Hello,

kernel test robot noticed "xfstests.xfs.050.fail" on:

commit: adfb6609c6809e107ded9a1cd46f519c882e64ea ("mm/huge_memory: initialise the tags of the huge zero folio")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master

[test failed on      linus/master 24172e0d79900908cf5ebf366600616d29c9b417]
[test failed on linux-next/master 2666975a8905776d306bee01c5d98a0395bda1c9]

in testcase: xfstests
version: xfstests-x86_64-c4980080-1_20251110
with following parameters:

	disk: 4HDD
	fs: xfs
	test: xfs-050



config: x86_64-rhel-9.4-func
compiler: gcc-14
test machine: 4 threads Intel(R) Xeon(R) CPU E3-1225 v5 @ 3.30GHz (Skylake) with 16G memory

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


If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <oliver.sang@intel.com>
| Closes: https://lore.kernel.org/oe-lkp/202511131537.1a31ee77-lkp@intel.com

2025-11-12 08:41:57 cd /lkp/benchmarks/xfstests
2025-11-12 08:41:58 export TEST_DIR=/fs/sda1
2025-11-12 08:41:58 export TEST_DEV=/dev/sda1
2025-11-12 08:41:58 export FSTYP=xfs
2025-11-12 08:41:58 export SCRATCH_MNT=/fs/scratch
2025-11-12 08:41:58 mkdir /fs/scratch -p
2025-11-12 08:41:58 export SCRATCH_DEV=/dev/sda4
2025-11-12 08:41:58 export SCRATCH_LOGDEV=/dev/sda2
2025-11-12 08:41:58 export SCRATCH_XFS_LIST_METADATA_FIELDS=u3.sfdir3.hdr.parent.i4
2025-11-12 08:41:58 export SCRATCH_XFS_LIST_FUZZ_VERBS=random
2025-11-12 08:41:58 echo xfs/050
2025-11-12 08:41:58 ./check xfs/050
FSTYP         -- xfs (non-debug)
PLATFORM      -- Linux/x86_64 lkp-skl-d06 6.18.0-rc5-00021-gadfb6609c680 #1 SMP PREEMPT_DYNAMIC Wed Nov 12 16:23:37 CST 2025
MKFS_OPTIONS  -- -f /dev/sda4
MOUNT_OPTIONS -- /dev/sda4 /fs/scratch

xfs/050       - output mismatch (see /lkp/benchmarks/xfstests/results//xfs/050.out.bad)
    --- tests/xfs/050.out	2025-11-10 16:50:07.000000000 +0000
    +++ /lkp/benchmarks/xfstests/results//xfs/050.out.bad	2025-11-12 08:42:21.560701373 +0000
    @@ -47,8 +47,6 @@
     [NAME] 0 200 1000 00 [--------] 1 4 10 00 [--------] 0 0 0 00 [--------]
     
     *** push past the soft inode limit
    -[ROOT] 0 0 0 00 [--------] 3 0 0 00 [--------] 0 0 0 00 [--------]
    -[NAME] 0 200 1000 00 [--------] 5 4 10 00 [7 days] 0 0 0 00 [--------]
     
     *** push past the soft block limit
    ...
    (Run 'diff -u /lkp/benchmarks/xfstests/tests/xfs/050.out /lkp/benchmarks/xfstests/results//xfs/050.out.bad'  to see the entire diff)
Ran: xfs/050
Failures: xfs/050
Failed 1 of 1 tests


we observed the test still can pass randomly. as below, it failed 23 times out
of 30 runs for adfb6609c6, we confirmed the left 7 runs really pass.

and parent can always pass.

9a6b60cb147d5396 adfb6609c6809e107ded9a1cd46
---------------- ---------------------------
       fail:runs  %reproduction    fail:runs
           |             |             |
           :30          77%          23:30    xfstests.xfs.050.fail
           :30          70%          21:30    dmesg.boot_failures
           :30          70%          21:30    dmesg.segfault_at_ip_sp_error

another thing is while xfstests.xfs.050 failed, we can normally observe
dmesg.segfault_at_ip_sp_error

the dmesg uploaded to [1] by bot happened not have sefault, one dmesg with
sefault attached FYI.


[   57.010698][ T5703] xfs_quota[5703]: segfault at 560559699610 ip 00007ff5a817e3c9 sp 00007ffecf38e6d8 error 4 in libc.so.6[1643c9,7ff5a8042000+165000] likely on CPU 2 (core 2, socket 0)

...


[   69.439214][ T7404] xfs_quota[7404]: segfault at 562ade6ae290 ip 00007f28b30283c9 sp 00007ffe1e8fb188 error 4 in libc.so.6[1643c9,7f28b2eec000+165000] likely on CPU 2 (core 2, socket 0)


The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251113/202511131537.1a31ee77-lkp@intel.com [1]



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