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+The issue revolves around a misaligned stack address when handling signals in QEMU for x86_64 userspace. The problem occurs because the signal handler's stack pointer is not properly aligned according to the x86_64 ABI, leading to a crash due to an incorrect `movaps` instruction.
+
+The key points from the bug report are:
+
+1. **Problem**: Applications crash in signal handlers due to a misaligned stack address causing a `movaps` instruction to fail.
+2. **Symptom**: The crash is reported as a NULL dereference, but GDB shows it's actually caused by a misaligned stack.
+3. **Technical Detail**: The x86_64 psABI requires that the stack pointer (`%rsp`) be aligned to a 16-byte boundary when entering a function. However, QEMU's signal handling code does not ensure this alignment when transferring control to the signal handler.
+4. **Relevant Code**: The problematic code in `signal.c` adjusts the stack pointer without properly aligning it for x86_64, leading to an unaligned address being used in the signal handler.
+
+Given that the issue is related to incorrect handling of stack alignment during signal delivery in QEMU's runtime environment, the appropriate category is:
+
+**runtime**
+
+This classification fits because the error occurs dynamically during execution (at runtime) and is not directly tied to a specific instruction or system call but rather to how the runtime environment (QEMU) manages the stack for signal handlers.
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