[Xen-bugs] [Bug 1472] New: qemu-dm segfaults on iscsi timeout

[bugzilla-daemon@xxxxxxxxxxxxxxxxxxx]

http://bugzilla.xensource.com/bugzilla/show_bug.cgi?id=1472

           Summary: qemu-dm segfaults on iscsi timeout
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: Linux
            Status: NEW
          Severity: major
          Priority: P2
         Component: HVM
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: rikratva@xxxxxxxxx


This is on Xen 3.3.1.

I am running several (Windows) HVM DomUs. Their storage is located on an iSCSI
machine; the disks are defined like this:
'phy:/dev/disk/by-path/ip-x.x.x.x:3260-iscsi-iqn.x-x.x.x:iscsi-001-lun-1,ioemu:hda,w'.

Sometimes there is a small network timeout to the iSCSI machine, for example
when I reload the iscsi target. All para-virtual Linux DomUs keep running just
fine with their storage from this iSCSI machine, but the HVM DomUs will crash.
qemu-dm goes defunct and the state of the DomU will be "------".

Sometimes, only the HVM domains under heavy disk load will crash, and other HVM
domains will keep running like nothing happened.

It seems like qemu-dm is unable to handle even very small network timeouts,
which makes HVM DomU crash a little too often.

Snippet from kern.log when this happens and 4 DomUs crash:

Dom0 kernel: qemu-dm[26627]: segfault at 0000000000000260 rip 000000000042a337
rsp 00007fff96aaf8a0 error 4
Dom0 kernel: qemu-dm[18446]: segfault at 0000000000000260 rip 000000000042a337
rsp 00007fff38ee2cd0 error 4
Dom0 kernel: qemu-dm[28824]: segfault at 0000000000000260 rip 000000000042a2bc
rsp 00007fff7cba39b0 error 4
Dom0 kernel: qemu-dm[7711]: segfault at 0000000000000260 rip 0000000000429f37
rsp 00007fff2e8105f0 error 4


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