Re: [Bug 218949] Kernel panic after upgrading to 6.10-rc2

[Sean Christopherson <seanjc@google.com>]

On Mon, Jun 10, 2024, bugzilla-daemon@kernel.org wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=218949
> 
> --- Comment #2 from Gino Badouri (badouri.g@gmail.com) ---
> Alright, it's not a regression in the kernel but caused by a bios update (I
> guess).
> I get the same on my previous kernel 6.9.0-rc1.

The WARNs are not remotely the same.  The below issue in svm_vcpu_enter_exit()
was resolved in v6.9 final[1].

The lockdep warnings in track_pfn_remap() and remap_pfn_range_notrack() is a
known issue in vfio_pci_mmap_fault(), with an in-progress fix[2] that is destined
for 6.10.

[1] https://lore.kernel.org/all/1d10cd73-2ae7-42d5-a318-2f9facc42bbe@alu.unizg.hr
[2] https://lore.kernel.org/all/20240530045236.1005864-1-alex.williamson@redhat.com

> Both my 6.9.0-rc1 6.10.0-rc2 kernels are vanilla builds from kernel.org
> (unpatched).
> 
> After updating the bios/firmware of my mainboard Asus ROG Zenith II Extreme
> from 1802 to 2102, it always seems to spawn the error:
> 
> [ 1150.380137] ------------[ cut here ]------------
> [ 1150.380141] Unpatched return thunk in use. This should not happen!
> [ 1150.380144] WARNING: CPU: 3 PID: 4849 at arch/x86/kernel/cpu/bugs.c:2935
> __warn_thunk+0x40/0x50

...

> [ 1150.380266] CPU: 3 PID: 4849 Comm: CPU 0/KVM Not tainted 6.9.0-rc1 #1
> [ 1150.380269] Hardware name: ASUS System Product Name/ROG ZENITH II EXTREME,
> BIOS 2102 02/16/2024
> [ 1150.380271] RIP: 0010:__warn_thunk+0x40/0x50

...

> [ 1150.380298] Call Trace:
> [ 1150.380300]  <TASK>
> [ 1150.380344]  warn_thunk_thunk+0x16/0x30
> [ 1150.380351]  svm_vcpu_enter_exit+0x71/0xc0 [kvm_amd]
> [ 1150.380364]  svm_vcpu_run+0x1e7/0x850 [kvm_amd]
> [ 1150.380377]  kvm_arch_vcpu_ioctl_run+0xca3/0x16d0 [kvm]
> [ 1150.380458]  kvm_vcpu_ioctl+0x295/0x800 [kvm]