Date: Mon, 26 Nov 2018 13:34:15 -0500 From: Joe Clarke <jclarke@marcuscom.com> To: John Baldwin <jhb@FreeBSD.org>, stable@freebsd.org Cc: =?UTF-8?Q?Roger_Pau_Monn=c3=a9?= <royger@FreeBSD.org> Subject: Re: Panic on 11-STABLE with Xen guest Message-ID: <33a9ab44-3abf-d669-c462-36b673070cd9@marcuscom.com> In-Reply-To: <87ec7a7b-f64e-21b7-ac2c-790e2ff70247@FreeBSD.org> References: <00d6d9ae-d5d8-ed88-34ee-2e67c0ca8904@marcuscom.com> <87ec7a7b-f64e-21b7-ac2c-790e2ff70247@FreeBSD.org>
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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@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@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 > -- PGP Key : http://www.marcuscom.com/pgp.asc
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