From nobody Sun Oct 5 14:31:47 2025 Received: from mail-io1-f71.google.com (mail-io1-f71.google.com [209.85.166.71]) (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 A5FAD1F099C for ; Sat, 2 Aug 2025 12:54:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.71 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754139261; cv=none; b=XWyMdLrQ1iFEfuQ9g7sYG/M5jvZVhTCWdTFWvAWg7mPL8Tn7cifxXtcRbm48u5wYufGN4LKRb/WOEH6wg1WJKQEWcrydw133SEYb/rdDki07NV4X4sxkABzHLyZKmwOcDxXxVoGfGZ/Kfdq7M/qdqNRDZkha8aPY3EaCVXOOdwY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1754139261; c=relaxed/simple; bh=sVoqlJeN0kH8f7+EMVAczPaQekri7zRIqXD0QihzrkI=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=MA1e1MOKmiepK4NI2m0SmCV3fFeg6G2/8Tf/eDE41KxKCbNmd4j/l7lo2gXmn1mC0jRvZqjIDsSCQpWH/medgZnSAzuZICNNRvEouAK5GprJFQqLOr1V4/DiEvzYwYPZ3Ee96LOGBZiOyah+rQL2rTTwjIFtpafarxBwrbzSSmU= 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=209.85.166.71 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-io1-f71.google.com with SMTP id ca18e2360f4ac-87c707bfeb6so168584339f.2 for ; Sat, 02 Aug 2025 05:54:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754139257; x=1754744057; h=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=3OBecpoJJO70BCBu/HlWNXeJXFHw4YD4HRwva99qg84=; b=Entm7qzWA+2cCxTiq+8VAwblOmrfYuQHxdV0cK/xQW68U+O0rPgZlchhlDYEJpDA5T tJJwiansq5vztFZkDGpfUpCgPnDkLr+Hg04cxJxV8SdiD/PCSyqeUGQJdQzBM5WNWQ2q Mr8tsMCziNL84JzCo7/60unrd2omM6NZdXCVDgsTQD60h3FKRane2E8QgQKGhYhCsrYQ ESUxmWNyAkUuYo2zVx0O20jNW1YhiMV6rSaEQGEv+2a0FWgLpTjiJm/AHtYH3JHJqEZ4 f7IJ87QbxMVI8ODroxRM86S12tg7wT+9k8Skk4BP9rGOhVmZGtP6JrA8Z8h9clWR5Y1M +c7A== X-Gm-Message-State: AOJu0Yxhad6JO2mJmkG0hXdQ5LXbcpQnPR/Ctp5gCVuP+Zg41z0lcNdh q4ehwxDDr1TqwcHEPWFiEGKrIB8JbNt3x1gqEId8v3bcF9YiVEyADSLiD1Hjw7n5GvZt0AhlANF t8Vyn9v2sh4kTQ+R4KHJNavL+Cs0kYtw5/Zc94lEheyoTAWSzBe3AGsKtDDs= X-Google-Smtp-Source: AGHT+IHE5CiqdAMUDsiU0Whh8ubStGnFDaAY1+n8tAeFL77I5W2dbAKi/pNs5NgSk3tbm+YIpfqkYTXuaFk4Y8wCH7eHTU0eNS21 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6602:da:b0:874:e108:8e3a with SMTP id ca18e2360f4ac-881683e7e9dmr520022039f.12.1754139256821; Sat, 02 Aug 2025 05:54:16 -0700 (PDT) Date: Sat, 02 Aug 2025 05:54:16 -0700 In-Reply-To: <6834671a.a70a0220.253bc2.0098.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <688e0a78.a70a0220.249f57.0000.GAE@google.com> Subject: Forwarded: Re: Fix reported __del_gendisk deadlock From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Re: Fix reported __del_gendisk deadlock Author: ujwal.kundur@gmail.com #syz test diff --git a/block/genhd.c b/block/genhd.c index c26733f6324b..bad731186189 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -819,9 +819,11 @@ void del_gendisk(struct gendisk *disk) disable_elv_switch(disk->queue); memflags =3D memalloc_noio_save(); + mutex_lock(&set->tag_list_lock); down_read(&set->update_nr_hwq_lock); __del_gendisk(disk); up_read(&set->update_nr_hwq_lock); + mutex_unlock(&set->tag_list_lock); memalloc_noio_restore(memflags); } } --=20 2.30.2