Ubuntu
qemu package

  1. Bug #1929926
  2. Comment #20

Comment 20 for bug 1929926

Revision history for this message
bugproxy (bugproxy) wrote : Comment bridged from LTC Bugzilla

------- Comment From <email address hidden> 2021-12-17 08:24 EDT-------
Hi!

Sorry about the delay. Both 20.04 and 21.04 packages work fine. Here is the sequence I used:

host# docker run -it ubuntu:20.04 bash
docker# apt-get update
docker# apt-get install binutils linux-image-5.11 qemu-system-s390x wget

docker# cd /tmp
docker# lz4 -d </boot/initrd.img-5.11.0-43-generic | cpio -idv
docker# objdump -d bin/sh | grep read@plt
0000000000007080 <read@plt>:

docker# wget http://launchpadlibrarian.net/571593767/qemu-system-s390x_4.2-3ubuntu6.19_s390x.deb
docker# dpkg -i --force-all qemu-system-s390x_4.2-3ubuntu6.19_s390x.deb

docker# qemu-system-s390x -kernel /boot/vmlinuz-5.11.0-43-generic -initrd /boot/initrd.img-5.11.0-43-generic -m 1024 -nographic
vm# mount -t debugfs foo /sys/kernel/debug
vm# echo "r:read_plt /bin/sh:0x7080" >/sys/kernel/debug/tracing/uprobe_events
vm# echo 1 >/sys/kernel/debug/tracing/events/uprobes/read_plt/enable

Fails without the fix, works with it. Same on 21.04.