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Re: [Xen-devel] [PATCH 00/60] xen: add core scheduling support


  • To: Juergen Gross <jgross@xxxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
  • From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
  • Date: Thu, 25 Jul 2019 17:01:52 +0100
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  • Cc: "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Tim Deegan <tim@xxxxxxx>, Robert VanVossen <robert.vanvossen@xxxxxxxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, Josh Whitehead <josh.whitehead@xxxxxxxxxxxxxxx>, Meng Xu <mengxu@xxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Ian Jackson <ian.jackson@xxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
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  • List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
  • Openpgp: preference=signencrypt

Hi Juergen,

I've found another regression that happens only with sched-gran=core.
CentOS 5.11 (PV, CPUs: 32; RAM: 6GB) kernel hangs during suspend attempt.
The last kernel messages are:

    CPU 1 offline: Remove Rx thread
    CPU 2 offline: Remove Rx thread

Kernel: Linux localhost 2.6.18-398.el5xen #1 SMP Tue Sep 16 21:31:50 EDT 2014 
x86_64 x86_64 x86_64 GNU/Linux

xl top shows 100% CPU utilization for the hanged VM. And here's its state:

(XEN) [ 1907.976356] *** Dumping CPU14 guest state (d1v0): ***

(XEN) [ 1907.982558] ----[ Xen-4.13.0-8.0.6-d  x86_64  debug=y   Not tainted 
]----

(XEN) [ 1907.990704] CPU:    14

(XEN) [ 1907.993901] RIP:    e033:[<ffffffff80264a7b>]

(XEN) [ 1907.999333] RFLAGS: 0000000000000286   EM: 1   CONTEXT: pv guest (d1v0)

(XEN) [ 1908.007282] rax: 0000000000000001   rbx: ffffffff80522b80   rcx: 
0000000000000000

(XEN) [ 1908.016203] rdx: ffffffff80522b90   rsi: 0000000000000079   rdi: 
ffffffff8052a980

(XEN) [ 1908.025121] rbp: ffffffff80522980   rsp: ffff88017106dcf8   r8:  
ffff88017106c000

(XEN) [ 1908.034040] r9:  0000000000000000   r10: 0000000000000000   r11: 
ffff880176fad8c0

(XEN) [ 1908.042962] r12: 0000000000000001   r13: 0000000000000000   r14: 
ffffffff80522980

(XEN) [ 1908.051881] r15: 0000000000000003   cr0: 000000008005003b   cr4: 
0000000000142660

(XEN) [ 1908.060800] cr3: 000000801d8c0000   cr2: 00002b5400970000

(XEN) [ 1908.067393] fsb: 0000000000000000   gsb: ffffffff80639000   gss: 
0000000000000000

(XEN) [ 1908.076311] ds: 0000   es: 0000   fs: 0000   gs: 0000   ss: e02b   cs: 
e033

(XEN) [ 1908.084650] Guest stack trace from rsp=ffff88017106dcf8:

(XEN) [ 1908.091147]    ffffffff802c3dd4 0000000001168460 ffffffff80522b90 
0000000000000079

(XEN) [ 1908.100164]    ffffffff80522b80 ffffffff80522980 0000000000000001 
0000000000000000

(XEN) [ 1908.109179]    0000000000000003 0000000000000003 ffffffff802c4041 
ffff88017d68b040

(XEN) [ 1908.118197]    0000000000000003 0000000000000003 0000000000000007 
0000000000000003

(XEN) [ 1908.127213]    00000000ffffffea ffffffff8029f0ad ffffffff802c4092 
ffffffff8050ff90

(XEN) [ 1908.136229]    ffffffff80268111 0000000000000003 0000000000000000 
ffff88017d68b040

(XEN) [ 1908.145245]    ffffffff802a408b 0000000000000000 ffff8800011d3860 
fffffffffffffff7

(XEN) [ 1908.154263]    ffffffffffffffff ffffffffffffffff 7fffffffffffffff 
0000000000000001

(XEN) [ 1908.163278]    0000000000000000 0000000000000000 0000000000000000 
0000000000000000

(XEN) [ 1908.172296]    0000000000000003 0000000000000003 0000000000000000 
ffff88017f5ebce0

(XEN) [ 1908.181312]    0000000000000000 ffff88017f5ebcd0 ffffffff803be1a6 
0000000000000001

(XEN) [ 1908.190328]    0000000000000000 ffffffff803be9dd ffffffff803bea43 
ffff88017106deb0

(XEN) [ 1908.199345]    ffffffff80289495 0000000300000000 ffff88017f5ebce0 
ffff88017f5ebce8

(XEN) [ 1908.208362]    0000000000000000 ffff88017f5ebcd0 ffffffff8029f0ad 
ffff88017106dee0

(XEN) [ 1908.217379]    0000000000000000 ffff88017f5ebce0 0000000000000000 
ffff88017f5ebcd0

(XEN) [ 1908.226396]    ffffffff8029f0ad 0000000000000000 ffffffff80233ee4 
0000000000000000

(XEN) [ 1908.235413]    ffff88017d8687f0 ffffffffffffffff ffffffffffffffff 
ffffffffffffffff

(XEN) [ 1908.244427]    7fffffffffffffff ffffffffffffffff ffff8800011d3860 
ffff88017f5ebcd0

(XEN) [ 1908.253444]    ffff88017f5ebc78 ffff88017f5ce6c0 ffffffff80260b2c 
0000000000000000

(XEN) [ 1908.262461]    ffffffff8029f0ad ffff88017f5ebcd0 0000000000000000 
ffff88017f5ce6c0



Thanks,
Sergey

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