DomU Oopsing on xen-3.0-testing changeset 8259

[Charles Duffy <cduffy@spamcop.net>]

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One of my DomUs is sporadically oopsing, roughly once per day. This was 
first observed on a pre-3.0-release changeset; after upgrading to 
changeset 8259 on the xen-3.0-testing branch (after the release), it 
still occurs.

This effectively kills the instance when it occurs -- worse, the 
instance in question *stays* down even though panic=5 is specified as an 
extra parameter to be passed to the DomU kernel.

The text of the oops is attached, as are my kernel configs (which are a 
touch nonstandard).

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Unable to handle kernel NULL pointer dereference at 0000000000000a33 RIP:
<ffffffff8013e0a3>{__dequeue_signal+275}
PGD 11146067 PUD 185ee067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: ipv6 dm_mod
Pid: 2642, comm: java Tainted: GF     2.6.12.6-xenU
RIP: e030:[<ffffffff8013e0a3>] <ffffffff8013e0a3>{__dequeue_signal+275}
RSP: e02b:ffff88002aa1be58  EFLAGS: 00010046
RAX: 0000000000000a33 RBX: ffff880013d3fa88 RCX: 0000000000000009
RDX: 0000000000000200 RSI: 0000000000000a33 RDI: ffff880013d3fa88
RBP: ffff88003e680a30 R08: ffff88002aa1a000 R09: 0000000000000000
R10: 0000000000000060 R11: 0000000000000612 R12: 000000000000000a
R13: ffff88002aa1bec8 R14: 0000000000000000 R15: 0000000000000000
FS:  0000000048c34960(0063) GS:ffffffff803e9d80(0000) knlGS:ffffffff803e9d80
CS:  e033 DS: 0000 ES: 0000
Process java (pid: 2642, threadinfo ffff88002aa1a000, task ffff880013d3f4b0)
Stack: 0000000000000000 ffff88002aa1bec0 ffff88002aa1bec8 ffff880013d3f4b0
       0000000000000000 ffffffff8013e1dd ffff88002aa1bed8 0000000000000000
       0000000000000000 7fffffffffffffff
Call Trace:<ffffffff8013e1dd>{dequeue_signal+45} <ffffffff80140a1d>{sys_rt_sigtimedwait+589}
       <ffffffff80140d93>{sys_tgkill+291} <ffffffff801403cd>{sigprocmask+253}
       <ffffffff801404d3>{sys_rt_sigprocmask+211} <ffffffff80112406>{system_call+134}
       <ffffffff80112380>{system_call+0}

Code: 48 8b 00 0f 18 08 48 39 de 75 e2 48 85 ed 0f 84 84 00 00 00
RIP <ffffffff8013e0a3>{__dequeue_signal+275} RSP <ffff88002aa1be58>
CR2: 0000000000000a33

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