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 6906FC4332F for ; Fri, 10 Nov 2023 18:48:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235876AbjKJSs5 (ORCPT ); Fri, 10 Nov 2023 13:48:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33316 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229464AbjKJSsk (ORCPT ); Fri, 10 Nov 2023 13:48:40 -0500 Received: from mail-pl1-f199.google.com (mail-pl1-f199.google.com [209.85.214.199]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0D95125A32 for ; Fri, 10 Nov 2023 10:06:56 -0800 (PST) Received: by mail-pl1-f199.google.com with SMTP id d9443c01a7336-1cc385e90e2so24590155ad.3 for ; Fri, 10 Nov 2023 10:06:56 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1699639560; x=1700244360; 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=NOPr7WA48CNkb4Z7X3OUT0iM6kqe+sbIYsR+7oE9+DY=; b=i440yKDf/XflnmkM6soHwXrzIxwelKqQdwSPzNzYJq6ImywmeS16T6sDIoT0toZkNw 8V7UyuYhxBCo56AfKK1P2IZeZxcLDrb+lwHnLiYfPMxw4i+0ZEDZnET7U3KFACYzQ+rR UEOd/aikuHmdGEpOGyxlXCvtwTq/zeeG/Nck/znsHIXjQVaFZERhrxRRUHHRCNu4jKZx HEuAvushv1cCu7r/CjZ3JdjcK/uAFtXl+NfH0ZkSfc8S5qZ/Di0n5nqzIAPzqCL8oSCq cvGHt7o+ywGzVURKiaTFZpnufv0E7KE1wg/2cbW+hzMvFngj7P08UgBm15Q5te99Tc7d eq2Q== X-Gm-Message-State: AOJu0Ywex9sdRHJ+ekX3mnNxDIxf64L8WccxtG0Vufqgw0gpeVZSci8Y pH9TdvFQCb6i84xLgeqP77vPoxVfK6Qi6yh5AHKEh8CD8j45lkE= X-Google-Smtp-Source: AGHT+IGfz9DB+i/oSfaVIXH1My/xEdMl1rBniQhcEOkHtI1QuMurFSzWNUY0jb+Mh+mJoqIdvHlcsYBYm1RmiQH/l/fs8pKoQLq+ MIME-Version: 1.0 X-Received: by 2002:a17:903:48c:b0:1cc:ec22:da2b with SMTP id jj12-20020a170903048c00b001ccec22da2bmr8212plb.3.1699639560713; Fri, 10 Nov 2023 10:06:00 -0800 (PST) Date: Fri, 10 Nov 2023 10:06:00 -0800 In-Reply-To: <000000000000ade4f305fc36868f@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000433d410609d02c38@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 ++ mm/page_table_check.c | 2 ++ 2 files changed, 4 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/mm/page_table_check.c b/mm/page_table_check.c index af69c3c8f7c2..ef0fb410cf10 100644 --- a/mm/page_table_check.c +++ b/mm/page_table_check.c @@ -142,6 +142,8 @@ void __page_table_check_zero(struct page *page, unsigned int order) for (i = 0; i < (1ul << order); i++) { struct page_table_check *ptc = get_page_table_check(page_ext); + pr_info("===> anon check_zero %d\n", atomic_read(&ptc->anon_map_count)); + pr_info("===> fmap check_zero %d\n", atomic_read(&ptc->file_map_count)); BUG_ON(atomic_read(&ptc->anon_map_count)); BUG_ON(atomic_read(&ptc->file_map_count)); page_ext = page_ext_next(page_ext); -- 2.25.1