Re: [Xen-devel] printk from softirq on xen: hard lockup

Hi folks,

I have written an extremely simple reproducer. Xen 4.5.1. Linux 4.1.3.
Config attached. Reproducer attached. Makefile attached.

It results in the COMPLETE lockup of the system when it receives a
network packet over the Xen PV network interface.

The lockup is 100% reliable. As in the messages above, it puts this --
"while (native_apic_mem_read(APIC_ICR) & APIC_ICR_BUSY)" into a busy
loop that never exits.

It is triggered by a simple printk in softirq.

Thanks,
Jason