Karsten Weiss wrote: > Here's a diff of a corrupted and a good file written during our > testcase: > > ("-" == corrupted file, "+" == good file) > ... > 009f2ff0 67 2a 4c c4 6d 9d 34 44 ad e6 3c 45 05 9a 4d c4 > |g*L.m.4D..<E..M.| > -009f3000 39 60 e6 44 20 ab 46 44 56 aa 46 44 c2 35 e6 44 |9.D .FDV.FD.5.D| > .... > +009f3ff0 f3 55 92 44 c1 10 6c 45 5e 12 a0 c3 60 31 93 44 |.U.D..lE^...1.D| > 009f4000 88 cd 6b 45 c1 6d cd c3 00 a5 8b 44 f2 ac 6b 45 > |..kE.m.....D..kE| > Well as I told in my mails to the list I made the experience that not all bytes of the corrupted area are invalid,.. but only some,.. while it seems that in you diff ALL the bytes are wrong, right?
> Please notice: > > a) the corruption begins at a page boundary > b) the corrupted byte range is a single memory page and > c) almost every fourth byte is set to 0x44 in the corrupted case > (but the other bytes changed, too) > > To me this looks as if a wrong memory page got written into the > file. > Hmm and do you have any ideas what's the reason for all this? Defect in the nforce chipset? Or even in the CPU (the Opterons do have integrated memory controllers). > >From our testing I can also tell that the data corruption does > *not* appear at all when we are booting the nodes with mem=2G. > However, when we are using all the 4GB the data corruption > shows up - but not everytime and thus not on all nodes. > Sometimes a node runs for ours without any problem. That's why > we are testing on 32 nodes in parallel most of the time. I have > the impression that it has something to do with physical memory > layout of the running processes. > Hmm maybe,.. but I have absolutely no idea ;) > Please also notice that this is a silent data corruption. I.e. > there are no error or warning messages in the kernel log or the > mce log at all. > Yes I can confirm that. > Christoph, I will carefully re-read your entire posting and the > included links on Monday and will also try the memory hole > setting. > And did you get out anything new?
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