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 _at_ > >>> /usr/src/sys/dev/xen/balloon/balloon.c:339 > >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r = 0 > >>> > (0xffffffff816e9c38) locked _at_ > >>> /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 _at_ > >>> /usr/src/sys/dev/xen/balloon/balloon.c:339 > >>> > exclusive sleep mutex balloon_mutex (balloon_mutex) r = 0 > >>> > (0xffffffff816e9c38) locked _at_ > >>> /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/LinuxReceived on Thu Oct 24 2013 - 20:24:12 UTC
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