This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- artful' to 'verification-done-artful'. If the problem still exists, change the tag 'verification-needed-artful' to 'verification-failed- artful'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-artful -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1759312 Title: AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10 Status in The Ubuntu-power-systems project: Fix Committed Status in linux package in Ubuntu: Fix Committed Status in linux source package in Artful: Fix Committed Status in linux source package in Bionic: Fix Committed Bug description: == SRU Justification == AT_BASE_PLATFORM in AIXV is not exported to userspace on P9 baremetal machines causing trouble to userspace tools and software that rely on that information, notably operf and opreport (from oprofile 1.2.0+) will refuse to run without that information. This bug is fixed by commit e4b79900222b, which is in linux-next and just landed in mainline, but is not contained in any release as of yet. == Fix == e4b79900222b ("powerpc/64s: Fix NULL AT_BASE_PLATFORM when using DT CPU features") == Regression Potential == Low. Limited to powerpc. == Test Case == A test kernel was built with this patch and tested by the original bug reporter. The bug reporter states the test kernel resolved the bug. ---Problem Description--- AT_BASE_PLATFORM in AUXV is absent on kernels available on Ubuntu 17.10 ---Additional Hardware Info--- Architecture: ppc64le Byte Order: Little Endian CPU(s): 176 On-line CPU(s) list: 0-175 Thread(s) per core: 4 Core(s) per socket: 22 Socket(s): 2 NUMA node(s): 8 Model: 2.2 (pvr 004e 1202) Model name: POWER9, altivec supported CPU max MHz: 2800.0000 CPU min MHz: 2300.0000 L1d cache: 32K L1i cache: 32K L2 cache: 512K L3 cache: 10240K NUMA node0 CPU(s): 0-87 NUMA node8 CPU(s): 88-175 NUMA node250 CPU(s): NUMA node251 CPU(s): NUMA node252 CPU(s): NUMA node253 CPU(s): NUMA node254 CPU(s): NUMA node255 CPU(s): Machine Type = P9, DD2.2, Witherspoon, baremetal ---Steps to Reproduce--- AT_BASE_PLATFORM in AIXV is not exported to userspace on P9 baremetal machines causing trouble to userspace tools and software that relie on that information, notably operf and opreport (from oprofile 1.2.0+) will refuse to run without that information show a error message like: gromero@ltc-wspoon3:/boot$ operf NULL returned for one or both of AT_PLATFORM/AT_BASE_PLATFORM AT_PLATFORM: power9; AT_BASE_PLATFORM: (null) Unable to obtain cpu_type Verify that a pre-1.0 version of OProfile is not in use. If the /dev/oprofile/cpu_type file exists, locate the pre-1.0 OProfile installation, and use its 'opcontrol' command, passing the --deinit option. Unable to ascertain cpu type. Exiting. ---uname output--- linux-image-4.13.0-36-generic 4.13.0-36.40 Userspace tool common name: operf, opreport Dear maintainer. please consider applying the following fix that's already available upstream: https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id=e4b79900222b8cccd4da4a7a89581f Thank you. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-power-systems/+bug/1759312/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
