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Re: [RFA] gdbserver crash in gdb/gdbserver/thread.c::thread_search_callback

On 12/21/2015 03:15 PM, Joel Brobecker wrote:
> Connecting GDB to a LynxOS-178 GDBserver causes GDBserver to crash:
>     % gdbserver :4444 simple_main
>     Process simple_main created; pid = 19
>     Listening on port 4444
>     Remote debugging from host
>     Segmentation fault (core dumped)
> We saw this crash on LynxOS and also when using GDBserver on Windows.
> The crash happens in thread_search_callback where the function
> calls the_target->thread_stopped (via the thread_stopped macro)
> without verifying whether the callback is NULL or not.
> For the record, the regression was introduced by:
>     commit a67a9faef0e32886c83611cc7a0ba61e91123063
>     Date:   Mon Nov 30 16:05:26 2015 +0000
>     Subject: gdbserver:prepare_access_memory: pick another thread

Whoops, sorry about that.

> gdb/gdbserver/ChangeLog:
>         * target.c (thread_search_callback): Add check that
>         the thread_stopped target callback is not NULL before
>         calling it.
> Does the fix look good to you?
> Tested on both Windows (native gdbserver) and LynxOS using
> AdaCore's gdb-testsuite.


Pedro Alves

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