[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Xen-devel] printk from softirq on xen: hard lockup
PV guest domU. PV host dom0.
On Aug 4, 2015 7:14 PM, "David Vrabel" < david.vrabel@xxxxxxxxxx> wrote: 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
> 56Â Â Â Â Â Â Â while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)
            Â^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ => 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
_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel
|
