From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f200.google.com (mail-oi1-f200.google.com [209.85.167.200]) (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 C5B08405F7 for ; Sun, 11 Oct 2026 15:19:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.200 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791731976; cv=none; b=M9RFRKD1dvZDO3uq4qjj4VryXPMh6RhqmO+3eVYJWBmveVxTjXVcTcZ7YH0oU0/FLUPnUp1WpvVlAk3ooC8E8fCDDuiKDn8MTDKcdZuryA5yEdws0nO5WcyWq4g2M1lEPdFTzCPkcaHEJ3lqp52K+xgeo4HItJvN/X9tJ71iN0Q= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791731976; c=relaxed/simple; bh=SfZU5QBRdMi/KgNELcecbO6USgMv2hCSJf9T0qU5shI=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=sDlxVZHf6I+n0JtprrBJ01NghUpj8qub5cKB9ZQNZOk435gCWUyKHm4g8b0ZXIhoxtwYAzaGWMNansOBMXkb+DsD9K6IFRTyk+NnbzhEILwj9lDOZcISNOcDqJHJgLeBGUp1Gyie3z2kFOPgEo/v7DTBsfTBPJX7EohjWcFr0eI= 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=209.85.167.200 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-oi1-f200.google.com with SMTP id 5614622812f47-4e937c5bd4fso1301186b6e.2 for ; Sun, 11 Oct 2026 08:19:34 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20260707; t=1791731973; x=1792336773; h=content-type:to:from:subject:message-id:date:mime-version :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to :content-type; bh=/ejP176Rx5rm5jeJ6KaI7hE3f67vqppgEazw/7JP8qc=; b=X+vxUDSvZCgpcTCRCqrpS/Wq4d2ZvRAOarPV9Bx1SiWvNQOXrq89MVKS6aORfEeenB AAwXnoxeVep9DyzC2mt6RbSPh83tLETpcXwDDYkYcAXatS5LhEGI9i82XGoQRBJDAtl8 zng6VEssfgTtGM/92OL/USuYOKh9urEFnctLvef0coQRYp9aFyTQaJh8z7kuDUJmXLGv tip9ECQEmaVq4sCZnVX84zKpIFgbAVgi7l2VH1TWaA/J+aluuERa0CFc9mhhSFY5IggA izmfv8CjDy6BqnN9kQuYE46CqG/0iwpRfKIoQ7sckUPB/PGUi8IHm50DwB9ClIFwx4k8 RklA== X-Forwarded-Encrypted: i=1; AKwUvBy5OodZ9gS+DVfVgbXzGUJkDGYMNL+sorZElC1ZC+r54H7ypNkKukbPiHLF3SIDkHb7jRXjWj3f8PhDrQ==@vger.kernel.org X-Gm-Message-State: AFq9FYK/JYD/Emkf+UUK/5RXLrYsILqBhURHKIg9zacorLFCkrtGidaA IpJNJdJn8c0dj4YO60uJubdGoBzsN5mKtqen6UFzz0XUpM8AnAdiDlj9o8wWJ7rlZzDB+NLwiXM 6gxr+a5mLim0QEcXTJ2Ddx2rl86vvzamsuELisHT0ofAHgrUqvU82pYa3QP4= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:130f:b0:4c3:2e7:55bb with SMTP id 5614622812f47-50c537c68c7mr6581827b6e.38.1791731973659; Sun, 11 Oct 2026 08:19:33 -0700 (PDT) Date: Sun, 11 Oct 2026 08:19:33 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6acba905.8cdf6287.1eb53.00e4.GAE@google.com> Subject: [syzbot] [block?] WARNING: lock held when returning to user space in blk_throtl_init From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Hello, syzbot found the following issue on: HEAD commit: becb95e45ef0 Add linux-next specific files for 20261009 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=119ea68e580000 kernel config: https://syzkaller.appspot.com/x/.config?x=7400eab0484d1dc dashboard link: https://syzkaller.appspot.com/bug?extid=1eb53c83ab8b0a0302a6 compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=100e8999580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=159ea68e580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/b16b9c03e69c/disk-becb95e4.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/78483614b526/vmlinux-becb95e4.xz kernel image: https://storage.googleapis.com/syzbot-assets/e333f1b9fe69/bzImage-becb95e4.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+1eb53c83ab8b0a0302a6@syzkaller.appspotmail.com null_blk: disk nullb1 created ================================================ WARNING: lock held when returning to user space! syzkaller #0 Not tainted ------------------------------------------------ syz.0.452/6787 is leaving the kernel with locks still held! locks held by syz.0.452/6787: 2, last CPU#0: #0: ffff88803652c190 (&q->q_usage_counter(io)#105){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #0: ffff88803652c190 (&q->q_usage_counter(io)#105){++++}-{0:0}, at: blk_throtl_init+0x27b/0x420 block/blk-throttle.c:1332 #1: ffff88803652c1c8 (&q->q_usage_counter(queue)#88){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #1: ffff88803652c1c8 (&q->q_usage_counter(queue)#88){+.+.}-{0:0}, at: blk_throtl_init+0x27b/0x420 block/blk-throttle.c:1332 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup