B JobLevel=I
sched_time=25-Feb-2011 10:22 start_time=25-Feb-2011 10:22
end_time=01-Jan-1970 01:00 wait_time=01-Jan-1970 01:00
db=(nil) db_batch=(nil) batch_started=0
Attempt to dump plugins. Hook count=0

My bacula-fd configuration file:
Director {
Name = BAC-dir
Password = "XXXXXXXXXXXXXXXXXXXXXXX"
}

FileDaemon {
Name = backup-fd
FDport = 9102
WorkingDirectory = /var/lib/bacula
Pid Directory = /var/run
Maximum Concurrent Jobs = 2
}

Messages {
Name = Standard
director = BAC-dir = all, !skipped, !restored
}

Kind regards,
Michaël Devogelaere
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