[lldb-dev] 32-bit linux IsWatchpointHit assertion failure due to WriteRegister
Todd Fiala
tfiala at google.com
Sat Mar 1 12:21:47 PST 2014
OK, I'll try both configure build on 13.10 and 12.04, It could be an
artifact of the build, or Ubuntu version, both of which differ here.
On Mar 1, 2014 3:52 AM, "Andrew MacPherson" <andrew.macp at gmail.com> wrote:
> Just to add another data point here I pulled the latest and built on a
> 32-bit Ubuntu 12.04 machine using gcc 4.8.1 and configure/make (not cmake)
> I get the same error as Matthew.
>
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ uname -a
> Linux linodebox 3.12.6-x86-linode55 #2 SMP Tue Jan 14 08:41:36 EST 2014
> i686 i686 i386 GNU/Linux
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ ./lldb --version
> lldb version 3.5 (http://llvm.org/git/lldb revision
> 18f105d6a0ec19261891cae0a70e1d12b0dd77db clang revision
> 30577e6c4f5ba66b8dc832ed9955b1a7475f788a llvm revision
> abad3545bdf7d89ea9b8c8e0ba30edc45c0118bb)
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ cd ../../tools/lldb/
> andrew at linodebox:~/src/llvm/tools/lldb$ git log | head
> commit 18f105d6a0ec19261891cae0a70e1d12b0dd77db
> Author: Jim Ingham <jingham at apple.com>
> Date: Sat Mar 1 00:17:06 2014 +0000
>
> Make sure the exe_ctx passed to ClangUserExpression::Execute has a
> valid thread.
>
> <rdar://problem/15949113>
>
>
> git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@20256191177308-0d34-0410-b5e6-96231b3b80d8
> andrew at linodebox:~/src/llvm/tools/lldb$ cd -
> /home/andrew/src/llvm/Release+Asserts/bin
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ file /usr/bin/python2.7
> /usr/bin/python2.7: ELF 32-bit LSB executable, Intel 80386, version 1
> (SYSV), dynamically linked (uses shared libs), for GNU/Linux 2.6.24,
> BuildID[sha1]=0xf96ecbe97bf2a78f1d3de7be85b849dfdcbb6083, stripped
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ file lldb
> lldb: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV),
> dynamically linked (uses shared libs), for GNU/Linux 2.6.24,
> BuildID[sha1]=0x670a204eb95a63dc2d59f7e16436de19be894446, not stripped
> andrew at linodebox:~/src/llvm/Release+Asserts/bin$ ./lldb /usr/bin/python
> Current executable set to '/usr/bin/python' (i386).
> (lldb) r
> Process 12316 launching
> lldb: RegisterContextPOSIXProcessMonitor_x86.cpp:511: virtual bool
> RegisterContextPOSIXProcessMonitor_x86_64::IsWatchpointHit(uint32_t):
> Assertion `false && "Could not initialize watchpoint registers"' failed.
> Aborted
>
> Hope that helps,
> Andrew
>
>
> On Fri, Feb 28, 2014 at 5:13 PM, Todd Fiala <tfiala at google.com> wrote:
>
>> Hey Matthew,
>>
>> I just did a double check on my Ubuntu 13.10 x86 VM. Here were the
>> results I got, which seem to be different than yours (I've got an x86
>> 32-bit exe debugging fine with an x86 32-bit lldb):
>>
>> tfiala at ub-x86-13:~/lldb/work/build$ uname -a
>> Linux ub-x86-13.10-01 3.11.0-17-generic #31-Ubuntu SMP Mon Feb 3 21:53:31
>> UTC 2014 i686 i686 i686 GNU/Linux
>> tfiala at ub-x86-13:~/lldb/work/build$ pushd ../llvm/tools/lldb
>> ~/lldb/work/llvm/tools/lldb ~/lldb/work/build
>> tfiala at ub-x86-13:~/lldb/work/llvm/tools/lldb$ git log | head
>> commit aa7f071df1e47c4d63b4cab81c5b3a375e4b4a50
>> Author: Ed Maste <emaste at freebsd.org>
>> Date: Fri Feb 28 13:46:51 2014 +0000
>>
>> Fix types to eliminate compiler warnings in FreeBSD host class
>>
>>
>> git-svn-id: https://llvm.org/svn/llvm-project/lldb/*trunk@202498*91177308-0d34-0410-b5e6-96231b3b80d8
>>
>> commit 3ca8916b078d298cc42ed61ffa2739c67daf7987
>> tfiala at ub-x86-13:~/lldb/work/llvm/tools/lldb$ # svn trunk at 202498
>> tfiala at ub-x86-13:~/lldb/work/llvm/tools/lldb$ popd
>> ~/lldb/work/build
>> tfiala at ub-x86-13:~/lldb/work/build$ file ~/play/size_data/main
>> /home/tfiala/play/size_data/main: ELF 32-bit LSB executable, Intel 80386,
>> version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux
>> 2.6.24, BuildID[sha1]=0x1749b467dda063db39d8bf61a26aec8e2f7a062e, not
>> stripped
>> tfiala at ub-x86-13:~/lldb/work/build$ lldb -v
>> lldb: command not found
>> tfiala at ub-x86-13:~/lldb/work/build$ bin/lldb -v
>> lldb version 3.5 (http://llvm.org/git/lldb.git revision
>> aa7f071df1e47c4d63b4cab81c5b3a375e4b4a50)
>> tfiala at ub-x86-13:~/lldb/work/build$ bin/lldb ~/play/size_data/main
>> Current executable set to '/home/tfiala/play/size_data/main' (i386).
>> (lldb) b main.cpp:5
>> Breakpoint 1: where = main`main + 9 at main.cpp:5, address = 0x08048426
>> (lldb) run
>> Process 24270 launching
>> Process 24270 stopped
>> * thread #1: tid = 24270, 0xb775f190, name = 'main', stop reason = trace
>> frame #0: 0xb775f190
>> -> 0xb775f190: movl %esp, %eax
>> 0xb775f192: calll 0xb7762b70
>> 0xb775f197: movl %eax, %edi
>> 0xb775f199: calll 0xb775f180
>> (lldb) Process 24270 launched: '/home/tfiala/play/size_data/main' (i386)
>> Process 24270 stopped
>> * thread #1: tid = 24270, 0x08048426 main`main + 9 at main.cpp:5, name =
>> 'main', stop reason = breakpoint 1.1
>> frame #0: 0x08048426 main`main + 9 at main.cpp:5
>> 2
>> 3 int main()
>> 4 {
>> -> 5 printf("sizeof(long int): %u\n", sizeof(long int));
>> 6 return 0;
>> 7 }
>> (lldb) step
>> Process 24270 stopped
>> * thread #1: tid = 24270, 0xb75e27df
>> libc.so.6`__printf(format=0x080484e0) + 15 at printf.c:33, name = 'main',
>> stop reason = step in
>> frame #0: 0xb75e27df libc.so.6`__printf(format=0x080484e0) + 15 at
>> printf.c:33
>> (lldb) bt
>> * thread #1: tid = 24270, 0xb75e27df
>> libc.so.6`__printf(format=0x080484e0) + 15 at printf.c:33, name = 'main',
>> stop reason = step in
>> * frame #0: 0xb75e27df libc.so.6`__printf(format=0x080484e0) + 15 at
>> printf.c:33
>> frame #1: 0x0804843a main`main + 29 at main.cpp:5
>> (lldb) exit
>> Quitting LLDB will kill one or more processes. Do you really want to
>> proceed: [Y/n] y
>> tfiala at ub-x86-13:~/lldb/work/build$
>>
>> I'm building with gcc 4.8.1 (stock on that machine), with packages:
>> swig
>> libedit-dev
>> python-dev
>> ncurses-dev
>>
>> I happen to be using cmake/ninja to build this. If you're using
>> configure/make, I can try that too to make sure there isn't any difference.
>>
>>
>> On Fri, Feb 28, 2014 at 6:58 AM, Todd Fiala <tfiala at google.com> wrote:
>>
>>> Hey Matthew,
>>>
>>> > Initial investigations suggest that the offset of dr6 is being
>>> calculated incorrectly. The trace says 0x2A8, it should be 0x114.
>>>
>>> That sounds like you are once again seeing an x86_64 register infos
>>> section (using the x86_64 fpu register set) vs. the i386 set IIRC.
>>>
>>> Your host is a 32-bit x86 architecture, right? (The one where you are
>>> running lldb?)
>>>
>>> If you do a svn status or git status, can you double check that you
>>> don't have any local changes? I'll try on a 32-bit host with a clean repo
>>> to make sure I didn't have any cruft on my end confusing the results.
>>>
>>>
>>> On Fri, Feb 28, 2014 at 6:02 AM, Matthew Gardiner <mg11 at csr.com> wrote:
>>>
>>>> Initial investigations suggest that the offset of dr6 is being
>>>> calculated incorrectly. The trace says 0x2A8, it should be 0x114.
>>>>
>>>>
>>>> (lldb) log enable linux ptrace
>>>> (lldb) run
>>>> operation ptrace(PTRACE_SETOPTIONS, 3665, (nil), 0x58, 0)=0 called from
>>>> file /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/
>>>> Process/Linux/ProcessMonitor.cpp line 1456
>>>> Process 3665 launching
>>>>
>>>> operation ptrace(PTRACE_TRACEME, 0, (nil), (nil), 0)=0 called from file
>>>> /home/mg11/src/heracles2/llvm/tools/lldb/source/Plugins/
>>>> Process/Linux/ProcessMonitor.cpp line 1196
>>>> operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EED31
>>>> called from file /home/mg11/src/heracles2/llvm/
>>>> tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
>>>> operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EED31
>>>> called from file /home/mg11/src/heracles2/llvm/
>>>> tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
>>>> operation ptrace(PTRACE_POKEDATA, 3665, 0x8048340, 0x895eedcc, 0)=0
>>>> called from file /home/mg11/src/heracles2/llvm/
>>>> tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 319
>>>> operation ptrace(PTRACE_PEEKDATA, 3665, 0x8048340, (nil), 0)=895EEDCC
>>>> called from file /home/mg11/src/heracles2/llvm/
>>>> tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 245
>>>> MATTG IWH begin
>>>> WriteRegisterValue dr6 tid=3665 offset=2A8 val=FFFFFFFF
>>>> operation ptrace(PTRACE_POKEUSER, 3665, 0x2a8, 0xffffffff, 0)=FFFFFFFF
>>>> called from file /home/mg11/src/heracles2/llvm/
>>>> tools/lldb/source/Plugins/Process/Linux/ProcessMonitor.cpp line 543
>>>>
>>>>
>>>>
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>>>
>>>
>>> --
>>> 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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>>
>
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