Em Mon, Nov 24, 2014 at 11:52:44PM +0100, Andi Kleen escreveu: > > [root@zoo acme]# perf record -a -g -b sleep 2s > > [ perf record: Woken up 7 times to write data ] > > [ perf record: Captured and wrote 3.033 MB perf.data (~132504 samples) ] > > [root@zoo acme]# perf report --stdio --branch-history > > # To display the perf.data header info, please use --header/--header-only > > options. > > # > > BFD: Dwarf Error: Offset (2585882475) greater than or equal to .debug_str > > size (44321517). > > BFD: Dwarf Error: Could not find abbrev number 11800. > > <BIG SNIP> > > BFD: Dwarf Error: Offset (83496016) greater than or equal to .debug_str > > size (44321517). > > BFD: Dwarf Error: Offset (48628447) greater than or equal to .debug_str > > size (44321517). > > (END)Segmentation fault (core dumped) > > [root@zoo acme]# > > > > Will investigate this later today/tomorrow, if nobody finds a fix in the > > meantime. > > I cannot reproduce this. > > For me it looks like you have some binary or debuginfo that your libbfd > doesn't like. --branch-history resolves all addresses as srcline, > so it will actually walk all the line numbers. > > Can you please find out which one it is? Probably can be seen > by just going up a few levels in gdb and dumping the event. > > If you can find the address that explodes you can also try it directly with > addr2line. If that works it's some problem in the perf implementation. > > It is likely that it would need to be fixed in libbfd. > > To work around it we could turn off force resolving the srcline, > but that would make the output much less useful too unfortuantely...
Yeah, you are right: [acme@zoo linux]$ addr2line -e /usr/lib/debug/usr/lib64/firefox/libxul.so.debug 22fefe8 BFD: Dwarf Error: Offset (2585882475) greater than or equal to .debug_str size (44321517). BFD: Dwarf Error: Could not find abbrev number 11800. BFD: Dwarf Error: Offset (493511937) greater than or equal to .debug_str size (44321517). [acme@zoo linux]$ file /usr/lib/debug/usr/lib64/firefox/libxul.so.debug /usr/lib/debug/usr/lib64/firefox/libxul.so.debug: ELF 64-bit LSB shared object, x86-64, version 1 (GNU/Linux), dynamically linked, BuildID[sha1]=ab6f19f13352ca2fbf218d1ff9200ef8e29764b8, not stripped [acme@zoo linux]$ [acme@zoo linux]$ rpm -qf /usr/lib/debug/usr/lib64/firefox/libxul.so.debug firefox-debuginfo-33.1-2.fc20.x86_64 If I ignore just this one file, all works, I'll process your patch while leaving a note in the changelog that this may trigger binutils bugs, and will check if a later version of binutils has the same problem, etc. - Arnaldo -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
