With 5.4.0-198-generic, running the reproducer causes the reported crash on a DGXA100, leaving the system unresponsive.
After enabling -proposed, upgrading to 5.4.0-200-generic, and rebooting, the reproducer does not cause a crash. $ echo 1 | sudo tee /sys/kernel/tracing/events/wbt/enable $ echo 1 | sudo tee /sys/kernel/tracing/tracing_on $ sudo dd if=/dev/zero of=/dev/nvme3n1 Note, /dev/nvme3n1 is one of the NVMe disks on DGXA100 with native multipathing, as evidenced by the link /sys/class/block/nvme3c3n1 being present: $ readlink /sys/class/block/nvme3c3n1 ../../devices/pci0000:40/0000:40:01.1/0000:41:00.0/0000:42:08.0/0000:50:00.0/0000:51:00.0/0000:52:00.0/nvme/nvme3/nvme3c3n1 ** Tags removed: verification-needed-focal-linux ** Tags added: verification-done-focal-linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2081085 Title: wbt:wbt_* trace event NULL pointer dereference with GENHD_FL_HIDDEN disks To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2081085/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
