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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To: Zorro Lang <zlang@xxxxxxxxxx>
Subject: 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)!
From: Alexander Gordeev <agordeev@xxxxxxxxxxxxx>
Date: Wed, 8 Jun 2022 21:13:12 +0200
Cc: bugzilla-daemon@xxxxxxxxxx, linux-s390@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
In-reply-to: <20220608021922.n2izu7n4yoadknkx@zlang-mailbox>
References: <bug-216073-27@https.bugzilla.kernel.org/> <20220606151312.6a9d098c85ed060d36519600@linux-foundation.org> <Yp9pHV14OqvH0n02@li-4a3a4a4c-28e5-11b2-a85c-a8d192c6f089.ibm.com> <20220608021922.n2izu7n4yoadknkx@zlang-mailbox>

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

Thanks!

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Follow-Ups:
- 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)!
  - From: Zorro Lang
- 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)!
  - From: Zorro Lang

References:
- 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)!
  - From: Andrew Morton
- 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)!
  - From: Alexander Gordeev
- 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)!
  - From: Zorro Lang

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