From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sheng Yang <sheng@yasker.org>
Subject: Debian stable kernel got timer issue when running as PV
	guest
Date: Thu, 12 Apr 2012 12:22:30 -0700
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(Sorry for duplicate mail, got a typo in the mailing list address...)

Hi,

Recently we got some reports of Debian(2.6.32-41 package) migration hang on
some certain machines. I've identified one issue in Xen, but I think there
is probably another issue in the kernel.

Here is the case.

[    0.000000] Booting paravirtualized kernel on Xen



[    0.000000] Xen version: 3.4.2 (preserve-AD)



[    0.000000] NR_CPUS:32 nr_cpumask_bits:32 nr_cpu_ids:1 nr_node_ids:1



[    0.000000] PERCPU: Embedded 15 pages/cpu @c1608000 s37656 r0 d23784
u65536


[    0.000000] pcpu-alloc: s37656 r0 d23784 u65536 alloc=16*4096



[    0.000000] pcpu-alloc: [0] 0



[508119.807590] trying to map vcpu_info 0 at c1609010, mfn 992cac, offset
16


[508119.807593] cpu 0 using vcpu_info at c1609010



[508119.807594] Xen: using vcpu_info placement



[508119.807598] Built 1 zonelists in Zone order, mobility grouping on.
 Total pages: 32416

Dmesg show that when booting, timestamp of printk jumped from 0 to a big
number([508119.807590] in this case) immediately.

And when migrating:

[509508.914333] suspending xenstore...



[516212.055921] trying to map vcpu_info 0 at c1609010, mfn 895fd7, offset
16


[516212.055930] cpu 0 using vcpu_info at c1609010

Timestamp jumped again. We can reproduce above issues on our Sandy Bridge
machines.

After this, call trace and guest hang maybe observed on some machines:

[516383.019499] INFO: task xenwatch:12 blocked for more than 120 seconds.



[516383.019566] "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables
this message.


[516383.019578] xenwatch      D c1610e20     0    12      2 0x00000000



[516383.019591]  c781eec0 00000246 c1610e58 c1610e20 c781f300 c1441e20
c1441e20 001cf000


[516383.019605]  c781f07c c1610e20 00000000 00000001 c1441e20 c62e01c0
c1610e20 c62e01c0


[516383.019617]  c127e18e c781f07c c7830020 c7830020 c1441e20 c1441e20
c127f2f1 c781f080


[516383.019629] Call Trace:



[516383.019640]  [<c127e18e>] ? schedule+0x78f/0x7dc



[516383.019645]  [<c127f2f1>] ? _spin_unlock_irqrestore+0xd/0xf



[516383.019649]  [<c127e4a1>] ? schedule_timeout+0x20/0xb0



[516383.019656]  [<c100573c>] ? xen_force_evtchn_callback+0xc/0x10



[516383.019660]  [<c127e3aa>] ? wait_for_common+0xa4/0x100



[516383.019665]  [<c1033315>] ? default_wake_function+0x0/0x8



[516383.019671]  [<c104a144>] ? kthread_stop+0x4f/0x8e



[516383.019675]  [<c1047883>] ? cleanup_workqueue_thread+0x3a/0x45



[516383.019679]  [<c1047903>] ? destroy_workqueue+0x56/0x85



[516383.019684]  [<c106a395>] ? stop_machine_destroy+0x23/0x37



[516383.019690]  [<c11962d8>] ? shutdown_handler+0x200/0x22f



[516383.019694]  [<c1197439>] ? xenwatch_thread+0xdc/0x103



[516383.019698]  [<c104a322>] ? autoremove_wake_function+0x0/0x2d



[516383.019701]  [<c119735d>] ? xenwatch_thread+0x0/0x103



[516383.019705]  [<c104a0f0>] ? kthread+0x61/0x66



[516383.019709]  [<c104a08f>] ? kthread+0x0/0x66



[516383.019714]  [<c1008d87>] ? kernel_thread_helper+0x7/0x10

But I cannot reproduce it call trace and hang on our Sandy Bridge.

I've spent some time to identify the timestamp jump issue, and
finally found it's due to Invarient TSC (CPUID Leaf 0x80000007 EDX:8, also
called non-stop TSC). The present of the feature would enable a parameter
in the kernel named: sched_clock_stable. Seems this parameter is unable to
work with Xen's pvclock. If sched_clock_stable() is set, value returned by
xen_clocksource_read() would be returned as sched_clock_cpu() directly, but
CMIIW the value returned by xen_clocksource_read() is based on host(vcpu)
uptime rather than this VM's uptime, then result in the timestamp jump.

I've compiled a kernel, force sched_clock_stable=0, then it solved the
timestamp jump issue as expected. Luckily, seems it also solved the call
trace and guest hang issue as well.

Attachment is a (untested) patch to mask the CPUID leaf 0x80000007. I think
the issue can be easily reproduced using a Westmere or SandyBridge
machine(my old colleagues at Intel said the feature likely existed after
Nehalem) running newer version of PV guest, check the guest cpuinfo you
would see nonstop_tsc, and you would notice the abnormal timestamp of
printk.

Sorry I don't have a Xen unstable environment by hand now. But I think this
should be the case we saw.

BTW: the original environment is xen-3.4.2, but I found the feature remain
unmasked by latest xen-unstable tree.

--
regards
Yang, Sheng




-- 
--
regards
Yang, Sheng

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