[Bug 197951] QEMU/KVM & VFIO & PCI passthru with Windows 10 x64 guest: memory access intermittently causes CRITICAL_STRUCTURE_CORRUPTION BSOD unless swap is disabled on host, since 4.12.13

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=197951

--- Comment #6 from Ladi Prosek (lprosek@redhat.com) ---
I have seen this crash on a Windows 10 x64 guest *without* any kind of device
assignment. Didn't keep track of exact kernel versions but it was Fedora 26,
very likely 4.12.*.

If you've been able to build a kernel where this happens for you, try
cherry-picking:

commit a2b7861bb33b2538420bb5d8554153484d3f961f                       
Author: Boqun Feng <boqun.feng@gmail.com>                             
Date:   Tue Oct 3 21:36:51 2017 +0800                                 

    kvm/x86: Avoid async PF preempting the kernel incorrectly         

    Currently, in PREEMPT_COUNT=n kernel, kvm_async_pf_task_wait() could call
    schedule() to reschedule in some cases.  This could result in     
    accidentally ending the current RCU read-side critical section early,    
    causing random memory corruption in the guest, or otherwise preempting   
    the currently running task inside between preempt_disable and     
    preempt_enable.                


Keywords: "PF" (since the report mentions swap), "random memory corruption in
the guest"

-- 
You are receiving this mail because:
You are watching the assignee of the bug.