Firefox was probing ahead in increments of 2048 bytes in order to ensure that the stack was allocated, but it left the stack pointer at the end of the stack for

Firefox was probing ahead in increments of 2048 bytes in order to ensure that the stack was allocated, but it left the stack pointer at the end of the stack for that whole time. This usually worked ok, but certain versions of Linux will bail if the stack probe is greater than 64kb+256b away from the stack pointer. The new code moves the stack pointer incrementally so that the probe is never more than a single page from the stack pointer. https://phabricator.services.mozilla.com/rMOZILLACENTRAL304d01f5488b384023a1c647e8c5c2f5cee32a5b https://phabricator.services.mozilla.com/rMOZILLACENTRAL304d...