Re: unaligned access

[Welterlen Benoit <benoit.welterlen@ext.bull.net>]

Guy De Leeuw wrote:
> Hello,
>
> Just for information, I have regulary a lot of messages unaligned access :
>
> When starting the server (dmesg extraction) :
> Fusion MPT base driver 3.03.09
> Copyright (c) 1999-2005 LSI Logic Corporation
> Fusion MPT SPI Host driver 3.03.09
> kernel unaligned access to 0xe00000007e4d80cc, ip=0xa00000010034a661
> kernel unaligned access to 0xe00000007e4d80d4, ip=0xa0000002004c7071
> kernel unaligned access to 0xe00000007e4d80dc, ip=0xa0000002004c7081
> kernel unaligned access to 0xe00000007e4d84cc, ip=0xa00000010034a661
> kernel unaligned access to 0xe00000007e4d84d4, ip=0xa0000002004c7071
>
> dmidecode :
> installer/syslog:Aug 31 05:03:11 kernel: dmidecode(32750): unaligned access to 
> 0x600000000000c127, ip=0x4000000000003ac0
> installer/syslog:Aug 31 05:03:11 kernel: dmidecode(32750): unaligned access to 
> 0x600000000000c2ef, ip=0x4000000000001fa1
> installer/syslog:Aug 31 05:03:11 kernel: dmidecode(32750): unaligned access to 
> 0x600000000000c2f7, ip=0x4000000000006071
> installer/syslog:Aug 31 05:03:11 kernel: dmidecode(32750): unaligned access to 
> 0x600000000000c447, ip=0x4000000000001fa1
> installer/syslog:Aug 31 05:03:11 kernel: dmidecode(32750): unaligned access to 
> 0x600000000000c44f, ip=0x40000000000060d1
>
> and also spamd and gs
> the problem is spamd because a lot of messages apear on the console
>
> Guy
>
>
>   
Hello


If you want to debug and fixe the application, you can follow these steps :
- compile the application in debug mode

- activate cores :

  $ ulimit -c unlimited

- run the application with prctl :

  $ prctl --unaligned=signal <cmd>
  [...]
  Bus error (core dumped)

- analyse the core dump with gdb

If  you only want to disable unaligned message, you can run the 
application with
"prctl --unaligned=silent "

Benoit