Currently, reftests fail under content process sandboxing (bug 790923) because the Marionette listener uses FileUtils to access a file in TmpD, which unneccesarily tries to mkdir() the temporary directory; mkdir() is not on the system call whitelist, so the process is killed. Longer-term we plan to remove open(), so the file access will have to be converted to use IPC, but for now we're just trying to get the tests to pass, and avoiding the mkdir is a workaround.

Are we sure the TmpD directory will always be available? It seems it will on b2g devices, but can you run this through try?

Trying: https://tbpl.mozilla.org/?tree=Try&rev=7652083a87d4

This mkdir call is used in Marionette tests, and we'll need to test against those. I'll push the patch against try once it opens again.

trying: https://tbpl.mozilla.org/?tree=Try&rev=17ad8e4a5701

Tried by :philor with slightly different options: https://tbpl.mozilla.org/?tree=Try&rev=3afe8abb055f

Comment on attachment 8335653 [details] [diff] [review] bugNNNNNN-marionette-mkdir-workaround.diff Review of attachment 8335653 [details] [diff] [review]: ----------------------------------------------------------------- Looks good, thanks!

→ b2g-inbound

Update commit message to make things nicer for the checkin-people; no change to diff. Carrying over r+(mdas).