From nobody Tue Aug 25 14:37:04 2026 Received: from mailgw.kylinos.cn (mailgw.kylinos.cn [124.126.103.232]) (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 55E2C3368B7 for ; Fri, 14 Aug 2026 03:26:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=124.126.103.232 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786678006; cv=none; b=m9/75sn0T/VD5K/6CsDwODrE1icL7P6GqA2F+BY9eT4BXD6ZDd0kHQbmJdakMADZAAgNRFQW/Qp9r7hqP3U9jJXWFZl0QZyY7DLJlOoagUJA4PH1oreCEcLd4h6giIPSKcj2zKMn+5MNosvZhZudgpGiN/nuzGgFoXCLghylFXY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786678006; c=relaxed/simple; bh=lYLoh1LZHq3zPir7ePUlWFRsxfJr4BrORnqas9W8isY=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=o2ob30N3WwmN6ttl10FGrcO/55AI9sDY4uQ8/BLJBnyJ8jI/L3mZCy/DA4BoRhrytXhvEdALePkini434OctmXXBGhrtP+cUVszQG49/miLCty8CorCnvpx6sXnGZKdsj4FcnCMa+0/KWVVgD46xs4vama5XJHhPjvsV19F2MMI= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn; spf=pass smtp.mailfrom=kylinos.cn; arc=none smtp.client-ip=124.126.103.232 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=kylinos.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=kylinos.cn X-UUID: f526ddf0978f11f1aa26b74ffac11d73-20260814 X-CID-P-RULE: Release_Ham X-CID-O-INFO: VERSION:1.3.12,REQID:7467b89e-ee33-4cbd-b37b-ddcddec76d1b,IP:0,U RL:0,TC:0,Content:-5,EDM:-20,RT:0,SF:0,FILE:0,BULK:0,RULE:Release_Ham,ACTI ON:release,TS:-25 X-CID-META: VersionHash:e7bac3a,CLOUDID:f144d32afebf51fa57275b8c9eb8af38,BulkI D:nil,BulkQuantity:0,Recheck:0,SF:102|136|850|865|898,TC:nil,Content:0|15| 50,EDM:-19|2|-100,IP:nil,URL:0,File:nil,RT:nil,Bulk:nil,QS:nil,BEC:nil,COL :0,OSI:0,OSA:0,AV:0,LES:1,SPR:NO,DKR:0,DKP:0,BRR:0,BRE:0,ARC:0 X-CID-BVR: 2,SSN|SDN X-CID-BAS: 2,SSN|SDN,0,_ X-CID-FACTOR: TF_CID_SPAM_SNR X-CID-RHF: D41D8CD98F00B204E9800998ECF8427E X-UUID: f526ddf0978f11f1aa26b74ffac11d73-20260814 X-User: fangqiurong@kylinos.cn Received: from localhost.localdomain [(10.44.16.150)] by mailgw.kylinos.cn (envelope-from ) (Generic MTA with TLSv1.3 TLS_AES_256_GCM_SHA384 256/256) with ESMTP id 945877459; Fri, 14 Aug 2026 11:26:37 +0800 From: Qiurong Fang To: tj@kernel.org Cc: void@manifault.com, arighi@nvidia.com, changwoo@igalia.com, sched-ext@lists.linux.dev, linux-kernel@vger.kernel.org Subject: [PATCH] sched_ext: Fix exit_task leak on fork failure during enable Date: Fri, 14 Aug 2026 11:26:23 +0800 Message-Id: <20260814032623.3834952-1-fangqiurong@kylinos.cn> X-Mailer: git-send-email 2.25.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: fangqiurong scx_fork() initializes tasks when scx_init_task_enabled is set, but scx_cancel_fork() only exits them when scx_enabled() is true. A fork that fails in the enable window (between releasing scx_fork_rwsem and setting __scx_enabled) runs ops.init_task() but never ops.exit_task() Gate scx_cancel_fork() on scx_init_task_enabled. Signed-off-by: fangqiurong --- kernel/sched/ext/ext.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/ext/ext.c b/kernel/sched/ext/ext.c index 29967bb130c5..334472b91cd2 100644 --- a/kernel/sched/ext/ext.c +++ b/kernel/sched/ext/ext.c @@ -4177,7 +4177,7 @@ void scx_post_fork(struct task_struct *p) =20 void scx_cancel_fork(struct task_struct *p) { - if (scx_enabled()) { + if (scx_init_task_enabled) { struct rq *rq; struct rq_flags rf; =20 --=20 2.43.0