MemoryManager: coalesce initial adjacent compatible regions #2699
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This is to work around an odd behavior in Linux kernel 6.1.6 on Fedora 37 - it sometimes reports two heap regions with identical properties. Rather than further-complicating the heap mapping code, it's probably better to just normalize the initial region map to collapse the heaps into a single region.
We get confusing behavior later if there are multiple heaps; better to bail out earlier. e.g. when debugging shadow#2686 it would have been clearer what was happening if we failed here and didn't try to keep running.
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Codecov ReportBase: 68.06% // Head: 67.66% // Decreases project coverage by
Additional details and impacted files@@ Coverage Diff @@
## main #2699 +/- ##
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- Coverage 68.06% 67.66% -0.41%
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Files 202 202
Lines 30407 30343 -64
Branches 5938 5932 -6
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- Hits 20698 20533 -165
- Misses 5012 5148 +136
+ Partials 4697 4662 -35
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This is to work around an odd behavior in Linux kernel 6.1.6 on Fedora 37 - it sometimes reports two heap regions with identical properties.
Rather than further-complicating the heap mapping code, it's probably better to just normalize the initial region map to collapse the heaps into a single region.
Verified that this fixes the tor-minimal test in a Fedora 37 VM.
Fixes #2692