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[Xen-devel] Live-Patch application failure in core-scheduling mode
- To: Xen-devel <xen-devel@xxxxxxxxxxxxx>
- From: Sergey Dyasli <sergey.dyasli@xxxxxxxxxx>
- Date: Wed, 5 Feb 2020 16:03:41 +0000
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- Cc: Juergen Gross <jgross@xxxxxxxx>, "sergey.dyasli@xxxxxxxxxx >> Sergey Dyasli" <sergey.dyasli@xxxxxxxxxx>, George Dunlap <George.Dunlap@xxxxxxxxxx>, Dario Faggioli <dfaggioli@xxxxxxxx>, Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>, Jan Beulich <JBeulich@xxxxxxxx>
- Delivery-date: Wed, 05 Feb 2020 16:03:54 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hello,
I'm currently investigating a Live-Patch application failure in core-
scheduling mode and this is an example of what I usually get:
(it's easily reproducible)
(XEN) [ 342.528305] livepatch: lp: CPU8 - IPIing the other 15 CPUs
(XEN) [ 342.558340] livepatch: lp: Timed out on semaphore in CPU quiesce
phase 13/15
(XEN) [ 342.558343] bad cpus: 6 9
(XEN) [ 342.559293] CPU: 6
(XEN) [ 342.559562] Xen call trace:
(XEN) [ 342.559565] [<ffff82d08023f304>] R
common/schedule.c#sched_wait_rendezvous_in+0xa4/0x270
(XEN) [ 342.559568] [<ffff82d08023f8aa>] F
common/schedule.c#schedule+0x17a/0x260
(XEN) [ 342.559571] [<ffff82d080240d5a>] F
common/softirq.c#__do_softirq+0x5a/0x90
(XEN) [ 342.559574] [<ffff82d080278ec5>] F
arch/x86/domain.c#guest_idle_loop+0x35/0x60
(XEN) [ 342.559761] CPU: 9
(XEN) [ 342.560026] Xen call trace:
(XEN) [ 342.560029] [<ffff82d080241661>] R _spin_lock_irq+0x11/0x40
(XEN) [ 342.560032] [<ffff82d08023f323>] F
common/schedule.c#sched_wait_rendezvous_in+0xc3/0x270
(XEN) [ 342.560036] [<ffff82d08023f8aa>] F
common/schedule.c#schedule+0x17a/0x260
(XEN) [ 342.560039] [<ffff82d080240d5a>] F
common/softirq.c#__do_softirq+0x5a/0x90
(XEN) [ 342.560042] [<ffff82d080279db5>] F
arch/x86/domain.c#idle_loop+0x55/0xb0
The first HT sibling is waiting for the second in the LP-application
context while the second waits for the first in the scheduler context.
Any suggestions on how to improve this situation are welcome.
--
Thanks,
Sergey
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