Hello, It might be good idea to check before final release if the issue reported in this email can be reproduced. $ echo $CC clang $ echo $CFLAGS -O0 -g -ggdb -Wall -Wextra -pedantic -fno-omit-frame-pointer $ echo $LD ld.gold After compiling the version above I always get crash. $ git describe v2.7-rc1-1-g959227c $ ./src/powertop .... Leaving PowerTOPtimates do 21 measurement(s) connected to battery only Segmentation fault (core dumped) It looks like commit 706bc28ff536f4f53fdf6e24178b9e3bac67d53f might have something to do with the issue. (gdb) bt full #0 0x00007f59287ed200 in std::string::compare(std::string const&) const () from /usr/lib/libstdc++.so.6 No symbol table info available. Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: #1 0x000000000041066d in std::operator< <char, std::char_traits<char>, std::allocator<char> > (__lhs=, __rhs=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/basic_string.h:2590 No locals. Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: #2 0x000000000040f681 in std::less<std::string>::operator() (this=0x6c3268 <tab_windows>, __x=, __y=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/stl_function.h:371 No locals. #3 0x0000000000411817 in std::_Rb_tree<std::string, std::pair<std::string const, tab_window*>, std::_Select1st<std::pair<std::string const, tab_window*> >, std::less<std::string>, std::allocator<std::pair<std::string const, tab_window*> > >::_M_lower_bound ( Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: this=0x6c3268 <tab_windows>, __x=0x5828990, __y=0x6c3270 <tab_windows+8>, __k=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/stl_tree.h:1261 No locals. #4 0x00000000004117c1 in std::_Rb_tree<std::string, std::pair<std::string const, tab_window*>, std::_Select1st<std::pair<std::string const, tab_window*> >, std::less<std::string>, std::allocator<std::pair<std::string const, tab_window*> > >::lower_bound ( Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: this=0x6c3268 <tab_windows>, __k=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/stl_tree.h:927 No locals. Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: #5 0x00000000004107ed in std::map<std::string, tab_window*, std::less<std::string>, std::allocator<std::pair<std::string const, tab_window*> > >::lower_bound (this=0x6c3268 <tab_windows>, __x=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/stl_map.h:902 No locals. Python Exception <class 'gdb.error'> There is no member named _M_dataplus.: #6 0x000000000040f0a2 in std::map<std::string, tab_window*, std::less<std::string>, std::allocator<std::pair<std::string const, tab_window*> > >::operator[] (this=0x6c3268 <tab_windows>, __k=) at /usr/bin/../lib64/gcc/x86_64-unknown-linux-gnu/4.9.2/../../../../include/c++/4.9.2/bits/stl_map.h:496 __i = {first = <error reading variable> #7 0x000000000040e03a in close_display () at display.cpp:93 i = 5 #8 0x0000000000416c2e in clean_shutdown () at main.cpp:378 No locals. #9 0x0000000000417477 in main (argc=1, argv=0x7fff77810778) at main.cpp:519 option_index = 0 c = -1 filename = "\210\a\201w\377\177\000\000\b-.)Y\177\000\000\000\000\000\000\000\000\000\000\303Z\355'Y\177\000\000\020\220i\002\000\000\000\000\320\366\200w\377\177\000\000x\a\201w\377\177\000\000e\356\f)Y\177\000\000\350\003\000\000@\000\000\000@B\017\000\000\312\232;/proc/net/psched", '\000' <repeats 2680 times>... workload = '\000' <repeats 4095 times> iterations = 1 auto_tune = 0 -- Sami Kerola http://www.iki.fi/kerolasa/ _______________________________________________ PowerTop mailing list PowerTop(a)lists.01.org https://lists.01.org/mailman/listinfo/powertop

On 20 November 2014 04:13, Alexandra Yates <alexandra.yates(a)linux.intel.com&gt; wrote: > Thank you for sending this bug report. Yes I want to get this workout > before the release. > > I'm trying to reproduce this error but I cant get it to show me the seg > fault. Strange. > Please help me review the steps to compile powertop using clang. I did not do anything special. export CC=clang export CXX=clang++ export CFLAGS='-O0 -g -ggdb -Wall -Wextra -pedantic -fno-omit-frame-pointer' export LD=ld.gold I don't think the gold linker has much to do with the bug, but then again I did not test with the traditional linker so I cannot say it has no effect. cd powertop git checkout master git clean -xdf git reset --hard ./autogen.sh && ./configure && make -j3 sudo ./src/powertop [press esc quit] -> core I am archlinux testing repos user, so all packages are pretty fresh from open source bakers. $ clang --version clang version 3.5.0 (tags/RELEASE_350/final) Target: i386-pc-linux-gnu Thread model: posix Just in case you have systemd 'core dropped' message might not appear after running the command. The easy thing to check is have a look of journal journalctl --boot --output=json-pretty SYSLOG_IDENTIFIER=systemd-coredump The '--boot' option limits the search to the current boot, that is what everyone usually needs. -- Sami Kerola http://www.iki.fi/kerolasa/

On 20 November 2014 19:47, Alexandra Yates <alexandra.yates(a)linux.intel.com&gt; wrote: Hi Alexandra, > Followed all steps, in two platforms still cant reproduce. (Difference) > I'm running Ubuntu. I just reproduced the issue with g++, without CFLAGS, or anything in environment that I could tell would effect to compilation. Backtrace is pretty similar. (gdb) bt full #0 0x000000000040a14e in _M_lower_bound (this=<optimized out>, __k=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>, __y=0x477368 <tab_windows+8>, __x=0x363e930) at /usr/include/c++/4.9.2/bits/stl_tree.h:1260 No locals. #1 lower_bound (__k=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>, this=0x477360 <tab_windows>) at /usr/include/c++/4.9.2/bits/stl_tree.h:927 No locals. #2 lower_bound (__x=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>, this=0x477360 <tab_windows>) at /usr/include/c++/4.9.2/bits/stl_map.h:902 No locals. #3 operator[] (__k=<error reading variable: Cannot access memory at address 0xffffffffffffffe8>, this=0x477360 <tab_windows>) at /usr/include/c++/4.9.2/bits/stl_map.h:496 __i = <optimized out> #4 close_display () at display.cpp:93 i = 5 #5 0x0000000000411e5e in clean_shutdown () at main.cpp:378 No locals. #6 0x0000000000406d6d in main (argc=1, argv=0x7fff51015798) at main.cpp:519 option_index = 0 c = <optimized out> iterations = 1 filename = '\000' <repeats 2928 times>... workload = '\000' <repeats 4095 times> auto_tune = 0 Maybe comparing my config.log with your will give a hint what could be going on. http://ut3.org/~kerolasa/config.log.gz > I will revert the culprit commit. I would appreciate you testing again. I think the line below should be removed as well.

main.cpp: In function 'void clean_shutdown()': main.cpp:378:16: error: 'close_display' was not declared in this scope close_display(); -- Sami Kerola http://www.iki.fi/kerolasa/