Re: Strange deadlock

[Michael <macallan%netbsd.org@localhost>]

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 )

have fun
Michael