From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi2-f5.google.com (mail-oi2-f5.google.com [74.125.231.197]) (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 93AD7416878 for ; Wed, 26 Aug 2026 12:22:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=74.125.231.197 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787746955; cv=none; b=dMwfRbFl+WmQS5gAXE98Z9OSTiN4/lvwIP1Ri725uOnsGgn9hCY75iHpIsIUUXy4ijajb8EgQNErpFl6lwppCN5aPVLXUO++ccJQ+m5plKRXhJHWrbtkTbN8D7PcW/srFi95d0WNk33cA0h3ZAmyM0KolKiKWdtIqM+X92KXuAI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1787746955; c=relaxed/simple; bh=vJu/tgezIAyPq/jvVxwLDZ/MvZnGeML+p2SKRSGhOeg=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=F700/bdbVWOLCqJrDBwwE5Vq6fHxUUXB4wi+NvChIQCew/UScO+i3DMT3ypJwdJKX/SGumJnV2s+ftD7ngIeH7DeJuEeRbSGLO0BsS4bUqWLPuxhvjrG6Z1QroWX3w1EyN2NaRkvkmIlNMcmXIF/WXp3lgbpJ5bDsF+FxyHMWy8= 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=74.125.231.197 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-oi2-f5.google.com with SMTP id 5614622812f47-4b3759b7ff0so56016b6e.1 for ; Wed, 26 Aug 2026 05:22:33 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1787746952; x=1788351752; h=content-type:to:from:subject:message-id:in-reply-to:date :mime-version:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to:content-type; bh=P5eo3SCH5j3Fs+ZHwEuof0JMA7kWfr4/TVZy9FrVKM4=; b=aXJv5O/Lc8NCvcUOsSaxIvjB56mk/Aqjb6mlmvUbLbIeWZqUD/90E/0D6Rk8KC81ZH DwTfHK7eAA7pUlMK7A1+I95eT0vqnFjo7jQDAt3taZmopuovfZ+FQtQsgiDAeHPmc4Kr jVl9hyM2brdyD1TDJWteXRK5kYqdEfcO18YEphHC+XZNsVSmz8Yy9BbcXy9ZHnAadI3p 7/W0fGorxQhaKpw8yp/B+1H0Cqe1GSjdleaMWVnkLQmrOISBftcZhQ8f6fg6yDeS3ICp Q0QKY8GPhZmFa3OS3u6DVJR1/ZeDdRfvsEsqjGwVFrtF4D53BsdQn916MvcX5vvxlbAf FEVg== X-Forwarded-Encrypted: i=1; AHgh+Roh0gpBpL/XGhB3NvbJiMRvBOXict5NDRQWmNJ5JIehRgIQI8L4Y+24na2MaTIEirtvSQF7/JWhywqdrw==@vger.kernel.org X-Gm-Message-State: AFuF++mMgkx1K7X6XmSIONK3skrb+5wgpK4gB20Gxkjre4HZ8mDP/nv6 Q+w5Wdlv7EEQ0IGAM/EPI1DZN+fM88oE8BxvpozJJceCNv+6gdQO0xTr78d2e4NjipUEhuwgCPQ 5EeN5IsKSkCve0WW9fA/NECLqNIg9VJM2umJO8XW78evFPPY00cAhxC0sQK0= Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6808:4fd1:b0:4aa:d5f:123e with SMTP id 5614622812f47-4b366b0ea25mr6875968b6e.9.1787746952438; Wed, 26 Aug 2026 05:22:32 -0700 (PDT) Date: Wed, 26 Aug 2026 05:22:32 -0700 In-Reply-To: <6a778cfb.9c11d2ce.289b96.00b7.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a8eda88.1d9ded08.62e62.00ad.GAE@google.com> Subject: Re: [syzbot] [block?] WARNING in blk_mq_free_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" syzbot has found a reproducer for the following issue on: HEAD commit: a8406e6c0b79 Add linux-next specific files for 20260825 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=114f1625580000 kernel config: https://syzkaller.appspot.com/x/.config?x=da8932b2925a9804 dashboard link: https://syzkaller.appspot.com/bug?extid=02b37e31e64ea5cb6d29 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=13dad979580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=10136979580000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/bd019bacac75/disk-a8406e6c.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/e47580ccc38d/vmlinux-a8406e6c.xz kernel image: https://storage.googleapis.com/syzbot-assets/b7909a5638c6/bzImage-a8406e6c.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+02b37e31e64ea5cb6d29@syzkaller.appspotmail.com ------------[ cut here ]------------ timer_delete_sync(&sdp->delay_work) && rcu_segcblist_n_cbs(&sdp->srcu_cblist) WARNING: kernel/rcu/srcutree.c:707 at cleanup_srcu_struct+0x3d6/0x8b0 kernel/rcu/srcutree.c:706, CPU#0: syz.0.1231/9288 Modules linked in: CPU: 0 UID: 0 PID: 9288 Comm: syz.0.1231 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026 RIP: 0010:cleanup_srcu_struct+0x3d6/0x8b0 kernel/rcu/srcutree.c:706 Code: f3 8b 00 48 83 7d 00 00 4c 8b 74 24 10 0f 85 dd 03 00 00 41 ff c5 41 83 e5 0f 41 83 fd 07 0f 86 e2 fe ff ff e9 ab 00 00 00 90 <0f> 0b 90 4c 8d b5 00 02 00 00 4c 89 f3 48 c1 eb 03 48 b8 00 00 00 RSP: 0018:ffffc900033c7cf0 EFLAGS: 00010206 RAX: 1ffffd1ffff81745 RBX: 0000607edaf36940 RCX: dffffc0000000000 RDX: 0000000000000001 RSI: ffffffff8e478a87 RDI: 00000000ffffffff RBP: ffffe8ffffc0b940 R08: ffffffff907a4f7f R09: 1ffffffff20f49ef R10: dffffc0000000000 R11: fffffbfff20f49f0 R12: ffff888054a1e800 R13: 0000000000000000 R14: ffffe8ffffc0ba28 R15: 1ffffffff1ce95de FS: 00007f73abf2d6c0(0000) GS:ffff888124cd5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000200000000100 CR3: 0000000076d8a000 CR4: 00000000003526f0 Call Trace: blk_mq_free_tag_set+0x617/0x790 block/blk-mq.c:4976 loop_remove+0x4e/0xc0 drivers/block/loop.c:2143 loop_control_remove drivers/block/loop.c:2201 [inline] loop_control_ioctl+0x4a6/0x5a0 drivers/block/loop.c:2243 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl+0xfc/0x170 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f73aaf9e0d9 Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007f73abf2d028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f73ab225fa0 RCX: 00007f73aaf9e0d9 RDX: 0000000000000001 RSI: 0000000000004c81 RDI: 0000000000000003 RBP: 00007f73ab035024 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f73ab226038 R14: 00007f73ab225fa0 R15: 00007ffe4f51e5e8 --- 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.