Messages in this thread Patch in this message | | | Date | Thu, 17 May 2018 14:36:39 +0200 (CEST) | From | Thomas Gleixner <> | Subject | Re: [bisected] rcu_sched detected stalls - 4.15 or newer kernel with some Xeon skylake CPUs and extended APIC |
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Rick,
On Wed, 16 May 2018, Rick Warner wrote:
> I've attached the dmesg output with the kernel parameter and supplied patch.
Thanks for providing the data. I think I know what's wrong here. Does the patch below fix your problem?
While you test, I go looking for a big brown paperbag.
Thanks,
tglx
8<----------------
--- a/arch/x86/kernel/apic/x2apic_cluster.c +++ b/arch/x86/kernel/apic/x2apic_cluster.c @@ -124,6 +124,7 @@ static void init_x2apic_ldr(void) goto update; } cmsk = cluster_hotplug_mask; + cmsk->clusterid = cluster; cluster_hotplug_mask = NULL; update: this_cpu_write(cluster_masks, cmsk);
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