Re: [Bug 216073] New: [s390x] kernel BUG at mm/usercopy.c:101! usercopy: Kernel memory exposure attempt detected from vmalloc 'n o area' (offset 0, size 1)!

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On Tue, Jun 07, 2022 at 05:05:01PM +0200, Alexander Gordeev wrote:
> On Mon, Jun 06, 2022 at 03:13:12PM -0700, Andrew Morton wrote:
> > (switched to email.  Please respond via emailed reply-to-all, not via the
> > bugzilla web interface).
> 
> Hi Zorro,
> 
> Unfortunately, I am not able to reproduce the issue. Could you please
> clarify your test environment details and share your xfstests config?

One of the test environment details as [1]. The xfstests config as [2].
It's easier to reproduce on 64k directory size xfs by running xfstests
auto group.

Thanks,
Zorro

[1]
CPU
Vendor	IBM/S390
Model Name	8561
Family	0
Model	3126312
Stepping	0
Speed	0.0
Processors	2
Cores	0
Sockets	0
Hyper	True
Flags	edat dfp vxp vx vxe ldisp sie vxe2 highgprs etf3eh te vxd gs sort zarch msa stfle dflt eimm esan3
Arch(s)	s390x

Memory	4096 MB
NUMA Nodes	1

Disks
Model	Size	Logical sector size	Physical sector size
3390/0c	41.03 GB / 38.21 GiB	4096 bytes	4096 bytes

[2]
# cat local.config
FSTYP=xfs
TEST_DEV=/dev/loop0
TEST_DIR=/mnt/fstests/TEST_DIR
SCRATCH_DEV=/dev/loop1
SCRATCH_MNT=/mnt/fstests/SCRATCH_DIR
LOGWRITES_DEV=/dev/loop2
MKFS_OPTIONS="-n size=65536 -m crc=1,finobt=1,reflink=1,rmapbt=0,bigtime=1,inobtcount=1"
TEST_FS_MOUNT_OPTS=""

> 
> Thanks!
> 




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