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Description of problem: (copy from bug 553249#c11 ~ 553249#c14) there are 15 window xp guest running simultaneously. connecting by vnc. 10 of them are loaded by iometer and cpuhog. the host is Intel Core(TM)2 Quad Q9400, 4cores. (detail in additional infor ) several hours later. in guest. a warning dialog "Display Driver Stopped Responding" pop up. and finally guest BSOD.(log will upload ) CLI : root 6669 3957 64 Jan19 pts/0 01:23:18 /usr/libexec/qemu-kvm -m 1024 -smp 1 -drive file=winXP-32.raw,if=ide -net nic,macaddr=DE:AD:BE:EF:00:00 -net tap -boot c -uuid debd696c-a5b0-4ec9-98e4-329fdbeab007 -usbdevice tablet -rtc-td-hack -no-kvm-pit-reinjection -monitor stdio -notify all -balloon none -vnc :1 -vmchannel di:0200,tcp:0:7890,server,nowait -drive file=/data/t200/test,if=ide -name t200:1 when I test 5 vms with vnc,all vms are healthy in the 12 hour testing. when I test 15 vms with spice, vms also healthy in the 36 hour testing. Version-Release number of selected component (if applicable): kvm-83-105.el5_4.19 How reproducible: I just test once. all guest BSOD. Steps to Reproduce: 1.start as many as possible window guest with vnc 2.in guest,generate i/o and cpu load 3. Actual results: Expected results: Additional info: processor : 3 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz stepping : 10 cpu MHz : 2660.003 cache size : 3072 KB physical id : 0 siblings : 4 core id : 3 cpu cores : 4 apicid : 3 fpu : yes fpu_exception : yes cpuid level : 13 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx smx est tm2 ssse3 cx16 xtpr sse4_1 lahf_lm bogomips : 5319.98 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management:
Created attachment 386087 [details] Display Driver Stopped Responding
Created attachment 386088 [details] BSOD
Created attachment 386089 [details] minidump
What kind of tests do the iometer instances run? Network? Disk? Both? Was a vnc viewer connected while running the tests?
(In reply to comment #4) > What kind of tests do the iometer instances run? Network? Disk? Both? > Was a vnc viewer connected while running the tests? only Disk testing . read/write, QD from 1 to 32. and vnc is connecting during whole test.
This request was evaluated by Red Hat Product Management for inclusion in the current release of Red Hat Enterprise Linux. Because the affected component is not scheduled to be updated in the current release, Red Hat is unfortunately unable to address this request at this time. Red Hat invites you to ask your support representative to propose this request, if appropriate and relevant, in the next release of Red Hat Enterprise Linux.
This request was erroneously denied for the current release of Red Hat Enterprise Linux. The error has been fixed and this request has been re-proposed for the current release.
Not sure if it is fixable, MS has a watch dog timer, if the host is too loaded we won't be schedule the guests fast enough. We need to find the registry setting to disable it and state that over release notes (similar of rhel6 as well)
Please try disabling the display watchdog. http://msdn.microsoft.com/en-us/library/ff553890%28v=vs.85%29.aspx
*** This bug has been marked as a duplicate of bug 680341 ***