Re: SIGBUS on octeon for my program

I don't speak ktrace but looks like alignment problems with a stack
variable. What does gdb report?

--david

On Wed, Nov 27, 2019 at 8:48 AM Peter J. Philipp <pjp@centroid.eu> wrote:

> Hi,
>
> My DNS program gets a SIGBUS when I execute it. I have ktraced it, upped
> limits and searched in the mips64 source for answers, could this be a
> compiler
> problem?
>
> ktrace----->
> 41651 dddctl CALL connect(6,0xfffffcacb0,16)
> 41651 dddctl STRU struct sockaddr { AF_INET, 192.168.177.2:10053 }
> 41651 dddctl RET connect 0
> 41651 dddctl CALL kbind(0xfffffc9b48,24,0x801d30cbade359aa)
> 41651 dddctl RET kbind 0
> 41651 dddctl PSIG SIGBUS SIG_DFL code BUS_ADRALN<1> addr=0xfffffca17d
> trapno=0
> 82637 dddctl RET wait4 41651/0xa2b3
> <-----------
>
> The SIGBUS code ADRALN I have found in /sys/arch/mips64/mips64/trap.c
> around
> line 463 on OpenBSD 6.6:
>
> ------------>
> case T_ADDR_ERR_LD+T_USER: /* misaligned or kseg access */
> case T_ADDR_ERR_ST+T_USER: /* misaligned or kseg access */
> ucode = 0; /* XXX should be PROT_something */
> signal = SIGBUS;
> sicode = BUS_ADRALN;
> break;
> <-----------
>
> I have also set the stack ulimit to 32K but no relief. I'm stuck,
> wondering
> if you guys can help with interpreting this.
>
> My program can be downloaded with
>
> ftp https://delphinusdns.org/download/snapshot/delphinusdnsd-snapshot.tgz
>
> Where it's remade at midnight CET every day.
>
> As far as I know it should work on macppc although this particular function
> wasn't tested on macppc. And it works on amd64 as I run this delphinusdnsd
> in production on my personal nameservers. Getting this working on octeon
> would broaden my test network.
>
> Best Regards,
> -peter
>
>