On Friday 29 December 2006 00:36, Mike wrote:
> I'm not pointing fingers, I'm trying to figure out why one of my
> machines will just freeze. The box is a FC5 that is up to date with
> all patches. Currently it is running bacula 1.38.11 and other stuff.
> Since Saturday evening the box has frozen maybe eight times so
> hard that I cannot login. The only way to get into the box is to
> power the box off and hope everything comes back.
> 
> Today I turned off bacula (service bacula stop) and the box has
> not frozen. Is there possibly a situation where something in
> bacula is getting such a huge list of files that it starts swapping
> or something similiar? When the box freezes there are no full filesystems
> and the brief glimpse of 'top' didn't show any processes that I
> found interesting.

If your system is totally freezing, then it is *very* unlikely that it has 
anything to do with what Bacula is doing in userland.  Much more likely is 
a "kernel" bug, which normally breaks down to a SCSI driver bug.  I have 
never seen a case where a Bacula bug could totally freeze a system (it may 
run at 1/100 normal speed, but the OS continues running).

Recently, I (as well as others) ran into a problem similar to yours on SuSE 
10.1 (I forget which kernel version) and it was indeed a bug in the SCSI 
driver.  I solved the problem by loading an FC4 kernel, then a bit later a 
SuSE 10.2 kernel, and then even later a patch from SuSE.  

You might want to try something similar (i.e. either load a FC4 kernel or an 
FC6 kernel, or an FC5 kernel that you are 100% sure that works).  

The problem with these kinds of bugs is that once they get into a kernel they 
continue to appear in subsequent releases for quite some time.  If you are 
desperate, you can check the Bacula mail archives as I think I published the 
fix on the list.  Also, please be aware that this bug totally destroyed the 
filesystem on one machine when I was testing it, so I suggest that you 
attempt to minimize the number of crashes to the absolute minimum.

Regards, 

Kern

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