Bug 2128585
| Summary: | VM crash when hot unplug pci serial device during boot | ||||||
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| Product: | Red Hat Enterprise Linux 9 | Reporter: | yalzhang <yalzhang> | ||||
| Component: | qemu-kvm | Assignee: | Amnon Ilan <ailan> | ||||
| qemu-kvm sub component: | PCI | QA Contact: | Chao Yang <chayang> | ||||
| Status: | CLOSED NOTABUG | Docs Contact: | |||||
| Severity: | unspecified | ||||||
| Priority: | unspecified | CC: | coli, dzheng, jinzhao, juzhang, nanliu, virt-maint, zhetang | ||||
| Version: | 9.1 | ||||||
| Target Milestone: | rc | ||||||
| Target Release: | --- | ||||||
| Hardware: | Unspecified | ||||||
| OS: | Unspecified | ||||||
| Whiteboard: | |||||||
| Fixed In Version: | Doc Type: | If docs needed, set a value | |||||
| Doc Text: | Story Points: | --- | |||||
| Clone Of: | Environment: | ||||||
| Last Closed: | 2022-10-24 03:03:57 UTC | Type: | Bug | ||||
| Regression: | --- | Mount Type: | --- | ||||
| Documentation: | --- | CRM: | |||||
| Verified Versions: | Category: | --- | |||||
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |||||
| Cloudforms Team: | --- | Target Upstream Version: | |||||
| Embargoed: | |||||||
| Attachments: |
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Hi,
I can't reproduce the crash issue with qemu-kvm-7.1.0-1.el9.x86_64.
qemu command line:
-device pcie-root-port,id=pcie-root-port-0,multifunction=on,bus=pcie.0,addr=0x1,chassis=1 \
-device pcie-pci-bridge,id=pcie-pci-bridge-0,addr=0x0,bus=pcie-root-port-0 \
-chardev socket,id=channel1,path=/tmp/helloworld1,server=on,wait=off \
-device pci-serial,id=serial0,chardev=channel1,bus=pcie-pci-bridge-0,addr=0x1 \
Would you please help to try the other pci devices to check if you can reproduce this issue?
Thanks a lot!
Best regards
Nana Liu
I have tried rtl8139 interface which is also a pci device, the crash can not be reproduced. qemu command line generated from libvirt for the xml in comment 0 is like this: -device '{"driver":"pcie-root-port","port":23,"chassis":8,"id":"pci.8","bus":"pcie.0","addr":"0x2.0x7"}' \ -device '{"driver":"pcie-pci-bridge","id":"pci.16","bus":"pci.8","addr":"0x0"}' \ -add-fd set=0,fd=23,opaque=serial0-source \ -chardev file,id=charserial0,path=/dev/fdset/0,append=on \ -device '{"driver":"pci-serial","chardev":"charserial0","id":"serial0","bus":"pci.16","addr":"0x1"}' \ (In reply to jingzhao from comment #3) > Hello, yalan > > So can we close it based on comment1 & 2 > > Thanks > Jing I agree. Unpluging a device during boot is not a normal operation since it needs the OS's coorperation. This is a negative scenario. And I can not reproduce it on lastet rhel 9.2. Let me close it. Thank you! |
Created attachment 1913271 [details] The backtrace Description of problem: VM crash when hot unplug pci serial device during boot Version-Release number of selected component (if applicable): libvirt-8.5.0-6.el9.x86_64 qemu-kvm-7.1.0-1.el9.x86_64 How reproducible: 100% Steps to Reproduce: 1. Prepare a vm with file type serial device as below(no other serial or console devices): # virsh dumpxml avocado-vt-vm1 --xpath //serial <serial type="file"> <source path="/var/lib/libvirt/virt-test"/> <target type="pci-serial" port="0"> <model name="pci-serial"/> </target> <address type="pci" domain="0x0000" bus="0x10" slot="0x01" function="0x0"/> </serial> 2. Undefine and define the vm again: # virsh dumpxml avocado-vt-vm1 > avocado-vt-vm1.xml; virsh undefine avocado-vt-vm1 --nvram; virsh define avocado-vt-vm1.xml; (By undefine --nvram, and define again, there will be a reset process when guest start again.) 3. Start the vm, and hot-unplug the file type serial device immediately after start, the vm will crash: # cat /tmp/test.xml <serial type="file"> <source path="/var/lib/libvirt/virt-test"/> <target type="pci-serial" port="0"> <model name="pci-serial"/> </target> </serial> # virsh start avocado-vt-vm1 ; virsh detach-device avocado-vt-vm1 /tmp/test.xml --live; virsh domstate avocado-vt-vm1 ; sleep 10; virsh domstate avocado-vt-vm1 Domain 'avocado-vt-vm1' has been undefined Domain 'avocado-vt-vm1' defined from avocado-vt-vm1.xml Domain 'avocado-vt-vm1' started Device detached successfully running shut off 4. check the coredump list # coredumpctl list TIME PID UID GID SIG COREFILE EXE SIZE Wed 2022-09-21 01:53:18 EDT 45883 107 107 SIGSEGV present /usr/libexec/qemu-kvm 1.6M Actual results: VM crash when hot unplug pci serial device during boot Expected results: VM should not crash Additional info: