Re: [9fans] 9pcfs mballoc bug info

[Francisco J Ballesteros <nemo@gsyc.escet.urjc.es>]

jmk@plan9.bell-labs.com wrote:
>
> are we looking at the same driver? in the one i have there is
> one call to mbfree in the 905 section:
>
>                 if(pd->mb != nil){
>                         mbfree(pd->mb);
>                         pd->mb = nil;
>                 }

Yes, and that call to mbfree() was the one made twice.
My first silly try was to put the mbfree inside an if,
to do it only if the mb was not already FREE.
The second caller of mbfree for the same pd->mb would then
file mb to be nil, and panic.

There are two different pd's with
the same pd->mb, and both are calling mbfree. My silly try
was trying to ensure that was the case.