linux-kernel - Re: [PATCH v1 3/3] selftests/mm: add tests for HWPOISON hugetlbfs read

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Date:   Tue, 23 May 2023 15:35:46 +0800
From:   kernel test robot <oliver.sang@...el.com>
To:     Jiaqi Yan <jiaqiyan@...gle.com>
CC:     <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-mm@...ck.org>,
        <mike.kravetz@...cle.com>, <songmuchun@...edance.com>,
        <naoya.horiguchi@....com>, <shy828301@...il.com>,
        <linmiaohe@...wei.com>, <akpm@...ux-foundation.org>,
        <linux-kernel@...r.kernel.org>, <duenwen@...gle.com>,
        <axelrasmussen@...gle.com>, <jthoughton@...gle.com>,
        Jiaqi Yan <jiaqiyan@...gle.com>, <oliver.sang@...el.com>
Subject: Re: [PATCH v1 3/3] selftests/mm: add tests for HWPOISON hugetlbfs
 read



Hello,

kernel test robot noticed "kernel-selftests.mm.hugepage-vmemmap.fail" on:

(we know that this commit adds hugetlb-read-hwpoison test, so we actually
want to seek some advice by this report, below will mention further)

commit: d84de15119b74f10be3c0a369561ca9b452d07d7 ("[PATCH v1 3/3] selftests/mm: add tests for HWPOISON hugetlbfs read")
url: https://github.com/intel-lab-lkp/linux/commits/Jiaqi-Yan/mm-hwpoison-find-subpage-in-hugetlb-HWPOISON-list/20230518-003149
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git f1fcbaa18b28dec10281551dfe6ed3a3ed80e3d6
patch link: https://lore.kernel.org/all/20230517160948.811355-4-jiaqiyan@google.com/
patch subject: [PATCH v1 3/3] selftests/mm: add tests for HWPOISON hugetlbfs read

in testcase: kernel-selftests
version: kernel-selftests-x86_64-60acb023-1_20230329
with following parameters:

	sc_nr_hugepages: 2
	group: mm

test-description: The kernel contains a set of "self tests" under the tools/testing/selftests/ directory. These are intended to be small unit tests to exercise individual code paths in the kernel.
test-url: https://www.kernel.org/doc/Documentation/kselftest.txt


compiler: gcc-11
test machine: 36 threads 1 sockets Intel(R) Core(TM) i9-10980XE CPU @ 3.00GHz (Cascade Lake) with 32G memory

(please refer to attached dmesg/kmsg for entire log/backtrace)


If you fix the issue, kindly add following tag
| Reported-by: kernel test robot <oliver.sang@...el.com>
| Closes: https://lore.kernel.org/oe-lkp/202305231450.c71d2b01-oliver.sang@intel.com


from below log [1], the new added hugetlb-read-hwpoison test passed.
but will fail while running hugepage-vmemmap test later as:

# selftests: mm: hugepage-vmemmap
# mmap: Cannot allocate memory
not ok 10 selftests: mm: hugepage-vmemmap # exit=1

hugepage-vmemmap can pass while testing with parent kernel, as below [2]

at the same time, we observed lots of
"Not enough free huge pages to test, exiting!"
for various testing.

any advice for this behavior?

BTW, the system upon which we did this test has 32G memory.
not sure if there is a recommended memory size to run these tests?

Thanks!

[1]
(from test log for this d84de15119 kernel)

# selftests: mm: hugetlb-madvise
# Not enough free huge pages to test, exiting!
not ok 5 selftests: mm: hugetlb-madvise # exit=1
# selftests: mm: hugetlb-read-hwpoison
#  !!! read failed: Input/output error
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  !!! mmap for primary mapping failed: Cannot allocate memory
#  ... Write/read chunk size=0x800
# HugeTLB read regression test...
#  ... expect to read 0x200000 bytes of data in total
#  ... actually read 0x200000 bytes of data in total
# HugeTLB read regression test...TEST_PASSED
# HugeTLB read HWPOISON test...
#  ... expect to read 0x101000 bytes of data in total
#  ... actually read 0x101000 bytes of data in total
# HugeTLB read HWPOISON test...TEST_PASSED
# HugeTLB seek then read HWPOISON test...
#  ... init val=4 with offset=0x102000
#  ... expect to read 0xfe000 bytes of data in total
#  ... actually read 0xfe000 bytes of data in total
# HugeTLB seek then read HWPOISON test...TEST_PASSED
#  ... Write/read chunk size=0x1000
# HugeTLB read regression test...
# HugeTLB read regression test...TEST_SKIPPED
# HugeTLB read HWPOISON test...
# HugeTLB read HWPOISON test...TEST_SKIPPED
# HugeTLB seek then read HWPOISON test...
# HugeTLB seek then read HWPOISON test...TEST_SKIPPED
#  ... Write/read chunk size=0x2000
# HugeTLB read regression test...
# HugeTLB read regression test...TEST_SKIPPED
# HugeTLB read HWPOISON test...
# HugeTLB read HWPOISON test...TEST_SKIPPED
# HugeTLB seek then read HWPOISON test...
# HugeTLB seek then read HWPOISON test...TEST_SKIPPED
#  ... Write/read chunk size=0x4000
# HugeTLB read regression test...
# HugeTLB read regression test...TEST_SKIPPED
# HugeTLB read HWPOISON test...
# HugeTLB read HWPOISON test...TEST_SKIPPED
# HugeTLB seek then read HWPOISON test...
# HugeTLB seek then read HWPOISON test...TEST_SKIPPED
ok 6 selftests: mm: hugetlb-read-hwpoison
# selftests: mm: hugepage-mmap
# mmap: Cannot allocate memory
not ok 7 selftests: mm: hugepage-mmap # exit=1
# selftests: mm: hugepage-mremap
# mmap1: Cannot allocate memory
# Map haddr: Returned address is 0xffffffffffffffff
not ok 8 selftests: mm: hugepage-mremap # exit=1
# selftests: mm: hugepage-shm
# shmget: Cannot allocate memory
not ok 9 selftests: mm: hugepage-shm # exit=1
# selftests: mm: hugepage-vmemmap
# mmap: Cannot allocate memory
not ok 10 selftests: mm: hugepage-vmemmap # exit=1


[2]
(from test log for parent kernel)

# selftests: mm: hugetlb-madvise
# Not enough free huge pages to test, exiting!
not ok 5 selftests: mm: hugetlb-madvise # exit=1
# selftests: mm: hugepage-mmap
# mmap: Cannot allocate memory
not ok 6 selftests: mm: hugepage-mmap # exit=1
# selftests: mm: hugepage-mremap
# mmap1: Cannot allocate memory
# Map haddr: Returned address is 0xffffffffffffffff
not ok 7 selftests: mm: hugepage-mremap # exit=1
# selftests: mm: hugepage-shm
# shmget: Cannot allocate memory
not ok 8 selftests: mm: hugepage-shm # exit=1
# selftests: mm: hugepage-vmemmap
# Returned address is 0x7f6024e00000 whose pfn is 1b8600
ok 9 selftests: mm: hugepage-vmemmap


To reproduce:

        git clone https://github.com/intel/lkp-tests.git
        cd lkp-tests
        sudo bin/lkp install job.yaml           # job file is attached in this email
        bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run
        sudo bin/lkp run generated-yaml-file

        # if come across any failure that blocks the test,
        # please remove ~/.lkp and /lkp dir to run from a clean state.



-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki



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