The following just happend to one of our 8-way Opteron cluster nodes (nfs client version 3, solaris nfs server). Just let me know if you need further info. Andre Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP: [<ffffffff80150c09>] page_to_pfn+0x0/0x33 PGD 74ba36067 PUD 0 Oops: 0000 [1] SMP CPU 0 Pid: 1782, comm: sge_execd Not tainted 2.6.18-rc5-tt64-6-gd9629953 #23 RIP: 0010:[<ffffffff80150c09>] [<ffffffff80150c09>] page_to_pfn+0x0/0x33 RSP: 0018:ffff81074b99bbb0 EFLAGS: 00010287 RAX: 0000000000000b9a RBX: 0000000000000734 RCX: 0000000000000b9a RDX: ffff81074b99bbf0 RSI: ffff810812320500 RDI: 0000000000000000 RBP: 0000000000000466 R08: ffff8104c53a89a0 R09: ffff8104c53a8810 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000000008cc R13: ffff81074b99bbf8 R14: 0000000000002000 R15: ffff8104c53a8ab8 FS: 00002b75f92987a0(0000) GS:ffffffff80703000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000000 CR3: 000000080b603000 CR4: 00000000000006a0 Process sge_execd (pid: 1782, threadinfo ffff81074b99a000, task ffff81080bc50040) Stack: ffffffff80205a72 ffff8104c53a89a0 ffff810812320380 0000000000000b9a ffff8104c53a89a0 0000000000000466 ffffffff80205cf8 0000000000000000 ffff810817df9678 0000000000000000 ffff8104c53a89a0 ffff810817df9678 Call Trace: [<ffffffff80205a72>] nfs_readpage_truncate_uninitialised_page+0x77/0xec [<ffffffff80205cf8>] nfs_readpage_sync+0x211/0x255 [<ffffffff8020677e>] nfs_readpage+0x118/0x151 [<ffffffff8014c65e>] do_generic_mapping_read+0x1ec/0x398 [<ffffffff8014c80a>] file_read_actor+0x0/0xd1 [<ffffffff8014ca52>] __generic_file_aio_read+0x177/0x1b0 [<ffffffff8014cabf>] generic_file_aio_read+0x34/0x39 [<ffffffff801fea68>] nfs_file_read+0xb1/0xc0 [<ffffffff8016df5c>] do_sync_read+0xc9/0x106 [<ffffffff8013e541>] autoremove_wake_function+0x0/0x2e [<ffffffff8015bd8e>] do_mmap_pgoff+0x5fd/0x6de [<ffffffff8016e046>] vfs_read+0xad/0x14c [<ffffffff8016e380>] sys_read+0x45/0x6e [<ffffffff80109726>] system_call+0x7e/0x83 Code: 48 8b 07 48 c1 e8 3a 48 8b 14 c5 00 c8 70 80 48 b8 b7 6d db RIP [<ffffffff80150c09>] page_to_pfn+0x0/0x33 RSP <ffff81074b99bbb0> CR2: 0000000000000000 -- The only person who always got his work done by Friday was Robinson Crusoe
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