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xen-devel
[Xen-devel] Re: credit2 BUG_ON triggered
John,
Thanks for your help looking into this. Just to clarify, you're running
squeeze in HVM mode (not PV mode)?
-George
On Tue, 2011-04-19 at 21:58 +0100, John Weekes wrote:
> I am testing credit2 on a dual Xeon L5640 machine. I have an HVM Debian
> Squeeze domU that reliably leads to a panic when it's run with the
> credit2 scheduler, but not with credit.
>
> The reproduction steps on this machine are simple:
>
> 1. Fully boot up the machine.
> 2. Enter commands that cause dom0 to use 100% CPU. For instance:
>
> screen -AmdS burn1 perl -e 'while(1) {}'
> screen -AmdS burn2 perl -e 'while(1) {}'
> screen -AmdS burn3 perl -e 'while(1) {}'
> screen -AmdS burn4 perl -e 'while(1) {}'
>
> 3. Start up the prepared Squeeze domU (which is a stock install), with
> "xm" ("xl" doesn't work with debug=y because of a spurious assert, but
> has the same problem with debug=n):
>
> cd /servers/customers
> xm create testvds4.cfg
>
> The serial console then shows this:
>
> (XEN) irq.c:324: Dom1 callback via changed to Direct Vector 0xe9
> (XEN) Xen BUG at sched_credit2.c:1606
> (XEN) ----[ Xen-4.1.1-rc1-pre x86_64 debug=y Not tainted ]----
> (XEN) CPU: 12
> (XEN) RIP: e008:[<ffff82c48011a383>] csched_schedule+0xdb/0xab1
> (XEN) RFLAGS: 0000000000010082 CONTEXT: hypervisor
> (XEN) rax: ffff830c2246c000 rbx: ffff830c2246bd10 rcx: 0000000000000000
> (XEN) rdx: 0000000000000001 rsi: ffff82c480241680 rdi: ffff8300bf74c000
> (XEN) rbp: ffff83043b28fe38 rsp: ffff83043b28fd58 r8: 0000000000000002
> (XEN) r9: 000000000000003e r10: 0000000000000018 r11: 00000000000186a0
> (XEN) r12: 0000000000000000 r13: ffff83043ffe02d0 r14: 000000000000000c
> (XEN) r15: ffff83043ffe0010 cr0: 000000008005003b cr4: 00000000000026f0
> (XEN) cr3: 0000000c22436000 cr2: 0000000000000000
> (XEN) ds: 0000 es: 0000 fs: 0000 gs: 0000 ss: 0000 cs: e008
> (XEN) Xen stack trace from rsp=ffff83043b28fd58:
> (XEN) ffff82c4801bc822 ffff83043b298040 0000000000000282 ffff83043b28fd88
> (XEN) ffff82c48012248f ffff8300bf74c000 ffff83043b28fdb8 ffff82c4801b59bd
> (XEN) 00000014c77c5137 ffff83043b28fe68 ffff82c480241680 0000000000000001
> (XEN) 00007cfbc4d70217 ffff82c48014b2c0 ffff83043b298060 ffff83043b28fde8
> (XEN) ffff82c480124345 ffff83043b298060 ffff83043b28fe38 0000000000000082
> (XEN) 00000000000186a0 0000000000000082 000000000000000c ffff8300bf74c000
> (XEN) 0000000000000000 ffff82c480241680 ffff83043b298040 ffff83043b298060
> (XEN) ffff83043b28feb8 ffff82c48012061c ffff83043b28feb8 00000014c77c5137
> (XEN) 0000000000000293 ffff8300bf74d868 ffff82c48012248f ffff8300bf74c000
> (XEN) ffff83043b28fe98 ffff82c4801b19d0 ffff8300bf74c000 ffff82c4802a8e80
> (XEN) 00000000ffffffff ffff82c4802a8880 ffff83043b28ff18 ffffffffffffffff
> (XEN) ffff83043b28fef8 ffff82c480121caf 0440080000000001 ffff8300bf74c000
> (XEN) 0000000000000046 ffff8800018501a0 ffffffff81311470 0000000000000092
> (XEN) ffff83043b28ff08 ffff82c480121d0c ffff88000184c600 ffff82c4801bb3f1
> (XEN) 0000000000000092 ffffffff81311470 ffff8800018501a0 0000000000000046
> (XEN) ffff88000184c600 0000000000000001 00000000000186a0 0000000000000008
> (XEN) 0000000000000200 0000000000000008 0000000000000000 0000000000000002
> (XEN) 0000000000000000 0000000000000002 0000000000000007 0000beef0000beef
> (XEN) ffffffff81009308 0000beef0000beef 0000000000000046 ffff880031e63e58
> (XEN) 000000000000beef 000000000000beef 000000000000beef 000000000000beef
> (XEN) Xen call trace:
> (XEN) [<ffff82c48011a383>] csched_schedule+0xdb/0xab1
> (XEN) [<ffff82c48012061c>] schedule+0x122/0x60c
> (XEN) [<ffff82c480121caf>] __do_softirq+0x8d/0x9e
> (XEN) [<ffff82c480121d0c>] do_softirq+0x4c/0x4e
> (XEN)
> (XEN)
> (XEN) ****************************************
> (XEN) Panic on CPU 12:
> (XEN) Xen BUG at sched_credit2.c:1606
> (XEN) ****************************************
> (XEN)
> (XEN) Reboot in five seconds...
>
> Where do we go from here?
>
> -John
>
> For reference, xl info output:
>
> dallas-dodec226-5 ~ # xl info
> host : dallas-dodec226-5
> release : 2.6.32.37-gbe57219
> version : #1 SMP Tue Apr 19 00:14:46 CDT 2011
> machine : x86_64
> nr_cpus : 24
> nr_nodes : 2
> cores_per_socket : 6
> threads_per_core : 2
> cpu_mhz : 2266
> hw_caps :
> bfebfbff:2c100800:00000000:00003f40:009ee3fd:00000000:00000001:00000000
> virt_caps : hvm hvm_directio
> total_memory : 49143
> free_memory : 47106
> free_cpus : 0
> xen_major : 4
> xen_minor : 1
> xen_extra : .1-rc1-pre
> 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 : credit2
> xen_pagesize : 4096
> platform_params : virt_start=0xffff800000000000
> xen_changeset : Thu Apr 07 15:26:58 2011 +0100 23025:dbf2ddf652dc
> xen_commandline : dom0_mem=1500M dom0_max_vcpus=4
> iommu=dom0-passthrough sched=credit2 loglvl=all guest_loglvl=all
> com2=115200,8n1 console=com2
> cc_compiler : gcc version 4.4.5 (Gentoo 4.4.5 p1.2, pie-0.4.5)
> cc_compile_by : root
> cc_compile_domain : nuclearfallout.net
> cc_compile_date : Tue Apr 19 14:26:02 CDT 2011
> xend_config_format : 4
>
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