Aurelien Jarno wrote: > Hi all, > > For a long time I am seeing data corruption in guests when using KVM, > but I am convinced only since today that the problem comes from KVM. > > The symptoms are a few bytes that are mangled to 0x00 in a file that has > been written. For now I have only seen 2 or 4 consecutive bytes mangled, > but that may due to statistics given the limited samples. > > The problem appears very rarely. I am only seeing it when doing huge > compilations (for example gcc or glibc), and not for every build. Note > that I am only detecting build failures, so I can miss some corruptions. > > Note that I have observed the problem on GNU/Linux, GNU/kFreeBSD and > plain FreeBSD, for both 32 and 64-bit guests. I always used 64-bit > hosts, and I have seen the problem on both Core 2 and Athlon 64 CPU > (always multi-core). > > I have never seen such corruptions using QEMU, so I would say the > problem does not comes from the disk emulation, though it may be due to > statistics. Note that I have made a lot of compilation in a MIPS QEMU > guest (a few hundred of hours), without any problem. This platform uses > the same IDE controller as the one in KVM. > > Does anybody have seen the same kind of problem? Without a way to > reproduce the corruption, I think it will be very difficult to debug > the problem.
Did you observe anything about the corruption? For example, are the offsets at page boundary? Can you provide a corrupted file and the same, non-corrupted file as a reference? For the 32-bit case, were the guests pae, nonpae, or both? How would I go about reproducing this? Is a single ./configure; make clean; make in a loop compiling gcc sufficient? -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
