https://bugzilla.kernel.org/show_bug.cgi?id=202419 Bug ID: 202419 Summary: KVM 4.14.94 regression due to "x86,kvm: move qemu/guest FPU switching out to vcpu_run" Product: Virtualization Version: unspecified Kernel Version: 4.14.94 Hardware: x86-64 OS: Linux Tree: Mainline Status: NEW Severity: normal Priority: P1 Component: kvm Assignee: virtualization_kvm@xxxxxxxxxxxxxxxxxxxx Reporter: rm+bko@xxxxxxxxxxx CC: borntraeger@xxxxxxxxxx, riel@xxxxxxxxxxx, rkrcmar@xxxxxxxxxx Regression: Yes Created attachment 280773 --> https://bugzilla.kernel.org/attachment.cgi?id=280773&action=edit dmesg of the crash Hello, I have a VM which works fine on 4.14.93, but started crashing on boot in a very puzzling way on 4.14.94 (dmesg attached) and 4.14.95. Given the latter two have pretty much one KVM-on-x86 related change [1] since 4.14.93, sure enough, rolling back that one makes it work again (on 4.14.95). It is really weird, how would an FPU change affect loading libraries? But I double-checked that there's no mistake and no changes are happening within the guest initrd, libraries and such. Only switching the kernel on the host between with/without that patch, determines whether the VM will boot or not. Any idea what might be going on here? Thanks [1] https://patchwork.kernel.org/patch/10058409/ -- You are receiving this mail because: You are watching the assignee of the bug.
