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The signal frame was built inside the 128 byte red zone of the interrupted user code and inherited its stack alignment, so a leaf function could lose live data to the siginfo copy and the handler could fault on an SSE access. Build the frame below the red zone, 16 byte aligned; the naked trampoline calls the handler itself and its call provides the return address slot. Signed-off-by: raiden00pl <raiden00@railab.me> Assisted-by: Claude Code |
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