Hi again, I know it is prio-low for everyone, but still thanks for your patience! Plenty of other things now finally are out of the way, so I tried to test the current broken'ness of this before starting a SRU.
1. Create a s390x KVM guest, for example via, but not limited to: $ uvt-kvm create --password=ubuntu testguest release=focal arch=s390x label=daily # Note: do so with the various qemu versions that are to be tested. In my example I had Focal: 1:4.2-3ubuntu6.17 Hirsute: 1:5.2+dfsg-9ubuntu3.1 2. In that guest prep the load so kindly outlined in comment #3 (slightly adapted to match) Note you have to run those as root # prereq $ apt install binutils # define probe $ echo "r:bash_readline /usr/bin/bash:0x$(nm -D /usr/bin/bash | awk '/T readline$/ {print $1}')" > /sys/kernel/debug/tracing/uprobe_events # check if the probe is active and enable it $ cat /sys/kernel/debug/tracing/uprobe_events r:uprobes/bash_readline /usr/bin/bash:0x00000000000dd250 $ echo 1 >/sys/kernel/debug/tracing/events/uprobes/bash_readline/enable # Start bash to trigger some traces $ /usr/bin/bash -c 'echo $BASH_VERSION' 5.0.17(1)-release # Check if traces happened $ cat /sys/kernel/debug/tracing/trace root@testguest2:~# cat /sys/kernel/debug/tracing/trace # tracer: nop # # entries-in-buffer/entries-written: 2/2 #P:1 # # _-----=> irqs-off # / _----=> need-resched # | / _---=> hardirq/softirq # || / _--=> preempt-depth # ||| / delay # TASK-PID CPU# |||| TIMESTAMP FUNCTION # | | | |||| | | bash-1653 [000] d... 540.252440: bash_readline: (0x2aa377b590e <- 0x2aa3785d250) bash-1653 [000] d... 555.642396: bash_readline: (0x2aa377b590e <- 0x2aa3785d250) So far this just works, I see the uretprobes happening in the trace. But neither my test bash nor the one that I'm in logged into the guest crashed/stopped in any way. This is true for both tested qemu versions. Is this only affecting emulated s390x? Is there something else I miss to recreate this? -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1929926 Title: [UBUNTU 21.10] qemu: target/s390x: Fix translation exception on illegal instruction To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/1929926/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs