Re: Strange deadlock

[BERTRAND Joël <joel.bertrand%systella.fr@localhost>]

BERTRAND Joël a écrit :
> Michael a écrit :
> > Hello,
> >
> > On Mon, 21 Jul 2014 21:30:47 +0200
> > BERTRAND Joël <joel.bertrand%systella.fr@localhost> wrote:
> >
> > >     Hello,
> > >
> > >     Some weeks ago, I have indicated here I have a stability issue
> > > with my
> > > Blade2000 running NetBSD :
> > >
> > > trap type 0x68: cpu 1, pc=410657c0 npc=410657ac
> > > pstate=0xffffffff99820092<,PEF,IE>
> > > Skipping crash dump on recursive panic
> > > panic: +fast data access MMU miss
> > > cpu1: Begin traceback...
> > > cpu1: End traceback...
> > > cpu0: shutting down
> > > cpu1: rebooting
> > >
> > >     That was with 6.99.40 kernel. I have changed a faulty memory module,
> > > rebuilt all packages I use from sources (perl, gtk and all dependencies)
> > > and rebuilt a new kernel :
> > >
> > > NetBSD legendre.systella.fr 6.99.47 NetBSD 6.99.47 (CUSTOM) #1: Sun Jul
> > > 20 15:21:37 CEST 2014
> > > root%legendre.systella.fr@localhost:/usr/src/sys/arch/sparc64/compile/CUSTOM
> > > sparc64
> > >
> > >     CUSTOM stands for GENERIC.MP with some minor modifications :
> > >
> > > sd0     at scsibus4 target 0 lun 0
> > > sd1     at scsibus4 target 1 lun 0
> > > cd0     at scsibus0 target 6 lun 0
> > > ...
> > > # Wedge support
> > > options         DKWEDGE_AUTODISCOVER
> > > options         DKWEDGE_METHOD_GPT
> > >
> > >     With 6.99.40 kernel, this workstation was stable enough to build
> > > packages from sources (load average : 6). With 6.99.47, it has hanged
> > > just after a few hours.
> > >
> > >     At 12:48 (CEST), this workstation has crashed under heavy I/O (gcc48
> > > compilation). Something very similar to a deadlock and I have rebooted
> > > it with power button. Console didn't respond, network subsystem didn't
> > > answer to ping... There was no information on console or serial line. No
> > > panic and no dump file.
> > >
> > >     I don't think if it is sparc specific, I don't have any other
> > > information. Has anyone ever seen the same problem?
> >
> > I've seen my sb2500 spontaneously reboot under heavy load with .47,
> > it's been rock stable with .44 ( and many, many older revisions )
>
>      In my case, it's not a reboot, only a complete deadlock and I
> haven't found any sparc64 specific modification between .40 that panics
> and reboots and .47 that locks...
>
>      Regards,
>
>      JKB

	I think I have found why my blade2000 was not stable. One of CPU was 
dying. With a new one, system is seems to be stable with a load average 
greater than 6 during several days (kernel 6.99.49).

        I only have to buy new CPU's :-(

        Regards,

        JKB