[Bug 221014] New: selftest kvm:guest_memfd_test returns 22 (Invalid argument) when the number of NUMA nodes are larger than 8

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=221014

            Bug ID: 221014
           Summary: selftest kvm:guest_memfd_test returns 22 (Invalid
                    argument) when the number of NUMA nodes are larger
                    than 8
           Product: Virtualization
           Version: unspecified
          Hardware: All
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P3
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: yi1.lai@intel.com
        Regression: No

Kernel under test: https://github.com/torvalds/linux/releases/tag/v6.19-rc7

Test case: selftest kvm:guest_memfd_test

Bug description:

The execution of case kvm:guest_memfd_test returns errno 22 (Invalid argument).
./guest_memfd_test
Random seed: 0x6b8b4567
==== Test Assertion Failure ====
include/numaif.h:13: !r
pid=2028402 tid=2028402 errno=22 - Invalid argument
1 0x0000000000403d2b: kvm_get_mempolicy at numaif.h:13
2 (inlined by) test_mbind at guest_memfd_test.c:95
3 (inlined by) __test_guest_memfd at guest_memfd_test.c:378
4 0x0000000000402b8c: test_guest_memfd at guest_memfd_test.c:399
5 (inlined by) main at guest_memfd_test.c:489
6 0x00007efc8f42a60f: ?? ??:0
7 0x00007efc8f42a6bf: ?? ??:0
8 0x0000000000402db4: _start at ??:?
get_mempolicy failed, rc: -1 errno: 22 (Invalid argument)

The system under test has more than 8 NUMA nodes. When calling the
get_mempolicy() syscall, it uses a fixed value of maxnode (8) for the buffer
size which causes the syscall return error of invalid argument.

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