Difference in behaviour with and without rr

[mgaudet]

Ran into an bug where firefox crashes on startup run under rr, but doesn't without.

The details are in this bugzilla bug; I've waffled a bit about whether or not its worth opening an issue, but I really don't quite understand why rr is changing behaviour.

The associated bug has a pernosco trace that points at the proximate cause of the bug, but it seems like the root might be an rr thing?

[khuey]

rr doesn't support DRI and that's probably confusing the driver.

https://github.com/rr-debugger/rr/blob/90e46d55cf019482d80e27bdbdf57a939d395e14/src/preload/preload_interface.h#L585-L598