Re: [Xen-devel] Fwd: xenbusb_nop_confighook_cb timeout and cd issue

[Steven Chamberlain <steven@xxxxxxxxxxx>]

Hi,

A little more background to this:

An error was first seen on Debian's i386 autobuilders when building Xen
4.1.2 (Debian package 4.1.2-7), but only after a switch from gcc-4.6 to
gcc-4.7 which seems to be what prompted this.  I'm not sure if it would
have affected amd64 builds as we don't have logs for those:

https://buildd.debian.org/status/fetch.php?pkg=xen&arch=i386&ver=4.1.3-7&stamp=1355254810
:
> gcc -O2 -fomit-frame-pointer -m32 -march=i686 -fno-strict-aliasing -std=gnu99 
> -Wall -Wstrict-prototypes -Wno-unused-value -Wdeclaration-after-statement 
> -Wno-unused-but-set-variable  -DNDEBUG -nostdinc -fno-builtin -fno-common 
> -Wredundant-decls -iwithprefix include -Werror -Wno-pointer-arith -pipe 
> -I/build/buildd-xen_4.1.3~rc1+hg-20120614.a9c0a89c08f2-1-i386-iqa4wM/xen-4.1.3~rc1+hg-20120614.a9c0a89c08f2/debian/build/build-hypervisor_i386_i386/xen/include
>   
> -I/build/buildd-xen_4.1.3~rc1+hg-20120614.a9c0a89c08f2-1-i386-iqa4wM/xen-4.1.3~rc1+hg-20120614.a9c0a89c08f2/debian/build/build-hypervisor_i386_i386/xen/include/asm-x86/mach-generic
>  
> -I/build/buildd-xen_4.1.3~rc1+hg-20120614.a9c0a89c08f2-1-i386-iqa4wM/xen-4.1.3~rc1+hg-20120614.a9c0a89c08f2/debian/build/build-hypervisor_i386_i386/xen/include/asm-x86/mach-default
>  -msoft-float -fno-stack-protector -fno-exceptions -g -D__XEN__ -MMD -MF 
> .i8259.o.d -c i8259.c -o i8259.o
> i8259.c:66:9: error: initialization from incompatible pointer type [-Werror]
> i8259.c:66:9: error: (near initialization for 'interrupt[0]') [-Werror]
> i8259.c:66:9: error: initialization from incompatible pointer type [-Werror]
> i8259.c:66:9: error: (near initialization for 'interrupt[1]') [-Werror]
> i8259.c:66:9: error: initialization from incompatible pointer type [-Werror]
> i8259.c:66:9: error: (near initialization for 'interrupt[2]') [-Werror]

In order to fix the build issue, this patch was written, and is still
used when building Debian's Xen 4.1.3 packages:
http://patch-tracker.debian.org/patch/series/view/xen/4.1.3-7/xen-x86-interrupt-pointer-missmatch.diff

Since October 2012 many FreeBSD (9.x) users reported an issue booting on
Xenserver 6.1 / XCP 1.6 (incl. -BETA) but not affecting XCP 1.5:
http://lists.freebsd.org/pipermail/freebsd-xen/2012-October/001374.html

There were prior reports of identical symptoms triggered by guest CD-ROM
drives without media, but this seems to be an unrelated bug.

Egoitz, who has done a lot of work porting FreeBSD to XCP recently,
found that Debian's (Wheezy) Xen kernel didn't have this bug;  realised
that the above patch fixes it.

I experienced the bug when booting the FreeBSD 9.0 kernel on a NetBSD
6.0.1 dom0 after upgrading to pkgsrc-2012Q4 (Xen 4.1.3, from a binary
package, unsure which compiler was used to build it).  Likewise the
patch fixed the issue for me;  I used gcc 4.5.3.

Regards,
-- 
Steven Chamberlain
steven@xxxxxxxxxxx

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