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

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=216073

--- Comment #7 from Zorro Lang (zlang@redhat.com) ---
On Wed, Jun 08, 2022 at 09:13:12PM +0200, Alexander Gordeev wrote:
> On Wed, Jun 08, 2022 at 10:19:22AM +0800, Zorro Lang wrote:
> > 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 for the details, Zorro!
> 
> Do you create test and scratch device with xfs_io, as README suggests?
> If yes, what are sizes of the files?

# fallocate -l 5G /home/test_dev.img
# fallocate -l 10G /home/scratch_dev.img
Then create loop devices.


> Also, do you run always xfs/auto or xfs/294 hits for you reliably?

100% for on my testing, I tried 10 times, then hit it 10 times last
weekend. Will test again this week.

> 
> Thanks!
>

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