What does \'EXC_I386_GPFLT\' mean and how can I troubleshoot it in my BLAS code?

Understanding Exception Code "EXC_I386_GPFLT"

Exception code "EXC_I386_GPFLT" typically indicates a "General Protection Fault" in x86 architecture. However, its interpretation can vary depending on the specific situation and exception type.

In your case, you mentioned an exception of type EXC_BAD_ACCESS accompanied by EXC_I386_GPFLT. This suggests that the exception occurred due to an out-of-bounds memory access. The program context you provided, involving cblas_zgemm() from the BLAS library, may further assist in pinpointing the root cause.

It's important to note that "EXC_I386_GPFLT" does not necessarily imply an out-of-memory condition. It can also occur when the code attempts to use memory in an illegal way, such as:

• Accessing a non-canonical 64-bit pointer, where the upper bits do not conform to the expected pattern
• Performing unaligned access with an SSE register (e.g., accessing a 16-byte SSE register from a non-16-byte aligned address)
• Manipulating segment registers or model specific registers (MSRs) in an unauthorized manner

To resolve this issue, it's crucial to thoroughly examine the code's memory usage and consider possible scenarios where the program may be accessing memory in an invalid or unexpected manner.

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