[lldb-dev] just me, or lldb 3.4 is very buggy?

Todd Fiala tfiala at google.com
Fri Jan 31 08:53:35 PST 2014


Very helpful, thanks Andrew.

Jun - seems much more likely this is related to the 32-bit rather than the
Ubuntu 13.10 part.  (I am still building the latest lldb on Ubuntu 13.10
right now, but it is a 64-bit version).

I'll eventually need 32-bit working on Ubuntu if lldb goes into the Android
AOSP tree and if we still use 32-bit host tools, so I'll have a look at
what's up with that.

Any chance you can move to 64 bit in the meantime, Jun?


On Fri, Jan 31, 2014 at 8:46 AM, Andrew MacPherson <andrew.macp at gmail.com>wrote:

> Hi guys,
>
> I notice that Jun is on 32-bit and I can also confirm that I haven't found
> it possible to get lldb working under 32-bit Linux. LLDB can't currently be
> compiled with clang right now due to this issue:
>
> http://llvm.org/bugs/show_bug.cgi?id=18311
>
> And compiling with gcc (4.8.1 in my case) results in this assertion
> failure when trying to debug anything:
>
> http://llvm.org/bugs/show_bug.cgi?id=17802
>
> Hope that helps,
> Andrew
>
>
>
> On Fri, Jan 31, 2014 at 5:30 PM, Todd Fiala <tfiala at google.com> wrote:
>
>> Here's what I'm seeing on Ubuntu 12.04 x86_64 (I'll hop over to Ubuntu
>> 13.10 in a moment to see what it shows), using gcc 4.8.2:
>>
>> Here is my hello.c:
>>
>> #include <stdio.h>
>>
>> int main(int argc, char **argv)
>> {
>>     printf("Hello, world\n");
>>     return 0;
>> }
>>
>> Here is the output from compiling and running lldb:
>>
>> tfiala at tfiala2:~/lldb/samples/hello$ gcc -g -O0 -o hello hello.c
>> tfiala at tfiala2:~/lldb/samples/hello$ ./hello
>> Hello, world
>> # the following is my top of tree build from lldb as of about 12 hours ago
>> tfiala at tfiala2:~/lldb/samples/hello$
>> ~/lldb/svn/lgs/build2/Debug+Asserts/bin/lldb
>> (lldb) target create ./hello
>> Current executable set to './hello' (x86_64).
>> (lldb) b main
>> Breakpoint 1: where = hello`main + 15 at hello.c:5, address =
>> 0x00000000004004df
>> (lldb) r
>> Process 11433 launching
>> Process 11433 stopped
>> * thread #1: tid = 11433, 0x00007faad38206b0, name = 'hello', stop reason
>> = trace
>>     frame #0: 0x00007faad38206b0
>> -> 0x7faad38206b0:  movq   %rsp, %rdi
>>    0x7faad38206b3:  callq  0x7faad3824010
>>    0x7faad38206b8:  movq   %rax, %r12
>>    0x7faad38206bb:  movl   0x2215ff(%rip), %eax
>> (lldb) Process 11433 launched: './hello' (x86_64)
>> Process 11433 stopped
>> * thread #1: tid = 11433, 0x00000000004004df hello`main(argc=1,
>> argv=0x00007fffa93f3ba8) + 15 at hello.c:5, name = 'hello', stop reason =
>> breakpoint 1.1
>>     frame #0: 0x00000000004004df hello`main(argc=1,
>> argv=0x00007fffa93f3ba8) + 15 at hello.c:5
>>    2
>>    3   int main(int argc, char **argv)
>>    4   {
>> -> 5       printf("Hello, world\n");
>>    6       return 0;
>>    7   }
>> (lldb)
>>
>> I'll try it on Ubuntu 13.10 x86_64 next.  That one will be with a stock
>> system + packages for build-essential, libedit-dev, libpython-dev and swig
>> (I think that's it).
>>
>> -Todd
>>
>>
>> On Fri, Jan 31, 2014 at 8:23 AM, Jun Koi <junkoi2004 at gmail.com> wrote:
>>
>>>
>>>
>>>
>>> On Sat, Feb 1, 2014 at 12:19 AM, Todd Fiala <tfiala at google.com> wrote:
>>>
>>>> Hi Jun,
>>>>
>>>> Thanks again for the report.
>>>>
>>>> I'm hopping over to Ubuntu 13.10 and will have a look at this.  It
>>>> would definitely be helpful to know a few things (which I'm going to have
>>>> to guess about here):
>>>> * What compiler are you using?  gcc or clang?
>>>>
>>>
>>> i am using default CC, which is gcc
>>>
>>>
>>>> * What flags did you pass to the compiler when you compiled? Was it a
>>>> debug build? Was it optimized?
>>>>
>>>>
>>> it is also default compiler option. for example, with helloworld.c
>>> program, i simply compiled it with (without Makefile):
>>>
>>>      $ make helloworld
>>>
>>>
>>>
>>>> I'll file a bug if I'm able to cause a seg fault.  Yesterday I had a
>>>> check-in that fixed a seg fault under Linux - not sure if that's something
>>>> you were hitting.
>>>>
>>>>
>>> I'll post what I see.
>>>>
>>>>
>>> awesome, please keep us updating!
>>>
>>> thanks,
>>> Jun
>>>
>>>
>>>
>>>
>>> On Thu, Jan 30, 2014 at 7:00 AM, Jun Koi <junkoi2004 at gmail.com> wrote:
>>>
>>>> hi,
>>>>
>>>> i got lldb 3.5 from llvm.org/apt, and it is a bit better: it no longer
>>>> has issue with libedit, it seems.
>>>>
>>>> however, it crashes all the time. you can easily reproduce it like
>>>> below:
>>>>
>>>> $ lldb-3.5 ./test
>>>> Current executable set to './test' (i386).
>>>> (lldb) b main
>>>> Breakpoint 1: where = test`main, address = 0x0804847d
>>>> (lldb) r
>>>> Segmentation fault (core dumped)
>>>>
>>>>
>>>> "test" can be any program. in my case, it is just a "hello world"
>>>> program, written in C.
>>>>
>>>> again, this is on Ubuntu 13.10 32bit. please try it, and confirm this
>>>> is indeed a bug.
>>>>
>>>> at this current status, lldb is really unusable :-((
>>>>
>>>> thanks.
>>>> Jun
>>>>
>>>>
>>>>
>>>> On Thu, Jan 30, 2014 at 2:06 AM, Todd Fiala <tfiala at google.com> wrote:
>>>>
>>>>> Hi Jun,
>>>>>
>>>>> Could you file a bug here<http://llvm.org/bugs/enter_bug.cgi?product=lldb>and attach your source?  Include how you compile it so we make sure we're
>>>>> all on the same page to reproduce it.  Then we can see what's going on.
>>>>>
>>>>> Thanks for reporting it!
>>>>>
>>>>> Sincerely,
>>>>> Todd Fiala
>>>>>
>>>>>
>>>>> On Wed, Jan 29, 2014 at 6:48 PM, Sylvestre Ledru <sylvestre at debian.org
>>>>> > wrote:
>>>>>
>>>>>> On 29/01/2014 09:42, Greg Clayton wrote:
>>>>>> > You will need to update the installed libedit on your machine.
>>>>>> "libedit" is the line reader program we use to get commands and the default
>>>>>> version on most linux's is quite old and out of date.
>>>>>> >
>>>>>> >
>>>>>> Ubuntu saucy (13.10) has libedit  v3.1-20130712. Not sure it is the
>>>>>> issue here...
>>>>>>
>>>>>> Sylvestre
>>>>>>
>>>>>> _______________________________________________
>>>>>> lldb-dev mailing list
>>>>>> lldb-dev at cs.uiuc.edu
>>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>> --
>>>>>  Todd Fiala | Software Engineer |  tfiala at google.com |  650-943-3180
>>>>>
>>>>> _______________________________________________
>>>>> lldb-dev mailing list
>>>>> lldb-dev at cs.uiuc.edu
>>>>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>>>>
>>>>>
>>>>
>>>
>>>
>>> --
>>> Todd Fiala | Software Engineer |  tfiala at google.com |  650-943-3180
>>>
>>>
>>
>>
>> --
>> Todd Fiala | Software Engineer |  tfiala at google.com |  650-943-3180
>>
>> _______________________________________________
>> lldb-dev mailing list
>> lldb-dev at cs.uiuc.edu
>> http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
>>
>>
>


-- 
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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