linux-kernel - Re: [PATCH v4 1/1] selftests/mm/uffd: Refactor non-composite global vars into struct

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Message-ID: <CALkFLL+kPAWcXrmVf8fEWdNcuh0O=s6FVCF4xOUo6PcAOmsrkQ@mail.gmail.com>
Date: Mon, 16 Jun 2025 12:08:24 +0530
From: Ujwal Kundur <ujwal.kundur@...il.com>
To: Brendan Jackman <jackmanb@...gle.com>
Cc: akpm@...ux-foundation.org, peterx@...hat.com, shuah@...nel.org, 
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org, 
	linux-mm@...ck.org
Subject: Re: [PATCH v4 1/1] selftests/mm/uffd: Refactor non-composite global
 vars into struct

> And I hit this:
>
> # -------------------------
> # running ./uffd-unit-tests
> # -------------------------
> # Testing UFFDIO_API (with syscall)... done
> # Testing UFFDIO_API (with /dev/userfaultfd)... done
> # Testing register-ioctls on anon... ERROR: munmap (errno=22, @uffd-common.c:277)
> # done
> # [FAIL]
> not ok 6 uffd-unit-tests # exit=1
>
> It reproduced on a second run but I haven't dug any further at all.

I haven't been able to reproduce this -- both with and without my
patch on mm-new and mainline; I see why you've commented out
uffd-tests in your test script :)
I ran into this *once* earlier when liburing wasn't installed, perhaps
that could be related?

Will send a v5 soon retaining the test_uffdio_copy_eexist variable as suggested.

Thanks,
Ujwal