The patch titled
Subject: selftests/memfd: clean up mapping in mfd_fail_write
has been added to the -mm tree. Its filename is
selftests-memfd-clean-up-mapping-in-mfd_fail_write.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/selftests-memfd-clean-up-mapping-in-mfd_fail_write.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/selftests-memfd-clean-up-mapping-in-mfd_fail_write.patch
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------------------------------------------------------
From: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Subject: selftests/memfd: clean up mapping in mfd_fail_write
Running the memfd script ./run_hugetlbfs_test.sh will often end in error
as follows:
memfd-hugetlb: CREATE
memfd-hugetlb: BASIC
memfd-hugetlb: SEAL-WRITE
memfd-hugetlb: SEAL-FUTURE-WRITE
memfd-hugetlb: SEAL-SHRINK
fallocate(ALLOC) failed: No space left on device
./run_hugetlbfs_test.sh: line 60: 166855 Aborted (core dumped) ./memfd_test hugetlbfs
opening: ./mnt/memfd
fuse: DONE
If no hugetlb pages have been preallocated, run_hugetlbfs_test.sh will
allocate 'just enough' pages to run the test. In the SEAL-FUTURE-WRITE
test the mfd_fail_write routine maps the file, but does not unmap. As a
result, two hugetlb pages remain reserved for the mapping. When the
fallocate call in the SEAL-SHRINK test attempts allocate all hugetlb
pages, it is short by the two reserved pages.
Fix by making sure to unmap in mfd_fail_write.
Link: https://lkml.kernel.org/r/20220219004340.56478-1-mike.kravetz@xxxxxxxxxx
Signed-off-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Joel Fernandes <joel@xxxxxxxxxxxxxxxxx>
Cc: Shuah Khan <shuah@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
tools/testing/selftests/memfd/memfd_test.c | 1 +
1 file changed, 1 insertion(+)
--- a/tools/testing/selftests/memfd/memfd_test.c~selftests-memfd-clean-up-mapping-in-mfd_fail_write
+++ a/tools/testing/selftests/memfd/memfd_test.c
@@ -455,6 +455,7 @@ static void mfd_fail_write(int fd)
printf("mmap()+mprotect() didn't fail as expected\n");
abort();
}
+ munmap(p, mfd_def_size);
}
/* verify PUNCH_HOLE fails */
_
Patches currently in -mm which might be from mike.kravetz@xxxxxxxxxx are
selftests-vm-cleanup-hugetlb-file-after-mremap-test.patch
selftests-memfd-clean-up-mapping-in-mfd_fail_write.patch
mm-enable-madv_dontneed-for-hugetlb-mappings.patch
selftests-vm-add-hugetlb-madvise-madv_dontneed-madv_remove-test.patch
userfaultfd-selftests-enable-hugetlb-remap-and-remove-event-testing.patch
hugetlb-clean-up-potential-spectre-issue-warnings.patch
