From: Keir Fraser <keir.xen@gmail.com>
To: Julian Pidancet <julian.pidancet@gmail.com>,
xen-devel@lists.xensource.com
Subject: Re: Xen randomly stuck in mdelay() during MP initialization
Date: Wed, 11 Jan 2012 13:28:40 +0000 [thread overview]
Message-ID: <CB333F08.28854%keir.xen@gmail.com> (raw)
In-Reply-To: <CAKZ=5EUEYzopp7yOTm839ZVW3QVxRwQJDmoNr3Xc_DoBjpZP2w@mail.gmail.com>
On 11/01/2012 13:06, "Julian Pidancet" <julian.pidancet@gmail.com> wrote:
> Hi,
>
> When trying to boot xen 4.1 on new hardware, Xen become stuck in
> wakeup_secondary_cpu() in the mdelay function.
>
> Dprintk("Waiting for send to finish...\n");
> timeout = 0;
> do {
> Dprintk("+");
> udelay(100);
> if ( !x2apic_enabled )
> send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
> } while ( send_status && (timeout++ < 1000) );
>
> printk("before mdelay\n");
> mdelay(10);
> printk("after mdelay\n");
>
> Dprintk("Deasserting INIT.\n");
>
> The hang can happen randomly with any of the CPUs to wake up and
> sometime doesn't happen at all.
> Replacing mdelay(10) with udelay(10) seems to fix the issue.
Do you see this in xen-unstable? Hopefully it is working there, and we can
simply backport the fix.
-- Keir
next prev parent reply other threads:[~2012-01-11 13:28 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-11 13:06 Xen randomly stuck in mdelay() during MP initialization Julian Pidancet
2012-01-11 13:27 ` Pasi Kärkkäinen
2012-01-11 13:28 ` Keir Fraser [this message]
2012-01-11 14:51 ` Julian Pidancet
2012-01-11 15:12 ` Jan Beulich
2012-01-11 15:28 ` Julian Pidancet
2012-01-11 15:35 ` Jan Beulich
2012-01-11 15:27 ` Keir Fraser
2012-01-11 14:53 ` Igor Mammedov
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