runtime: stop when we run out of hints in race mode
Currently, the runtime falls back to asking for any address the OS can offer for the heap when it runs out of hint addresses. However, the race detector assumes the heap lives in [0x00c000000000, 0x00e000000000), and will fail in a non-obvious way if we go outside this region. Fix this by actively throwing a useful error if we run out of heap hints in race mode. This problem is currently being triggered by TestArenaCollision, which intentionally triggers this fallback behavior. Fix the test to look for the new panic message in race mode. Fixes #24670. Updates #24133. Change-Id: I57de6d17a3495dc1f1f84afc382cd18a6efc2bf7 Reviewed-on: https://go-review.googlesource.com/104717 Run-TryBot: Austin Clements <austin@google.com> Reviewed-by:Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
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