From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 94CAC1EEE6; Mon, 22 Jun 2026 22:39:02 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782167943; cv=none; b=ViWKorCH6DTjcvt0+qoi5B75IjCrQswL8RZ8SWbvB/M7OaYLu1+LveqmYxvJlGp2DOvqIEYdRh4ckcaZ45OL2XaKOcShUVsJTqcght+PrChPMUa15o21S8BiQqM8RNpigNYA1Ny1fDwysE2A9BB9dXHhkCbcFmkCg0dXjuKXqs0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1782167943; c=relaxed/simple; bh=0UZI4+F7lbrV7zDC6vqjBjpvU1XU8Re3m3+2rVfU10s=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=X5F1I3HQPLM4sUFpwrR32eBsFmX3bkkdHRiymWF7TAb15wo+Uyb5S1Kxv6HOFyKFfIZvbSdCi5KEJGH/P4Iy6w0tOhWLfY8C1O9HdNH/nTFm48KVavvTaK4jH2Le92fgMJi1C22ytfSSOY3HXfZclygMd1xWh0rIbRiccLTxqRU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=BhfPnS8v; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="BhfPnS8v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 543A31F000E9; Mon, 22 Jun 2026 22:39:01 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782167942; bh=Qnk4PjQT0BsFb4pmBS8gE+0k+h0pfH93Qp+RrCoNDpk=; h=Subject:From:To:Cc:Date:In-Reply-To:References; b=BhfPnS8vrcLErOAWLLJ9n8OyzAmuHv4tVnxjbtlfMjBAXSzUo2qBuxhYY+0EaSLd3 2QWCLxTYWKtBBEyfNgYxZUdmzPx5sUzrRHf7OQo7/r/XBUbXIP1OreUOpkUbyGnB9f EBnGfPqKhYhOyjJhp47VNqMyTPTHfZa/uNDs8nKVDaJ26L+kotT8Y0IMjJr6+RUVEV 7qvCzOnqy3C+64ZxyiijFDCWt5QqHVVSn5BaN0pcwMEIyv5AqOSrp4b2auZtvvTV6a FrSHiPTHV/OrZiDZ1DwwjLDPHuU3jExUc8N0MboGRfCfDs87XCR3YKPcDWVh2BuK5J HZ0zFY4k8lHhA== Message-ID: <655d0d2a5f8203c52c78d37462328449e49b7feb.camel@kernel.org> Subject: Re: [PATCH 1/4] nfs: store the full NFS fileid in inode->i_ino From: Jeff Layton To: Mark Brown Cc: Trond Myklebust , Anna Schumaker , Jonathan Corbet , Shuah Khan , linux-nfs@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org Date: Mon, 22 Jun 2026 18:38:59 -0400 In-Reply-To: <0750912a-f8dc-4714-ae11-4592d2e8eca7@sirena.org.uk> References: <20260512-nfsino-v1-0-284720522f4c@kernel.org> <20260512-nfsino-v1-1-284720522f4c@kernel.org> <0750912a-f8dc-4714-ae11-4592d2e8eca7@sirena.org.uk> Autocrypt: addr=jlayton@kernel.org; prefer-encrypt=mutual; keydata=mQINBE6V0TwBEADXhJg7s8wFDwBMEvn0qyhAnzFLTOCHooMZyx7XO7dAiIhDSi7G1NPxw n8jdFUQMCR/GlpozMFlSFiZXiObE7sef9rTtM68ukUyZM4pJ9l0KjQNgDJ6Fr342Htkjxu/kFV1Wv 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linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Mon, 2026-06-22 at 22:05 +0100, Mark Brown wrote: > On Tue, May 12, 2026 at 12:12:42PM -0400, Jeff Layton wrote: > > Now that inode->i_ino is a 64-bit value, store the full NFS fileid in > > it directly instead of an XOR-folded hash. This makes NFS_FILEID() and > > set_nfs_fileid() operate on inode->i_ino rather than the separate > > nfsi->fileid field. >=20 > This patch is in -next now and is triggering a failure for in the LTP > ioctl10.c test for me on arm: >=20 > tst_buffers.c:57: TINFO: Test is using guarded buffers > tst_test.c:2047: TINFO: LTP version: 20260130 > tst_test.c:2050: TINFO: Tested kernel: 7.1.0-next-20260622 #1 SMP @178212= 8788 armv7l >=20 > ... >=20 > ioctl10.c:111: TFAIL: q->inode (11493907226) !=3D entry.vm_inode (4294967= 295) >=20 Note that the vm_inode value is arm32's ULONG_MAX. > arm64 seems unaffected, I didn't really investigate but I'll note that > unsigned long is 32 bit on arm. >=20 > Full log: >=20 > https://lava.sirena.org.uk/scheduler/job/2904745#L3852 >=20 > bisect log with more test job links: >=20 The testcase does this: static void parse_maps_file(const char *filename, const char *keyword, stru= ct map_entry *entry) { FILE *fp =3D SAFE_FOPEN(filename, "r"); char line[1024]; while (fgets(line, sizeof(line), fp) !=3D NULL) { if (fnmatch(keyword, line, 0) =3D=3D 0) { if (sscanf(line, "%lx-%lx %s %lx %x:%x %lu %s", &entry->vm_start, &entry->v= m_end, entry->vm_flags_str, &entry->vm_pgoff, &entry->v= m_major, &entry->vm_minor, &entry->vm_inode, entry->vm= _name) < 7) tst_brk(TFAIL, "parse maps file /proc/self/= maps failed"); entry->vm_flags =3D parse_vm_flags(entry->vm_flags_= str); SAFE_FCLOSE(fp); return; } } SAFE_FCLOSE(fp); tst_brk(TFAIL, "parse maps file /proc/self/maps failed"); } Note that it's trying to stuff the inode number field into an unsigned long. Before this patch, the maps file would have printed the old (hashed) inode number on 32-bit. Now, it prints the full 64-bit inode number. I asked The Big Pickle and it says: "In glibc (userspace): The C standard says this is undefined behavior. In practice, glibc's scanf internally uses strtoul/strtoull, which on overflow store ULONG_MAX/ULLONG_MAX and set errno =3D ERANGE. However, scanf itself does not propagate ERANGE to the caller =E2=80=94 it still ret= urns 1 (success). So you'd silently get ULONG_MAX stored." We could argue that this is a bug in the testcase. It assumes that the maps file will never print a value larger than ULONG_MAX in that field, and I don't see why it would make that assumption in this day and age. Are there actual programs in the field that scrape the maps file that might be affected by this change? --=20 Jeff Layton