Bug 24230 – Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone

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. ---

@ibuclaw created dlang/dmd pull request #15778 "fix Issue 24230 - Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone" fixing this issue: - fix Issue 24230 - Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone https://github.com/dlang/dmd/pull/15778

dlang/dmd pull request #15778 "fix Issue 24230 - Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone" was merged into stable: - a52b48111411b0a88858f44db84cf6f3dfb8a1ca by Iain Buclaw: fix Issue 24230 - Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone https://github.com/dlang/dmd/pull/15778

dlang/dmd pull request #15829 "merge stable" was merged into master: - 505e475b373a40d81635ee1df16cc1818448bb20 by Iain Buclaw: fix Issue 24230 - Infinite loop in core.cpuid.getCpuInfo0B in Solaris/x86 kernel zone https://github.com/dlang/dmd/pull/15829