[Bug 1824880] Re: powertop crashed with sigsegv in tunables_sort

[Sebastien Bacher]

Thank you for your bug report. Do you have specific steps to trigger the issue?
Ideally it should be reported upstream on https://us-bz3.devzing.com/powertopbugs/

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Title:
  powertop crashed with sigsegv in tunables_sort

Status in powertop package in Ubuntu:
  New

Bug description:
  $ sudo gdb --args powertop -c
  ...
  Thread 1 "powertop" received signal SIGSEGV, Segmentation fault.
                                                                  tunables_sort (i=0x555555bfb590, j=0x211) at tuning/tuning.cpp:169
  169	tuning/tuning.cpp: No such file or directory.
  (gdb) bt
  #0  tunables_sort (i=0x555555bfb590, j=0x211) at tuning/tuning.cpp:169
  #1  0x00005555555aa08a in __gnu_cxx::__ops::_Val_comp_iter<bool (*)(tunable*, tunable*)>::operator()<tunable*, __gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > > > (__val=<synthetic pointer>: <optimized out>, __it=..., this=<synthetic pointer>)
      at /usr/include/c++/7/bits/predefined_ops.h:215
  #2  std::__unguarded_linear_insert<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Val_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=0x555556fe2c80) at /usr/include/c++/7/bits/stl_algo.h:1828
  #3  std::__unguarded_insertion_sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/7/bits/stl_algo.h:1867
  #4  std::__final_insertion_sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=..., __first=...) at /usr/include/c++/7/bits/stl_algo.h:1886
  #5  std::__sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, __gnu_cxx::__ops::_Iter_comp_iter<bool (*)(tunable*, tunable*)> > (__comp=..., __last=0x555555804a90, __first=...) at /usr/include/c++/7/bits/stl_algo.h:1971
  #6  std::sort<__gnu_cxx::__normal_iterator<tunable**, std::vector<tunable*, std::allocator<tunable*> > >, bool (*)(tunable*, tunable*)> (
      __comp=0x5555555a95e0 <tunables_sort(tunable*, tunable*)>, __last=0x555555804a90, __first=...) at /usr/include/c++/7/bits/stl_algo.h:4868
  #7  sort_tunables () at tuning/tuning.cpp:195
  #8  0x00005555555aa18c in init_tuning () at tuning/tuning.cpp:74
  #9  0x00005555555aa321 in initialize_tuning () at tuning/tuning.cpp:84
  #10 0x000055555556365b in main (argc=2, argv=0x7fffffffe668) at main.cpp:536


  This happens sometime after calibration of backlight, CPU, CPU wakeup,
  USB, and rfkill. Hardware is Thinkpad x201t.

  ProblemType: Bug
  DistroRelease: Ubuntu 19.04
  Package: powertop 2.9-0ubuntu2
  ProcVersionSignature: Ubuntu 5.0.0-11.12-generic 5.0.6
  Uname: Linux 5.0.0-11-generic x86_64
  ApportVersion: 2.20.10-0ubuntu27
  Architecture: amd64
  CurrentDesktop: ubuntu:GNOME
  Date: Mon Apr 15 15:58:18 2019
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-03-11 (1130 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: powertop
  UpgradeStatus: Upgraded to disco on 2019-04-03 (12 days ago)

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