This bug was fixed in the package linux - 3.16.0-20.27
---------------
linux (3.16.0-20.27) utopic; urgency=low
[ Tim Gardner ]
* [Config] CONFIG_CXL=m
* Release Tracking Bug
- LP: #1376354
[ Andi Kleen ]
* SAUCE: perf tools: Fix perf record as non root with kptr_restrict == 1
- LP: #1375441
[ Chris J Arges ]
* SAUCE: Revert "sd: don't use scsi_setup_blk_pc_cmnd for flush requests"
- LP: #1375452
[ Ian Munsie ]
* SAUCE: (no-up) powerpc/cell: Move spu_handle_mm_fault() out of cell platform
* SAUCE: (no-up) powerpc/cell: Move data segment faulting code out of cell
platform
* SAUCE: (no-up) powerpc/msi: Improve IRQ bitmap allocator
* SAUCE: (no-up) powerpc/mm: Export mmu_kernel_ssize and mmu_linear_psize
* SAUCE: (no-up) powerpc/powernv: Split out set MSI IRQ chip code
* SAUCE: (no-up) cxl: Add new header for call backs and structs
* SAUCE: (no-up) powerpc/powerpc: Add new PCIe functions for allocating cxl
interrupts
* SAUCE: (no-up) powerpc/mm: Add new hash_page_mm()
* SAUCE: (no-up) powerpc/opal: Add PHB to cxl mode call
* SAUCE: (no-up) powerpc/mm: Add hooks for cxl
* SAUCE: (no-up) cxl: Add base builtin support
* SAUCE: (no-up) cxl: Driver code for powernv PCIe based cards for userspace
access
* SAUCE: (no-up) cxl: Userspace header file.
* SAUCE: (no-up) cxl: Add driver to Kbuild and Makefiles
* SAUCE: (no-up) cxl: Add documentation for userspace APIs
-- Tim Gardner <tim.gard...@canonical.com> Tue, 30 Sep 2014 13:05:27 -0600
** Changed in: linux (Ubuntu Utopic)
Status: Fix Committed => Fix Released
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https://bugs.launchpad.net/bugs/1375441
Title:
'perf record' fails with "Perf session creation failed"
Status in “linux” package in Ubuntu:
Fix Released
Status in “linux” source package in Utopic:
Fix Released
Bug description:
---Problem Description---
When run as normal user, 'perf record ls' fails with:
Perf session creation failed.
The command runs successfully when run as root.
---uname output---
Linux ubuntu 3.16.0-16-generic #22-Ubuntu SMP Wed Sep 17 18:45:43 UTC 2014
ppc64le ppc64le ppc64le GNU/Linux
Machine Type = POWER8E pvr 004b 0201
> Maynard,
>
> Can you check if /proc/sys/kernel/kptr_restrict has 1 in it on your
> system ?
Yes, the value is '1'.
>
> On my system it does have 1 and I can repro. Following seems to
> fix:
> echo 0 > /proc/sys/kernel/kptr_restrict
Yes, changing it to '0' does "fix" it, although that shouldn't be
necessary, as you know. So something is broken.
I am able to repro with 3.17.0-rc4 based mainline perf tool.
I suspect that the change in behavior was introduced unintentionally by
this upstream commit. machine__create_kernel_maps() now calls
machine__get_kernel_start_addr() which checks the kptr_restrict state.
---
commit a93f0e551af9e194db38bfe16001e17a3a1d189a
Author: Simon Que <s...@chromium.org>
Date: Mon Jun 16 11:32:09 2014 -0700
perf symbols: Get kernel start address by symbol name
This is being fixed by a recent upstream commit:
https://lkml.org/lkml/2014/9/27/26
Will Ubuntu pick that fix up automatically ?
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