qemu-ga: segmentation fault on VM shutdown from host

[val-kulkov]

Maintainer: @yousong
Environment: x86_64, generic, OpenWrt SNAPSHOT r27910-1dc86af356
Package version:
qemu-firmware-seabios - 9.1.0-r2
qemu-ga - 9.1.0-r2

Description:
A host-initiated shutdown of a VM with OpenWrt never completes. The kvm process running on the host has to be manually killed for the VM to stop.

qemu-ga running in the foreground on the guest OpenWrt machine produces the following on stdout:

...
1730056540.243011: debug: received EOF
1730056540.343262: debug: read data, count: 109, data: {"arguments":{"id":3042929038},"execute":"guest-sync-delimited"}
{"arguments":{},"execute":"guest-shutdown"}

1730056540.343402: debug: process_event: called
1730056540.343427: debug: processing command
1730056540.343492: debug: sending data, count: 24
1730056540.343639: debug: process_event: called
1730056540.343680: debug: processing command
1730056540.343773: debug: g_unix_open_pipe() called with FD_CLOEXEC; please migrate to using O_CLOEXEC instead
Segmentation fault

I believe the second last line in the output above gives a hint about what might be going wrong.