Date: Thu, 24 Oct 2013 18:26:46 -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: <CAKYr3zyUQ_hv5-MS59N9XPT9fSqV=goPMuFi_39QvCDO5FD4uA@mail.gmail.com> In-Reply-To: <CAKYr3zw-xbWBtDvKjnFnvFU_FQx2a926bV5p692ZuX9JfX0J9Q@mail.gmail.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> <CAKYr3zw-xbWBtDvKjnFnvFU_FQx2a926bV5p692ZuX9JfX0J9Q@mail.gmail.com>
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On Thu, Oct 24, 2013 at 6:24 PM, Outback Dingo <outbackdingo@gmail.com>wrot= e: > > > > On Thu, Oct 24, 2013 at 6:17 PM, Roger Pau Monn=E9 <roger.pau@citrix.com>= wrote: > >> 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.com >> >>> <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 >> locks 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 0xfffffe00002c69= a0 >> >>> > 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 >> 0xfffffe00002c6ab0 >> >>> > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 -= -- >> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable >> locks 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 0xfffffe00002c69= a0 >> >>> > 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 >> 0xfffffe00002c6ab0 >> >>> > --- trap 0, rip =3D 0, rsp =3D 0xfffffe00002c6b70, rbp =3D 0 -= -- >> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable >> locks held: >> >>> >> >>> Did you do anything specific to trigger the crash? Can you >> explain the >> >>> steps needed to reproduce it? >> >>> >> >>> >> >>> just recompiled a kernel, and booted it scrolls continuously across >> the >> >>> screen >> >>> doesnt seem to ever stop. >> >> >> >> I've tried r257051 and it seems to work fine, could you please post >> your >> >> 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 bot= h >> > 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 we= ek > then encountered this. Ive since disabled WITNESS with a recompile, but t= he > 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 > and it appears to be XEN 4.3 kernel from installed via Kubuntu apt-get
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