Author: ken
Date: Wed Jan 23 03:05:19 2019
New Revision: 21021
Log:
Rust: I was mistaken about the Ryzen problem with the testsuite, traps and a
few segfaults are normal but nobody usually looks at the syslog.
Modified:
trunk/BOOK/general/prog/rust.xml
trunk/BOOK/introduction/welcome/changelog.xml
Modified: trunk/BOOK/general/prog/rust.xml
==============================================================================
--- trunk/BOOK/general/prog/rust.xml Wed Jan 23 01:11:41 2019 (r21020)
+++ trunk/BOOK/general/prog/rust.xml Wed Jan 23 03:05:19 2019 (r21021)
@@ -201,25 +201,17 @@
by a message that the build completed successfully.
</para>
- <caution>
+ <note>
<para>
- On AMD Ryzen processors (family 17h), the non-optimized version of
libstd
- which is compiled at the start of the tests contains one or more
opcodes
- which are not implemented on this CPU family. These will be logged in
the
+ The testsuite will generate some messages in the
<phrase revision="sysv">system log</phrase>
<phrase revision="systemd">systemd journal</phrase>
- and will be followed a few minutes later by segmentation faults.
Despite
- that, the tests continue to run, apparently normally. But the system
may
- reboot before the tests have completed. The normal optimized libraries
- run without this problem.
+ for traps on invalid opcodes, and for segmentation faults.
+ In themselves these are nothing to worry about, although if the
+ output from the testsuite reports tests which FAIL with such faults
+ then there may be a problem.
</para>
- <para>
- A mitigation is to install gdb
- <!-- systemd apparently handles this with systemd-coredump -->
- <phrase revision="sysv">and to run the tests with 'ulimit -C
disabled'</phrase>
- but this does not always prevent the system rebooting.
- </para>
- </caution>
+ </note>
<para>
To run the tests issue
Modified: trunk/BOOK/introduction/welcome/changelog.xml
==============================================================================
--- trunk/BOOK/introduction/welcome/changelog.xml Wed Jan 23 01:11:41
2019 (r21020)
+++ trunk/BOOK/introduction/welcome/changelog.xml Wed Jan 23 03:05:19
2019 (r21021)
@@ -45,6 +45,15 @@
<para>January 23rd, 2018</para>
<itemizedlist>
<listitem>
+ <para>[ken] - Change the 'Caution' on the rustc page (about running
+ the testsuite on AMD Ryzens) to a 'Note', the reboot problem was
+ almost certainly kernel triple-faults on an -rc kernel, although
+ the testsuite seemed to reliably trigger it at that time. The
+ supposed mitigation (now removed) was clearly irrelevant, and to
+ top it all the invalid opcodes also appear on other machines, so
+ they too are probably deliberate.</para>
+ </listitem>
+ <listitem>
<para>[pierre] - Update dependencies for libtasn1 and GTK+3:
the dependency on python-six is obsolete.</para>
</listitem>
--
http://lists.linuxfromscratch.org/listinfo/blfs-book
FAQ: http://www.linuxfromscratch.org/blfs/faq.html
Unsubscribe: See the above information page
