KVM: after upgrading the kernel to 5.15.0-75, VM hangs after migration.

compute81 apport

compute37 apport

libvirt version

(nova-libvirt)[root@compute81 /]# dpkg -l | grep libvirt

ii libvirt-clients 6.0.0-0ubuntu8.16 amd64 Programs for the libvirt library
ii libvirt-daemon 6.0.0-0ubuntu8.16 amd64 Virtualization daemon
ii libvirt-daemon-driver-qemu 6.0.0-0ubuntu8.16 amd64 Virtualization daemon QEMU connection driver
ii libvirt-daemon-system 6.0.0-0ubuntu8.16 amd64 Libvirt daemon configuration files
ii libvirt-daemon-system-systemd 6.0.0-0ubuntu8.16 amd64 Libvirt daemon configuration files (systemd)
ii libvirt0:amd64 6.0.0-0ubuntu8.16 amd64 library for interfacing with different virtualization systems

qemu version

(nova-libvirt)[root@compute81 /]# dpkg -l | grep qemu

ii ipxe-qemu 1.0.0+git-20190109.133f4c4-0ubuntu3.2 all PXE boot firmware - ROM images for qemu
ii ipxe-qemu-256k-compat-efi-roms 1.0.0+git-20150424.a25a16d-0ubuntu4 all PXE boot firmware - Compat EFI ROM images for qemu
ii libvirt-daemon-driver-qemu 6.0.0-0ubuntu8.16 amd64 Virtualization daemon QEMU connection driver
ii qemu-block-extra:amd64 1:4.2-3ubuntu6.24 amd64 extra block backend modules for qemu-system and qemu-utils
ii qemu-kvm 1:4.2-3ubuntu6.24 amd64 QEMU Full virtualization on x86 hardware
ii qemu-slof 20191209+dfsg-1 all Slimline Open Firmware -- QEMU PowerPC version
ii qemu-system 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries
ii qemu-system-arm 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (arm)
ii qemu-system-common 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (common files)
ii qemu-system-data 1:4.2-3ubuntu6.24 all QEMU full system emulation (data files)
ii qemu-system-mips 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (mips)
ii qemu-system-misc 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (miscellaneous)
ii qemu-system-ppc 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (ppc)
ii qemu-system-s390x 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (s390x)
ii qemu-system-sparc 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (sparc)
ii qemu-system-x86 1:4.2-3ubuntu6.24 amd64 QEMU full system emulation binaries (x86)

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 2024500

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

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Hello @mloza1, Are you using AMD SEV here by any chance?

Not using SEV. These are flags

EPYC3 Flags:

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 pcid sse4_1 sse4_2 x2apic movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw ibs skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb cat_l3 cdp_l3 invpcid_single hw_pstate ssbd mba ibrs ibpb stibp vmmcall fsgsbase bmi1 avx2 smep bmi2 erms invpcid cqm rdt_a rdseed adx smap clflushopt clwb sha_ni xsaveopt xsavec xgetbv1 xsaves cqm_llc cqm_occup_llc cqm_mbm_total cqm_mbm_local clzero irperf xsaveerptr rdpru wbnoinvd amd_ppin arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold v_vmsave_vmload vgif v_spec_ctrl umip pku ospke vaes vpclmulqdq rdpid overflow_recov succor smca fsrm

EPYC1 flags:

flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush mmx fxsr sse sse2 ht syscall nx mmxext fxsr_opt pdpe1gb rdtscp lm constant_tsc rep_good nopl nonstop_tsc cpuid extd_apicid amd_dcm aperfmperf rapl pni pclmulqdq monitor ssse3 fma cx16 sse4_1 sse4_2 movbe popcnt aes xsave avx f16c rdrand lahf_lm cmp_legacy svm extapic cr8_legacy abm sse4a misalignsse 3dnowprefetch osvw skinit wdt tce topoext perfctr_core perfctr_nb bpext perfctr_llc mwaitx cpb hw_pstate ssbd ibpb vmmcall fsgsbase bmi1 avx2 smep bmi2 rdseed adx smap clflushopt sha_ni xsaveopt xsavec xgetbv1 xsaves clzero irperf xsaveerptr arat npt lbrv svm_lock nrip_save tsc_scale vmcb_clean flushbyasid decodeassists pausefilter pfthreshold avic v_vmsave_vmload vgif overflow_recov succor smca

Thanks @mloza1 - I see well this looks different from the issue I am investigating, but maybe I can still help.

There are 10s of thousands of changes between linux-image-5.15.0-25 and linux-image-5.15.0-67 so it's difficult to know what caused this. I think bisecting the changes is our best bet. Maybe you can try to narrow down which Ubuntu kernel started to fail this use-case? If you can find out which kernel version exactly started to fail that would be helpful.

@kmously - I'll do my test again and get back with results

List of 5.15 kernels available in the repo

root@compute81:~# apt search linux-image-5.15.*-generic

linux-image-5.15.0-25-generic/now 5.15.0-25.25 amd64 [installed,local] <--- everything works

linux-image-5.15.0-33-generic/focal-updates,focal-security,now 5.15.0-33.34~20.04.1 amd64 [installed] <-- VM hangs

linux-image-5.15.0-41-generic/focal-updates,focal-security,now 5.15.0-41.44~20.04.1 amd64 [installed] <-- VM hangs

Here's a diff of the kernel config files

root@compute81:~# diff -Naur /boot/config-5.15.0-25-generic /boot/config-5.15.0-33-generic
--- /boot/config-5.15.0-25-generic 2022-03-30 15:28:11.000000000 +0000
+++ /boot/config-5.15.0-33-generic 2022-05-19 14:04:01.000000000 +0000
@@ -1,23 +1,22 @@
 #
 # Automatically generated file; DO NOT EDIT.
-# Linux/x86 5.15.0-25-generic Kernel Configuration
+# Linux/x86 5.15.0-33-generic Kernel Configuration
 #
-CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 11.2.0-19ubuntu1) 11.2.0"
+CONFIG_CC_VERSION_TEXT="gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0"
 CONFIG_CC_IS_GCC=y
-CONFIG_GCC_VERSION=110200
+CONFIG_GCC_VERSION=90400
 CONFIG_CLANG_VERSION=0
 CONFIG_AS_IS_GNU=y
-CONFIG_AS_VERSION=23800
+CONFIG_AS_VERSION=23400
 CONFIG_LD_IS_BFD=y
-CONFIG_LD_VERSION=23800
+CONFIG_LD_VERSION=23400
 CONFIG_LLD_VERSION=0
 CONFIG_CC_CAN_LINK=y
 CONFIG_CC_CAN_LINK_STATIC=y
 CONFIG_CC_HAS_ASM_GOTO=y
-CONFIG_CC_HAS_ASM_GOTO_OUTPUT=y
 CONFIG_CC_HAS_ASM_INLINE=y
 CONFIG_CC_HAS_NO_PROFILE_FN_ATTR=y
-CONFIG_PAHOLE_VERSION=122
+CONFIG_PAHOLE_VERSION=121
 CONFIG_IRQ_WORK=y
 CONFIG_BUILDTIME_TABLE_SORT=y
 CONFIG_THREAD_INFO_IN_TASK=y
@@ -47,7 +46,7 @@
 CONFIG_KERNEL_ZSTD=y
 CONFIG_DEFAULT_INIT=""
 CONFIG_DEFAULT_HOSTNAME="(none)"
-CONFIG_VERSION_SIGNATURE="Ubuntu 5.15.0-25.25-generic 5.15.30"
+CONFIG_VERSION_SIGNATURE="Ubuntu 5.15.0-33.34~20.04.1-generic 5.15.30"
 CONFIG_SWAP=y
 CONFIG_SYSVIPC=y
 CONFIG_SYSVIPC_SYSCTL=y
@@ -508,6 +507,7 @@
 # CONFIG_LEGACY_VSYSCALL_NONE is not set
 # CONFIG_CMDLINE_BOOL is not set
 CONFIG_MODIFY_LDT_SYSCALL=y
+# CONFIG_STRICT_SIGALTSTACK_SIZE is not set
 CONFIG_HAVE_LIVEPATCH=y
 CONFIG_LIVEPATCH=y
 # end of Processor type and features
@@ -841,6 +841,7 @@
 CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC=y
 CONFIG_ARCH_HAS_ELFCORE_COMPAT=y
 CONFIG_ARCH_HAS_PARANOID_L1D_FLUSH=y
+CONFIG_DYNAMIC_SIGFRAME=y

 #
 # GCOV-based kernel profiling
@@ -10282,7 +10283,25 @@
 CONFIG_EROFS_FS_SECURITY=y
 CONFIG_EROFS_FS_ZIP=y
 CONFIG_VBOXSF_FS=m
-# CONFIG_AUFS_FS is not set
+CONFIG_AUFS_FS=m
+CONFIG_AUFS_BRANCH_MAX_127=y
+# CONFIG_AUFS_BRANCH_MAX_511 is not set
+# CONFIG_AUFS_BRANCH_MAX_1023 is not set
+# CONFIG_AUFS_BRANCH_MAX_32767 is not set
+CONFIG_AUFS_SBILIST=y
+# CONFIG_AUFS_HNOTIFY is not set
+CONFIG_AUFS_EXPORT=y
+CONFIG_AUFS_INO_T_64=y
+CONFIG_AUFS_XATTR=y
+# CONFIG_AUFS_FHSM is not set
+# CONFIG_AUFS_RDU is not set
+CONFIG_AUFS_DIRREN=y
+# CONFIG_AUFS_SHWH is not set
+# CONFIG_AUFS_BR_RAMFS is not set
+# CONFIG_AUFS_BR_FUSE is not set
+CONFIG_AUFS_BR_HFSPLUS=y
+CONFIG_AUFS_BDEV_LOOP=y
+# CONFIG_AUFS_DEBUG is not set
 CONFIG_NETWORK_FILESYSTEMS=y
 CONFIG_NFS_FS=m
 CONFIG_NFS_V2=m
@@ -10428,7 +10447,7 @@
 CONFIG_ENCRYPTED_KEYS=y
 CONFIG_KEY_DH_OPERATIONS=y
 CONFIG_KEY_NOTIFICATIONS=y
-CO...

I installed 5.15.30-051530-generic from https://kernel.ubuntu.com/~kernel-ppa/mainline/ and everything works

To recap:

linux-image-5.15.0-25-generic - everything works
linux-image-5.15.0-33-generic - VM hangs
linux-image-5.15.0-41-generic - VM hangs
5.15.30-051530-generic - everything works

Do you think it's something to do with one of the enabled options in the kernel config for HWE 5.15.0-33-generic and up ?