From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 183241DB13A; Sat, 12 Sep 2026 14:44:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789224262; cv=none; b=DWvvm4nM6kUOorhx9J5YWEYNMroNOPyXGnrucO2bXarUDxETp8KPBURPEiJsg9BCK+xhOHDZqrOgp+G8Ev0Yd8WL3GMSe8Q7mjrBroq6PZXGlUyjxQi6wrGh9Ai22bY35++20nrqfqxuhFHG7AgUMCtyrP8PqEVeQR6hGs50nKM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1789224262; c=relaxed/simple; bh=rxVp/SzwxyD6Pf7fRR9Nv4vsWufTmtDuK9wAvVYjeIc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=jP9odurEik/z8LIzQnJBwbS+A+9iKY+2Upxq0sEQ7lP8tMLKalxEK9f2zPXgSaSU9vxsJ8AahAqHuie9BbYHHdc2fxn1lYFHFBzFGA0QY5X6sEbUp4uMvOfB4BkJKRUKiO2aZzgIAulMPp4q5rpGs7BXdguKG96ajX0L/3gmm24= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=fE9PC+7x; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="fE9PC+7x" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 685E81F000FF; Sat, 12 Sep 2026 14:44:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1789224261; bh=MC07acqUg3vgHYotEMs06W7nUt0PYBjW+7M1kxEZAvQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=fE9PC+7xeu6ERCl84WKY9lpbWzbWPHXVAJJCzbPV+xKw2SFZqB6ZDsQb7JJsdsVvX qitZbqECwvb4VZBV/XDDTJUsVT7QqoytFAezj0bsboduR/38ZaN2MNSz7iQz3PNFVs 4LskyaneMT3CRCgh96vbs4ZScSDON9/k0qZXiUCQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, syzbot+cae54346a70bbceeff2c@syzkaller.appspotmail.com, Joshua Crofts , Ryusuke Konishi , Viacheslav Dubeyko , Sasha Levin Subject: [PATCH 6.6 0905/1424] nilfs2: fix infinite loop in nilfs_clean_segments() Date: Sat, 12 Sep 2026 08:55:37 +0200 Message-ID: <20260912065627.590492002@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260912065607.279695368@linuxfoundation.org> References: <20260912065607.279695368@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Joshua Crofts [ Upstream commit ce5a5ad1a8330a2fcfdd9ec2ab341be739e89a18 ] syzbot reported a hung task in nilfs_transaction_begin(). This occurs because the cleaner ioctl falls into an infinite loop if nilfs_segctor_construct() repeatedly returns -EROFS (e.g. the device is remounted as read-only after an I/O error). Currently in nilfs_clean_segments(), if err is non-zero, it logs the error and sleeps but doesn't abort when it encounters a terminal error like -EROFS. This causes the thread to loop forever. Fix this by breaking out of the loop if nilfs_segctor_construct() returns -EROFS. This matches the behaviour in nilfs_segctor_write_out(), which also handles -EROFS. Reported-by: syzbot+cae54346a70bbceeff2c@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=cae54346a70bbceeff2c Fixes: 9ff05123e3bf ("nilfs2: segment constructor") Assisted-by: gemini:gemini-3.1-pro Signed-off-by: Joshua Crofts Acked-by: Ryusuke Konishi Signed-off-by: Viacheslav Dubeyko Signed-off-by: Sasha Levin --- fs/nilfs2/segment.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c index b1730b1d88ba4..94458afcd5294 100644 --- a/fs/nilfs2/segment.c +++ b/fs/nilfs2/segment.c @@ -2553,6 +2553,10 @@ int nilfs_clean_segments(struct super_block *sb, struct nilfs_argv *argv, break; nilfs_warn(sb, "error %d cleaning segments", err); + + if (unlikely(err == -EROFS)) + goto out_unlock; + set_current_state(TASK_INTERRUPTIBLE); schedule_timeout(sci->sc_interval); } -- 2.53.0