Hi,
Jim Leonard wrote on 2009-08-23 20:04:31 -0500 [Re: [BackupPC-users]
BackupPC_dump stalls and leave zombie process]:
> Steve wrote:
> > ---------------------
> > Aug 23 11:23:38 vaccg1 kernel: [ 1890.496217] BackupPC_dump[3888]:
> > segfault at bf23293c ip b7e249ea sp bfe92850 error 4 in
> > libz.so.1.2.3.3[b7e19000+14000]
> > ----------------------
>
> Seems pretty obvious that the problem isn't free memory but rather some
> bug in the interaction between backuppc_dump and libz.
"pretty obvious" as in "completely explains"? So, you are experiencing the
same behaviour? Or, at least, know of someone else that has, ever?
http://www.catb.org/~esr/faqs/smart-questions.html#id306810
> When it dies, there is a core file left behind;
Is there? Well, there might be, and looking at the stack trace might even be a
good idea (though you almost definitely will *not* find out ...
> what part of backuppc_dump you were in to cause it
... because you'll see a C backtrace - probably of stripped code -, not a Perl
backtrace, and Perl code cannot "cause" a SEGV anyway, only a bug in Perl or a
module (part) implemented in C can). Do that if you like, but it is certainly
not mandatory.
I'd either try replacing libz.so.1.2.3.3 with an uncorrupted copy (check the
md5sum of that file if you can; it may not, in fact, be a corrupted libz, but
that's where I'd start looking), if the SEGV happens roughly at the same place
each time, or else think about the possibility of hardware issues (memory, CPU,
I/O, PSU, ...; are you observing any other unexplained problems?). I wouldn't
go so far as to say any of that was obvious, let alone the only possible
explanation.
Hope that helps.
Regards,
Holger
P.S.: I wouldn't discount running out of memory as a possible cause for a
SEGV. It was a good idea to check that.
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