[Xen-devel] Xen 2 crashes

["Pradeep Vincent" <pradeep.vincent@xxxxxxxxx>]

I have been seeing kernel address dereference failures on Xen 2 domU
s. They usually happen after the xen kernel kmallocs some memory and
then tries to access it. Looks like the PDE is marked Read / Write
while the PTE  is marked Read-only. I would think it should be the
other way around  under normal circumstances - anybody seen this kind
of problem.

Unable to handle kernel paging request at virtual address ee0f1000
printing eip:
c01ac9d0
*pde=9bdf0063(000b6063)
*pte=89ebd061(2e0f1061)
Oops: 0003
CPU:    0
EIP:    0819:[<c01ac9d0>]    Not tainted
EFLAGS: 00010246
eax: 00000000   ebx: ee0f1000   ecx: 00000400   edx: 00001000
esi: 00001000   edi: ee0f1000   ebp: ec507f58   esp: ec507f38
ds: 0821   es: 0821   ss: 0821
Process wine (pid: 9297, stackpage=ec507000)<1>
Stack: 00001000 000001f0 ec507f5c 00000000 00000000 ec506000 bffffa9c ec507f98
     ec507fa4 c01ad283 ee280eb8 00000200 00000001 40018000 40021000 edce1e60
     40018000 ee280ebc ffffffea ee280e40 00000000 4004bf40 00000420
00000041 Call Trace: [<c01ad283>] [<c01ad2ee>] [<c01aa0e7>]

<1>Unable to handle kernel paging request at virtual address ed8c4000
printing eip:
c01c30ed
*pde=479e9063(000b4063)
*pte=acb5a061(2d8c4061)
Oops: 0003
CPU:    0
EIP:    0819:[<c01c30ed>]    Not tainted
EFLAGS: 00010286
eax: ed8c4000   ebx: c02a5028   ecx: 00000017   edx: 0000005d
esi: c02a5028   edi: ed8c4000   ebp: edba3f5c   esp: edba3ecc
ds: 0821   es: 0821   ss: 0821
Process perl (pid: 1011, stackpage=edba3000)<1>
Stack: edba3f20 c0134084 c1b3a1a0 edba3f04 00000001 c01337ad ed9b8006 edba3f34
     edba3efc 00000001 fffffffe eacbd440 edba3f7c eb79e560 ed9b8006 0000000a
     2a11d6cb edba3f1c 40000000 00001000 edba3f44 c0117853 ee2804e0
40000000 Call Trace: [<c0134084>] [<c01337ad>] [<c0117853>]
[<c01176d1>] [<c0142550>]
 [<c0129326>] [<c01aa0e7>]

<1>Unable to handle kernel paging request at virtual address edb42000
printing eip:
c01ac9d0
*pde=479e9063(000b4063)
*pte=924cc061(2db42061)
Oops: 0003
CPU:    0
EIP:    0819:[<c01ac9d0>]    Not tainted
EFLAGS: 00010246
eax: 00000000   ebx: edb42000   ecx: 00000400   edx: 00001000
esi: 00001000   edi: edb42000   ebp: edac1f58   esp: edac1f38
ds: 0821   es: 0821   ss: 0821
Process wine (pid: 9307, stackpage=edac1000)<1>
Stack: 00001000 000001f0 edac1f5c 00000000 00000000 edac0000 bffffa9c edac1f98
     edac1fa4 c01ad283 ee280cd8 00000200 00000001 e9e99eb4 c0105e56 edac1fa4
     ee280c60 ee280cdc ffffffea ee280c60 00000000 4004bf40 00000420
00000041 Call Trace: [<c01ad283>] [<c0105e56>] [<c01ad2ee>]
[<c01aa147>]

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