https://issues.dlang.org/show_bug.cgi?id=24230
Issue ID: 24230 Summary: Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone Product: D Version: D2 Hardware: x86_64 OS: Solaris Status: NEW Severity: critical Priority: P1 Component: druntime Assignee: nob...@puremagic.com Reporter: ibuc...@gdcproject.org Any program that pulls in core.cpuid results in an infinite loop when running inside a Solaris kernel zone. https://github.com/dlang/dmd/blob/d24a8859b090911a2a48cbbd7666ff7e448acfc8/druntime/src/core/cpuid.d#L672-L696 Quote from https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112408 --- Running getCpuInfo0B side-by-side in the kernel zone and on bare metal shows: kernel zone bare metal level 0 a 0 1 b 1 2 level 1 a 0 5 b 1 28 level 2 a 0 0 b 1 0 and so on for each higher level. So inside a kernel zone, a!=0 || b!=0 remains true, explaining the loop. If I'm reading the spec (Intel® 64 and IA-32 Architectures Software Developer’s Manual, Combined Volumes: 1, 2A, 2B, 2C, 2D, 3A, 3B, 3C, 3D, and 4, Order Number: 325462-081US, September 2023, Vol. 2A, 3-225, p.821) correctly, this is a bug in the kernel zone software: A sub-leaf returning an invalid domain always returns 0 in EAX and EBX. OTOH I don't see why getCpuInfo0B needs to loop here since it's only interested in levels 0 and 1 anyway. --- --