[Samba] samba PANIC

[Volker Lendecke]

On Wed, Nov 30, 2011 at 11:11:46PM +0100, skull wrote:
> Am 30.11.2011 14:50, schrieb Michael Wood:
> >On 30 November 2011 14:21, Volker Lendecke<Volker.Lendecke at sernet.de>  
> >wrote:
> >>On Wed, Nov 30, 2011 at 01:49:28PM +0200, Michael Wood wrote:
> >>>On 30 November 2011 11:38, Volker Lendecke<Volker.Lendecke at sernet.de>  
> >>>wrote:
> >[...]
> >>>>Nov 30 07:00:24 dc smbd[16828]: tdb(/var/lib/samba/locking.tdb): 
> >>>>tdb_rec_read bad magic 0x42424242 at offset=3494648
> >>>>
> >>>>In the past these problems have often been caused by bad
> >>>>hardware.
> >>>If it's bad hardware, where does the "BBBB" come from?  Seems sort of
> >>>unlikely (although, of course, not impossible.)
> >>>
> >>>Does tdb ever set things to 0x42424242 somewhere in order to mark it
> >>>as "freed" or something?  I don't see anything like that from a
> >>>cursory glance at the code, though.
> >>Newly allocated file space will be filled with that pattern.
> >>If you have different proof that we have a software bug and
> >>a patch, I would be more than happy to review it.
> >I'm sure you would :)
> >
> >This is not a problem that is happening to me (I am not skull), and I
> >of course do not have any proof that this is a software bug, let alone
> >a patch.  I just found it strange that a hardware problem would cause
> >"BBBB" to be found where some sort of TDB magic value was expected.
> >You, of course, have infinitely more experience with this sort of
> >thing than I have.  I just thought I'd ask.
> >
> >>With best regards,
> >Same here.
> >
> i have no idea what you guys are talking about ;)
> but i will replace the server ram on friday. i will report if it fixed 
> the problem or not.
> if not: i will start posting error logs again anyway.

Till then: "use mmap = no" might provide a workaround.

Volker

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