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Date: Mon, 3 Jun 2024 17:27:43 +0100
From: Mark Brown <broonie@kernel.org>
To: =?iso-8859-1?Q?Micka=EBl_Sala=FCn?= <mic@digikod.net>
Cc: Christian Brauner <brauner@kernel.org>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jakub Kicinski <kuba@kernel.org>, Kees Cook <keescook@chromium.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Sasha Levin <sashal@kernel.org>,
	Sean Christopherson <seanjc@google.com>,
	Shengyu Li <shengyu.li.evgeny@gmail.com>,
	Shuah Khan <shuah@kernel.org>,
	Shuah Khan <skhan@linuxfoundation.org>,
	Bagas Sanjaya <bagasdotme@gmail.com>,
	Brendan Higgins <brendanhiggins@google.com>,
	David Gow <davidgow@google.com>,
	"David S . Miller" <davem@davemloft.net>,
	Florian Fainelli <florian.fainelli@broadcom.com>,
	=?iso-8859-1?Q?G=FCnther?= Noack <gnoack@google.com>,
	Jon Hunter <jonathanh@nvidia.com>, Ron Economos <re@w6rz.net>,
	Ronald Warsow <rwarsow@gmx.de>,
	Stephen Rothwell <sfr@canb.auug.org.au>,
	Will Drewry <wad@chromium.org>,
	kernel test robot <oliver.sang@intel.com>, kvm@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org,
	netdev@vger.kernel.org, stable@vger.kernel.org
Subject: Re: [PATCH v7 04/10] selftests/harness: Fix interleaved scheduling
 leading to race conditions
Message-ID: <187423fb-ec78-4318-9da0-5b27df62b71f@sirena.org.uk>
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On Mon, May 27, 2024 at 08:07:40PM +0100, Mark Brown wrote:
> On Sat, May 11, 2024 at 07:14:39PM +0200, Micka=EBl Sala=FCn wrote:

> > Fix a race condition when running several FIXTURE_TEARDOWN() managing
> > the same resource.  This fixes a race condition in the Landlock file
> > system tests when creating or unmounting the same directory.
>=20
> > Using clone3() with CLONE_VFORK guarantees that the child and grandchild
> > test processes are sequentially scheduled.  This is implemented with a
> > new clone3_vfork() helper replacing the fork() call.
>=20
> This is now in mainline and appears to be causing several tests (at
> least the ptrace vmaccess global_attach test on arm64, possibly also
> some of the epoll tests) that previously were timed out by the harness
> to to hang instead.  A bisect seems to point at this patch in
> particular, there was a bunch of discussion of the fallout of these
> patches but I'm afraid I lost track of it, is there something in flight
> for this?  -next is affected as well from the looks of it.

FWIW I'm still seeing this on -rc2...

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