Panic on 11-STABLE with Xen guest

[Joe Clarke]

On 11/26/18 13:31, John Baldwin wrote:
> On 11/22/18 12:39 PM, Joe Clarke wrote:
>> I believe after the commit 340016 for the dynamic IRQ layout, my Xen VM
>> started to panic.  I just upgraded the kernel today and saw this:
>>
>> xen: unable to map IRQ#2
>> panic: Unable to register interrupt override
>> cpuid = 0
>> KDB: stack backtrace:
>> #0 0xffffffff8060a4e7 at kdb_backtrace+0x67
>> #1 0xffffffff805c3787 at vpanic+0x177
>> #2 0xffffffff805c3603 at panic+0x43
>> #3 0xffffffff8093a766 at madt_parse_ints+0x96
>> #4 0xffffffff803353f9 at acpi_walk_subtables+0x29
>> #5 0xffffffff8093a5e6 at xenpv_register_pirqs+0x56
>> #6 0xffffffff80928296 at intr_init_sources+0x116
>> #7 0xffffffff8055eba8 at mi_startup+0x118
>> #8 0xffffffff8029902c at btext+0x2c
>>
>> The following kernel works:
>>
>> @(#)FreeBSD 11.2-STABLE #4: Thu Nov  1 02:24:07 EDT 2018
>> FreeBSD 11.2-STABLE #4: Thu Nov  1 02:24:07 EDT 2018
>>     root at creme-brulee:/usr/obj/usr/src/sys/CREME-BRULEE
>>
>> The following kernel produces the panic above immediately on boot:
>>
>> @(#)FreeBSD 11.2-STABLE #5: Wed Nov 21 11:08:38 EST 2018
>> FreeBSD 11.2-STABLE #5: Wed Nov 21 11:08:38 EST 2018
>>     root at creme-brulee:/usr/obj/usr/src/sys/CREME-BRULEE
>>
>> Attached is a screen grab of the console of the panic.
> 
> Hmm, I don't see any obvious candidates of Xen changes that weren't included
> in the MFC.  I've added royger@ (who maintains Xen in FreeBSD) to the cc to
> see if he has an idea.
> 
> Roger, the main changes that aren't MFC'd to 11 from 12/head seem to be some
> refcounting on event channels and PVHv2 vs PVHv1?

Thanks for the follow-up, John.  Apparently, there was an incomplete
MFC.  Roger added the missing bit today in r340982 which resolved the panic.

Joe

Joe

> 


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