From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-io1-f69.google.com (mail-io1-f69.google.com [209.85.166.69]) (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 777DF16F0C6 for ; Thu, 1 Aug 2024 09:27:39 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.166.69 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722504460; cv=none; b=CW83As9H/jMHJcB3yrAwx2s9Y1pe007vPaVq6TJRjsYGR1l825Zy59HsOZxY+n/et4zX2wgrDa9sqVvw71/dSJcT8JwhBSWFdEAKOD0mXlzEqg0jZEnBqYV4K5C+mvdCtJthTPJ2vom2QstxB/ZHBJiG3LUualHzP1+5cQRbpiI= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722504460; c=relaxed/simple; bh=d8xVrIxIJS/LZCYRzRHq2tAQuVH6PQJxFYCVBQiDgxc=; h=MIME-Version:Date:In-Reply-To:Message-ID:Subject:From:To: Content-Type; b=P2E5Yo4irDnMi+13V9DnaCnphHvRga+7eEPUzj7Pdr99jaSLRXkfgOMEguWwPr0njrvmD3GJ7TCVDAw8oRLHz6N9jQaDzRPEov4FhYUYHtj02Url8Hi/JVwrAjhrnPsL4aPz7I4Xg88snmcmwJop7fK4rxpTiYv/pkHH/vPebWQ= 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=209.85.166.69 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-io1-f69.google.com with SMTP id ca18e2360f4ac-81d1b92b559so963694839f.0 for ; Thu, 01 Aug 2024 02:27:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1722504458; x=1723109258; 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=VIonP/BFiJflBMTc5yK7BLFJBcF91eCVmFXkU7cn3LY=; b=JgjBjV9UCsoo+aZdqqGzVjqZhwVq/nW0J/JaTgd4e7jpquL6MRUkvoxYp1FXNXHzmS XDEuR/f8YpC1v35m7t/hz3qWg6HMPn8TOd/O4xm0cmBwitjfMlKanSEvGYiiGtcL+vfF O6ge5qHn60D9KwT3M63fIjIiE4NKpcHTWUg4NbS4vqJGH2r4xLRxhuEhyaRBGX/7x+ZN Mx91DymSjP977ztKK2kjeWXZBvqw1p0fWwIri/LR39cgZE5oY/omAPAupzyV6K1ApKIS xk7Wy0kobpk+ufbDoBGV/i0Lw542j/mjl8TKm2DiX4LoUw4dUm4bShdbsPOahtVLNE7u 3kyw== X-Gm-Message-State: AOJu0YxbgNFq2a2/8x2zyasfHVXONvoJ/huWTt9BWyTUfhDtWHcrSP8T 8VU7hCDdHjgseBz4dDALAfZUnPDOC4NyBPNr7KCaqAJthv+GdW3Lb9Re6h+rIhNH599MIFE1iXl cheebouM4marEPtqEkfAZmwjCz2i/PIHD16BqojJlAI/aBGYqIg0CvEs= X-Google-Smtp-Source: AGHT+IHLgFKnuBEqRJxkd9FIZ0AO9h8M8dY+FcnX2LZ9gEYcpAItjcMLn5RNT1JHz29gWGvwp8pBzO3sV+o+EMaB1bAjl1wy8SCk Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Received: by 2002:a05:6638:14d0:b0:4b9:b122:d07d with SMTP id 8926c6da1cb9f-4c8c9cd172fmr86596173.4.1722504458622; Thu, 01 Aug 2024 02:27:38 -0700 (PDT) Date: Thu, 01 Aug 2024 02:27:38 -0700 In-Reply-To: <000000000000a90e8c061e86a76b@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <000000000000616c0e061e9bd272@google.com> Subject: Re: [syzbot] Re: [syzbot] [squashfs?] KMSAN: uninit-value in pick_link From: syzbot To: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" For archival purposes, forwarding an incoming command email to linux-kernel@vger.kernel.org. *** Subject: Re: [syzbot] [squashfs?] KMSAN: uninit-value in pick_link Author: lizhi.xu@windriver.com why folio not inited? #syz test: upstream 2f8c4f506285 diff --git a/mm/filemap.c b/mm/filemap.c index 657bcd887fdb..b76a13395299 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -3754,11 +3754,15 @@ static struct folio *do_read_cache_folio(struct address_space *mapping, if (!folio) return ERR_PTR(-ENOMEM); err = filemap_add_folio(mapping, folio, index, gfp); + printk("err: %d, folio: %p, in: %p, %s\n", err, folio, mapping->host, __func__); if (unlikely(err)) { folio_put(folio); if (err == -EEXIST) goto repeat; /* Presumably ENOMEM for xarray node */ + void *kaddr = kmap_local_folio(folio, 0); + memset(kaddr, 0, folio_size(folio)); + kunmap_local(kaddr); return ERR_PTR(err); } @@ -3791,6 +3795,7 @@ static struct folio *do_read_cache_folio(struct address_space *mapping, folio_put(folio); if (err == AOP_TRUNCATED_PAGE) goto repeat; + printk("err: %d, folio: %p, %s\n", err, folio, __func__); return ERR_PTR(err); } diff --git a/fs/namei.c b/fs/namei.c index 3a4c40e12f78..3f72aa8d604d 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -5272,6 +5272,8 @@ const char *page_get_link(struct dentry *dentry, struct inode *inode, page = read_mapping_page(mapping, 0, NULL); if (IS_ERR(page)) return (char*)page; + else if (IS_ERR(page_folio(page))) + return (char*)page_folio(page); } set_delayed_call(callback, page_put_link, page); BUG_ON(mapping_gfp_mask(mapping) & __GFP_HIGHMEM);