[Bug 281402] zfs: kmsan reports Uninitialized UMA memory from zio_data_buf_alloc

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=281402

--- Comment #6 from Mark Johnston <markj@FreeBSD.org> ---
(In reply to Alan Somers from comment #5)
Oh, yes, that's quite possible if the accelerated routines are implemented in
assembly or use intrinsics, or there's some bug in the build which causes some
file(s) to be compiled without -fsanitize=kernel-memory.  I believe LLVM has
some ability to instrument inline asm blocks based on the input and output
operand descriptions, not sure if that's relevant here.

It should be possible to use kmsan_mark(buf, sz, KMSAN_STATE_INITED) to
manually mark a region as initialized.  You might also want to use
kmsan_check() to ensure that the inputs are initialized.  I presume that
Linux's KMSAN has similar interfaces, but I'm not sure what those are.

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