Re: MT crashes

It's too bad that there is not more attention paid to the
native multi-threading aspect.  With so much being done over the net these
days, not supporting native threads mostly leaves you in the dust.

Blake McBride



On Thu, May 24, 2018 at 6:50 PM, Don Cohen <
[email protected]> wrote:

>
> I hoped to hear something back from my last post on this subject (Apr 30).
> I don't have a small example, but I think I have a repeatable example.
> It seems that fedora 24 saves a lot of context in addition to the core
> dump, though it wasn't easy to find it all.  One of the files,
> named "exploitable" says:
> Likely crash reason: Jump to an invalid address
> Exploitable rating (0-9 scale): 6
>
> I suppose this is the same info as the fact that the program
> ended with
>  " Segmentation fault (core dumped)
>
> Another, core_backtrace:
> {   "signal": 11
> ,   "executable": "/home/tmp1/ap5-2.49.93+MT%"
> ,   "stacktrace":
>       [ {   "crash_thread": true
>         ,   "frames":
>               [ {   "address": 4854162
>                 ,   "build_id": "76df05a878e27f6ee7cc5ed39793f74585c42684"
>                 ,   "build_id_offset": 659858
>                 ,   "file_name": "/home/tmp1/ap5-2.49.93+MT% (deleted)"
>                 } ]
>         }
>       , {   "frames":
>               [ {   "address": 140191862768419
>                 ,   "build_id": "7e7c0136995d74da5288c3f0a0e53dd72e53d7d4"
>                 ,   "build_id_offset": 1020707
>                 ,   "function_name": "__select"
>                 ,   "file_name": "/lib64/libc.so.6"
>                 }
>               , {   "address": 5385773
>                 ,   "build_id": "76df05a878e27f6ee7cc5ed39793f74585c42684"
>                 ,   "build_id_offset": 1191469
>                 ,   "file_name": "/home/tmp1/ap5-2.49.93+MT% (deleted)"
>                 } ]
>         }
>       , {   "frames":
>               [ {   "address": 140191865756134
>                 ,   "build_id": "a6b759a4fe570ed140d81151888da045a3db488e"
>                 ,   "build_id_offset": 68070
>                 ,   "function_name": "sigwait"
>                 ,   "file_name": "/lib64/libpthread.so.0"
>                 }
>               , {   "address": 4736398
>                 ,   "build_id": "76df05a878e27f6ee7cc5ed39793f74585c42684"
>                 ,   "build_id_offset": 542094
>                 ,   "file_name": "/home/tmp1/ap5-2.49.93+MT% (deleted)"
>                 } ]
>         }
>       , {   "frames":
>               [ {   "address": 140191865753581
>                 ,   "build_id": "a6b759a4fe570ed140d81151888da045a3db488e"
>                 ,   "build_id_offset": 65517
>                 ,   "function_name": "accept"
>                 ,   "file_name": "/lib64/libpthread.so.0"
>                 }
>               , {   "address": 5455784
>                 ,   "build_id": "76df05a878e27f6ee7cc5ed39793f74585c42684"
>                 ,   "build_id_offset": 1261480
>                 ,   "file_name": "/home/tmp1/ap5-2.49.93+MT% (deleted)"
>                 } ]
>         }
>       , {   "frames":
>               [ {   "address": 140191862768419
>                 ,   "build_id": "7e7c0136995d74da5288c3f0a0e53dd72e53d7d4"
>                 ,   "build_id_offset": 1020707
>                 ,   "function_name": "__select"
>                 ,   "file_name": "/lib64/libc.so.6"
>                 }
>               , {   "address": 6292742
>                 ,   "build_id": "76df05a878e27f6ee7cc5ed39793f74585c42684"
>                 ,   "build_id_offset": 2098438
>                 ,   "file_name": "/home/tmp1/ap5-2.49.93+MT% (deleted)"
>                 } ]
>         } ]
> }
>
>
> I'm hoping someone can give me advice on how to look for the problem,
> or better, how to help some else who understands it all better than I
> do to look for the problem.
>
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