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X-MS-Exchange-CrossTenant-Network-Message-Id: 02f8aaaa-4d59-4e66-5003-08ddbf607814 X-MS-Exchange-CrossTenant-AuthSource: DM4PR11MB6020.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 10 Jul 2025 03:18:41.2727 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: hZiChFWdmaSBRSr+/aDdavMx4o+zDYnF+oyiCTFlXBd3wun3TIinnN5dMZoFtroAE+5JQxzgZpsY/lvlvWJGTQ== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MN0PR11MB5987 X-OriginatorOrg: intel.com On 7/10/2025 10:58 AM, kernel test robot wrote: > > > Hello, > > kernel test robot noticed "BUG:using_smp_processor_id()in_preemptible" on: > > commit: 06ddd17521bf11a3e7f59dafdf5c148f29467d2c ("sched/smp: Always define is_percpu_thread() and scheduler_ipi()") > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git sched/core > > [test failed on linux-next/master 835244aba90de290b4b0b1fa92b6734f3ee7b3d9] > > in testcase: boot > > config: x86_64-randconfig-123-20250702 > compiler: gcc-12 > test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > (please refer to attached dmesg/kmsg for entire log/backtrace) > > > +----------------------------------------------------------+------------+------------+ > | | cac5cefbad | 06ddd17521 | > +----------------------------------------------------------+------------+------------+ > | boot_successes | 20 | 0 | > | boot_failures | 0 | 18 | > | BUG:using_smp_processor_id()in_preemptible | 0 | 18 | > | BUG:using__this_cpu_write()in_preemptible[#]code:swapper | 0 | 18 | > | BUG:using__this_cpu_read()in_preemptible | 0 | 18 | > +----------------------------------------------------------+------------+------------+ > > > If you fix the issue in a separate patch/commit (i.e. not just a new version of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot > | Closes: https://lore.kernel.org/oe-lkp/202507100448.6b88d6f1-lkp@intel.com > > > [ 25.232998][ T1] BUG: using smp_processor_id() in preemptible [00000000] code: swapper/0/1 > [ 25.233645][ T1] caller is __kvm_is_vmx_supported (arch/x86/include/asm/cpuid/api.h:74 arch/x86/include/asm/cpuid/api.h:113 arch/x86/kvm/vmx/vmx.c:2789) > [ 25.234128][ T1] CPU: 0 UID: 0 PID: 1 Comm: swapper/0 Not tainted 6.16.0-rc1-00023-g06ddd17521bf #1 PREEMPT(lazy) > [ 25.234931][ T1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.16.2-debian-1.16.2-1 04/01/2014 > [ 25.235357][ T1] Call Trace: > [ 25.235357][ T1] > [ 25.235357][ T1] dump_stack_lvl (lib/dump_stack.c:123 (discriminator 1)) > [ 25.235357][ T1] check_preemption_disabled (arch/x86/include/asm/preempt.h:85 lib/smp_processor_id.c:53) > [ 25.235357][ T1] __kvm_is_vmx_supported (arch/x86/include/asm/cpuid/api.h:74 arch/x86/include/asm/cpuid/api.h:113 arch/x86/kvm/vmx/vmx.c:2789) > [ 25.235357][ T1] ? __cpuid (arch/x86/include/asm/paravirt.h:179) > [ 25.235357][ T1] ? __sanitizer_cov_trace_pc (kernel/kcov.c:217) > [ 25.235357][ T1] ? ftrace_likely_update (arch/x86/include/asm/smap.h:53 kernel/trace/trace_branch.c:223) > [ 25.235357][ T1] ? __sanitizer_cov_trace_pc (kernel/kcov.c:217) > [ 25.235357][ T1] ? ftrace_likely_update (arch/x86/include/asm/smap.h:53 kernel/trace/trace_branch.c:223) > [ 25.235357][ T1] ? __sanitizer_cov_trace_pc (kernel/kcov.c:217) > [ 25.235357][ T1] ? ftrace_likely_update (arch/x86/include/asm/smap.h:53 kernel/trace/trace_branch.c:223) > [ 25.235357][ T1] vmx_init (arch/x86/kvm/vmx/vmx.c:2808 arch/x86/kvm/vmx/vmx.c:8653) > [ 25.235357][ T1] vt_init (arch/x86/kvm/vmx/main.c:1072) > [ 25.235357][ T1] ? pi_init_cpu (arch/x86/kvm/vmx/main.c:1067) > [ 25.235357][ T1] do_one_initcall (init/main.c:1273) > [ 25.235357][ T1] ? trace_initcall_level (init/main.c:1264) > [ 25.235357][ T1] ? __sanitizer_cov_trace_pc (kernel/kcov.c:217) > [ 25.235357][ T1] ? ftrace_likely_update (arch/x86/include/asm/smap.h:53 kernel/trace/trace_branch.c:223) > [ 25.235357][ T1] ? __sanitizer_cov_trace_pc (kernel/kcov.c:217) > [ 25.235357][ T1] ? ftrace_likely_update (arch/x86/include/asm/smap.h:53 kernel/trace/trace_branch.c:223) > [ 25.235357][ T1] do_initcalls (init/main.c:1334 init/main.c:1351) > [ 25.235357][ T1] kernel_init_freeable (init/main.c:1587) > [ 25.235357][ T1] ? rest_init (init/main.c:1465) > [ 25.235357][ T1] kernel_init (init/main.c:1475) > [ 25.235357][ T1] ? rest_init (init/main.c:1465) > [ 25.235357][ T1] ret_from_fork (arch/x86/kernel/process.c:154) > [ 25.235357][ T1] ? rest_init (init/main.c:1465) > [ 25.235357][ T1] ret_from_fork_asm (arch/x86/entry/entry_64.S:255) > [ 25.235357][ T1] > I took a glance at the warning, before this patch, is_percpu_thread() always return true when CONFIG_SMP is not set. After this patch, is_percpu_thread() checks the current task's CPU affinity. So debug_smp_processor_id() -> check_preemption_disabled() -> is_percpu_thread() might not always return true anymore, which caused the warning. Actually the issue is in __kvm_is_vmx_supported(), should we use something like this below: diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 5c5766467a61..9cba7b061892 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -2787,19 +2787,22 @@ static int setup_vmcs_config(struct vmcs_config *vmcs_conf, static bool __kvm_is_vmx_supported(void) { - int cpu = smp_processor_id(); + int cpu = get_cpu(); if (!(cpuid_ecx(1) & feature_bit(VMX))) { pr_err("VMX not supported by CPU %d\n", cpu); + put_cpu(); return false; } if (!this_cpu_has(X86_FEATURE_MSR_IA32_FEAT_CTL) || !this_cpu_has(X86_FEATURE_VMX)) { pr_err("VMX not enabled (by BIOS) in MSR_IA32_FEAT_CTL on CPU %d\n", cpu); + put_cpu(); return false; } + put_cpu(); return true; } thanks, Chenyu