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https://github.com/linux-apfs/apfstests.git
synced 2026-05-01 15:01:44 -07:00
Ross Zwisler
44f649f632
This adds a regression test for the following kernel patches: mm: avoid spurious 'bad pmd' warning messages dax: Fix race between colliding PMD & PTE entries The above patches fix two related PMD vs PTE races in the DAX code. These can both be easily triggered by having two threads reading and writing simultaneously to the same private mapping, with the key being that private mapping reads can be handled with PMDs but private mapping writes are always handled with PTEs so that we can COW. Without this 2-patch kernel series, the newly added test will result in the following errors: run fstests generic/437 at 2017-05-16 16:53:43 mm/pgtable-generic.c:39: bad pmd ffff8808daa49b88(84000001006000a5) ... a bunch of the bad pmd messages ... BUG: Bad rss-counter state mm:ffff8800a8c1b700 idx:1 val:1 BUG: non-zero nr_ptes on freeing mm: 38 XFS (pmem0p1): Unmounting Filesystem Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Eryu Guan <eguan@redhat.com> Signed-off-by: Eryu Guan <eguan@redhat.com>
62 lines
1.6 KiB
Bash
Executable File
62 lines
1.6 KiB
Bash
Executable File
#! /bin/bash
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# FS QA Test 437
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#
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# This is a regression test for kernel patches:
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# mm: avoid spurious 'bad pmd' warning messages
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# dax: Fix race between colliding PMD & PTE entries
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# created by Ross Zwisler <ross.zwisler@linux.intel.com>
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#
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#-----------------------------------------------------------------------
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# Copyright (c) 2017 Intel Corporation. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write the Free Software Foundation,
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# Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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#-----------------------------------------------------------------------
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#
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seq=`basename $0`
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seqres=$RESULT_DIR/$seq
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echo "QA output created by $seq"
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here=`pwd`
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tmp=/tmp/$$
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status=1 # failure is the default!
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trap "_cleanup; exit \$status" 0 1 2 3 15
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_cleanup()
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{
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cd /
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rm -f $tmp.*
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}
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# get standard environment, filters and checks
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. ./common/rc
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. ./common/filter
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# remove previous $seqres.full before test
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rm -f $seqres.full
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# Modify as appropriate.
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_supported_fs generic
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_supported_os Linux
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_require_test
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_require_test_program "t_mmap_cow_race"
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# real QA test starts here
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src/t_mmap_cow_race $TEST_DIR/testfile
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# success, all done
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echo "Silence is golden"
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status=0
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exit
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