[Xen-users] Xen breaks under high I/O load

["Ricardo Tiago" <rtiago@xxxxxxxxx>]

Hi,

When performing high I/O operations on the guests, xen just breaks and
the guest dies.

 login: Unable to handle kernel NULL pointer dereference a
t virtual address 00000b54
 printing eip:
c01493b1
0c735000 -> *pde = 00000000:73639027
0b19c000 -> *pme = 00000000:71421067
0f62b000 -> *pte = 00000000:00000000
Oops: 0002 [#1]
SMP
Modules linked in: libafs(U) autofs4 sunrpc md5 ipv6 dm_mirror dm_mod xennet xen
blk ext3 jbd
CPU:    0
EIP:    0061:[<c01493b1>]    Tainted: PF     VLI
EFLAGS: 00010202   (2.6.9-67.0.4.EL.cernxenU)
EIP is at copy_page_range+0x491/0x52c
eax: 00000b50   ebx: 4bf99065   ecx: cd098300   edx: 4bf99045
esi: 00000000   edi: c1156180   ebp: 00010800   esp: cb199ec0
ds: 007b   es: 007b   ss: 0068
Process yum (pid: 2100, threadinfo=cb199000 task=ce250cd0)
Stack: 4ffc5067 00000000 00000b50 c9438b50 cc5bb250 cb19c250 00000001 0b504000
       0956a000 cc5ba000 cc735000 cd098344 cce5064c c93bf494 cd098300 c011a6b8
       cd098300 cd098080 cce5064c 00001f9a 00000000 cce50668 cce50670 cce50658
Call Trace:
 [<c011a6b8>] copy_mm+0x2d9/0x396
 [<c011b26a>] copy_process+0x6b5/0xb0b
 [<c011b7ad>] do_fork+0x8a/0x16b
 [<c012736e>] sigprocmask+0xb6/0xd0
 [<c012741f>] sys_rt_sigprocmask+0x97/0x14c
 [<c0105cff>] sys_clone+0x24/0x28
 [<c010734f>] syscall_call+0x7/0xb
Code: 89 f9 83 e2 df f6 c4 80 74 03 8b 4f 0c f0 ff 41 04 8b 4c 24 40 ff 81 80 00
 00 00 f6 47 10 01 74 06 ff 81 84 00 00 00 8b 44 24 08 <89> 70 04 89 10 f0 ff 47
 08 81 44 24 20 00 10 00 00 8b 54 24 1c
 <0>Fatal exception: panic in 5 seconds
Kernel panic - not syncing: Fatal exception

Using this xen version : https://rhn.redhat.com/errata/RHSA-2008-0194.html

Any ideas on why this happens?

Thank you,
Ricardo

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