On 2018-06-23 01:46 +0800, Xi Ruoyao wrote:
> preadvwritev tests fail because of buggy kernel of host system (the test file
> has a comment about this issue).
> I've seen and investigated them. Don't worry.
In glibc-2.27/misc/tst-preadvwritev2-common.c:
> /* This might fail for compat syscall (32 bits running on 64 bits kernel)
> due a kernel issue. */
> if (pwritev2 (temp_fd, &vec, 1, 0, invalid_flag) != -1)
> FAIL_EXIT1 ("pwritev2 did not fail with an invalid flag");
> if (errno != ENOTSUP)
> FAIL_EXIT1 ("pwritev2 failure did not set errno to ENOTSUP (%d)", errno);
I think this kernel issue was introduced by
4babf2c5efb79be778d45ebe95d9c9b3c880c83b "x86: wire up preadv2 and pwritev2"
And fixed by
3ebfd81f7fb3e81a754e37283b7f38c62244641a
"x86/syscalls: Add compat_sys_preadv64v2/compat_sys_pwritev64v2"
Attached a patch adding a note about this issue in book.
--
Xi Ruoyao <[email protected]>
School of Aerospace Science and Technology, Xidian UniversityFrom 186f50bc90c102f1442e6a1beb35ee958405bfb2 Mon Sep 17 00:00:00 2001
From: Xi Ruoyao <[email protected]>
Date: Sat, 23 Jun 2018 20:12:29 +0800
Subject: [PATCH] Note glibc test failures caused by host kernel
---
chapter06/glibc.xml | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/chapter06/glibc.xml b/chapter06/glibc.xml
index c83b80a6..68a66f34 100644
--- a/chapter06/glibc.xml
+++ b/chapter06/glibc.xml
@@ -194,6 +194,13 @@ unset GCC_INCDIR</userinput></screen>
malloc/tst-malloc-usable and nptl/tst-cleanupx4. </para>
</listitem>
-->
+
+ <listitem>
+ <para>The <emphasis>misc/tst-preadvwritev2</emphasis> and
+ <emphasis>misc/tst-preadvwritev64v2</emphasis> tests may fail if
+ building 32-bit LFS on 64-bit host with certain kernel versions.
+ </para>
+ </listitem>
</itemizedlist>
<para>Though it is a harmless message, the install stage of Glibc will
--
2.16.2
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