From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 302B32DF144; Mon, 4 May 2026 07:28:50 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777879732; cv=none; b=OpqrJcnQJh+vWZikLeadMHetViDdjn8GYemqpyNDs4fb0U2NpNQBMYukmEr9bhYknJGg0iOerC9AWT7GiJrL1EZPyizENk6cGPc2CV8PfMCjSV+t2PbDLhixbNmzi+XPC4BjEyXKz6jly48MJ4gGR7Ax6CIrsticmAAc71NEmcA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777879732; c=relaxed/simple; bh=U8grDQsG4o7FCiABmuvMOAKAJ8HFDRDURCKVnfrZHKA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=iO0Y1lOpyZM18IWynt+4kKKCEzWZsVNdmhlkulJUzFXPxRptb2JO8PmkGW6YgO/1WrZW3vzCfxFwQv5wq7pPcDaWC1z1CJwft1hhaSFUiGzmBfz8jgf98/diyblZ9X+oEByanthgT6+eRf+cWe2UFzwc/0srxRxUKwzXu1KLjI4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=lkB0ncpt; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=tQ+TTJPc; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="lkB0ncpt"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tQ+TTJPc" Date: Mon, 4 May 2026 09:28:46 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1777879728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=U8grDQsG4o7FCiABmuvMOAKAJ8HFDRDURCKVnfrZHKA=; b=lkB0ncptDjO+lD0w9K3flKDJovPeaeaIw8NDSAliM1dIacRt6kQQGQB9pQKmdsTxgEo5lg TCdR2MfMWr2JFylxeDeg/AEx9oh0LsLmmauPc3w2udkzICEvBq3wSDLQI03jMtzkbpqv6w 91dcYogTzI8NZpqhP3wz6vaRutTT5Dx+1F7ZlrGrHkn4XSroDxVGm5YDwfI2iulLPWx27X GFf2c3g+OdofvMjbrFyrCJSd2LNyaaQYCJD/P10r5dsPPhwYD+nZljQEHOfEX0ulEJu04s iWD/jr38opR4lOdBqOofm7iMIu3yLuVQ1WL2XSnJ11bFLDR/Klq8Z81KJVPeqw== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1777879728; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=U8grDQsG4o7FCiABmuvMOAKAJ8HFDRDURCKVnfrZHKA=; b=tQ+TTJPcsqIc5w5QGGg/5Oomn1KVNn4g1lIwIImtqX8PhQyW6/+Xqle7GOoLPvuQClk/w4 uSoZbZqe16NWtzAg== From: Sebastian Andrzej Siewior To: Tejun Heo Cc: Martin Pitt , regressions@lists.linux.dev, cgroups@vger.kernel.org, Johannes Weiner , Michal =?utf-8?Q?Koutn=C3=BD?= , David Vernet , Andrea Righi , Changwoo Min , Emil Tsalapatis , sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 cgroup/for-7.1-fixes sched_ext/for-7.1-fixes] cgroup: Defer css percpu_ref kill on rmdir until cgroup is depopulated Message-ID: <20260504072846.qM4LxsIF@linutronix.de> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable In-Reply-To: On 2026-05-01 08:31:22 [-1000], Tejun Heo wrote: > A chain of commits going back to v7.0 reworked rmdir to satisfy the > controller invariant that a subsystem's ->css_offline() must not run while > tasks are still doing kernel-side work in the cgroup. =E2=80=A6 >=20 > Fixes: 1b164b876c36 ("cgroup: Wait for dying tasks to leave on rmdir") > Cc: stable@vger.kernel.org # v7.0+ > Reported-by: Martin Pitt > Link: https://lore.kernel.org/all/afHNg2VX2jy9bW7y@piware.de/ > Link: https://lore.kernel.org/all/35e0670adb4abeab13da2c321582af9f@kernel= =2Eorg/ > Signed-off-by: Tejun Heo > Cc: Sebastian Andrzej Siewior I gave it a quick spin, everything looks fine. Acked-by: Sebastian Andrzej Siewior Sebastian