>>>>> On Fri, 18 Mar 2011 20:47:03 +0100, Christian Manal said:
>
> Am 18.03.2011 19:26, schrieb Martin Simmons:
> >>>>>> On Fri, 18 Mar 2011 13:36:36 +0100, Christian Manal said:
> >>
> >> Am 18.03.2011 13:03, schrieb Martin Simmons:
> >>>>>>>> On Fri, 18 Mar 2011 11:37:33 +0100, Christian Manal said:
> >>>>
> >>>> Am 18.03.2011 10:40, schrieb Christian Manal:
>>>>> Am 16.03.2011 09:14, schrieb Christian Manal:
> >>>>>> Am 15.03.2011 19:12, schrieb Christian Manal:
> >>>>>> Am 15.03.2011 17:49, schrieb Kjetil Torgrim Homme:
> >>>>>>>> Christian Manal <moenoel AT informatik.uni-bremen DOT de> writes:
> >>>>>>>>
> >>>>>>>> Also, after several accurate jobs running without restarting Bacula,
> >>>>>>>> the total memory usage of the director and fd didn't go up anymore,
> >>>>>>>> so
> >>>>>>>> I presume it comes down to the behavior of Solaris' free(), as
> >>>>>>>> described in the above quoted manpage.
> >>>>>>>>
> >>>>>>>> libumem may work better -- just set LD_PRELOAD, you don't have to
> >>>>>>>> recompile. I'd appreciate it if you report back if you try it.
> >>>>>>>>
> >>>>>>>
> >>>>>> Actually, I already did that. Modified the startup script for the
> >>>>>> affected fd (don't want the director crashing if things go wrong) and
> >>>>>> restarted. I will report the results tomorrow.
> >>>>>>
> >>>>>> Looks good.
> >>>>>
>>>>> Maybe I spoke too soon. Last night my director crashed with a segfault,
>>>>> after switching to libumem. Leading to that was an unusually long
>>>>> running job (the accurate one) which, going by the size, looked like it
>>>>> was doing a full instead of incremental for some reason.
> >>>>>
>>>>> I have some output from mdb and pstack attached.
> >>>>
> >>>> And going by dbx, the dir went kaboom in Jmsg().
> >>>> ...
> >>>> =>[1] Jmsg(0xbefe5be0, 0x1, 0x0, 0x0, 0xfee8e25e, 0xf6caddb0), at
> >>>> 0xfee6a580
> >>>> [2] j_msg(0x80c360e, 0x154, 0xbefe5be0, 0x1, 0x0, 0x0), at 0xfee6a7ad
> >>>> [3] start_storage_daemon_message_thread(0xbefe5be0, 0x80bc7f5,
> >>>> 0xfdc7f960, 0x0, 0x80bc798, 0xfde8fe6c), at 0x80834bc
> >>>> [4] do_backup(0xbefe5be0, 0x4, 0x0, 0xfdf91200, 0xfeea26e4,
> >>>> 0xfdf91200), at 0x80658b0
> >>>> [5] _ZL10job_threadPv(0xbefe5be0, 0x1, 0xfe7c0dc7, 0xfe8422cc,
> >>>> 0xfe8422c0, 0xfdf91200), at 0x807a96e
> >>>> [6] jobq_server(0x80e5080), at 0x807d127
> >>>> [7] _thr_setup(0xfdf91200), at 0xfe7c7e66
> >>>> [8] _lwp_start(0xfee8e708, 0x0, 0x0, 0xfde8ea00, 0x7, 0x0), at
> >>>> 0xfe7c8150
> >>>
> >>> It looks like it ran out of memory (the segfault is deliberate, due to
> >>> failure
> >>> to create a thread in start_storage_daemon_message_thread).
> >>
> >> That's strange. I'm monitoring that box with Nagios + pnp4nagios.
> >> Neither did Nagios report unusually high memory usage nor do I see a
> >> spike on the pnp4nagios graphs for memory and swap.
> >>
> >>
> >>> Did it write any info to the Bacula log? It should say "Cannot create
> >>> message
> >>> thread:" followed by the error message.
> >>
> >> The logfile just cleanly ends after the last finished job. But it seems
> >> to be in the coredump:
> >>
> >> core:msgchan.c:340 Cannot create message thread: Resource temporarily
> >> unavailable
> >
> > "Resource temporarily unavailable" occurs when Solaris can't allocate the
> > stack for a new thread, so memory pressure is a likely reason. It may be
> > invisible to Nagios if the memory is just reserved rather than being in use
> > (something that malloc implementations will do differently).
> >
>
> Hm.. but this didn't happen until I switched the director to libumem and
> the servers runs several other services which didn't blow up with no
> memory. So it looks like it has something to do with dir+umem, doesn't it?
Yes, but changing the memory allocator can have far-reaching consequences.
How large was the core dump?
> I think I may set up a test environment, when I have time, to take a
> closer look at this issue.
You could try running pmap to see how the memory layout changes while it is
doing the backup.
Also, building Bacula as a 64-bit program might solve it (if you can get all
of the dependent libraries in 64-bit format).
__Martin
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