[lldb-dev] just me, or lldb 3.4 is very buggy?
Jun Koi
junkoi2004 at gmail.com
Fri Jan 31 22:37:20 PST 2014
i tried llvm-3.4 on Ubuntu 13.10-64bit, and have this issue:
- immediately after lldb shows the prompt (lldb), i entered "b main"
- then to see the list of breakpoints, i entered "br l". this command shows
1 breakpoint (this is expected), but doesnt return to the prompt after that.
i installed lldb-3.5 from llvm.org/apt/, and this problem was fixed.
is there any chance to have lldb-3.5 with upcoming Ubuntu 14.04 to replace
lldb-3.4, which is so buggy that it is unusable even for basic usage?
thanks,
Jun
On Sat, Feb 1, 2014 at 2:33 AM, Todd Fiala <tfiala at google.com> wrote:
> Just for posterity's sake, I did run the hello world test on Ubuntu 13.10
> (x86_64 - so not 32-bit), top of tree lldb, and it did work. I know this
> isn't the 32-bit case, I just wanted to show it working on Ubuntu 13.10 in
> 64-bit mode. Same hello.c as before, this time with gcc 4.8.1 as
> distributed with Ubuntu 13.10:
>
> # create a.out
> tfiala at ubuntu:~/work/samples/hello$ gcc -g -O0 hello.c
> # run my top of tree lldb that I just built from lldb as of svn r200548.
> tfiala at ubuntu:~/work/samples/hello$
> ~/work/lgs/build/Debug+Asserts/bin/lldb
> (lldb) target create a.out
> Current executable set to 'a.out' (x86_64).
> (lldb) b main
> Breakpoint 1: where = a.out`main + 15 at hello.c:5, address =
> 0x000000000040053c
> (lldb) run
> Process 11621 launching
> Process 11621 stopped
> * thread #1: tid = 11621, 0x00007f428f3a7630, name = 'a.out', stop reason
> = trace
> frame #0: 0x00007f428f3a7630
> -> 0x7f428f3a7630: movq %rsp, %rdi
> 0x7f428f3a7633: callq 0x7f428f3aafa0
> 0x7f428f3a7638: movq %rax, %r12
> 0x7f428f3a763b: movl 0x2216ef(%rip), %eax
> (lldb) Process 11621 launched: '/home/tfiala/work/samples/hello/a.out'
> (x86_64)
> Process 11621 stopped
> (lldb) * thread #1: tid = 11621, 0x000000000040053c a.out`main(argc=1,
> argv=0x00007fff68b12a38) + 15 at hello.c:5, name = 'a.out', stop reason =
> breakpoint 1.1
> frame #0: 0x000000000040053c a.out`main(argc=1,
> argv=0x00007fff68b12a38) + 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 did assign myself the 32-bit Ubuntu 13.10 issue for gcc-built lldb.
> I'll have a look at that:
> http://llvm.org/bugs/show_bug.cgi?id=17802
>
>
> On Fri, Jan 31, 2014 at 8:56 AM, Jun Koi <junkoi2004 at gmail.com> wrote:
>
>>
>>
>>
>> On Sat, Feb 1, 2014 at 12:53 AM, Todd Fiala <tfiala at google.com> wrote:
>>
>>> 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?
>>>
>>
>> yes i can if there is no alternative, but i would not want to do that if
>> 32bit works for me.
>>
>> so please support 32bit lldb, as it is still the main environment for
>> lots of people.
>>
>>
>> thanks,
>> 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
>>>
>>
>>
>
>
> --
> Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
>
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