HSX-25: code review (round 0) for VMError::report_and_die () dies on bad PC (8015884)

[Zhengyu Gu]

Dan,

Thank you for cleaning up dll_address_to_function_name(). In general, it 
looks good to me.

One possible enhancement, you can decide if should be done under this bug.

os_windows.cpp
   os::address_is_in_vm(address addr)

I think there is simpler way using Windows API "GetModuleHandleEx() with 
GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS.

Thanks,

-Zhengyu




On 6/21/2013 6:44 PM, Daniel D. Daugherty wrote:
> Greetings,
>
> I have have a proposed fix for the following bug:
>
>     8015884 runThese crashed with SIGSEGV, hs_err has an error instead
>             of stacktrace
>     http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=8015884
>     https://jbs.oracle.com/bugs/browse/JDK-8015884
>
> Here are the HSX-25 webrev URLs:
>
> OpenJDK: http://cr.openjdk.java.net/~dcubed/8015884-webrev/0-hsx25/
> Internal: http://javaweb.us.oracle.com/~ddaugher/8015884-webrev/0-hsx25/
>
> Testing:
> -  test/runtime/6888954/vmerrors.sh has been updated to include a
>    test for a bad function pointer
> - vmerrors.sh has been used on MacOS X and Solaris X86 to verify
>   that bad function pointers get better trouble shooting info
> - (running, @ 24 hours and not yet done) JPRT build and test job
> - (TBD) JPRT build and new test only job
> - (TBD) Aurora Adhoc vm.quick batch for all platforms in the following
>   configs: {Client VM, Server VM} x {fastdebug} x {-Xmixed}
>
> Just to be clear: This fix solves the problem of not getting a
> stacktrace when we get a bad PC; it does not solve the underlying
> reason why libpthread sent the VM into the weeds.
>
> Gory details are below. As always, comments, questions and
> suggestions are welome.
>
> Dan
>
>
> Gory Details:
>
> The primary bug fixes are:
>
> - the Dl_info struct should only be used if dladdr() has
>   returned non-zero (no errors) and always check the dladdr()
>   return value
> - the Dl_info.dli_sname and Dl_info.dli_saddr fields should
>   only be used if non-NULL
> - the first two fixes are based on the Solaris dladdr() man page
> - make logic consistent between MacOS X, Linux and Solaris:
>   - offset is only set when a matching symbol is found (and
>     the pointer is non-NULL)
>
> Cleanup bug fixes are:
>
> - add assert()'s to verify os::dll_address_to_function_name() and
>   os::dll_address_to_library_name() contract for 'buf' parameter
>
> - HotSpot style: explicitly check int function return values
>   rather that assume conversion to boolean, e.g.
>
>     if (dladdr(...)) {  =>  if (dladdr(...) != 0) {
>
> - consistently compare Dl_info fields against NULL instead of a mix of
>   '0', NULL and implied boolean
>
> - the Dl_info.dli_fname and Dl_info.dli_fbase fields are only used if
>   non-NULL; this was done for consistency (and paranoia); the Solaris
>   man page does not state whether or not NULL is a permitted value for
>   these fields
>
> Test changes:
> - add case "13" for bad function pointers
> - change VM-side of the test code so that case "12", the
>   os::signal_raise(SIGSEGV) case, does not have to be last;
>   this puts a ShouldNotReachHere() call after the test_num
>   case statement so this test function will always crash
>   the VM in non-product bits
> - change VM-side of the test code to issue an ERROR message
>   when an unexpected test_num value is passed
>