This is a note to let you know that I've just added the patch titled
x86/smp: Don't send INIT to non-present and non-booted CPUs
to the 6.5-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
x86-smp-don-t-send-init-to-non-present-and-non-booted-cpus.patch
and it can be found in the queue-6.5 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 3f874c9b2aae8e30463efc1872bea4baa9ed25dc Mon Sep 17 00:00:00 2001
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Date: Wed, 9 Aug 2023 20:52:20 +0200
Subject: x86/smp: Don't send INIT to non-present and non-booted CPUs
From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
commit 3f874c9b2aae8e30463efc1872bea4baa9ed25dc upstream.
Vasant reported that kexec() can hang or reset the machine when it tries to
park CPUs via INIT. This happens when the kernel is using extended APIC,
but the present mask has APIC IDs >= 0x100 enumerated.
As extended APIC can only handle 8 bit of APIC ID sending INIT to APIC ID
0x100 sends INIT to APIC ID 0x0. That's the boot CPU which is special on
x86 and INIT causes the system to hang or resets the machine.
Prevent this by sending INIT only to those CPUs which have been booted
once.
Fixes: 45e34c8af58f ("x86/smp: Put CPUs into INIT on shutdown if possible")
Reported-by: Dheeraj Kumar Srivastava <dheerajkumar.srivastava@xxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Tested-by: Vasant Hegde <vasant.hegde@xxxxxxx>
Link: https://lore.kernel.org/r/87cyzwjbff.ffs@tglx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/smpboot.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1356,7 +1356,7 @@ bool smp_park_other_cpus_in_init(void)
if (this_cpu)
return false;
- for_each_present_cpu(cpu) {
+ for_each_cpu_and(cpu, &cpus_booted_once_mask, cpu_present_mask) {
if (cpu == this_cpu)
continue;
apicid = apic->cpu_present_to_apicid(cpu);
Patches currently in stable-queue which might be from tglx@xxxxxxxxxxxxx are
queue-6.5/x86-smp-don-t-send-init-to-non-present-and-non-booted-cpus.patch
queue-6.5/cpu-hotplug-prevent-self-deadlock-on-cpu-hot-unplug.patch
queue-6.5/tick-rcu-fix-false-positive-softirq-work-is-pending-.patch
