Why fstests g/673 and g/683~687 suddently fail (on xfs, ext4...) on latest linux v6.1+ ?

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Hi,

fstests generic/673 and generic/683~687 are a series of test cases to
verify suid and sgid bits are dropped properly. xfs-list writes these
cases to verify xfs behavior follows vfs, e.g. [1]. And these cases
test passed on xfs and ext4 for long time. Even on my last regression
test on linux v6.1-rc8+, they were passed too.

But now the default behavior looks like be changed again, xfs and ext4
start to fail [2] on latest linux v6.1+ (HEAD [0]), So there must be
changed. I'd like to make sure what's changed, and if it's expected?

Thanks,
Zorro

[0]
commit f9ff5644bcc04221bae56f922122f2b7f5d24d62
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date:   Sat Dec 17 08:55:19 2022 -0600

    Merge tag 'hsi-for-6.2' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-h

[1]
commit e014f37db1a2d109afa750042ac4d69cf3e3d88e
Author: Darrick J. Wong <djwong@xxxxxxxxxx>
Date:   Tue Mar 8 10:51:16 2022 -0800

    xfs: use setattr_copy to set vfs inode attributes

[2]
FSTYP         -- xfs (debug)
PLATFORM      -- Linux/s390x ibm-z-510 6.1.0+ #1 SMP Sat Dec 17 13:23:59 EST 2022
MKFS_OPTIONS  -- -f -m crc=1,finobt=1,reflink=1,rmapbt=0,bigtime=1,inobtcount=1 -b size=1024 /dev/loop1
MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/loop1 /mnt/fstests/SCRATCH_DIR

generic/673       - output mismatch (see /var/lib/xfstests/results//generic/673.out.bad)
    --- tests/generic/673.out	2022-12-17 13:57:40.336589178 -0500
    +++ /var/lib/xfstests/results//generic/673.out.bad	2022-12-18 00:00:53.627210256 -0500
    @@ -51,7 +51,7 @@
     310f146ce52077fcd3308dcbe7632bb2  SCRATCH_MNT/a
     2666 -rw-rwSrw- SCRATCH_MNT/a
     3784de23efab7a2074c9ec66901e39e5  SCRATCH_MNT/a
    -2666 -rw-rwSrw- SCRATCH_MNT/a
    +666 -rw-rw-rw- SCRATCH_MNT/a
     
     Test 10 - qa_user, group-exec file, only sgid
    ...
    (Run 'diff -u /var/lib/xfstests/tests/generic/673.out /var/lib/xfstests/results//generic/673.out.bad'  to see the entire diff)
Ran: generic/673
Failures: generic/673
Failed 1 of 1 tests

FSTYP         -- xfs (debug)
PLATFORM      -- Linux/s390x ibm-z-510 6.1.0+ #1 SMP Sat Dec 17 13:23:59 EST 2022
MKFS_OPTIONS  -- -f -m crc=1,finobt=1,reflink=1,rmapbt=0,bigtime=1,inobtcount=1 -b size=1024 /dev/loop1
MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/loop1 /mnt/fstests/SCRATCH_DIR

generic/683       - output mismatch (see /var/lib/xfstests/results//generic/683.out.bad)
    --- tests/generic/683.out	2022-12-17 13:57:40.696589178 -0500
    +++ /var/lib/xfstests/results//generic/683.out.bad	2022-12-18 00:04:55.297220255 -0500
    @@ -33,7 +33,7 @@
     
     Test 9 - qa_user, non-exec file falloc, only sgid
     2666 -rw-rwSrw- TEST_DIR/683/a
    -2666 -rw-rwSrw- TEST_DIR/683/a
    +666 -rw-rw-rw- TEST_DIR/683/a
     
     Test 10 - qa_user, group-exec file falloc, only sgid
    ...
    (Run 'diff -u /var/lib/xfstests/tests/generic/683.out /var/lib/xfstests/results//generic/683.out.bad'  to see the entire diff)
Ran: generic/683
Failures: generic/683
Failed 1 of 1 tests

FSTYP         -- xfs (debug)
PLATFORM      -- Linux/s390x ibm-z-510 6.1.0+ #1 SMP Sat Dec 17 13:23:59 EST 2022
MKFS_OPTIONS  -- -f -m crc=1,finobt=1,reflink=1,rmapbt=0,bigtime=1,inobtcount=1 -b size=1024 /dev/loop1
MOUNT_OPTIONS -- -o context=system_u:object_r:root_t:s0 /dev/loop1 /mnt/fstests/SCRATCH_DIR

generic/684       - output mismatch (see /var/lib/xfstests/results//generic/684.out.bad)
    --- tests/generic/684.out	2022-12-17 13:57:40.766589178 -0500
    +++ /var/lib/xfstests/results//generic/684.out.bad	2022-12-18 00:05:27.597220255 -0500
    @@ -33,7 +33,7 @@
     
     Test 9 - qa_user, non-exec file fpunch, only sgid
     2666 -rw-rwSrw- TEST_DIR/684/a
    -2666 -rw-rwSrw- TEST_DIR/684/a
    +666 -rw-rw-rw- TEST_DIR/684/a
     
     Test 10 - qa_user, group-exec file fpunch, only sgid
    ...
    (Run 'diff -u /var/lib/xfstests/tests/generic/684.out /var/lib/xfstests/results//generic/684.out.bad'  to see the entire diff)
Ran: generic/684
Failures: generic/684
Failed 1 of 1 tests
....
....


Thanks,
Zorro




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