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). 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. -Waba. ------------------------------------------------------------------------- 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
