From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1BE68CA52 for ; Fri, 13 Feb 2026 03:30:44 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.129.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770953446; cv=none; b=ETMxTXjtIg5s5WFuQYPliHgRqolyxaMKKROrqdS4qooX8uQeb7az543tul89dOx2kEqHFUbhHAtI9MilrS+dhXPI9q3ADga07ZHImzrf6f1VOX9cZ2PcWHN6DMC0tuRoRFrGI3vpnNYj4bQlsOTUTMSXQoA3gKJcF6tpp9Z/yK0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770953446; c=relaxed/simple; bh=5/xsuK1J8ymjNXTozkIC1Nkncc9Y8vOTcA3GiRJXtIs=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=YXBQw56uDXTKPaSvCrfrmqvF2Yiwgxt+OyEYKn17jB2tyl8/DUMF0qoI8lSFzKbm5OvmEBED210Z1XWhnA6uEnpqjyX+akdvnEpFCor2SdnUx2hk9ZbgFWZfeXz7v8W/VZre/0SVeLP/TUe2MrGc83YSLdT5qwlwNoOkMaf3zJQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=BDiFBY7f; arc=none smtp.client-ip=170.10.129.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BDiFBY7f" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1770953444; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=jzDTxl6CTj0ch3WNTkNRK3YKSKr4uu0bS+u453hqKz0=; b=BDiFBY7fvRtGlcFanLVYqaqc88ebDgK8OySY6mioERtQmaWrDanKXHsagQh+WyjCGsGq1m zEOPGp795AiuMXgpFEISx62n5zecZAxuO8U/MYLNcvsRG/3dfhNtohAXEhHtn1zDZY9waF nYNqmN4xeO+nl4rvww5nJ/YmlD07p2Y= Received: from mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-505-OuEFIWPJNkicneJWn95Zzg-1; Thu, 12 Feb 2026 22:30:40 -0500 X-MC-Unique: OuEFIWPJNkicneJWn95Zzg-1 X-Mimecast-MFC-AGG-ID: OuEFIWPJNkicneJWn95Zzg_1770953439 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 3791918004BB; Fri, 13 Feb 2026 03:30:39 +0000 (UTC) Received: from fedora (unknown [10.72.116.140]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id F109019560B9; Fri, 13 Feb 2026 03:30:32 +0000 (UTC) Date: Fri, 13 Feb 2026 11:30:27 +0800 From: Ming Lei To: syzbot Cc: axboe@kernel.dk, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [block?] WARNING in wbt_init_enable_default Message-ID: References: <694ce8fd.050a0220.35954c.0035.GAE@google.com> <698e3afa.a70a0220.2c38d7.00a2.GAE@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <698e3afa.a70a0220.2c38d7.00a2.GAE@google.com> X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 On Thu, Feb 12, 2026 at 12:41:30PM -0800, syzbot wrote: > 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 The warning is expected given -ENOMEM is triggered from wbt_alloc(), either kmalloc or percpu allocator. Thanks, Ming