Follow up for comment #20, this was caused by an out-dated host. Issue has gone after updating the host to 4.15.0-136 Thanks!
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1872401 Title: vmx_nm_test in ubuntu_kvm_unit_tests interrupted on X-oracle-4.15 / B-oracle-4.15 / X-KVM / B-KVM Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: Invalid Status in linux source package in Xenial: New Status in linux source package in Bionic: Fix Released Bug description: [Impact] When running kvm-unit-tests under a guest, it will be paused, requiring a reset. When running the same test on a host (vmx_nm_test), it will fail. [Test case] Grab kvm-unit-tests, build it and run: TESTNAME=vmx TIMEOUT=90s ACCEL= ./x86/run x86/vmx.flat -smp 1 -cpu host,+vmx -append "vmx_nm_test" If done inside a guest, when the host runs the bionic 4.15 kernel, the guest will pause. [Potential regressions] Nested KVM could stop working. Floating point could stop working on KVM guests, though the code that relied on this was already removed from Bionic. ------------------------------ This issue was first spotted on Mar.16 [1] The ubuntu_kvm_unit_tests will be interrupted on X-oracle-4.15 on both VM.Standard2.1 and VM.Standard2.16, this is not a regression since it can be reproduced with 4.15.0-1031-oracle #34~16.04.1: Running '/home/ubuntu/autotest/client/tmp/ubuntu_kvm_unit_tests/src/kvm-unit-tests/tests/vmx_nm_test' BUILD_HEAD=4671e4ba timeout -k 1s --foreground 30 /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.da3iFrsCzC -smp 1 -cpu host,+vmx -append vmx_nm_test # -initrd /tmp/tmp.h2DFw8L0AF enabling apic paging enabled cr0 = 80010011 cr3 = 477000 cr4 = 20 Test suite: vmx_nm_test client_loop: send disconnect: Broken pipe (node disconnected here) Before the test started, this can be found in syslog: Apr 13 06:26:25 selfprovisioned-phlin-kvm-unit kernel: [ 1073.529005] L1TF CPU bug present and SMT on, data leak possible. See CVE-2018-3646 and https://www.kernel.org/doc/html/latest/admin-guide/hw-vuln/l1tf.html for details. After that, noting was printed and node disconnected. If you try to run this case manually, it will stop at: # ./vmx_nm_test BUILD_HEAD=4671e4ba ready!!! timeout -k 1s --foreground 30 /usr/bin/qemu-system-x86_64 -nodefaults -device pc-testdev -device isa-debug-exit,iobase=0xf4,iosize=0x4 -vnc none -serial stdio -device pci-testdev -machine accel=kvm -kernel /tmp/tmp.ZcGrnXu6se -smp 1 -cpu host,+vmx -append vmx_nm_test # -initrd /tmp/tmp.ADjEOAcRKM enabling ap (stopped here, even the "enabling apic" string was not printed) It looks like this is a new test case added since the cycle of 4.15.0-1037.41~16.04.1-oracle [1] https://bugs.launchpad.net/ubuntu-kernel- tests/+bug/1867623/comments/2 ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.15.0-1031-oracle 4.15.0-1031.34~16.04.1 ProcVersionSignature: User Name 4.15.0-1031.34~16.04.1-oracle 4.15.18 Uname: Linux 4.15.0-1031-oracle x86_64 ApportVersion: 2.20.1-0ubuntu2.21 Architecture: amd64 Date: Mon Apr 13 05:18:03 2020 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-signed-oracle UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1872401/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
