netdev - Re: [PATCH v7 04/10] selftests/harness: Fix interleaved scheduling leading to race conditions

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Date: Mon, 3 Jun 2024 17:27:43 +0100
From: Mark Brown <broonie@...nel.org>
To: Mickaël Salaün <mic@...ikod.net>
Cc: Christian Brauner <brauner@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jakub Kicinski <kuba@...nel.org>, Kees Cook <keescook@...omium.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Sasha Levin <sashal@...nel.org>,
	Sean Christopherson <seanjc@...gle.com>,
	Shengyu Li <shengyu.li.evgeny@...il.com>,
	Shuah Khan <shuah@...nel.org>,
	Shuah Khan <skhan@...uxfoundation.org>,
	Bagas Sanjaya <bagasdotme@...il.com>,
	Brendan Higgins <brendanhiggins@...gle.com>,
	David Gow <davidgow@...gle.com>,
	"David S . Miller" <davem@...emloft.net>,
	Florian Fainelli <florian.fainelli@...adcom.com>,
	Günther Noack <gnoack@...gle.com>,
	Jon Hunter <jonathanh@...dia.com>, Ron Economos <re@...z.net>,
	Ronald Warsow <rwarsow@....de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Will Drewry <wad@...omium.org>,
	kernel test robot <oliver.sang@...el.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-kselftest@...r.kernel.org,
	netdev@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH v7 04/10] selftests/harness: Fix interleaved scheduling
 leading to race conditions

On Mon, May 27, 2024 at 08:07:40PM +0100, Mark Brown wrote:
> On Sat, May 11, 2024 at 07:14:39PM +0200, Mickaël Salaün 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.
> 
> > 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.
> 
> 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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