From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oa1-f72.google.com (mail-oa1-f72.google.com [209.85.160.72]) (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 A882F314D2B for ; Thu, 12 Feb 2026 20:41:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.72 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770928892; cv=none; b=B7nyOE8m/pU2mUNLNaNOGu/RqwNg0+hQQBM2hz1LUf1dMeiWnRpIyESrmC2FZDvVDweX8aUCYCVHLc+Q47W75hCUBslS9OWuTUJ4pgITbp4PoHjGIvuX6KgTKsfuf995jJ6g69IUvH6yhZOp7dibL+bRlHugOvKc5eR3wZSscK8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770928892; c=relaxed/simple; bh=2rJc9284bfT0wClE628kg22SZbLGXbOyKOVWW8Ck5QE=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=ftx8QDNeR7CtPtJZVt8xdtJCCJqtKLkZkVhBLsXZ3MQGOXU1K8/JpvjMm3jggL0uMm5ix3WsjupttqlD18unTUmpNkdsCNgMg0pZdyjE8i+xHdXSyS3i1yfuyBo3jNBncyW05g4/q3Nb88VoF9UlwH3TiA/vyiqYuw0PPXRO2yM= 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=209.85.160.72 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-oa1-f72.google.com with SMTP id 586e51a60fabf-40996e43ddaso1265238fac.3 for ; Thu, 12 Feb 2026 12:41:31 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1770928890; x=1771533690; 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=HNLeUUUoeeCWrw2wdb5o3YAkYZ655djCQOfadDovkk4=; b=VVXIz3cDAAUJhNxf/NpNYZ4oa9kRdS4OdEYbqHirQvQiQM/BcwLfqoPcGfNpOXqSP8 EZIJudWMAM00NTnkppuUZgce0v9bD4GfS2ux236dXEMujcN1DuIF0DYwurthc/w3/GeV aUdWLZCBb6OdJcjnedB1nEj2cwE3won/cpMBgs2EHRCrv+UWlxQG2V86pPcKQf7EtJEu /ZZQE+2DrR0lgzDU3/ctEzzhtYmKJ2rZG1lFI5i0ISb6Jf22KH3d0iRh8ws5egu0t0Z3 gW0MTs2sV5zYLZ2r+pBNoE7UZ6mi1LF1yiyZa0kNl2tN8bD5weKx2x0mWS36kjMqkapb jbXQ== X-Forwarded-Encrypted: i=1; AJvYcCXPgWBM/9CyIqpAwJxnNTypVvjUAaD/wiYIgFgeUZT/lBbs0p6Ann7/A9FxWlmobShfgahebbOjF9Fxz/M=@vger.kernel.org X-Gm-Message-State: AOJu0Yy3h2JTEQePqM2KyloiBp0ccfdZk2f1+WGyihz6buGSV0UKQDzn K/P8hxt2gUzMvpmopbx3wjSWhO2XKuOFhnrv1275CwXekdao3wKqAMqoQjgq6WtuR32k0MSTr3j HxQu0UzgDwHA7XWm5C2nX2Knge+6EnyVdktvvvmaOouLjOiY/CCPiHlVeQhI= Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6820:4c10:b0:662:f543:5d4b with SMTP id 006d021491bc7-67724e6750cmr47454eaf.75.1770928890693; Thu, 12 Feb 2026 12:41:30 -0800 (PST) Date: Thu, 12 Feb 2026 12:41:30 -0800 In-Reply-To: <694ce8fd.050a0220.35954c.0035.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <698e3afa.a70a0220.2c38d7.00a2.GAE@google.com> Subject: Re: [syzbot] [block?] WARNING in wbt_init_enable_default From: syzbot To: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, ming.lei@redhat.com, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: 37a93dd5c49b Merge tag 'net-next-7.0' of git://git.kernel... git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=14342c02580000 kernel config: https://syzkaller.appspot.com/x/.config?x=a512b4a06724b76a dashboard link: https://syzkaller.appspot.com/bug?extid=71fcf20f7c1e5043d78c compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16ffbdb2580000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=11542eef980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/0dedaafff2ad/disk-37a93dd5.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/aa7fae081497/vmlinux-37a93dd5.xz kernel image: https://storage.googleapis.com/syzbot-assets/9096b39b53e1/bzImage-37a93dd5.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+71fcf20f7c1e5043d78c@syzkaller.appspotmail.com 0x000000000001-0x000000020000 : "" ftl_cs: FTL header corrupt! "mq-deadline" elevator initialization, failed -12, falling back to "none" ------------[ cut here ]------------ !rwb WARNING: block/blk-wbt.c:784 at wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784, CPU#0: syz.0.23/6066 Modules linked in: CPU: 0 UID: 0 PID: 6066 Comm: syz.0.23 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/24/2026 RIP: 0010:wbt_init_enable_default+0xcb/0x120 block/blk-wbt.c:784 Code: df e8 d9 cc a2 06 4c 89 e7 e8 e1 38 00 00 48 89 df e8 29 56 a2 06 e8 04 76 2b fd 5b 5d 41 5c e9 9b 22 a4 06 e8 f6 75 2b fd 90 <0f> 0b 90 eb 81 e8 eb 75 2b fd 90 0f 0b 90 48 b8 00 00 00 00 00 fc RSP: 0018:ffffc90003b3f590 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff88803364e000 RCX: 0000000000000040 RDX: ffff88802e719e40 RSI: ffffffff84daf70a RDI: ffffffff8bfa9120 RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: ffffffff82708ed4 R12: ffff88802b37a620 R13: ffff88803364e390 R14: ffff88802b37a630 R15: ffff88803364e090 FS: 00007f472043f6c0(0000) GS:ffff8881245a5000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00002000000da000 CR3: 000000007affe000 CR4: 00000000003526f0 Call Trace: blk_register_queue+0x39e/0x4e0 block/blk-sysfs.c:942 __add_disk+0x73f/0xe40 block/genhd.c:528 add_disk_fwnode+0x118/0x5c0 block/genhd.c:597 add_mtd_blktrans_dev+0xd0b/0x1520 drivers/mtd/mtd_blkdevs.c:382 mtdblock_add_mtd+0x1cc/0x270 drivers/mtd/mtdblock.c:333 blktrans_notify_add drivers/mtd/mtd_blkdevs.c:464 [inline] blktrans_notify_add+0xa2/0xf0 drivers/mtd/mtd_blkdevs.c:456 add_mtd_device+0xbe3/0x1750 drivers/mtd/mtdcore.c:820 mtd_add_partition+0x30a/0x660 drivers/mtd/mtdpart.c:279 mtdchar_blkpg_ioctl+0x207/0x250 drivers/mtd/mtdchar.c:562 mtdchar_ioctl+0x1670/0x1fd0 drivers/mtd/mtdchar.c:1218 mtdchar_unlocked_ioctl+0xb0/0xf0 drivers/mtd/mtdchar.c:1241 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:597 [inline] __se_sys_ioctl fs/ioctl.c:583 [inline] __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0x106/0xf80 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f471f59bf79 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:00007f472043f028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007f471f816090 RCX: 00007f471f59bf79 RDX: 0000000000000000 RSI: 0000000000001269 RDI: 0000000000000004 RBP: 00007f471f6327e0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007f471f816128 R14: 00007f471f816090 R15: 00007ffe9ebc84a8 --- 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.