<html><head><style type='text/css'>body { font-family: 'Arial'; font-size: 10pt; color: #000000}</style></head><body>Am experiencing a domU panic when running 32bit RHEL4 (2.6.9-67.ELxenU) on 64bit RHEL5 (2.6.18-53.el5xen) under high load conditions. Problem has not occurred (so far) when hosting the same domU on 32bit RHEL5, so I'm a little stumped. Any ideas or recommendations would be greatly appreciated. Thanks in advance!<br><br>Unable to handle kernel NULL pointer dereference at virtual address 00000000<br> printing eip:<br>c01496c9<br>2c84c000 -> *pde = 00000000:9a3e9027<br>1b3eb000 -> *pme = 00000000:bfd81067<br>1c064000 -> *pte = 00000000:00000000<br>Oops: 0000 [#1]<br>SMP <br>Modules linked in: md5 ipv6 autofs4 sunrpc dm_mirror xennet ext3 jbd dm_mod xenblk sd_mod scsi_mod<br>CPU: 0<br>EIP: 0061:[<c01496c9>] Not tainted VLI<br>EFLAGS: 00010287 (2.6.9-67.ELxenU) <br>EIP is at zap_pte_range+0x279/0x489<br>eax: 00046000 ebx: 00000000 ecx: f5392000 edx: 00000000<br>esi: 000b0b21 edi: c1f75bc0 ebp: 00000000 esp: e5aa3e04<br>ds: 007b es: 007b ss: 0068<br>Process amavisd (pid: 30894, threadinfo=e5aa3000 task=e54146c0)<br>Stack: b0b21067 00000000 00000000 00000000 00000000 00000000 00046000 0a800000 <br> c202d2a0 e548a2a8 0a846000 00000000 0a800000 c0149980 c202d2a0 e548a2a0 <br> 0a800000 00046000 00000000 0a7c6000 e5486008 0a846000 00000000 c01499e5 <br>Call Trace:<br> [<c0149980>] zap_pmd_range+0xa7/0xcb<br> [<c01499e5>] unmap_page_range+0x41/0x65<br> [<c0149ad6>] unmap_vmas+0xcd/0x1e8<br> [<c014ec19>] exit_mmap+0x85/0x15b<br> [<c011a2d9>] mmput+0x52/0x77<br> [<c011a74b>] copy_mm+0x36c/0x396<br> [<c011b26a>] copy_process+0x6b5/0xb0b<br> [<c011b7ad>] do_fork+0x8a/0x16b<br> [<c0105cff>] sys_clone+0x24/0x28<br> [<c010734f>] syscall_call+0x7/0xb<br>Code: 8b 4c 24 14 8b 41 04 85 c0 75 0a 83 39 00 0f 45 c1 89 44 24 14 c7 44 24 10 00 00 00 00 8b 44 24 18 39 44 24 10 0f 83 08 02 00 00 <8b> 55 00 8b 4d 04 85 d2 75 08 85 c9 0f 84 e6 01 00 00 88 d0 a8 <br></body></html>