CUREENT issue with ballon.c
Outback Dingo
outbackdingo at gmail.com
Thu Oct 24 22:26:47 UTC 2013
On Thu, Oct 24, 2013 at 6:24 PM, Outback Dingo <outbackdingo at gmail.com>wrote:
>
>
>
> On Thu, Oct 24, 2013 at 6:17 PM, Roger Pau Monné <roger.pau at 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 at citrix.com
>> >>> <mailto:roger.pau at citrix.com>> wrote:
>> >>>
>> >>> On 24/10/13 03:02, Outback Dingo wrote:
>> >>> > --- trap 0, rip = 0, rsp = 0xfffffe00002c6b70, rbp = 0 ---
>> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable
>> locks held:
>> >>> > exclusive sleep mutex balloon_lock (balloon_lock) r = 0
>> >>> > (0xffffffff816e9c58) locked @
>> >>> /usr/src/sys/dev/xen/balloon/balloon.c:339
>> >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r = 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 0xfffffe00002c69a0
>> >>> > 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 = 0, rsp = 0xfffffe00002c6b70, rbp = 0 ---
>> >>> > uma_zalloc_arg: zone "16" with the following non-sleepable
>> locks held:
>> >>> > exclusive sleep mutex balloon_lock (balloon_lock) r = 0
>> >>> > (0xffffffff816e9c58) locked @
>> >>> /usr/src/sys/dev/xen/balloon/balloon.c:339
>> >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r = 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 0xfffffe00002c69a0
>> >>> > 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 = 0, rsp = 0xfffffe00002c6b70, rbp = 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 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 at 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='x86_64'>
> <wordsize>64</wordsize>
> <emulator>qemu-dm</emulator>
> <machine>xenpv</machine>
> <domain type='xen'>
> </domain>
> </arch>
> </guest>
>
> <guest>
> <os_type>xen</os_type>
> <arch name='i686'>
> <wordsize>32</wordsize>
> <emulator>qemu-dm</emulator>
> <machine>xenpv</machine>
> <domain type='xen'>
> </domain>
> </arch>
> <features>
> <pae/>
> </features>
> </guest>
>
> <guest>
> <os_type>hvm</os_type>
> <arch name='i686'>
> <wordsize>32</wordsize>
> <emulator>qemu-dm</emulator>
> <loader>hvmloader</loader>
> <machine>xenfv</machine>
> <domain type='xen'>
> </domain>
> </arch>
> <features>
> <pae/>
> <nonpae/>
> <acpi default='on' toggle='yes'/>
> <apic default='on' toggle='no'/>
> <hap default='off' toggle='yes'/>
> <viridian default='off' toggle='yes'/>
> </features>
> </guest>
>
> <guest>
> <os_type>hvm</os_type>
> <arch name='x86_64'>
> <wordsize>64</wordsize>
> <emulator>qemu-dm</emulator>
> <loader>hvmloader</loader>
> <machine>xenfv</machine>
> <domain type='xen'>
> </domain>
> </arch>
> <features>
> <acpi default='on' toggle='yes'/>
> <apic default='on' toggle='no'/>
> <hap default='off' toggle='yes'/>
> <viridian default='off' toggle='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=0xffff800000000000
> 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 at 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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