[Nix-dev] More news about the nix-env crash

[Eelco Dolstra]

Hi,

On 01/19/2012 10:27 PM, Eelco Dolstra wrote:

> On 01/19/2012 10:23 PM, Mathijs Kwik wrote:
>
>> config.nix: https://gist.github.com/1642727
>
> Thanks, this gives me a segfault as well.  Will investigate.

The cause seems to be in some builderDefs code, which is doing an 
equality check ("uniqList") on derivations.  That was always a bad idea 
because it's extremely inefficient, but now it no longer works at all 
because derivations have a self-reference ("drv.out" points back at 
"drv").  This was added to support multiple derivation outputs.  Thus 
uniqList tries to compare infinite data structures, leading to a stack 
overflow.

I'll try to add a workaround.

-- 
Eelco Dolstra | http://www.st.ewi.tudelft.nl/~dolstra/