Waba wrote: > It took me a while, but I figured it out... nearly! > > Everything SIGILLs after the fs-root service is started. Its start > method does several things, but the problematic bit is replacing the > libc with an optimised version (namely, /usr/lib/libc/libc_hwcap1.so.1, > which makes use of the SSE, MMX, CMOV, SEP and FPU instruction sets > according to file(1)). > > All these flags are indeed advertised in the CPUID (isainfo -v: sse2 sse > fxsr mmx cmov sep cx8 tsc fpu)). If the amd_sysc bit had been present, > the hwcap2 version would have been selected by moe(1), I guess (adds > SSE2 support and replaces SEP by AMD_SYSC). >
The guest's cpuid is 100% faked by qemu. > Disabling the libc replacement in /lib/svc/method/fs-root entirely > workarounds the problem. > > Further investigating, I tricked ls(1) into using the optimised libc > through LD_LIBRARY_PATH and obtained a core. mdb(1) told me that the > culprit was hiding at libc`memset+0x74. And finally, dis(1) revealed > that the faulty instruction is "movups (%esp), %xmm0", a SSE feature. > The %xmm0 register is apparently for storage purposes only, as the only > instructions used to access it are movups, movntps and movaps. > > At this point I hope that it makes a lot of sense to you, because I > have no idea why it works fine on Avi's Opteron, etc. > > Let me know if you need any additional debugging. Can you post the host's /proc/cpuinfo? I'll compare it with my opteron. Anyway, good debug job. -- error compiling committee.c: too many arguments to function ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier. Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ kvm-devel mailing list kvm-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/kvm-devel
