Re: [Valgrind-users] Unsupported Clone Flags: 0x800600

[Adam S. <ada...@gm...>]

That's a good point. The application runs fine on its own though. It is
just when run inside Valgrind that there is a problem.

On Wed, Feb 7, 2018 at 3:29 PM, Tom Hughes <to...@co...> wrote:

> If I'm reading that right it is coming from the breakpad exception handler
> which I can well believe is using clone with some odd flag set to do some
> crazy stuff.
>
> Of course if you've got there then the process is already dead anyway so
> I'm not sure how much it matters?
>
> Tom
>
> On 07/02/18 21:25, Adam Scott wrote:
>
>> Even with the patches from that bug the error still occurred.
>>
>> On Wed, Feb 7, 2018 at 3:16 PM, Adam Scott <ada...@gm... <mailto:
>> ada...@gm...>> wrote:
>>
>>     I am using the latest version 3.13. I will pull down that patch and
>>     try it out.
>>
>>     On Wed, Feb 7, 2018 at 3:03 PM, Philippe Waroquiers
>>     <phi...@sk...
>>     <mailto:phi...@sk...>> wrote:
>>
>>         Which version are you using ?
>>         Some improvements to clone handling was done in 3.13 :
>>         * On Linux, clone handling has been improved to honour
>>         CLONE_VFORK that
>>            involves a child stack.  Note however that CLONE_VFORK |
>>         CLONE_VM is handled
>>            like CLONE_VFORK (by removing CLONE_VM), so applications that
>>         depend on
>>            CLONE_VM exact semantics will (still) not work.
>>
>>         Otherwise, I am sure we have still a bunch of clone related bugs
>>         opened. E.g. https://bugs.kde.org/show_bug.cgi?id=183406
>>         <https://bugs.kde.org/show_bug.cgi?id=183406>
>>         and https://bugs.kde.org/show_bug.cgi?id=386427
>>         <https://bugs.kde.org/show_bug.cgi?id=386427> which has
>>         a patch, and might be what you have encountered.
>>
>>         Philippe
>>
>>
>>         On Wed, 2018-02-07 at 14:51 -0600, Adam Scott wrote:
>>          > I'm hoping someone else has seen this issue and is able to
>>         help me. I have search all over the internet for a solution and
>>         haven't been able to find one. I am trying to run Valgrind on
>>         armv7 architecture, and after compiling Valgrind and getting it
>>         onto the target I am able to run Valgrind successfully on 'ls
>>         -l' but when I run Valgrind on my executable it starts and then
>>         always fails after printing out this error:
>>          >
>>          > ==2333== Unsupported clone() flags: 0x800600
>>          > ==2333==
>>          > ==2333== The only supported clone() uses are:
>>          > ==2333==  - via a threads library (LinuxThreads or NPTL)
>>          > ==2333==  - via the implementation of fork or vfork
>>          > ==2333==
>>          > ==2333== Valgrind detected that your program requires
>>          > ==2333== the following unimplemented functionality:
>>          > ==2333==    Valgrind does not support general clone().
>>          > ==2333== This may be because the functionality is hard to
>>         implement,
>>          > ==2333== or because no reasonable program would behave this
>> way,
>>          > ==2333== or because nobody has yet needed it.  In any case,
>>         let us know at
>>          > ==2333== www.valgrind.org <http://www.valgrind.org> and/or
>>         try to work around the problem, if you can.
>>          > ==2333==
>>          > ==2333== Valgrind has to exit now.  Sorry.  Bye!
>>          > ==2333==
>>          >
>>          > sched status:
>>          >   running_tid=9
>>          >
>>          > The thread that has the crash has the following stack:
>>          > Thread 9: status = VgTs_Runnable (lwpid 2354)
>>          > ==2333==    at 0x6C5BCC: sys_clone
>> (linux_syscall_support.h:2666)
>>          > ==2333==    by 0x6C5BCC:
>>         google_breakpad::ExceptionHandler::GenerateDump(google_
>> breakpad::ExceptionHandler::CrashContext*)
>>         (exception_handler.cc:527)
>>          > ==2333==    by 0x6C60C3:
>>         google_breakpad::ExceptionHandler::SignalHandler(int,
>>         siginfo_t*, void*) (exception_handler.cc:368)
>>          > ==2333==    by 0x4CE5ACF: ??? (in /lib/libc-2.22.so
>>         <http://libc-2.22.so>)
>>          >
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>>
>>
>>
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>
> --
> Tom Hughes (to...@co...)
> http://compton.nu/
>