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If a Linux 2.6 kernel is compiled with OABI/EABI concurrent support enabled why do ALSA audio applications fail with bad ioctl errors?

April 26, 2017ALSA compiled concurrent enabled Kernel linux support

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If a Linux 2.6 kernel is compiled with OABI/EABI concurrent support enabled why do ALSA audio applications fail with bad ioctl errors?

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The EABI compatability causes the kernel internal data structures to be built with EABI alignments. This causes ioctl() calls which contain binary data structures (such as ALSA) to fail because the structure size and packing has changed. There is no known workaround except to build the kernel for only the required ABI.