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[Xen-bugs] [Bug 93] New: x86_64 - Dom0 crashes when DomU is created.

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Subject: [Xen-bugs] [Bug 93] New: x86_64 - Dom0 crashes when DomU is created.
From: dbarrera@xxxxxxxxxx
Date: Fri, 08 Jul 2005 19:32:56 +0000
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           Summary: x86_64 - Dom0 crashes when DomU is created.
           Product: Xen
           Version: unstable
          Platform: x86-64
        OS/Version: other
            Status: NEW
          Severity: major
          Priority: P2
         Component: Hypervisor
        AssignedTo: xen-bugs@xxxxxxxxxxxxxxxxxxx
        ReportedBy: dbarrera@xxxxxxxxxx
                CC: hohnbaum@xxxxxxxxxx

I am seeing Dom0 crash on x86_64 (EMT64) when creating a DomU. DomU is created,
but shortly after seeing the login prompt, the machine locks up. The following
trace shows up on the serial console at that point:

Unable to handle kernel NULL pointer dereference at 0000000000000c20 RIP:
PGD 3a8b067 PUD 32d2067 PMD 0
Oops: 0000 [1]
Modules linked in: thermal processor fan button battery ac
Pid: 0, comm: swapper Not tainted
RIP: e030:[<ffffffff801170f8>] <ffffffff801170f8>{do_page_fault+408}
RSP: e02b:ffffffff80513a00  EFLAGS: 00010202
RAX: 00000000013e4067 RBX: 0000000000000c20 RCX: 0000000000000000
RDX: 0000000000000067 RSI: 00000000093e4067 RDI: ffff800000000000
RBP: 0000000000000000 R08: 00000000000000ff R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000c20
R13: ffffffff80513b00 R14: ffffc20000036000 R15: ffffffff8041c500
FS:  00002aaaabc65d80(0000) GS:ffffffff804ff700(0000) knlGS:0000000000000000
CS:  e033 DS: 0000 ES: 0000
Process swapper (pid: 0, threadinfo ffffffff80512000, task ffffffff8041c500)
Stack: 0000000000000007 0000000700000000 ffff88000a96ab00 0000000000000000
       ffffffff80513b00 ffffffff803c1f70 0000000000000000 0000000b0000000e
       ffff88000f9ea000 0000000000030001
Call Trace:<ffffffff8038d727>{br_pass_frame_up+87}

Note: the first time I saw this problem, I was able to login to DomU. When I
entered the 'ifconfig', the machine locked. Don't know whether this is related,
as the second time I never got to that point. It just locked before I could log 

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