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id = 995
title = "Segfault when saving VM snapshot via QEMU monitor on MIPS and MIPSEL"
state = "closed"
created_at = "2022-04-19T15:33:53.632Z"
closed_at = "2022-08-09T02:41:17.200Z"
labels = ["Migration", "target: mips"]
url = "https://gitlab.com/qemu-project/qemu/-/issues/995"
host-os = "Arch Linux"
host-arch = "x86_64"
qemu-version = "7.0.0rc4, commit hash `81c7ed41a1b33031f3e4fe24191a998a492044b8"
guest-os = "Linux (Buildroot)"
guest-arch = "MIPS and MIPSEL"
description = """When entering the QEMU monitor using Ctrl-A then C, and running the savevm QEMU command, the emulator hangs for a while and then exits with a segfault. This occurs on MIPS and MIPSEL system emulators using the same command line arguments. ARM32, aarch64 and x86_64 emulators don't seem to have this problem. I haven't tested it on any other architectures as I don't have kernel or drive images for them. `qemu-img` seems to work fine with the QCOW2 images used for this test, I was able to create and load offline snapshots from them. The images were created from raw EXT2 filesystem images produced by Buildroot, using `qemu-img convert`."""
reproduce = """1. Start the QEMU system emulator for MIPS/MIPSEL with the given command line.
2. Enter the QEMU monitor with Ctrl-A, C.
3. Run `savevm <vm name>`."""
additional = """I tried logging what QEMU was doing with the `-D ./log.txt` command line option, but the produced log file was empty.
If you need me to send you the kernel image files and QCOW2 images used, I would be happy to do so."""
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