From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-il1-f200.google.com (mail-il1-f200.google.com [209.85.166.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9C73BEED4 for ; Sat, 20 Apr 2024 06:09:25 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713593366; cv=none; b=nvQ7UUidIGO5o803ujWTRdvMVlu5fbfCAsjyUUItM5F/u/BtPWBQnP2eEH9+S9nqkc+d/uZklIIE9cW+anq9fVzXtK1N6MdxHpIoNMDZGD6qe4KKuW9bVfriTFi1ibcaYZWxdnTE7w6zH1MOxnCEH5sBb87z8sxjP3kMh/9mKbo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713593366; c=relaxed/simple; bh=YvORPu34qUfCvuW9YDmuHUpwtQJ9BEJqVuwhDkLUbGM=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To:Cc: Content-Type; b=BSRdMsaRu/c1oXOnwhBSmylG4MFHXYcA8ODUpr2yPXqD/9vwVIkw/nzKA3NGeNRqgkQwdWf91CPAfEar6mBKXsp6UYSL1M53Y2O3VByewV16G1JKHwG//d79WIeQP+j4sQP48CtCEa5KU/4WvVUZCkZY//ehUgSPQUB9raBhx54= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com; arc=none smtp.client-ip=209.85.166.200 Authentication-Results: smtp.subspace.kernel.org; dmarc=fail (p=none dis=none) header.from=syzkaller.appspotmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=M3KW2WVRGUFZ5GODRSRYTGD7.apphosting.bounces.google.com Received: by mail-il1-f200.google.com with SMTP id e9e14a558f8ab-36a0f6b6348so36380105ab.3 for ; Fri, 19 Apr 2024 23:09:25 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1713593365; x=1714198165; h=cc:to:from:subject:message-id:in-reply-to:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=CSBrUKj2KXuFI1bsasQooiETjY8WhvG2rehRzAjNDzc=; b=SxGGNuEGh8z5IGZOUxsJfNrRsqKY6bAO3egHh4kCtNJf16aNWsF/quaR1qqcycJt25 3Mf3fFHQHPaczjpVUEaXgG3Vgu5SP5YPWwia2dd3yj6q5Q0Wuw8b7STR6V9w8fi70FFx d1Bq9El10D1egnDuWP9Oq3QE3MzW0deRe9M5jEvTycwgQxR4+V/oos0SJ4uw1b/bk0xP OZ5IDBkTRP/qktwkpGBajpEno9/el8PIib9gU89VR7TjaTMsE2WA27bozi6EcqRMK4As I1V0tWIyt/XsKanBVZctklQu5l7qApZx87nVawzJe0bRwQfXVZREKBzFYP6Y/i6ZIbPo Q+Yw== X-Forwarded-Encrypted: i=1; AJvYcCU2tpgDX5gKcRE9qHklomDzsHoKD8x60pTv+li3qYJFlkLb2IUDLQzNtu3knP6ipADoyd9mZ+oJ5RgysdrdsitsNzNs5Ns8okiUmLbC X-Gm-Message-State: AOJu0Yzh509zU98ZT/1zeJaHFDXRvjn/pA9k91jQ/QHPyRibFg9e/Z4B DrjcEKUsoJQlbgpwdQTAv19PIL2Hx0743axYzG6yI7YIpbVGR/n2C0qrMz6PdHn23tzYyKW3DyU Ui3fw90THu2eHZ8oZkwFbY+TNR2nRro/STVN9a5Mn9U7hy4HzM/xfhvQ= X-Google-Smtp-Source: AGHT+IHEuS+5G1A6tHnGKSWyJ8rV34djcXq4G09BKsVajg+GRqXrjWkjzYH+KW9yfFRM3TFM4ng5N5JqJzbinwbT/C12Y8z+NrkC Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6e02:188d:b0:36a:3615:33e4 with SMTP id o13-20020a056e02188d00b0036a361533e4mr263090ilu.4.1713593364865; Fri, 19 Apr 2024 23:09:24 -0700 (PDT) Date: Fri, 19 Apr 2024 23:09:24 -0700 In-Reply-To: <20240420060919.62280-1-aha310510@gmail.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000cd73500616810b77@google.com> Subject: Re: [syzbot] [hams?] possible deadlock in serial8250_console_write From: syzbot To: aha310510@gmail.com Cc: aha310510@gmail.com, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" > please test deadlock in serial8250_console_write > > #syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master This crash does not have a reproducer. I cannot test it. > > --- > drivers/net/ppp/ppp_async.c | 4 ++-- > 1 file changed, 2 insertions(+), 2 deletions(-) > > diff --git a/drivers/net/ppp/ppp_async.c b/drivers/net/ppp/ppp_async.c > index c33c3db3cc08..d12b8155e839 100644 > --- a/drivers/net/ppp/ppp_async.c > +++ b/drivers/net/ppp/ppp_async.c > @@ -134,11 +134,11 @@ static struct asyncppp *ap_get(struct tty_struct *tty) > { > struct asyncppp *ap; > > - read_lock(&disc_data_lock); > + read_lock_irq(&disc_data_lock); > ap = tty->disc_data; > if (ap != NULL) > refcount_inc(&ap->refcnt); > - read_unlock(&disc_data_lock); > + read_unlock_irq(&disc_data_lock); > return ap; > } > > -- > 2.34.1