Date: Thu, 24 Oct 2013 18:24:11 -0400 From: Outback Dingo <outbackdingo@gmail.com> To: =?ISO-8859-1?Q?Roger_Pau_Monn=E9?= <roger.pau@citrix.com> Cc: Konstantin Belousov <kostikbel@gmail.com>, current@freebsd.org Subject: Re: CUREENT issue with ballon.c Message-ID: <CAKYr3zw-xbWBtDvKjnFnvFU_FQx2a926bV5p692ZuX9JfX0J9Q@mail.gmail.com> In-Reply-To: <52699C97.7070105@citrix.com> References: <CAKYr3zyVXxL9A9wEY_KL8sp1yivAUG2gpK8daUMu%2BbeyU2b8pw@mail.gmail.com> <5268F37E.9050004@citrix.com> <CAKYr3zw5Se4Z-fZLgp9e9nBMxWNhXuwt1%2BTAqZJeozt=qhpmpQ@mail.gmail.com> <526986E0.2050807@citrix.com> <20131024211507.GD10625@kib.kiev.ua> <52699C97.7070105@citrix.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On Thu, Oct 24, 2013 at 6:17 PM, Roger Pau Monn=E9 <roger.pau@citrix.com>wr=
ote:
> On 24/10/13 22:15, Konstantin Belousov wrote:
> > On Thu, Oct 24, 2013 at 09:45:20PM +0100, Roger Pau Monn? wrote:
> >> On 24/10/13 13:01, Outback Dingo wrote:
> >>>
> >>>
> >>> On Thu, Oct 24, 2013 at 6:16 AM, Roger Pau Monn? <roger.pau@citrix.co=
m
> >>> <mailto:roger.pau@citrix.com>> wrote:
> >>>
> >>> On 24/10/13 03:02, Outback Dingo wrote:
> >>> > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --=
-
> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable lock=
s
> held:
> >>> > exclusive sleep mutex balloon_lock (balloon_lock) r =3D 0
> >>> > (0xffffffff816e9c58) locked @
> >>> /usr/src/sys/dev/xen/balloon/balloon.c:339
> >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r =3D 0
> >>> > (0xffffffff816e9c38) locked @
> >>> /usr/src/sys/dev/xen/balloon/balloon.c:373
> >>> > KDB: stack backtrace:
> >>> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> >>> > 0xfffffe00002c67c0
> >>> > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00002c6870
> >>> > witness_warn() at witness_warn+0x4a8/frame 0xfffffe00002c6930
> >>> > uma_zalloc_arg() at uma_zalloc_arg+0x3b/frame 0xfffffe00002c69a=
0
> >>> > malloc() at malloc+0x101/frame 0xfffffe00002c69f0
> >>> > balloon_process() at balloon_process+0x44a/frame
> 0xfffffe00002c6a70
> >>> > fork_exit() at fork_exit+0x84/frame 0xfffffe00002c6ab0
> >>> > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00002c6a=
b0
> >>> > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --=
-
> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable lock=
s
> held:
> >>> > exclusive sleep mutex balloon_lock (balloon_lock) r =3D 0
> >>> > (0xffffffff816e9c58) locked @
> >>> /usr/src/sys/dev/xen/balloon/balloon.c:339
> >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r =3D 0
> >>> > (0xffffffff816e9c38) locked @
> >>> /usr/src/sys/dev/xen/balloon/balloon.c:373
> >>> > KDB: stack backtrace:
> >>> > db_trace_self_wrapper() at db_trace_self_wrapper+0x2b/frame
> >>> > 0xfffffe00002c67c0
> >>> > kdb_backtrace() at kdb_backtrace+0x39/frame 0xfffffe00002c6870
> >>> > witness_warn() at witness_warn+0x4a8/frame 0xfffffe00002c6930
> >>> > uma_zalloc_arg() at uma_zalloc_arg+0x3b/frame 0xfffffe00002c69a=
0
> >>> > malloc() at malloc+0x101/frame 0xfffffe00002c69f0
> >>> > balloon_process() at balloon_process+0x44a/frame
> 0xfffffe00002c6a70
> >>> > fork_exit() at fork_exit+0x84/frame 0xfffffe00002c6ab0
> >>> > fork_trampoline() at fork_trampoline+0xe/frame 0xfffffe00002c6a=
b0
> >>> > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 --=
-
> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable lock=
s
> held:
> >>>
> >>> Did you do anything specific to trigger the crash? Can you explai=
n
> the
> >>> steps needed to reproduce it?
> >>>
> >>>
> >>> just recompiled a kernel, and booted it scrolls continuously across t=
he
> >>> screen
> >>> doesnt seem to ever stop.
> >>
> >> I've tried r257051 and it seems to work fine, could you please post yo=
ur
> >> Xen version, the config file used to launch the VM and the toolstack
> used?
> >
> > Do you have witness enabled in your kernel config ?
>
> Yes, but I'm not touching balloon memory target.
>
> > There is an obvious case of calling malloc(M_WAITOK) while holding both
> > balloon_lock and balloon_mutex:
> > ballon_process->decrease_reservation->balloon_append.
>
> Yes, I'm aware of that, it's just that it shouldn't happen unless you
> actually trigger a balloon memory decrease, which should not happen
> automatically AFAIK, that's why I was asking if this was happening
> without the user specifically requesting it.
>
> Anyway, this should be clearly fixed and pulled into 10 no matter what
> triggered it. I will send a patch as soon as possible.
>
>
Yes, WITNESS was enabled, im using Kubuntu / XEN kernel / and
virt-manager.... it was fine running Current, until i ran updates this week
then encountered this. Ive since disabled WITNESS with a recompile, but the
VM still apears more sluggish then before.
root@M14xR2:/home/dingo# xm info
host : M14xR2
release : 3.11.0-12-generic
version : #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013
machine : x86_64
nr_cpus : 4
nr_nodes : 1
cores_per_socket : 2
threads_per_core : 2
cpu_mhz : 2494
xen:/// capabilities:
<capabilities>
<host>
<cpu>
<arch>x86_64</arch>
<features>
<pae/>
</features>
</cpu>
<power_management>
<suspend_mem/>
<suspend_disk/>
<suspend_hybrid/>
</power_management>
<migration_features>
<live/>
<uri_transports>
<uri_transport>xenmigr</uri_transport>
</uri_transports>
</migration_features>
</host>
<guest>
<os_type>xen</os_type>
<arch name=3D'x86_64'>
<wordsize>64</wordsize>
<emulator>qemu-dm</emulator>
<machine>xenpv</machine>
<domain type=3D'xen'>
</domain>
</arch>
</guest>
<guest>
<os_type>xen</os_type>
<arch name=3D'i686'>
<wordsize>32</wordsize>
<emulator>qemu-dm</emulator>
<machine>xenpv</machine>
<domain type=3D'xen'>
</domain>
</arch>
<features>
<pae/>
</features>
</guest>
<guest>
<os_type>hvm</os_type>
<arch name=3D'i686'>
<wordsize>32</wordsize>
<emulator>qemu-dm</emulator>
<loader>hvmloader</loader>
<machine>xenfv</machine>
<domain type=3D'xen'>
</domain>
</arch>
<features>
<pae/>
<nonpae/>
<acpi default=3D'on' toggle=3D'yes'/>
<apic default=3D'on' toggle=3D'no'/>
<hap default=3D'off' toggle=3D'yes'/>
<viridian default=3D'off' toggle=3D'yes'/>
</features>
</guest>
<guest>
<os_type>hvm</os_type>
<arch name=3D'x86_64'>
<wordsize>64</wordsize>
<emulator>qemu-dm</emulator>
<loader>hvmloader</loader>
<machine>xenfv</machine>
<domain type=3D'xen'>
</domain>
</arch>
<features>
<acpi default=3D'on' toggle=3D'yes'/>
<apic default=3D'on' toggle=3D'no'/>
<hap default=3D'off' toggle=3D'yes'/>
<viridian default=3D'off' toggle=3D'yes'/>
</features>
</guest>
</capabilities>
hw_caps :
bfebfbff:28100800:00000000:00007f00:77bae3bf:00000000:00000001:00000281
virt_caps : hvm
total_memory : 8074
free_memory : 12
free_cpus : 0
xen_major : 4
xen_minor : 3
xen_extra : .0
xen_caps : xen-3.0-x86_64 xen-3.0-x86_32p hvm-3.0-x86_32
hvm-3.0-x86_32p hvm-3.0-x86_64
xen_scheduler : credit
xen_pagesize : 4096
platform_params : virt_start=3D0xffff800000000000
xen_changeset :
xen_commandline : placeholder
cc_compiler : gcc (Ubuntu/Linaro 4.8.1-10ubuntu5) 4.8.1
cc_compile_by : stefan.bader
cc_compile_domain : canonical.com
cc_compile_date : Wed Oct 2 11:17:12 UTC 2013
xend_config_format : 4
root@M14xR2:/home/dingo# uname -a
Linux M14xR2 3.11.0-12-generic #19-Ubuntu SMP Wed Oct 9 16:20:46 UTC 2013
x86_64 x86_64 x86_64 GNU/Linux
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?CAKYr3zw-xbWBtDvKjnFnvFU_FQx2a926bV5p692ZuX9JfX0J9Q>