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+qemu-s390x-softmmu: crash 
+
+Trying to compile and use rust programs on an s390x emulated machine, crash in qemu/target/s390x/translate.c line 3894
+
+Steps to reproduce: 
+on a amd64 PC, installed debian on s390x emulated by qemu, seems to work fine (installed some packages, etc.)
+installed rust cargo (both from rustup and from debian)
+cargo install anything makes *qemu* crash when beginning to compile
+
+Technical details:
+* host: amd64 Linux
+* qemu v4.2.0 (recompiled from git with debug options using configure --target-list=s390x-softmmu --enable-debug) (problem appears also with older versions of qemu from git, with default compilation options, with qemu from debian, etc.)
+* compiled with gcc 9.2
+* command line, relevant part: qemu-system-s390x -snapshot -machine s390-ccw-virtio -cpu max,zpci=on -serial mon:stdio -display none -m 512
+(tested with -smp 4  -m 4096 as well and without snapshotting)
+* command line, less relevant part: -drive file=./debian.qcow2,if=none,id=drive-virtio-disk0,format=qcow2,cache=none    -device virtio-blk-ccw,devno=fe.0.0001,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,scsi=off    -netdev user,id=mynet0,hostfwd=tcp::2223-:22 -device virtio-net-pci,netdev=mynet0 
+* core dump: abort in qemu/target/s390x/translate.c line 3894 ; s->field: op has value 0xEC and op2 has value 0x54
+(more info available if needed)
+
+Tried to patch source to add 0x54 case to no avail. 
+Tried other cpu variants to no avail as well. 
+
+Reporting this in security as well since it also looks very much like a DoS (albeit somewhat minor), feel free to tell me to report the bug somewhere else.
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