[Bug 200709] QEMU's IDE hard disk device fails to work properly with 4.18 release candidates (regression vs. 4.17 and earlier)

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https://bugzilla.kernel.org/show_bug.cgi?id=200709

Daniel Reichelt (hacking@xxxxxxxxxxxxxx) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |hacking@xxxxxxxxxxxxxx

--- Comment #5 from Daniel Reichelt (hacking@xxxxxxxxxxxxxx) ---
I'm using this kvm command-line:

kvm
-append "root=/dev/sda ro elevator=noop net.ifnames=0 console=ttyS0"
-display none
-drive file=kvmsid32.qcow2,cache=writeback,detect-zeroes=unmap,discard=unmap
-initrd initrd.img
-k de
-kernel vmlinuz
-m $MEM
-monitor unix:/run/myutils/ckvm/3.monitor-socket,server,nowait,nodelay
-name kvmsid32
-net nic,model=e1000
-net tap,ifname=tap3,script=/etc/qemu-ifup-with-mac
-pidfile /run/myutils/ckvm/3.pid
-runas nobody
-serial stdio
-smp 4
-snapshot
-usbdevice tablet
-vnc localhost:53


When using less than 3.5GiB of RAM (-m 3583) the issue doesn't get triggered.
Specifying -m 3584 or more triggers the issue.

git-bisect'ing lead me to
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=21e07dba9fb1179148089d611fc9e6e70d1887c3
- with this reverted, the issue disappears also when I start kvm with -m 3584
or more.

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