From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from r3-19.sinamail.sina.com.cn (r3-19.sinamail.sina.com.cn [202.108.3.19]) (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 C5DC333F589 for ; Mon, 15 Jun 2026 11:48:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.108.3.19 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781524117; cv=none; b=hckqwqAvd4SQkY3ve/6NM0VvOqQIyH+Ik9G0MRrfhgKY7ZHIm/o/RWaUW74erdX/plG98lYWpmSqza9d3fP6MyUmlPNgnUmkNfUpXIestuvvt3OUpa8xbAu4nKwlwNZhtRJMwtJj0/rfWG6pmyCsQFP0bVGLodw/nRDGVsnugHM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1781524117; c=relaxed/simple; bh=0PuFrhLh6QFPZl4LKjfg3AuZD8+Hk4IB4mk8ITGr2Z8=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=oXrthFcFmcv6tLLQSqZ74kK0hl+wBjmiUDhBd57hSjhNu3UPjCCyvAYVpjWhSSbOzqjc7x5neGc+2I5OWi5/FCA0tJKZNko/5+/BZ9vKYPbSheolAuVhfu6wEE2t2OFRkqpADTx8WJlIehSSWHSt7hXecMAhyRZZizJ622sMZew= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=d1m86z/L; arc=none smtp.client-ip=202.108.3.19 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="d1m86z/L" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1781524113; bh=hwRBylj+c8USqmN/8MoG8uE/rfWwpb+3UsWAvvMjgFI=; h=From:Subject:Date:Message-ID; b=d1m86z/LIm27uZSPHeC9VCo8tWDoDWLhNgDxNf9wQngL0V96077A5swnvgeBjez+P i156PeZHHHvvWbuKeUGBUtUw9Kl92ns2RME5Xt3PoCngU+o58FTDmo7JcCx0JIbmTn X/a3LmqXXWA2x9rPMXp4ES24jHeV/MP+GCmXkXvw= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.62.144]) by sina.com (10.54.253.32) with ESMTP id 6A2FE68300006E94; Mon, 15 Jun 2026 19:48:20 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 005204456603 X-SMAIL-UIID: 8008268A666341A39DA4756E38F72023-20260615-194820-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [cgroups?] INFO: task hung in cgroup_subtree_control_write (2) Date: Mon, 15 Jun 2026 19:48:10 +0800 Message-ID: <20260615114812.1820-1-hdanton@sina.com> In-Reply-To: <6a2fb248.8812e0fc.3c3fa4.001a.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Mon, 15 Jun 2026 01:05:28 -0700 > syzbot has found a reproducer for the following issue on: > > HEAD commit: ec039126b7fa Add linux-next specific files for 20260611 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=178e637a580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=d0d1fa2afcbce17c > dashboard link: https://syzkaller.appspot.com/bug?extid=bb2e19a1190a556c01b1 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=10b0d4ae580000 #syz test --- x/kernel/cgroup/cgroup.c +++ y/kernel/cgroup/cgroup.c @@ -3267,7 +3267,6 @@ restart: if (!css || !css_is_dying(css)) continue; - cgroup_get_live(dsct); prepare_to_wait(&dsct->offline_waitq, &wait, TASK_UNINTERRUPTIBLE); @@ -3275,7 +3274,6 @@ restart: schedule(); finish_wait(&dsct->offline_waitq, &wait); - cgroup_put(dsct); goto restart; } } --