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+id = 876
+title = "snek-arm fails on s390x with qemu >6.1"
+state = "closed"
+created_at = "2022-02-15T12:57:47.721Z"
+closed_at = "2022-03-01T19:43:10.320Z"
+labels = ["Closed::Fixed", "accel: TCG", "target: arm"]
+url = "https://gitlab.com/qemu-project/qemu/-/issues/876"
+host-os = "Tried Ubuntu 22.04 or Fedora 35 so far"
+host-arch = "s390x"
+qemu-version = "6.2"
+guest-os = "snek elf file"
+guest-arch = "ARM"
+description = """snek is a language inspired by python for embedded. The tests run snek code natively (in this case on s390x) as well as in python3 as well as emulated for arm.
+The latter is what fails...
+
+the Ubuntu testing has spotted this in:
+
+- https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/s/snek/20220211_065108_2144a@/log.gz
+- https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/s/snek/20220212_050524_3b7ee@/log.gz
+- https://autopkgtest.ubuntu.com/results/autopkgtest-jammy/jammy/s390x/s/snek/20220214_080226_46968@/log.gz
+
+In there all work, but one test fails reproducible, that is `test/pass-slice.py`
+
+When eliminating the automation in makefiles and all that it comes down to:
+```
+$ qemu-system-arm -chardev stdio,mux=on,id=stdio0 -serial none -monitor none -semihosting-config enable=on,chardev=stdio0,arg='snek',arg=test/pass-slice.py -machine mps2-an385,accel=tcg -cpu cortex-m3 -kernel /usr/share/snek/snek-qemu-arm-1.7.elf -nographic -bios none
+fail: [::-5] (model 'o' impl '')
+```
+
+To be clear:
+- the test for python3 works on all platforms
+- the test for snek-native works on all platforms
+- the test for snek-arm work on all platforms except s390x
+- with qemu 6.0 this worked, but the more recent qemu 6.2 makes it fail
+- only some subtests of pass-slice.py fail (see below)
+
+I've gone into some details for the snek side of things in [the bug report there](https://github.com/keith-packard/snek/issues/58)."""
+reproduce = """1. get an s390x system
+2. get the snek elf file for arm
+3. run qemu-system-arm as shown above
+
+P.S. I tried this on latest head (building qemu in an F35 container) and it fails there as well, hence I'm listing commit 2d88a3a595 as affected as well.
+We know 6.0 was ok, so likely 6.0->6.1 brought the issue, I have not yet checked if a bisect is feasible for this."""
+additional = "n/a"