[Bug 60543] New: ntdll: on macOS, check_invalid_gsbase() mistakes page-straddling access violations for %gs faults and retries them forever

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=60543

            Bug ID: 60543
           Summary: ntdll: on macOS, check_invalid_gsbase() mistakes
                    page-straddling access violations for %gs faults and
                    retries them forever
           Product: Wine
           Version: unspecified
          Hardware: arm
                OS: MacOS
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: ntdll
          Assignee: [e-mail]
          Reporter: [e-mail]
  Target Milestone: ---

On macOS, Diablo II: Resurrected (launched from Battle.net) hangs at startup
with a black window; the main thread spins in signal handling.

Cause: an access violation on an instruction that straddles into an
inaccessible page is mistaken by check_invalid_gsbase() for a %gs fault and
silently retried forever. D2R's copy protection decrypts code pages on demand
through exactly this kind of fault, so it retries ~40,000 times per second and
never progresses.

Patch: https://github.com/SergioB/d2r-macos-wine-fix/tree/main/patches (0001)
Full analysis:
https://github.com/SergioB/d2r-macos-wine-fix/blob/main/docs/investigation.m...

Environment: MacBook Air M3, macOS 26.6.2, Wine 11.0, D2R 3.3.93847, Battle.net
2.53.5.
Reproduced on vanilla Wine: [version]

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