Date: Mon, 17 Feb 2014 16:56:14 +0100 From: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com> To: Karl Pielorz <kpielorz_lst@tdx.co.uk>, <freebsd-xen@freebsd.org> Subject: Re: FreeBSD 10-R 8 vCPU panics at boot under XenServer (on 8 'core' CPU) Message-ID: <5302311E.2040700@citrix.com> In-Reply-To: <6A3B878077F7D071847052C0@Mail-PC.tdx.co.uk> References: <6A3B878077F7D071847052C0@Mail-PC.tdx.co.uk>
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On 17/02/14 15:44, Karl Pielorz wrote: > > Hi, > > I've got a FreeBSD 10-R amd64 DomU guest I'm using under XenServer 6.2 > (SP1) - this was working fine (i.e. had been restarted many times - > while I look at things like HAST). > > I noticed the other day it was only set to use 4 vCPU's - so I increased > this to 8 (the machine has an 4 Core, 8 Thread Xeon 1230v3 in it - which > Xen see's as 8 CPU cores). > > However, it won't boot reliably now: > > " > ... > SMP: AP CPU #5 Launched > panic: can't schedule timer > cpuid = 0 > KDB: stack backtrace: > #0 0xffffffff808e7dd0 at kdb_backtrace+0x60 > #1 0xffffffff808af8b5 at panic+0x155 > #2 0xffffffff807a14dd at xentimer_et_start+0xed > #3 0xffffffff80d66d6d at loadtimer+0xfd > #4 0xffffffff80d657fd at handleevents+0x308 > #5 0xffffffff80d65fc8 at timercb+0x308 > #6 0xffffffff807a152d at xentimer_intr+0x4d > #7 0xffffffff80883e5b at intr_event_handle+0x9b > ... > " > > Less than 8 vCPU's seems to boot OK (e.g. 7) and 8 vCPU's has booted a > couple of times (out of 30+ reboots). I usually do most of my testing on a Xen W3550 (8-ways), with a 8 vCPU guest, and I've never seen this crash before. I've even booted a 12 vCPU guest on this 8-way system, and it was fine. How many guests are you running on this host, and how many vCPUs has each one assigned? > The system is running GENERIC with: > > options NO_ADAPTIVE_MUTEXES > options NO_ADAPTIVE_RWLOCKS > options NO_ADAPTIVE_SX > > In addition XenServer is set to pass through the bare machine's LSI and > two Intel NIC's (which it does - and are working, once FreeBSD is booted). I don't think those modifications have any effect on the timer, but could you try to recompile without the NO_ADAPTIE_* modifications and without any device pass-through? In order to provide more debug info, could you apply the following patch: http://xenbits.xen.org/people/royger/0001-xen-debug-Xen-PV-timer.patch It will expand the panic message a little bit. Also, after applying the patch you can manually edit sys/dev/xen/timer/timer.c and increase NUM_RETRIES to see if that solves the problem. Roger.
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