From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 221C8C4332F for ; Fri, 10 Nov 2023 17:58:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229843AbjKJR6U (ORCPT ); Fri, 10 Nov 2023 12:58:20 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59890 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230376AbjKJR4U (ORCPT ); Fri, 10 Nov 2023 12:56:20 -0500 Received: from mail-pl1-f200.google.com (mail-pl1-f200.google.com [209.85.214.200]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 29553446E0 for ; Fri, 10 Nov 2023 09:28:57 -0800 (PST) Received: by mail-pl1-f200.google.com with SMTP id d9443c01a7336-1cc323b2aa3so22434245ad.3 for ; Fri, 10 Nov 2023 09:28:57 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699637336; x=1700242136; 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=VmV6Kif29Knmt9wgqkox65kgMA6S46Dxa7pWtbIajeU=; b=I+vmw1m29xk5YnMdz3jXHE/u9uFG0nJiMPaZxuTGtzm9sWcoGayU5sdLT4nTPZ2Em1 zdwvORut+FA+CzHcg4bDhANUi3BEPoiayUT7xSFH91B1F+fi7gtIMZn0LxhNi62uLvee rHu/Vn2oueIDxKS5VNkNssxXZP1nlX2oWv8roNJTGIi2/okZRvVx+tJDsi1jU/zq+gGk adTteYiXyU2FMV4GkZADy22INkU/sjzCO5sHwObadd22NZ2V2QSuRVs/6zAHYOmYLHX2 abCEA8eAuE6EOj0r4RF72X7eZkpSOYwZtXhi7tGOamg/c4J3TqFu9BZpNH5yktbIrRJg Re+Q== X-Gm-Message-State: AOJu0YwbbKuKhMct9loR9sq/UDsGTAhiRZJyLgMTImwDZXQdy9y413BJ 1AeLwyxEFEDtEOMih/unUQ1EAGkEPTjzu/6ZYt2QpoAtRCLKWpc= X-Google-Smtp-Source: AGHT+IFjc3aHnFZdw8p5AiZLNWzW5OAdNOe/i5nwK8y6CGof6c7hJwrfIja2r6UQPPNeVfsxkAwg1zmbR3PTOcUhEEVymllx79Qc MIME-Version: 1.0 X-Received: by 2002:a17:902:efc1:b0:1cc:2bd6:b54a with SMTP id ja1-20020a170902efc100b001cc2bd6b54amr1366011plb.10.1699637336729; Fri, 10 Nov 2023 09:28:56 -0800 (PST) Date: Fri, 10 Nov 2023 09:28:56 -0800 In-Reply-To: <000000000000ade4f305fc36868f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000b3ef1b0609cfa7c5@google.com> Subject: Re: [syzbot] Discardable change From: syzbot To: linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org, syzkaller-bugs@googlegroups.com. *** Subject: Discardable change Author: yuran.pereira@hotmail.com #syz test: https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux.git master --- drivers/usb/core/devio.c | 2 ++ include/linux/page_ext.h | 1 + 2 files changed, 3 insertions(+) diff --git a/drivers/usb/core/devio.c b/drivers/usb/core/devio.c index 3beb6a862e80..22ae7babf46b 100644 --- a/drivers/usb/core/devio.c +++ b/drivers/usb/core/devio.c @@ -276,12 +276,14 @@ static int usbdev_mmap(struct file *file, struct vm_area_struct *vma) if (remap_pfn_range(vma, vma->vm_start, virt_to_phys(usbm->mem) >> PAGE_SHIFT, size, vma->vm_page_prot) < 0) { + pr_info("==> if* vma_use_count %d\n", usbm->vma_use_count); dec_usb_memory_use_count(usbm, &usbm->vma_use_count); return -EAGAIN; } } else { if (dma_mmap_coherent(hcd->self.sysdev, vma, mem, dma_handle, size)) { + pr_info("==> else* vma_use_count %d\n", usbm->vma_use_count); dec_usb_memory_use_count(usbm, &usbm->vma_use_count); return -EAGAIN; } diff --git a/include/linux/page_ext.h b/include/linux/page_ext.h index be98564191e6..fb3e7dcfbffb 100644 --- a/include/linux/page_ext.h +++ b/include/linux/page_ext.h @@ -84,6 +84,7 @@ extern void page_ext_put(struct page_ext *page_ext); static inline void *page_ext_data(struct page_ext *page_ext, struct page_ext_operations *ops) { + pr_info("==> offset = %ld\n", ops->offset); return (void *)(page_ext) + ops->offset; } -- 2.25.1