FYI, we noticed the following commit (built with gcc-7):
commit: 432baf60eee3dcacac94b8781464ab566abf0183 ("KVM: VMX: use kvm_fast_pio_in for handling IN I/O")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
in testcase: kvm-unit-tests
with following parameters:
on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory
caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace):
[31mFAIL[0m emulator (131 tests, 7 unexpected failures, 1 skipped)
[32mPASS[0m eventinj (13 tests)
[32mPASS[0m hypercall (2 tests)
[32mPASS[0m idt_test (4 tests)
[32mPASS[0m memory (8 tests)
Thanks,
Xiaolong