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+
+Snapshots freeze guest Sabrelite IMX.6 board
+
+Hello,
+
+I'm trying to take and restore  a snapshot with the whole system state of the Sabrelite IMX.6 board running on QEMU with commands savevm/loadvm.
+It seems that I am able to take a snapshot but loading the snapshot fails.
+
+For comparison I checked out snapshots on 32bit ARM Virt with Debian as well as on the Versatilepb board with a bare metal application and it works fine.
+The problem occurs only with that one particular board.
+
+My environment is:
+Ubuntu 18.04
+QEMU 3.0.1 (I see the same issue in QEMU 4.0.0 as well)
+The kernel and device tree used for the board was 5.1.14 version from kernel.org
+
+The file system was build from imx_v6_v7_defconfig config in buildroot as and sd card image.
+
+Problem:
+
+Loading snapshot stops the whole machine and it's impossible to resume it.
+
+Steps to reproduce problem:
+
+1.      I converted the sdcard.img built from the buildroot to qcow2 using command qemu-img convert -f raw -O qcow2 sdcard.img sdcard.qcow2, since the raw doesn't support snapshots.
+
+2.      I start QEMU with a command
+./arm-softmmu/qemu-system-arm -m 512 -M sabrelite -kernel zImage -append "rootfstype=ext4 root=/dev/mmcblk2p2 rw rootwait" -rtc base=localtime,clock=vm -dtb imx6dl-sabresd.dtb -drive file=sdcard.qcow2,index=2,format=qcow2,id=mycard -device sd-card,drive=mycard -nographic -net nic -net user
+
+3.      I run a simple program which print characters to the console in the background and add some files in user directory, to differ from original image.
+
+4.      I switch to QEMU monitor, and type “savevm <name>”.
+When I type “info snapshots”, the snapshot is listed.
+So I assume it was saved correctly.
+
+5.      Then I switch back to Linux console from monitor, remove the added files and stop the background printing process.
+
+6.      I switch back to monitor and I'm trying now to load the snapshot by “loadvm <name>” command. 
+
+That’s where the problem occurs. QEMU stops and I can't switch back from monitor to Linux.
+Typing “cont” doesn’t help.
+It seems like the simulation has freezed. CPU usage on my Laptop machine equals 100% until I exit QEMU.
+
+
+What’s interesting when I exit the QEMU and then start it again the Linux boots and after it reaches the command prompt I can see the files which were removed after saving the snapshot.
+
+It looks like loading the snapshots works for restoring disk space but it fails for restoring the running processes.
+
+Due to the answer on QEMU mailing list (https://lists.nongnu.org/archive/html/qemu-discuss/2019-08/msg00016.html) it is QEMUs bug.
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