Kernel panic on adding vCPU to guest in Linux 6.9-rc2

xiangfeix.ma added an attachment on Kernel.org Bugzilla:

Created attachment 306112
guest error log

Environment:

Host OS: CentOS 9

Host kernel: 6.9.0-rc1

KVM commit: 9bc60f73

Qemu commit: e5c6528d

Guest kernel: 6.9-rc2

Guest commit: 39cd87c4eb2b893354f3b850f916353f2658ae6f

Guest repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git


Bug detail description: 

When hot adding a vCPU to the guest, the guest happens Call Trace and reboot.

Latest successful guest kernel version: 6.8.0-rc7 (commit: 90d35da658da8cff0d4ecbb5113f5fac9d00eb72).


Reproduce steps: 

1. Create guest:

qemu-system-x86_64 -accel kvm -cpu host -smp 4,maxcpus=128 -drive file=/share/xvs/var/tmp-img_vcpu_hot_add_1712412537,if=none,id=virtio-disk0 -device virtio-blk-pci,drive=virtio-disk0,bootindex=0 -m 4096 -monitor pty -daemonize -vnc :16147 -device virtio-net-pci,netdev=nic0,mac=00:c0:82:16:fa:b0 -netdev tap,id=nic0,br=virbr0,helper=/usr/local/libexec/qemu-bridge-helper,vhost=on

2. Add vCPU to guest

echo 'device_add driver=host-x86_64-cpu,socket-id=0,core-id=4,thread-id=0' > /dev/pts/2

cat /dev/pts/2


Error log: 

[   49.782913] Call Trace:
[   49.783039]  <TASK>
[   49.783147]  ? __die+0x24/0x70
[   49.783309]  ? page_fault_oops+0x82/0x150
[   49.783518]  ? kernelmode_fixup_or_oops+0x84/0x110
[   49.783753]  ? exc_page_fault+0xb9/0x160
[   49.783948]  ? asm_exc_page_fault+0x26/0x30
[   49.784144]  ? cpu_update_apic+0x1c/0x70
[   49.784327]  generic_processor_info+0x7e/0x160
[   49.784541]  acpi_register_lapic+0x19/0x80
[   49.784732]  acpi_map_cpu+0x26/0x90
[   49.784896]  acpi_processor_get_info+0x256/0x490
[   49.785344]  acpi_processor_add+0xb9/0x1f0
[   49.785760]  acpi_bus_attach+0x13b/0x220
[   49.786158]  acpi_bus_scan+0x7e/0x1e0
[   49.786548]  acpi_device_hotplug+0x198/0x2b0
[   49.786963]  acpi_hotplug_work_fn+0x1e/0x30
[   49.787363]  process_one_work+0x159/0x370
[   49.787790]  worker_thread+0x302/0x420
[   49.788184]  ? __pfx_worker_thread+0x10/0x10
[   49.788592]  kthread+0xe3/0x120
[   49.788955]  ? __pfx_kthread+0x10/0x10
[   49.789335]  ret_from_fork+0x31/0x50
[   49.789720]  ? __pfx_kthread+0x10/0x10
[   49.790100]  ret_from_fork_asm+0x1b/0x30
[   49.790491]  </TASK>

File: serial_error_guest.log (text/plain)
Size: 98.02 KiB
Link: https://bugzilla.kernel.org/attachment.cgi?id=306112
---
guest error log

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