From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp153-170.sina.com.cn (smtp153-170.sina.com.cn [61.135.153.170]) (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 225A9142E83 for ; Sat, 20 Sep 2025 00:43:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=61.135.153.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758329009; cv=none; b=ZJruAyEPRU+jKd3DH8eWbyrd9+6uK4LBDLFAugz3Hl+KriQx8nc7PyESQFeq//o8tq21CXpGIVBjLhCtr5fl2nlb+iA8Mqc+ltd5gh+tHfq/oOvvJg749bwxx+x932BkV1dAAHJ2+nnnBi3NtDSRoobhu6mTmRY82Pd/WcJpU/w= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758329009; c=relaxed/simple; bh=f7o1/6fyI/Dgz29iamkumHyaL6Nr4mTXYAa2T5l1bEk=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=XJMgW8NlQFk9gZ60b0DiCnVzZY3hVdZWluC7OiYfFhAWgcY+gmWeDybMmTgxIsy2tCS5PUm4oKAbOCzqk8S+ru3ckx80RSsXSPyFqS4fRQyBJcJ0VyEPNdohRFx5/PHSmyNWn2olnn0ts1LR79ZXVJtdOaF5hA4jBVILt1tUTmk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com; spf=pass smtp.mailfrom=sina.com; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b=Kn0hvkLs; arc=none smtp.client-ip=61.135.153.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=sina.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sina.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sina.com header.i=@sina.com header.b="Kn0hvkLs" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sina.com; s=201208; t=1758329000; bh=eNH1ER8sQFY9wrfvTE6Za+mVUUdpcPmPX87FiDNsXrY=; h=From:Subject:Date:Message-ID; b=Kn0hvkLss46Nt0pgHGZE0D4+WSdbPQTK1e9MvdoRkRIlvJqCcFfP437jYzUsMZ6a8 SWYqhXIgDv+zmVQwsYOqhzczFUYvJX9YlU/2bqFECoKV9Dm5rWGb5owyRfweTRvQpq 7Hzq7BPOmD728YtvGM5Ixrg/lhHtMB/pKAUHrCT0= X-SMAIL-HELO: localhost.localdomain Received: from unknown (HELO localhost.localdomain)([114.249.58.236]) by sina.com (10.54.253.34) with ESMTP id 68CDF8A10000357C; Sat, 20 Sep 2025 08:43:15 +0800 (CST) X-Sender: hdanton@sina.com X-Auth-ID: hdanton@sina.com Authentication-Results: sina.com; spf=none smtp.mailfrom=hdanton@sina.com; dkim=none header.i=none; dmarc=none action=none header.from=hdanton@sina.com X-SMAIL-MID: 3220556292143 X-SMAIL-UIID: 28BFA9AC4C0640E28D7EBC84552AB059-20250920-084315-1 From: Hillf Danton To: syzbot Cc: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Subject: Re: [syzbot] [mm?] [usb?] WARNING in __alloc_skb (4) Date: Sat, 20 Sep 2025 08:43:00 +0800 Message-ID: <20250920004306.7233-1-hdanton@sina.com> In-Reply-To: <68af7ed3.a00a0220.2929dc.0004.GAE@google.com> References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit > Date: Wed, 27 Aug 2025 14:55:31 -0700 [thread overview] > Hello, > > syzbot found the following issue on: > > HEAD commit: 7fa4d8dc380f Add linux-next specific files for 20250821 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=11fecc42580000 > kernel config: https://syzkaller.appspot.com/x/.config?x=ae76068823a236b3 > dashboard link: https://syzkaller.appspot.com/bug?extid=5a2250fd91b28106c37b > compiler: Debian clang version 20.1.7 (++20250616065708+6146a88f6049-1~exp1~20250616065826.132), Debian LLD 20.1.7 > syz repro: https://syzkaller.appspot.com/x/repro.syz?x=14c94858580000 > C reproducer: https://syzkaller.appspot.com/x/repro.c?x=108ea7bc580000 #syz test linux-next master --- x/net/core/skbuff.c +++ y/net/core/skbuff.c @@ -657,7 +657,7 @@ struct sk_buff *__alloc_skb(unsigned int likely(node == NUMA_NO_NODE || node == numa_mem_id())) skb = napi_skb_cache_get(); else - skb = kmem_cache_alloc_node(cache, gfp_mask & ~GFP_DMA, node); + skb = kmem_cache_alloc_node(cache, gfp_mask & ~(GFP_DMA | __GFP_HIGHMEM), node); if (unlikely(!skb)) return NULL; prefetchw(skb); --