From: David Vrabel <david.vrabel@citrix.com>
To: "Jason A. Donenfeld" <Jason@zx2c4.com>,
<linux-kernel@vger.kernel.org>, <netdev@vger.kernel.org>,
<xen-devel@lists.xen.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Subject: Re: [Xen-devel] printk from softirq on xen: hard lockup
Date: Tue, 4 Aug 2015 18:12:49 +0100 [thread overview]
Message-ID: <55C0F291.7060806@citrix.com> (raw)
In-Reply-To: <CAHmME9rUdafnjz0ej-z_cgznMrj27SJgy6v8GJXM0qGfUpWaMQ@mail.gmail.com>
On 04/08/15 17:41, Jason A. Donenfeld wrote:
> Hi folks,
>
> Paul McKenney and I had an offline discussion about some rcu questions
> that eventually lead into me investigating a strange full lock-up I'm
> experiencing as a consequence of a printk in softirq inside of an
> rcu_read_lock, when using Xen PV. Relevant excerpts of the
^^ PV guest?
> (gdb) target remote localhost:9999
> Remote debugging using localhost:9999
> __xapic_wait_icr_idle () at ./arch/x86/include/asm/ipi.h:56
> 56 while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ => HVM guest
Which is it?
A HVM guest's serial console may be particularly slow (since it's
emulated by qemu). Try using the PV console?
David
next prev parent reply other threads:[~2015-08-04 17:12 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-04 16:41 printk from softirq on xen: hard lockup Jason A. Donenfeld
2015-08-04 17:12 ` David Vrabel [this message]
2015-08-04 17:45 ` Jason A. Donenfeld
2015-08-04 23:01 ` [Xen-devel] " Jason A. Donenfeld
2015-08-06 10:02 ` David Vrabel
2015-08-06 15:58 ` Jason A. Donenfeld
2015-08-06 16:10 ` David Vrabel
2015-08-06 16:21 ` Jason A. Donenfeld
2015-08-06 16:29 ` [PATCH] xen-apic: Enable on domU as well Jason A. Donenfeld
2015-08-06 16:37 ` [PATCH v2] " Jason A. Donenfeld
2015-08-07 14:23 ` [Xen-devel] " Konrad Rzeszutek Wilk
2015-08-07 14:37 ` Jason A. Donenfeld
2015-08-10 13:40 ` [PATCH v3] " Jason A. Donenfeld
2015-08-10 13:41 ` David Vrabel
2015-08-10 13:44 ` Jason A. Donenfeld
2015-08-11 10:46 ` [Xen-devel] " David Vrabel
2015-08-05 16:37 ` [Xen-devel] printk from softirq on xen: hard lockup Jason A. Donenfeld
2015-08-06 8:22 ` Ian Campbell
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