From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f205.google.com (mail-oi1-f205.google.com [209.85.167.205]) (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 C6FD9438472 for ; Tue, 28 Jul 2026 12:58:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.205 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785243506; cv=none; b=OLnY06zqTmdDphXCLKxqhJ242TR7NAhSWgo3xIg1NX/ZSI5OOz7bgmu6Tl4E/cAEdYKbNr+EmKCN+2tQT4Sal5zCRcbgOHF0QlE6omRJ+xNxFQoKm2/RV8hVtJFTvc5ZMXewAnygUNY0SySaadzOvrrrFPUFymi5mbWxGowih6I= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785243506; c=relaxed/simple; bh=ixas0KYKGbKQeKRHRc5bey5LfsdW4XoTh6cWp70bu+Q=; h=MIME-Version:Date:Message-ID:Subject:From:To:Content-Type; b=BO1xpPeozg+pNujozpcflbcRg3xIDWlHVO/1lOSmCIK3dJxta+clEvzFlsVinrp4XSJoNppBlfQXIpHKmeF1fX43SLKRGlLz4p6MO5cZg+Hc0zgMPmuniZJ/zAxgggv62diwWn864rsvFqpYvFbGHaGLuBfXtgoF+TjUgOd2GdA= 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=209.85.167.205 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-f205.google.com with SMTP id 5614622812f47-49ab6a82cd5so5032963b6e.2 for ; Tue, 28 Jul 2026 05:58:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1785243503; x=1785848303; 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=QZLnj6zZUprtiqaAMGSQ88ksQ8rIQm7u/CEFtblZzPQ=; b=i9ZK6qtNxPMXqhbmrZtEsUZMxojm0dKJSzQ2gi2WPsE9UU0Cwhd+aIFx03gJVTuszn 5lQR8bBvyx//JfzM77liTAmaK0TfG3eN8NqKgQUTjpG+CH8ktIRQlunz+q9oJ2WGXiTv DkpA6Zxfm6zdhFokljwtSR9YFPMt8ScVG+clTLrDIKRGF9DJeaUJVdexTEh/ygT0UW6/ wBrQo4eD9OFno2bQRKPTh1s9Yza1u0qPmlfPHOOhm0bp8RAObQQHpa3WQqSlRrdXLvXh Qc9UOBbEUhWvKmbc72I7PcBwJMMtPaXvRI/zN/XRUCKOL/tpUqnA6Zlf8Bahbzhk19rs iz6w== X-Forwarded-Encrypted: i=1; AHgh+Ro00B80QYsQt+hMompiHXX7/ZBbqGJqiPu3/h7DUNUPhKyT5hP+2UBZ2Iw3gGh1UVA37r+BpiH1bMc06Q==@vger.kernel.org X-Gm-Message-State: AOJu0YyuUEYjxo2KMJ5mRQK6LilawmIIXDSR/mqdsbdRk1FJXHVp9axW 05hLW4as2l6gnKKPa4TrE6+P7ikBgxcopHvogG3gdn2vcCddmQIwoIYhNqnq9gWHmQgjo7Z/bYb 0kXt93+d7++C/O6yoLM+6zK7CpWewGuIdCjU3cPfAgDafzb6wuSnpkYldnJA= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:23d4:b0:497:da7f:179e with SMTP id 5614622812f47-4ad5bbd9caamr1454130b6e.38.1785243503340; Tue, 28 Jul 2026 05:58:23 -0700 (PDT) Date: Tue, 28 Jul 2026 05:58:23 -0700 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a68a76f.4c659fcc.19cd90.001c.GAE@google.com> Subject: [syzbot] [block?] WARNING in blk_mq_alloc_tag_set 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: d326f83e819c Merge tag 'net-7.2-rc5' of git://git.kernel.o.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=129f3bde580000 kernel config: https://syzkaller.appspot.com/x/.config?x=5c4196ba0e33631d dashboard link: https://syzkaller.appspot.com/bug?extid=18431bc7dccedc61778f compiler: Debian clang version 22.1.8 (++20260613092233+e80beda6e255-1~exp1~20260613092250.77), Debian LLD 22.1.8 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/9359ac22935d/disk-d326f83e.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/c8a632e638dc/vmlinux-d326f83e.xz kernel image: https://storage.googleapis.com/syzbot-assets/db78e854ce3e/bzImage-d326f83e.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+18431bc7dccedc61778f@syzkaller.appspotmail.com blk-mq: failed to allocate request map ------------[ cut here ]------------ rcu_segcblist_n_cbs(&sdp->srcu_cblist) WARNING: kernel/rcu/srcutree.c:730 at cleanup_srcu_struct+0x369/0x470 kernel/rcu/srcutree.c:730, CPU#1: iou-wrk-11407/11411 Modules linked in: CPU: 1 UID: 0 PID: 11411 Comm: iou-wrk-11407 Tainted: G L syzkaller #0 PREEMPT(full) Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/10/2026 RIP: 0010:cleanup_srcu_struct+0x369/0x470 kernel/rcu/srcutree.c:730 Code: 7c 35 00 00 74 08 4c 89 ff e8 b3 44 89 00 49 c7 07 00 00 00 00 48 83 c4 28 5b 41 5c 41 5d 41 5e 41 5f 5d e9 34 80 65 ff cc 90 <0f> 0b 90 eb e6 90 0f 0b 90 eb e0 90 0f 0b 90 eb da 90 0f 0b 90 eb RSP: 0018:ffffc9001e1f7740 EFLAGS: 00010202 RAX: 1ffffd1ffff92d11 RBX: 1ffffffff1c9f5de RCX: b62894e921e22600 RDX: 0000000000000001 RSI: ffffffff8e4b12ee RDI: ffff888034b93e00 RBP: ffffe8ffffc96888 R08: ffffe8ffffc96927 R09: 1ffffd1ffff92d24 R10: dffffc0000000000 R11: fffff91ffff92d25 R12: ffff8880330a4160 R13: 0000000000000000 R14: dffffc0000000000 R15: 0000607edad447c0 FS: 00007f420a7846c0(0000) GS:ffff888125052000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000029000 CR3: 000000007d20d000 CR4: 0000000000350ef0 Call Trace: blk_mq_alloc_tag_set+0xc77/0x1000 block/blk-mq.c:4928 ublk_ctrl_add_dev+0x903/0xbc0 drivers/block/ublk_drv.c:4797 ublk_ctrl_uring_cmd+0x696/0x7e0 drivers/block/ublk_drv.c:5783 io_uring_cmd+0x2e6/0x8b0 io_uring/uring_cmd.c:271 __io_issue_sqe+0x188/0x4d0 io_uring/io_uring.c:1395 io_issue_sqe+0x16d/0x1020 io_uring/io_uring.c:1418 io_wq_submit_work+0x7ab/0xc90 io_uring/io_uring.c:1534 io_worker_handle_work+0x72e/0x10d0 io_uring/io-wq.c:652 io_wq_worker+0x452/0xf10 io_uring/io-wq.c:706 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 --- 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 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