Date: Wed, 18 Mar 2026 16:37:00 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 293907] guest kernel fails to init when vcpus > available cpus set by cpuset Message-ID: <bug-293907-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=293907 Bug ID: 293907 Summary: guest kernel fails to init when vcpus > available cpus set by cpuset Product: Base System Version: 16.0-CURRENT Hardware: Any OS: Any Status: New Severity: Affects Only Me Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: nvass@gmx.com I have a system with 12 cpu cores and a virtual machine with 12 cpu cores. I wanted to temporarily limit the VM to six cpu cores so I created a cpuset with 6 cpu cores. The guest kernel failed to init. It reached "Launching APs: 2 8 6 11 10 9 3 4 7 5 1" and stayed there spinning. Steps to reproduce: # cpuset -g -p $$ pid 74790 mask: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11 pid 74790 domain policy: first-touch mask: 0 # grep cpu /aurora-storage/vms-danae/devel/devel.conf cpu=12 # cpuset -C -l 0-5 -p $$ # cpuset -g -p $$ pid 74790 mask: 0, 1, 2, 3, 4, 5 pid 74790 domain policy: first-touch mask: 0 # vm start devel console output: ---<<BOOT>>--- Copyright (c) 1992-2026 The FreeBSD Project. Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994 The Regents of the University of California. All rights reserved. FreeBSD is a registered trademark of The FreeBSD Foundation. FreeBSD 16.0-CURRENT main-n284539-1d13d938fe6c GENERIC amd64 FreeBSD clang version 19.1.7 (https://github.com/llvm/llvm-project.git llvmorg-19.1.7-0-gcd708029e0b2) WARNING: WITNESS option enabled, expect reduced performance. VT: init without driver. CPU: Intel(R) Xeon(R) CPU X5650 @ 2.67GHz (2666.77-MHz K8-class CPU) Origin="GenuineIntel" Id=0x206c2 Family=0x6 Model=0x2c Stepping=2 Features=0x9f83fbff<FPU,VME,DE,PSE,TSC,MSR,PAE,MCE,CX8,APIC,SEP,MTRR,PGE,MCA,CMOV,PAT,PSE36,MMX,FXSR,SSE,SSE2,SS,HTT,PBE> Features2=0x829e6217<SSE3,PCLMULQDQ,DTES64,DS_CPL,SSSE3,CX16,xTPR,PCID,DCA,SSE4.1,SSE4.2,POPCNT,AESNI,HV> AMD Features=0x2c100800<SYSCALL,NX,Page1GB,RDTSCP,LM> AMD Features2=0x1<LAHF> TSC: P-state invariant Hypervisor: Origin = "bhyve bhyve " real memory = 5372903424 (5124 MB) avail memory = 4109144064 (3918 MB) Event timer "LAPIC" quality 600 ACPI APIC Table: <BHYVE BVAPIC > FreeBSD/SMP: Multiprocessor System Detected: 12 CPUs FreeBSD/SMP: 12 package(s) x 1 core(s) random: unblocking device. ioapic0 <Version 1.1> irqs 0-31 Launching APs: 2 8 6 11 10 9 3 4 7 5 1 Not sure whether this is a host or guest kernel problem... -- You are receiving this mail because: You are the assignee for the bug.home | help
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