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Can memcpy hang and never return? Yes. Today, I hit an issue where memcpy was not returning, making no forward progress at all, not even a single instruction. 1/3

__memcpy_sve () at ../sysdeps/aarch64/multiarch/memcpy_sve.S:126 126 stp C_q, D_q, [dst, 48] (gdb) bt #0 __memcpy_sve () at ../sysdeps/aarch64/multiarch/memcpy_sve.S:126

Based on the dmesg spew, I can only assume stp was faulting, the kernel was handling it, but failing to page in the needed stuff for the process, but ended up telling it to retry anyway... So it was faulting, and retrying stp over and over again...