Oops in zap_pmd_range

[Nivedita Singhvi <niv@us.ibm.com>]

I got the following on the April 1st nightly source release
of the unstable tree.

2 CPU machine, SMP not configured, default configs for
dom0 (256MB) and dom1 (512MB).

Idle system for the most part, and I wasn't at the machine,
came back to find this scrolling of my screen and in /var/log
messages. Dom1 was hosed. Had to reboot subsequently.

Ran some tests (netperf) between dom0 and dom1 to see
if I could reproduce it, but haven't. I've since upgraded
to 4/12/05 nightly snapshot. Haven't seen it again yet.

Does this look like a valid kernel/oops? Any info that
I could dig up?

Apr 12 15:29:48 nivdom1 kernel: Unable to handle kernel paging request 
at virtua
l address c6ec35e4
Apr 12 15:29:48 nivdom1 kernel:  printing eip:
Apr 12 15:29:48 nivdom1 kernel: c01434f6
Apr 12 15:29:48 nivdom1 kernel: *pde = ma 7ff64067 pa 00019067
Apr 12 15:29:48 nivdom1 kernel: *pte = ma 079aa063 pa 06ec3063
Apr 12 15:29:48 nivdom1 kernel:  [<c0143718>] zap_pmd_range+0x57/0x75
Apr 12 15:29:48 nivdom1 kernel:  [<c0143770>] zap_pud_range+0x3a/0x5e
Apr 12 15:29:48 nivdom1 kernel:  [<c0143808>] unmap_page_range+0x74/0x8b
Apr 12 15:29:48 nivdom1 kernel:  [<c014391c>] unmap_vmas+0xfd/0x223
Apr 12 15:29:48 nivdom1 kernel:  [<c01489b7>] exit_mmap+0x84/0x156
Apr 12 15:29:48 nivdom1 kernel:  [<c01158ee>] mmput+0x2b/0x94
Apr 12 15:29:48 nivdom1 kernel:  [<c015e899>] exec_mmap+0xcb/0x12b
Apr 12 15:29:48 nivdom1 kernel:  [<c015eaae>] flush_old_exec+0x123/0x9ca
Apr 12 15:29:48 nivdom1 kernel:  [<c015436b>] vfs_read+0xb9/0x129
Apr 12 15:29:48 nivdom1 kernel:  [<c015e7c5>] kernel_read+0x4a/0x53
Apr 12 15:29:48 nivdom1 kernel:  [<c017c627>] load_elf_binary+0x37d/0xc9a
Apr 12 15:29:48 nivdom1 kernel:  [<c013910e>] buffered_rmqueue+0x153/0x2ba
Apr 12 15:29:48 nivdom1 kernel:  [<c02016e9>] copy_from_user+0x3d/0x64
Apr 12 15:29:48 nivdom1 kernel:  [<c017c2aa>] load_elf_binary+0x0/0xc9a
Apr 12 15:29:48 nivdom1 kernel:  [<c015f5ee>] 
search_binary_handler+0xbb/0x2e9

thanks,
Nivedita