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Bug#733043: marked as done (linux-2.6: warm reboot on XeonE5 machine finally hang up (after 208.5 days))

Your message dated Sun, 07 Feb 2016 22:43:10 +0000
with message-id <E1aSY2w-0006LQ-7t@deadeye>
and subject line Closing bugs assigned to linux-2.6 package
has caused the Debian Bug report #733043,
regarding linux-2.6: warm reboot on XeonE5 machine finally hang up (after 208.5 days)
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

(NB: If you are a system administrator and have no idea what this
message is talking about, this may indicate a serious mail system
misconfiguration somewhere. Please contact owner@bugs.debian.org
immediately.)


-- 
733043: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=733043
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: linux-2.6
Version: 2.6.32-48squeeze4
Severity: important
Tags: fixed-upstream, patch

 Xeon E5 has a bug, it doesn't reset TSC on warm reboot, just keep it instead.
 see "BT81. X X X No Fix TSC is Not Affected by Warm Reset"
 http://www.intel.com/content/dam/www/public/us/en/documents/specification-updates/xeon-e5-family-spec-update.pdf

 And also kernel 2.6.32 has a bug.
 Xeon bug + kernel bug = hung after warm reboot (or kexec) after 208.5 days
 since booting. So, administrators should shutdown it once at all, then
 boot it again because "shutdown -r" causes hang up. 

 Red Hat has released a fix for this as kernel 2.6.32-220, 2.6.32-279
 and 2.6.32-358 series (RHEL6.x)
 https://access.redhat.com/site/solutions/433883 (for detail subscriber only :-(

 Attached patch is based on upstream patch.
 see http://kernel.opensuse.org/cgit/kernel/patch/?id=9993bc635d01a6ee7f6b833b4ee65ce7c06350b1

 Please look into it and update.
 Thanks.


-- 
Regards,

 Hideki Yamane     henrich @ debian.or.jp/org
 http://wiki.debian.org/HidekiYamane

diff -urN linux-2.6-2.6.32.orig/debian/changelog linux-2.6-2.6.32/debian/changelog
--- linux-2.6-2.6.32.orig/debian/changelog	2013-12-24 22:24:17.000000000 +0900
+++ linux-2.6-2.6.32/debian/changelog	2013-12-24 22:32:19.833691711 +0900
@@ -1,3 +1,12 @@
+linux-2.6 (2.6.32-48squeeze4.1) UNRELEASED; urgency=medium
+
+  [ Hideki Yamane ]
+  * Non-maintainer upload.
+  * "sched/x86: Fix overflow in cyc2ns_offset" from upstream git.
+    It avoids hung up after reboot on Xeon E5 that spends 208.5 days
+
+ -- Hideki Yamane <henrich@debian.org>  Tue, 24 Dec 2013 22:09:52 +0900
+
 linux-2.6 (2.6.32-48squeeze4) squeeze-security; urgency=high
 
   [ Ian Campbell ]
diff -urN linux-2.6-2.6.32.orig/debian/patches/bugfix/x86/sched_x86_Fix_overflow_in_cyc2ns_offset.patch linux-2.6-2.6.32/debian/patches/bugfix/x86/sched_x86_Fix_overflow_in_cyc2ns_offset.patch
--- linux-2.6-2.6.32.orig/debian/patches/bugfix/x86/sched_x86_Fix_overflow_in_cyc2ns_offset.patch	1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6-2.6.32/debian/patches/bugfix/x86/sched_x86_Fix_overflow_in_cyc2ns_offset.patch	2013-12-24 22:29:56.117656579 +0900
@@ -0,0 +1,51 @@
+commit 9993bc635d01a6ee7f6b833b4ee65ce7c06350b upstream.
+
+diff -urN linux-2.6-2.6.32/arch/x86/include/asm/timer.h linux-2.6-2.6.32.fixed/arch/x86/include/asm/timer.h
+--- linux-2.6-2.6.32/arch/x86/include/asm/timer.h	2009-12-03 12:51:21.000000000 +0900
++++ linux-2.6-2.6.32.fixed/arch/x86/include/asm/timer.h	2013-12-24 22:09:10.930488157 +0900
+@@ -49,7 +49,8 @@
+ {
+ 	int cpu = smp_processor_id();
+ 	unsigned long long ns = per_cpu(cyc2ns_offset, cpu);
+-	ns += cyc * per_cpu(cyc2ns, cpu) >> CYC2NS_SCALE_FACTOR;
++	ns += mult_frac(cyc, per_cpu(cyc2ns, cpu),
++			(1UL << CYC2NS_SCALE_FACTOR));
+ 	return ns;
+ }
+ 
+diff -urN linux-2.6-2.6.32/arch/x86/kernel/tsc.c linux-2.6-2.6.32.fixed/arch/x86/kernel/tsc.c
+--- linux-2.6-2.6.32/arch/x86/kernel/tsc.c	2009-12-03 12:51:21.000000000 +0900
++++ linux-2.6-2.6.32.fixed/arch/x86/kernel/tsc.c	2013-12-24 22:04:41.441744936 +0900
+@@ -619,7 +619,8 @@
+ 
+ 	if (cpu_khz) {
+ 		*scale = (NSEC_PER_MSEC << CYC2NS_SCALE_FACTOR)/cpu_khz;
+-		*offset = ns_now - (tsc_now * *scale >> CYC2NS_SCALE_FACTOR);
++		*offset = ns_now - mult_frac(tsc_now, *scale,
++					     (1UL << CYC2NS_SCALE_FACTOR));
+ 	}
+ 
+ 	sched_clock_idle_wakeup_event(0);
+diff -urN linux-2.6-2.6.32/include/linux/kernel.h linux-2.6-2.6.32.fixed/include/linux/kernel.h
+--- linux-2.6-2.6.32/include/linux/kernel.h	2009-12-03 12:51:21.000000000 +0900
++++ linux-2.6-2.6.32.fixed/include/linux/kernel.h	2013-12-24 22:04:41.441744936 +0900
+@@ -55,6 +55,19 @@
+ }							\
+ )
+ 
++/*
++ * Multiplies an integer by a fraction, while avoiding unnecessary
++ * overflow or loss of precision.
++ */
++#define mult_frac(x, numer, denom)(			\
++{							\
++	typeof(x) quot = (x) / (denom);			\
++	typeof(x) rem  = (x) % (denom);			\
++	(quot * (numer)) + ((rem * (numer)) / (denom));	\
++}							\
++)
++
++
+ #define _RET_IP_		(unsigned long)__builtin_return_address(0)
+ #define _THIS_IP_  ({ __label__ __here; __here: (unsigned long)&&__here; })
+ 
diff -urN linux-2.6-2.6.32.orig/debian/patches/series/48squeeze4.1 linux-2.6-2.6.32/debian/patches/series/48squeeze4.1
--- linux-2.6-2.6.32.orig/debian/patches/series/48squeeze4.1	1970-01-01 09:00:00.000000000 +0900
+++ linux-2.6-2.6.32/debian/patches/series/48squeeze4.1	2013-12-24 22:31:43.449682015 +0900
@@ -0,0 +1 @@
++ bugfix/x86/sched_x86_Fix_overflow_in_cyc2ns_offset.patch

--- End Message ---
--- Begin Message --- 
Version: 3.4.1-1~experimental.1+rm

Debian 6.0 Long Term Support has now ended, and the 'linux-2.6' source
package will no longer be updated.  This bug is being closed on the
assumption that it does not affect the kernel versions in newer Debian
releases.

If you can still reproduce this bug in a newer release, please reopen
the bug report and reassign it to 'src:linux' and the affected version
of the package.  You can find the package version for the running
kernel by running:

    uname -v

or the versions of all installed kernel packages by running:

    dpkg -l 'linux-image-[34]*' | grep ^.i

and looking at the third column.

I apologise that we weren't able to provide a specific resolution for
this bug.

Ben.

-- 
Ben Hutchings - Debian developer, member of Linux kernel and LTS teams

--- End Message ---
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