Eelco Dolstra
24b739817f
It was holding on to a Value* (i.e. a std::shared_ptr<ValidPathInfo>*) outside of the pathInfoCache lock, so the std::shared_ptr could be destroyed between the release of the lock and the decrement of the std::shared_ptr refcount. This can happen if more than 'path-info-cache-size' paths are added in the meantime, *or* if clearPathInfoCache() is called. The hydra-queue-runner queue monitor thread periodically calls the later, so is likely to trigger a crash. Fixes https://github.com/NixOS/hydra/issues/542.
Nix, the purely functional package manager
Nix is a new take on package management that is fairly unique. Because of its purity aspects, a lot of issues found in traditional package managers don't appear with Nix.
To find out more about the tool, usage and installation instructions, please read the manual, which is available on the Nix website at http://nixos.org/nix/manual.
Contributing
Take a look at the Hacking Section of the manual. It helps you to get started with building Nix from source.
License
Nix is released under the LGPL v2.1
This product includes software developed by the OpenSSL Project for use in the OpenSSL Toolkit.