We may need to rebuild perf after libunwind is rebuilt.

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to libunwind in Ubuntu.
https://bugs.launchpad.net/bugs/1590236

Title:
  perf --call-graph dwarf doesn't record correct call graph

Status in libunwind package in Ubuntu:
  Confirmed
Status in linux package in Ubuntu:
  Confirmed
Status in libunwind source package in Xenial:
  New
Status in linux source package in Xenial:
  New

Bug description:
  1. What you expected to happen
  Profiling program by "perf --call-graph dwarf" shows correct call-graph in 
perf report

  2. What actually happened
  perf report doesn't show correct call graph. Then perf is re-builded from 
source. During building, perf configure detection says stock libunwind's 
debug_frame feature is not enabled. It leads perf can't record program's 
call-graph correctly.

  3. How it is solved on my local machine
    a. get libunwind source by apt-get source libunwind-dev. 
    b. enable CONFIG_DEBUG_FRAME in libunwind configuration: autoreconfig -i && 
./configure --enable-debug-frame
    c. build libunwind and install it to /usr/lib/local
    d. get kernel source by apt-get source linux and compile perf with 
following command:
         CFLAGS=-I/usr/local/include/ LDFLAGS="-lunwind -L/usr/local/lib/" make
    e. perf call-graph works!

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: libunwind-dev (not installed)
  ProcVersionSignature: Ubuntu 4.4.0-22.40-generic 4.4.8
  Uname: Linux 4.4.0-22-generic aarch64
  ApportVersion: 2.20.1-0ubuntu2
  Architecture: arm64
  Date: Wed Jun  8 03:33:05 2016
  JournalErrors:
   Error: command ['journalctl', '-b', '--priority=warning', '--lines=1000'] 
failed with exit code 1: Hint: You are currently not seeing messages from other 
users and the system.
         Users in the 'systemd-journal' group can see all messages. Pass -q to
         turn off this notice.
   No journal files were opened due to insufficient permissions.
  SourcePackage: libunwind
  UpgradeStatus: No upgrade log present (probably fresh install)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/libunwind/+bug/1590236/+subscriptions

-- 
Mailing list: https://launchpad.net/~touch-packages
Post to     : touch-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~touch-packages
More help   : https://help.launchpad.net/ListHelp

Reply via email to